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802.0203
Hooman Davoudiasl
Hooman Davoudiasl, Gilad Perez, and Amarjit Soni
The Little Randall-Sundrum Model at the Large Hadron Collider
Revtex4, 6 pages, two tables. Typos in the text and reference list corrected
Phys.Lett.B665:67-71,2008
10.1016/j.physletb.2008.05.024
BNL-HET-08/3, YITP-SB-08-43
hep-ph hep-ex hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a predictive warped model of flavor that is cut off at an ultraviolet scale O(10^3) TeV. This "Little Randall-Sundrum (LRS)" model is a volume-truncation, by a factor $y \approx 6$, of the RS scenario and is holographically dual to dynamics with number of colors larger by $y$. The LRS couplings between Kaluza-Klein states and the Standard Model fields, including the proton constituents, are explicitly calculable without ad hoc assumptions. Assuming separate gauge and flavor dynamics, a number of unwanted contributions to precision electroweak, $Z b\bar b$ and flavor observables are suppressed in the LRS framework, compared with the corresponding RS case. An important consequence of the LRS truncation, independent of precise details, is a significant enhancement of the clean (golden) di-lepton LHC signals, by O(y^3), due to a larger "$\rho$-photon" mixing and a smaller inter-composite coupling.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 16:36:58 GMT" }, { "version": "v2", "created": "Wed, 2 Apr 2008 21:52:33 GMT" }, { "version": "v3", "created": "Mon, 16 Jun 2008 18:18:22 GMT" } ]
2008-11-26T00:00:00
[ [ "Davoudiasl", "Hooman", "" ], [ "Perez", "Gilad", "" ], [ "Soni", "Amarjit", "" ] ]
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802.0204
Alexander Getling
P.N. Brandt and A.V. Getling
Do Long-Lived Features Really Exist in the Solar Photosphere? II. Contrast of Time-Averaged Granulation Images
Accepted by Solar Physics
Solar Physics, v. 249, no. 2, pp. 307--314, 2008
10.1007/s11207-008-9146-3
null
astro-ph
null
The decrease in the rms contrast of time-averaged images with the averaging time is compared between four datasets: (1) a series of solar granulation images recorded at La Palma in 1993; (2) a series of artificial granulation images obtained in numerical simulations by Rieutord et al. (2002); (3) a similar series computed by Steffen and his colleagues (see Wedemeyer et al., 2004}); (4) a random field with some parameters typical of the granulation, constructed by Rast (2002). In addition, (5) a sequence of images was obtained from real granulation images using a temporal and spatial shuffling procedure, and the contrast of the average of n images from this sequence as a function of n is analysed. The series (1) of real granulation images exhibits a considerably slower contrast decrease than do both the series (3) of simulated granulation images and the series (4) of random fields. Starting from some relatively short averaging times t, the behaviour of the contrast in series (3) and (4) resembles the t^{-1/2} statistical law, while the shuffled series (5) obeys the n^{-1/2} law from n = 2 on. Series (2) demonstrates a peculiarly slow decline of contrast, which could be attributed to particular properties of the boundary conditions used in the simulations. Comparisons between the analysed contrast-variation laws indicate quite definitely that the brightness field of solar granulation contains a long-lived component, which could be associated with locally persistent dark intergranular holes and/or with the presence of quasi-regular structures. The suggestion that the random field (4) successfully reproduces the contrast-variation law for the real granulation (Rast, 2002) can be declined.
[ { "version": "v1", "created": "Fri, 1 Feb 2008 21:08:01 GMT" } ]
2008-05-20T00:00:00
[ [ "Brandt", "P. N.", "" ], [ "Getling", "A. V.", "" ] ]
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802.0205
Wolmer Vasconcelos
Wolmer V. Vasconcelos
The Chern coefficients of local rings
17 pages
Michigan J. Math. 57 (2008), 725-744
null
null
math.AC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The Chern numbers of the title are the first coefficients (after the multiplicities) of the Hilbert functions of various filtrations of ideals of a local ring $(R, \mathfrak{m})$. For a Noetherian (good) filtration $\mathcal{A}$ of $\mathfrak{m}$-primary ideals, the positivity and bounds for $e_1(\mathcal{A})$ are well-studied if $R$ is Cohen-Macaulay, or more broadly, if $R$ is a Buchsbaum ring or mild generalizations thereof. For arbitrary geometric local domains, we introduce techniques based on the theory of maximal Cohen-Macaulay modules and of extended multiplicity functions to establish the meaning of the positivity of $e_1(\mathcal{A})$, and to derive lower and upper bounds for $e_1(\mathcal{A})$.
[ { "version": "v1", "created": "Fri, 1 Feb 2008 21:14:49 GMT" }, { "version": "v2", "created": "Sat, 19 May 2012 23:56:06 GMT" } ]
2012-05-22T00:00:00
[ [ "Vasconcelos", "Wolmer V.", "" ] ]
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802.0206
Patrick Slane
P. Slane, D. J. Helfand, S. P. Reynolds, B. M. Gaensler, A. Lemiere, and Z. Wang
The Infrared Detection of the Pulsar Wind Nebula in the Galactic Supernova Remnant 3C 58
4 pages, 4 figures, accepted for publication in ApJ Letters
null
10.1086/587031
null
astro-ph
null
We present infrared observations of 3C 58 with the Spitzer Space Telescope and the Canada-France-Hawaii Telescope. Using the IRAC camera, we have imaged the entire source resulting in clear detections of the nebula at 3.6 and 4.5 microns. The derived flux values are consistent with extrapolation of the X-ray spectrum to the infrared band, demonstrating that any cooling break in the synchrotron spectrum must occur near the soft X-ray band. We also detect the torus surrounding PSR J0205+6449, the 65 ms pulsar that powers 3C 58. The torus spectrum requires a break between the infrared and X-ray bands, and perhaps multiple breaks. This complex spectrum, which is an imprint of the particles injected into the nebula, has considerable consequences for the evolution of the broadband spectrum of 3C 58. We illustrate these effects and discuss the impact of these observations on the modeling of broadband spectra of pulsar wind nebulae.
[ { "version": "v1", "created": "Fri, 1 Feb 2008 21:59:42 GMT" } ]
2009-11-13T00:00:00
[ [ "Slane", "P.", "" ], [ "Helfand", "D. J.", "" ], [ "Reynolds", "S. P.", "" ], [ "Gaensler", "B. M.", "" ], [ "Lemiere", "A.", "" ], [ "Wang", "Z.", "" ] ]
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802.0207
Jarrett Johnson
Jarrett L. Johnson, Thomas H. Greif, Volker Bromm
The First Stars
12 pages, 9 figures, proceedings of the IAU Symposium 250 "Massive stars as cosmic engines"
null
10.1017/S174392130802084X
null
astro-ph
null
The formation of the first generations of stars at redshifts z > 15-20 signaled the transition from the simple initial state of the universe to one of increasing complexity. We here review recent progress in understanding the assembly process of the first galaxies, starting with cosmological initial conditions and modelling the detailed physics of star formation. In particular, we study the role of HD cooling in ionized primordial gas, the impact of UV radiation produced by the first stars, and the propagation of the supernova blast waves triggered at the end of their brief lives. We conclude by discussing how the chemical abundance patterns observed in extremely low-metallicity stars allow us to probe the properties of the first stars.
[ { "version": "v1", "created": "Fri, 1 Feb 2008 22:02:46 GMT" } ]
2009-11-13T00:00:00
[ [ "Johnson", "Jarrett L.", "" ], [ "Greif", "Thomas H.", "" ], [ "Bromm", "Volker", "" ] ]
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802.0208
John C. Loftin
John Loftin and Mao-Pei Tsui
Limits of Solutions to a Parabolic Monge-Ampere Equation
null
null
null
null
math.AP
null
We present the results from our earlier paper (arXiv:math/0602484) on the affine normal flow on noncompact convex hypersurfaces in affine space from a more PDE point of view, emphasizing the estimates involved. Our results concern the limits of solutions to a parabolic Monge-Ampere equation on $S^n$, where a sequence of smooth strictly convex initial value functions increase monotonically to a limiting initial value function which is infinite on at least a hemisphere of $S^n$. We prove long-time existence and instantaneous smoothing for quite general initial data, and we characterize ancient solutions as ellipsoids or paraboloids. We make essential use of estimates of Andrews and Gutierrez-Huang, and barriers due to Calabi.
[ { "version": "v1", "created": "Fri, 1 Feb 2008 21:55:37 GMT" } ]
2008-02-05T00:00:00
[ [ "Loftin", "John", "" ], [ "Tsui", "Mao-Pei", "" ] ]
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802.0209
Corey S. O'Hern
Gregg Lois, Jerzy Blawzdziewicz, and Corey S. O'Hern
Reliable protein folding on non-funneled energy landscapes: the free energy reaction path
13 pages, 9 figures
Biophys. J. 95, 2692 (2008)
10.1529/biophysj.108.133132
null
q-bio.BM
null
A theoretical framework is developed to study the dynamics of protein folding. The key insight is that the search for the native protein conformation is influenced by the rate r at which external parameters, such as temperature, chemical denaturant or pH, are adjusted to induce folding. A theory based on this insight predicts that (1) proteins with non-funneled energy landscapes can fold reliably to their native state, (2) reliable folding can occur as an equilibrium or out-of-equilibrium process, and (3) reliable folding only occurs when the rate r is below a limiting value, which can be calculated from measurements of the free energy. We test these predictions against numerical simulations of model proteins with a single energy scale.
[ { "version": "v1", "created": "Fri, 1 Feb 2008 21:55:57 GMT" } ]
2009-11-13T00:00:00
[ [ "Lois", "Gregg", "" ], [ "Blawzdziewicz", "Jerzy", "" ], [ "O'Hern", "Corey S.", "" ] ]
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802.021
Peter H. Johansson
Peter H. Johansson, Thorsten Naab, Andreas Burkert (USM, Munich)
Equal- and unequal-mass mergers of disk and elliptical galaxies with black holes
22 pages, 15 figures, accepted to ApJ (minor revisions to match accepted version)
null
10.1088/0004-637X/690/1/802
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present binary galaxy merger simulations with varying mass ratios and different progenitor morphologies. The simulations include mergers of gas-rich disks (Sp-Sp), of early-type galaxies and disks (E-Sp, mixed mergers), and mergers of early-type galaxies (E-E, dry mergers). We follow the dynamics of gas, stars and dark matter, and include radiative cooling, star formation and black hole (BH) accretion. For Sp-Sp mergers, the peak star formation rate and BH accretion rate decrease and the growth timescales of the central black holes and newly formed stars increase with higher progenitor mass ratios. The peak BH accretion rate typically occurs shortly after the time of BH merging for low progenitor mass ratios (e.g. 3:1 and lower), whereas for higher progenitor mass ratios there is no clear correlation between the peak BH accretion rate and BH merging time. The termination of star formation by BH feedback in disk mergers is significantly less important for higher progenitor mass ratios (e.g. 3:1 and higher). In addition, the inclusion of BH feedback suppresses efficiently star formation in dry E-E mergers and mixed E-Sp mergers. All merger remnants, independent of their progenitors, follow the observed relations between the central BH mass and the stellar velocity dispersion M_BH-sigma, the bulge mass M_BH-M_* and the bulge binding energy M_BH-M_{*}sigma^2, with the dominant source of scatter arising from variations in the initial gas mass fraction. The normalizations for all relations and the simulated slope of the M_BH-sigma and M_BH-M_{*}sigma^2 relations are in good agreement with the observations, whereas the simulated slope of the M_BH-M_* relation is slightly steeper compared to the observations. (abridged)
[ { "version": "v1", "created": "Mon, 4 Feb 2008 16:29:18 GMT" }, { "version": "v2", "created": "Wed, 10 Sep 2008 14:59:56 GMT" } ]
2009-11-13T00:00:00
[ [ "Johansson", "Peter H.", "", "USM, Munich" ], [ "Naab", "Thorsten", "", "USM, Munich" ], [ "Burkert", "Andreas", "", "USM, Munich" ] ]
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802.0211
Aivars Berzins
Aivars Berzins
On noetherianity for logical formulas over fields
5 pages
null
null
null
math.AG
null
In this paper we consider noetherianity for formulas of propositional and predicate calculus over different fields. Three types of noetherianity are considered: standard noetherianity, logical noetherianity and denumerable noetherianity.
[ { "version": "v1", "created": "Fri, 1 Feb 2008 22:04:35 GMT" } ]
2008-02-05T00:00:00
[ [ "Berzins", "Aivars", "" ] ]
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802.0212
Christine C\'ordula Dantas
Miriam C. B. Alves, Christine C. Dantas, Nanci N. Arai, Rovedy B. da Silva (Institute of Aeronautics and Space - IAE/CTA, Brazil)
A topological formal treatment for scenario-based software specification of concurrent real-time systems
20th International Conference on Software and Systems Engineering and their Applications, Conservatoire des Arts & Metiers, Paris, France, 4-6 December 2007
null
null
null
cs.SE cs.LO
null
Real-time systems are computing systems in which the meeting of their requirements is vital for their correctness. Consequently, if the real-time requirements of these systems are poorly understood and verified, the results can be disastrous and lead to irremediable project failures at the early phases of development. The present work addresses the problem of detecting deadlock situations early in the requirements specification phase of a concurrent real time system, proposing a simple proof-of-concepts prototype that joins scenario-based requirements specifications and techniques based on topology. The efforts are concentrated in the integration of the formal representation of Message Sequence Chart scenarios into the deadlock detection algorithm of Fajstrup et al., based on geometric and algebraic topology.
[ { "version": "v1", "created": "Fri, 1 Feb 2008 22:12:47 GMT" } ]
2008-02-05T00:00:00
[ [ "Alves", "Miriam C. B.", "", "Institute of Aeronautics and Space - IAE/CTA, Brazil" ], [ "Dantas", "Christine C.", "", "Institute of Aeronautics and Space - IAE/CTA, Brazil" ], [ "Arai", "Nanci N.", "", "Institute of Aeronautics and Space - IAE/CTA, Brazil" ], [ "da Silva", "Rovedy B.", "", "Institute of Aeronautics and Space - IAE/CTA, Brazil" ] ]
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802.0213
Kostas Triantafyllopoulos
K. Triantafyllopoulos and P.J. Harrison
Posterior mean and variance approximation for regression and time series problems
25 pages, 2 figures, 2 tables
Statistics (2008), 42, pp. 329-350.
null
null
stat.ME stat.AP
null
This paper develops a methodology for approximating the posterior first two moments of the posterior distribution in Bayesian inference. Partially specified probability models, which are defined only by specifying means and variances, are constructed based upon second-order conditional independence, in order to facilitate posterior updating and prediction of required distributional quantities. Such models are formulated particularly for multivariate regression and time series analysis with unknown observational variance-covariance components. The similarities and differences of these models with the Bayes linear approach are established. Several subclasses of important models, including regression and time series models with errors following multivariate $t$, inverted multivariate $t$ and Wishart distributions, are discussed in detail. Two numerical examples consisting of simulated data and of US investment and change in inventory data illustrate the proposed methodology.
[ { "version": "v1", "created": "Fri, 1 Feb 2008 22:18:34 GMT" } ]
2009-01-27T00:00:00
[ [ "Triantafyllopoulos", "K.", "" ], [ "Harrison", "P. J.", "" ] ]
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802.0214
Kostas Triantafyllopoulos
K. Triantafyllopoulos
Multivariate stochastic volatility with Bayesian dynamic linear models
24 pages, 3 figures, 2 tables
Journal of Statistical Planning and Inference (2008), 138(4), pp. 1021-1037
10.1016/j.jspi.2007.03.057
null
q-fin.ST stat.AP stat.ME
null
This paper develops a Bayesian procedure for estimation and forecasting of the volatility of multivariate time series. The foundation of this work is the matrix-variate dynamic linear model, for the volatility of which we adopt a multiplicative stochastic evolution, using Wishart and singular multivariate beta distributions. A diagonal matrix of discount factors is employed in order to discount the variances element by element and therefore allowing a flexible and pragmatic variance modelling approach. Diagnostic tests and sequential model monitoring are discussed in some detail. The proposed estimation theory is applied to a four-dimensional time series, comprising spot prices of aluminium, copper, lead and zinc of the London metal exchange. The empirical findings suggest that the proposed Bayesian procedure can be effectively applied to financial data, overcoming many of the disadvantages of existing volatility models.
[ { "version": "v1", "created": "Fri, 1 Feb 2008 22:35:49 GMT" } ]
2008-12-02T00:00:00
[ [ "Triantafyllopoulos", "K.", "" ] ]
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802.0215
Mikhail Kapranov
Mikhail Kapranov
Real mixed Hodge structures
26 pages, to appear in Journal of Noncommutative Geometry
null
null
null
math.AG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We identify the category of real mixed Hodge structures with the category of vector bundles with connections (not necessarily flat) on C, equivariant with respect to C^*. Here C is the complex plane considered as a 2-dimensional real manifold, and C^* is the multiplicative group of complex numbers considered as a real group.
[ { "version": "v1", "created": "Sun, 3 Feb 2008 17:55:09 GMT" }, { "version": "v2", "created": "Sat, 10 Jul 2010 12:50:37 GMT" } ]
2010-07-13T00:00:00
[ [ "Kapranov", "Mikhail", "" ] ]
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802.0216
Jeremy Berkowitz
Jeremy Berkowitz
On the Impossibility of a Poincare-invariant Vacuum State with Unit Norm
6 pages
null
null
null
physics.gen-ph
null
In the standard construction of Quantum Field Theory, a vacuum state is required. The vacuum is a vector in a separable, infinite-dimensional Hilbert space often referred to as Fock space. By definition the vacuum wavestate depends on nothing and must be translationally invariant. We show that any such translationally-invariant vector must have a norm that is either divergent or equal to zero. It is impossible for any state to be both everywhere translationally invariant and also have a norm of one. The axioms of QFT cannot be made internally consistent.
[ { "version": "v1", "created": "Fri, 1 Feb 2008 22:40:04 GMT" }, { "version": "v2", "created": "Thu, 7 Feb 2008 03:19:01 GMT" } ]
2008-05-06T00:00:00
[ [ "Berkowitz", "Jeremy", "" ] ]
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802.0217
Craig Roberts
C.D. Roberts, M.S. Bhagwat, S.V. Wright and A. Holl
Aspects of Hadron Physics
64 pages and numerous figures. Published in "Hadron Structure and Nonperturbative QCD", the proceedings of the 44th Winter School on Theoretical Physics (IUTP 44) Schladming, Austria: 11-18 March, 2006
Eur.Phys.J.ST 140:53-116,2007
10.1140/epjst/e2007-00003-5
null
nucl-th
null
Detailed investigations of the structure of hadrons are essential for understanding how matter is constructed from the quarks and gluons of Quantum chromodynamics (QCD), and amongst the questions posed to modern hadron physics, three stand out. What is the rigorous, quantitative mechanism responsible for confinement? What is the connection between confinement and dynamical chiral symmetry breaking? And are these phenomena together sufficient to explain the origin of more than 98% of the mass of the observable universe? Such questions may only be answered using the full machinery of nonperturbative relativistic quantum field theory. This contribution provides a perspective on progress toward answering these key questions. In so doing it will provide an overview of the contemporary application of Dyson-Schwinger equations in Hadron Physics. The presentation assumes that the reader is familiar with the concepts and notation of relativistic quantum mechanics, with the functional integral formulation of quantum field theory and with regularisation and renormalisation in its perturbative formulation.
[ { "version": "v1", "created": "Fri, 1 Feb 2008 22:43:02 GMT" } ]
2010-03-04T00:00:00
[ [ "Roberts", "C. D.", "" ], [ "Bhagwat", "M. S.", "" ], [ "Wright", "S. V.", "" ], [ "Holl", "A.", "" ] ]
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802.0218
Kostas Triantafyllopoulos
K. Triantafyllopoulos
Multivariate control charts based on Bayesian state space models
19 pages, 6 figures
Quality and Reliability Engineering International (2006), 22(6), pp. 693-707
10.1002/qre.807
null
stat.ME stat.AP
null
This paper develops a new multivariate control charting method for vector autocorrelated and serially correlated processes. The main idea is to propose a Bayesian multivariate local level model, which is a generalization of the Shewhart-Deming model for autocorrelated processes, in order to provide the predictive error distribution of the process and then to apply a univariate modified EWMA control chart to the logarithm of the Bayes' factors of the predictive error density versus the target error density. The resulting chart is proposed as capable to deal with both the non-normality and the autocorrelation structure of the log Bayes' factors. The new control charting scheme is general in application and it has the advantage to control simultaneously not only the process mean vector and the dispersion covariance matrix, but also the entire target distribution of the process. Two examples of London metal exchange data and of production time series data illustrate the capabilities of the new control chart.
[ { "version": "v1", "created": "Fri, 1 Feb 2008 22:46:05 GMT" } ]
2008-02-05T00:00:00
[ [ "Triantafyllopoulos", "K.", "" ] ]
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802.0219
Kostas Triantafyllopoulos
K. Triantafyllopoulos
Dynamic generalized linear models for non-Gaussian time series forecasting
38 pages, 12 figures, 4 tables
null
null
null
stat.ME stat.AP
null
The purpose of this paper is to provide a discussion, with illustrating examples, on Bayesian forecasting for dynamic generalized linear models (DGLMs). Adopting approximate Bayesian analysis, based on conjugate forms and on Bayes linear estimation, we describe the theoretical framework and then we provide detailed examples of response distributions, including binomial, Poisson, negative binomial, geometric, normal, log-normal, gamma, exponential, Weibull, Pareto, beta, and inverse Gaussian. We give numerical illustrations for all distributions (except for the normal). Putting together all the above distributions, we give a unified Bayesian approach to non-Gaussian time series analysis, with applications from finance and medicine to biology and the behavioural sciences. Throughout the models we discuss Bayesian forecasting and, for each model, we derive the multi-step forecast mean. Finally, we describe model assessment using the likelihood function, and Bayesian model monitoring.
[ { "version": "v1", "created": "Fri, 1 Feb 2008 22:52:41 GMT" } ]
2008-02-05T00:00:00
[ [ "Triantafyllopoulos", "K.", "" ] ]
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802.022
Kostas Triantafyllopoulos
K. Triantafyllopoulos
Forecasting with time-varying vector autoregressive models
17 pages, 7 figures, tables 3
null
null
null
q-fin.ST stat.AP stat.ME
null
The purpose of this paper is to propose a time-varying vector autoregressive model (TV-VAR) for forecasting multivariate time series. The model is casted into a state-space form that allows flexible description and analysis. The volatility covariance matrix of the time series is modelled via inverted Wishart and singular multivariate beta distributions allowing a fully conjugate Bayesian inference. Model performance and model comparison is done via the likelihood function, sequential Bayes factors, the mean of squared standardized forecast errors, the mean of absolute forecast errors (known also as mean absolute deviation), and the mean forecast error. Bayes factors are also used in order to choose the autoregressive order of the model. Multi-step forecasting is discussed in detail and a flexible formula is proposed to approximate the forecast function. Two examples, consisting of bivariate data of IBM shares and of foreign exchange (FX) rates for 8 currencies, illustrate the methods. For the IBM data we discuss model performance and multi-step forecasting in some detail. For the FX data we discuss sequential portfolio allocation; for both data sets our empirical findings suggest that the TV-VAR models outperform the widely used VAR models.
[ { "version": "v1", "created": "Fri, 1 Feb 2008 22:58:24 GMT" }, { "version": "v2", "created": "Sun, 17 Feb 2008 12:00:10 GMT" } ]
2008-12-02T00:00:00
[ [ "Triantafyllopoulos", "K.", "" ] ]
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802.0221
Eli Dwek
Eli Dwek and Richard G. Arendt
Infrared Echoes Reveal the Shock Breakout of the Cas A Supernova
Submitted to The Astrophysical Journal - 33 pages including 13 figures - Accepted for publication in The ApJ - revised text and added references and figure
null
10.1086/589988
null
astro-ph
null
(Condensed form) - The serendipitous discovery of infrared echoes around the supernova remnant of Cas A by the Spitzer satellite has provided astronomers with a unique opportunity to study the properties of the echoing material and the history and nature of the outburst that generated these echoes. All the echoes located within a distance of ~15 arcmin from the SN are caused by the delayed arrival of thermal emission from dust located at a distance of 160 lyr (corresponding to half the adopted age of the remnant) directly behind the origin of the explosion. The spectra of the echoes are distinct from that of the general diffuse interstellar medium (ISM) revealing hot silicate grains that are either stochastically heated to temperatures in excess of ~150 K, or radiating at an equilibrium temperature of this value. We show that the optical light curve from the supernova, is not capable of producing such spectra, and could therefore not have given rise to the echoes. Instead, we find that the echoes were generated by an intense and short burst of EUV-UV radiation with a luminosity of ~ 1.5E11 Lsun. The average H-column density of the IR emitting region in the echoing clouds is about 5E17 cm-2. Taking a burst time of ~1 d gives a cloud density of ~200 cm-3, typical of dense IR cirrus.
[ { "version": "v1", "created": "Fri, 1 Feb 2008 23:25:38 GMT" }, { "version": "v2", "created": "Fri, 9 May 2008 21:11:09 GMT" } ]
2009-11-13T00:00:00
[ [ "Dwek", "Eli", "" ], [ "Arendt", "Richard G.", "" ] ]
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802.0222
Zeb Barber
Z. W. Barber, J. E. Stalnaker, N. D. Lemke, N. Poli, C. W. Oates, T. M. Fortier, S. A. Diddams, L. Hollberg, C. W. Hoyt
Optical Lattice Induced Light Shifts in an Yb Atomic Clock
Accepted to PRL
null
10.1103/PhysRevLett.100.103002
null
physics.atom-ph
null
We present an experimental study of the lattice induced light shifts on the 1S_0-3P_0 optical clock transition (v_clock~518 THz) in neutral ytterbium. The ``magic'' frequency, v_magic, for the 174Yb isotope was determined to be 394 799 475(35)MHz, which leads to a first order light shift uncertainty of 0.38 Hz on the 518 THz clock transition. Also investigated were the hyperpolarizability shifts due to the nearby 6s6p 3P_0 - 6s8p 3P_0, 6s8p 3P_2, and 6s5f 3F_2 two-photon resonances at 759.708 nm, 754.23 nm, and 764.95 nm respectively. By tuning the lattice frequency over the two-photon resonances and measuring the corresponding clock transition shifts, the hyperpolarizability shift was estimated to be 170(33) mHz for a linear polarized, 50 uK deep, lattice at the magic wavelength. In addition, we have confirmed that a circularly polarized lattice eliminates the J=0 - J=0 two-photon resonance. These results indicate that the differential polarizability and hyperpolarizability frequency shift uncertainties in a Yb lattice clock could be held to well below 10^-17.
[ { "version": "v1", "created": "Fri, 1 Feb 2008 23:31:55 GMT" } ]
2009-11-13T00:00:00
[ [ "Barber", "Z. W.", "" ], [ "Stalnaker", "J. E.", "" ], [ "Lemke", "N. D.", "" ], [ "Poli", "N.", "" ], [ "Oates", "C. W.", "" ], [ "Fortier", "T. M.", "" ], [ "Diddams", "S. A.", "" ], [ "Hollberg", "L.", "" ], [ "Hoyt", "C. W.", "" ] ]
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802.0223
Kostas Triantafyllopoulos
K. Triantafyllopoulos
Multivariate stochastic volatility using state space models
null
null
null
null
q-fin.ST stat.AP stat.ME
null
A Bayesian procedure is developed for multivariate stochastic volatility, using state space models. An autoregressive model for the log-returns is employed. We generalize the inverted Wishart distribution to allow for different correlation structure between the observation and state innovation vectors and we extend the convolution between the Wishart and the multivariate singular beta distribution. A multiplicative model based on the generalized inverted Wishart and multivariate singular beta distributions is proposed for the evolution of the volatility and a flexible sequential volatility updating is employed. The proposed algorithm for the volatility is fast and computationally cheap and it can be used for on-line forecasting. The methods are illustrated with an example consisting of foreign exchange rates data of 8 currencies. The empirical results suggest that time-varying correlations can be estimated efficiently, even in situations of high dimensional data.
[ { "version": "v1", "created": "Fri, 1 Feb 2008 23:34:43 GMT" } ]
2008-12-02T00:00:00
[ [ "Triantafyllopoulos", "K.", "" ] ]
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802.0224
David Minh
David D. L. Minh and Artur B. Adib
Optimized free energies from bidirectional single-molecule force spectroscopy
4 pages, 2 figures
Phys. Rev. Lett. 100, 180602 (2008)
10.1103/PhysRevLett.100.180602
null
cond-mat.stat-mech
null
An optimized method for estimating path-ensemble averages using data from processes driven in opposite directions is presented. Based on this estimator, bidirectional expressions for reconstructing free energies and potentials of mean force from single-molecule force spectroscopy - valid for biasing potentials of arbitrary stiffness - are developed. Numerical simulations on a model potential indicate that these methods perform better than unidirectional strategies.
[ { "version": "v1", "created": "Sat, 2 Feb 2008 07:38:43 GMT" }, { "version": "v2", "created": "Thu, 10 Apr 2008 20:57:04 GMT" } ]
2008-05-07T00:00:00
[ [ "Minh", "David D. L.", "" ], [ "Adib", "Artur B.", "" ] ]
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802.0225
Yi-Fang Chang
Yi-Fang Chang
Nonlinear Dynamics, Magnitude-Period Formula and Forecasts on Earthquake
7 pages
null
null
null
physics.gen-ph physics.geo-ph
null
Based on the geodynamics, an earthquake does not take place until the momentum-energy excess a faulting threshold value of rock due to the movement of the fluid layer under the rock layer and the transport and accumulation of the momentum. From the nonlinear equations of fluid mechanics, a simplified nonlinear solution of momentum corresponding the accumulation of the energy could be derived. Otherwise, a chaos equation could be obtained, in which chaos corresponds to the earthquake, which shows complexity on seismology, and impossibility of exact prediction of earthquakes. But, combining the Carlson-Langer model and the Gutenberg-Richter relation, the magnitude-period formula of the earthquake may be derived approximately, and some results can be calculated quantitatively. For example, we forecast a series of earthquakes of 2004, 2009 and 2014, especially in 2019 in California. Combining the Lorenz model, we discuss the earthquake migration to and fro. Moreover, many external causes for earthquake are merely the initial conditions of this nonlinear system.
[ { "version": "v1", "created": "Sat, 2 Feb 2008 00:00:04 GMT" } ]
2008-02-05T00:00:00
[ [ "Chang", "Yi-Fang", "" ] ]
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802.0226
Benjamin Zuckerman
B. Zuckerman, C. Melis, Inseok Song, David S. Meier, Marshall D. Perrin, Bruce Macintosh, Christian Marois, Alycia J. Weinberger, Joseph H. Rhee, James R. Graham, Joel H. Kastner, Patrick Palmer, T. Forveille, E.E. Becklin, D. J. Wilner, T. S. Barman, G. W. Marcy, M. S. Bessell
Gas and Dust Associated with the Strange, Isolated, Star BP Piscium
Accepted for Astrophysical Journal New version with minor changes: includes fixing a typo on the 3rd line of the paragraph that follows Equa 4 and adding a new reference (Nordhaus and Blackman 2006)
null
10.1086/587448
null
astro-ph
null
We have carried out a multiwavelength observational campaign demonstrating some of the remarkable properties of the infrared-bright variable star BP Psc. Surrounded by a compact dusty, gaseous disk, this little-studied late-G (or early-K) type star emits about 75% of its detected energy flux at infrared wavelengths. Evidence for accretion of gas in conjunction with narrow bi-polar jets and Herbig-Haro objects is apparently consistent with classification of BP Psc as a pre-main sequence star, as postulated in most previous studies. If young, then BP Psc would be one of the nearest and oldest known classical T Tauri stars. However, such an evolutionary classification encounters various problems that are absent or much less severe if BP Psc is instead a luminosity class III post-main sequence star. In this case, it would be the first known example of a first ascent giant surrounded by a massive molecular disk with accompanying rapid gas accretion and prominent jets and HH objects. In this model, the genesis of the massive dusty gaseous disk could be a consequence of the envelopment of a low mass companion star. Properties in the disk may be conducive to the current formation of planets, a gigayear or more after the formation of BP Psc itself.
[ { "version": "v1", "created": "Sat, 2 Feb 2008 00:14:39 GMT" }, { "version": "v2", "created": "Thu, 14 Feb 2008 02:19:12 GMT" } ]
2009-11-13T00:00:00
[ [ "Zuckerman", "B.", "" ], [ "Melis", "C.", "" ], [ "Song", "Inseok", "" ], [ "Meier", "David S.", "" ], [ "Perrin", "Marshall D.", "" ], [ "Macintosh", "Bruce", "" ], [ "Marois", "Christian", "" ], [ "Weinberger", "Alycia J.", "" ], [ "Rhee", "Joseph H.", "" ], [ "Graham", "James R.", "" ], [ "Kastner", "Joel H.", "" ], [ "Palmer", "Patrick", "" ], [ "Forveille", "T.", "" ], [ "Becklin", "E. E.", "" ], [ "Wilner", "D. J.", "" ], [ "Barman", "T. S.", "" ], [ "Marcy", "G. W.", "" ], [ "Bessell", "M. S.", "" ] ]
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802.0227
Christopher Savage
Katherine Freese, William H. Kinney, Christopher Savage
Natural Inflation: the status after WMAP 3-year data
To appear in the proceedings of From Quantum to Cosmos: Fundamental Physics Research in Space, Washington, D.C., 22-24 May 2006
Int.J.Mod.Phys.D16:2573-2585,2008
10.1142/S0218271807011371
null
hep-ph
null
The model of Natural Inflation is examined in light of recent 3-year data from the Wilkinson Microwave Anisotropy Probe and shown to provide a good fit. The inflaton potential is naturally flat due to shift symmetries, and in the simplest version takes the form $V(\phi) = \Lambda^4 [1 \pm \cos(N\phi/f)]$. The model agrees with WMAP3 measurements as long as $f > 0.7 m_{Pl}$ (where $m_{Pl} = 1.22 \times 10^{19}$GeV) and $\Lambda \sim m_{GUT}$. The running of the scalar spectral index is shown to be small -- an order of magnitude below the sensitivity of WMAP3. The location of the field in the potential when perturbations on observable scales are produced is examined; for $f > 5 m_{Pl}$, the relevant part of the potential is indistinguishable from a quadratic, yet has the advantage that the required flatness is well-motivated. Depending on the value of $f$, the model falls into the large field ($f \ge 1.5 m_{Pl}$) or small field ($f < 1.5 m_{Pl}$) classification scheme that has been applied to inflation models. Natural inflation provides a good fit to WMAP3 data.
[ { "version": "v1", "created": "Sat, 2 Feb 2008 00:26:30 GMT" } ]
2008-11-26T00:00:00
[ [ "Freese", "Katherine", "" ], [ "Kinney", "William H.", "" ], [ "Savage", "Christopher", "" ] ]
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802.0228
Kentaro Nagamine
Kentaro Nagamine (UNLV), Masami Ouchi (OCIW, ICRR), Volker Springel (MPA, HITS), Lars Hernquist (Harvard)
Lyman-alpha Emitters and Lyman-break Galaxies at z=3-6 in Cosmological SPH Simulations
21 pages, 9 figures, PASJ, in press, Dec 2010 issue
2010, PASJ, 62, 1455
10.1093/pasj/62.6.1455
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the properties of Lyman-alpha emitters (LAEs) and Lyman-break galaxies (LBGs) at z=3-6 using cosmological SPH simulations. We investigate two simple scenarios for explaining the observed Ly-a and rest-frame UV luminosity functions (LFs) of LAEs: (i) the "escape fraction" scenario, in which the "effective" escape fraction (including the IGM attenuation) of Ly-a photons is f_Lya ~0.1 (0.15) at z=3 (6), and (ii) the "stochastic" scenario, in which the fraction of LAEs that are turned on at z=3 (6) is \Cstoc ~0.07 (0.2) after correcting for the IGM attenuation. Our comparisons with a number of different observations suggest that the stochastic scenario is preferred over the escape fraction scenario. We find that the mean values of stellar mass, metallicity and black hole mass hosted by LAEs are all smaller in the stochastic scenario than in the escape fraction scenario. In our simulations, the galaxy stellar mass function evolves rapidly, as expected in hierarchical structure formation. However, its evolution is largely compensated by a beginning decline in the specific star formation rate, resulting in little evolution of the rest-frame UV LF from z=6 to 3. The rest-frame UV LF of both LAEs and LBGs at z=3 & 6 can be described well by the stochastic scenario provided the extinction is moderate, E(B-V) ~0.15, for both populations, although our simulation might be overpredicting the number of bright LBGs at z=6. We also discuss the correlation function and bias of LAEs. The Ly-a LFs at z=6 in a field-of-view of 0.2 deg^2 show a significantly larger scatter owing to cosmic variance relative to that in a 1 deg^2 field, and the scatter seen in the current observational estimates of the Ly-a LF can be accounted for by cosmic variance.
[ { "version": "v1", "created": "Sat, 2 Feb 2008 00:33:32 GMT" }, { "version": "v2", "created": "Tue, 28 Sep 2010 17:57:30 GMT" } ]
2015-05-13T00:00:00
[ [ "Nagamine", "Kentaro", "", "UNLV" ], [ "Ouchi", "Masami", "", "OCIW, ICRR" ], [ "Springel", "Volker", "", "MPA, HITS" ], [ "Hernquist", "Lars", "", "Harvard" ] ]
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802.0229
Maxim Durach
Maxim Durach, Anastasia Rusina, Victor I. Klimov, and Mark I. Stockman
Nanoplasmonic Renormalization and Enhancement of Coulomb Interactions
null
null
10.1088/1367-2630/10/10/105011
null
physics.optics
null
Nanostructured plasmonic metal systems are known to enhance greatly variety of radiative and nonradiative optical processes, both linear and nonlinear, which are due to the interaction of an electron in a molecule or semiconductor with the enhanced local optical field of the surface plasmons. Principally different are numerous many-body phenomena that are due to the Coulomb interaction between charged particles: carriers (electrons and holes) and ions. These include carrier-carrier or carrier-ion scattering, energy and momentum transfer (including the drag effect), thermal equilibration, exciton formation, impact ionization, Auger effects, etc. It is not widely recognized that these and other many-body effects can also be modified and enhanced by the surface-plasmon local fields. A special but extremely important class of such many-body phenomena is constituted by chemical reactions at metal surfaces, including catalytic reactions. Here, we propose a general and powerful theory of the plasmonic enhancement of the many-body phenomena resulting in a closed expression for the surface plasmon-dressed Coulomb interaction. We illustrate this theory by computing this dressed interaction explicitly for an important example of metal-dielectric nanoshells, which exhibits a reach resonant behavior in both the magnitude and phase. This interaction is used to describe the nanoplasmonic-enhanced Foerster energy transfer between nanocrystal quantum dots in the proximity of a plasmonic nanoshell. Catalysis at nanostructured metal surfaces, nonlocal carrier scattering and surface-enhanced Raman scattering are discussed among other effects and applications where the nanoplasmonic renormalization of the Coulomb interaction may be of principal importance.
[ { "version": "v1", "created": "Sat, 2 Feb 2008 00:36:29 GMT" } ]
2009-11-13T00:00:00
[ [ "Durach", "Maxim", "" ], [ "Rusina", "Anastasia", "" ], [ "Klimov", "Victor I.", "" ], [ "Stockman", "Mark I.", "" ] ]
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802.023
Dane McCamey
D. R. McCamey, G. W. Morley, H. A. Seipel, L. C. Brunel, J. van Tol and C. Boehme
Spin-dependent processes at the crystalline Si-SiO_2 interface at high magnetic fields
10 pages, 4 figures
Phys. Rev. B 78, 045303 (2008)
10.1103/PhysRevB.78.045303
null
cond-mat.other cond-mat.mtrl-sci
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
An experimental study on the nature of spin-dependent excess charge carrier transitions at the interface between (111) oriented phosphorous doped ([P] ~ 10^15 cm^3) crystalline silicon and silicon dioxide at high magnetic field (B_0 ~ 8.5 T) is presented. Electrically detected magnetic resonance (EDMR) spectra of the hyperfine split 31P donor electron transitions and paramagnetic interface defects were conducted at temperatures in the range 3 K < T < 12 K. The results at these previously unattained (for EDMR) magnetic field strengths reveal the dominance of spin-dependent processes that differ from the previously well investigated recombination between the 31P donor and the P_b state, which dominates at low magnetic fields. While magnetic resonant current responses due to 31P and P_b states are still present, they do not correlate and only the P_b contribution can be associated with an interface process due to spin-dependent tunneling between energetically and physically adjacent P_b states. This work provides an experimental demonstration of spin-dependent tunneling between physically adjacent and identical electronic states as proposed by Kane for readout of donor qubits.
[ { "version": "v1", "created": "Sat, 2 Feb 2008 00:38:27 GMT" }, { "version": "v2", "created": "Thu, 5 Jun 2008 17:04:12 GMT" } ]
2008-07-07T00:00:00
[ [ "McCamey", "D. R.", "" ], [ "Morley", "G. W.", "" ], [ "Seipel", "H. A.", "" ], [ "Brunel", "L. C.", "" ], [ "van Tol", "J.", "" ], [ "Boehme", "C.", "" ] ]
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802.0231
Jan Gutowski
Jai Grover, Jan B. Gutowski, Wafic Sabra
Null Half-Supersymmetric Solutions in Five-Dimensional Supergravity
46 pages, typos corrected and reference added. Section 7.1 has been added: it is shown that the solutions found here correspond to a class of solutions found in arXiv:0708.3695. Uses JHEP3.cls
null
10.1088/1126-6708/2008/10/103
null
hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We classify half-supersymmetric solutions of gauged N=2, D=5 supergravity coupled to an arbitrary number of abelian vector multiplets for which all of the Killing spinors generate null Killing vectors. We show that there are four classes of solutions, and in each class we find the metric, scalars and gauge field strengths. When the scalar manifold is symmetric, the solutions correspond to a class of local near horizon geometries recently found by Kunduri and Lucietti.
[ { "version": "v1", "created": "Sat, 2 Feb 2008 01:03:40 GMT" }, { "version": "v2", "created": "Wed, 6 Feb 2008 12:43:53 GMT" }, { "version": "v3", "created": "Mon, 21 Jul 2008 13:22:57 GMT" } ]
2009-11-13T00:00:00
[ [ "Grover", "Jai", "" ], [ "Gutowski", "Jan B.", "" ], [ "Sabra", "Wafic", "" ] ]
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802.0232
Mang Feng
T.T. Ren, M. Feng, W.-L. Chang, J. Luo and M.S. Zhan
Quantum mechanical NMR implementation of DNA algorithm for satisfiability problem
4 pages, 4 figures, but one figure is missed in this submission due to too big size
null
null
null
quant-ph
null
DNA computation could in principle solve the satisfiability (SAT) problem due to the operations in parallel on extremely large numbers of strands. We demonstrate some quantum gates corresponding to the DNA ones, based on which an implementation of DNA algorithm for SAT problem is available by quantum mechanical way. Since quantum computation owns the favorable feature of operations in parallel on 2$^{n}$ states by using only n qubits, instead of 2$^{n}$ strands in DNA computation, computational complexity is much reduced in treating the SAT problem quantum mechanically. We take a three-clause SAT problem with two variables as an example, and carry out a NMR experiment for solving a one-variable SAT problem.
[ { "version": "v1", "created": "Sat, 2 Feb 2008 01:17:07 GMT" } ]
2008-02-05T00:00:00
[ [ "Ren", "T. T.", "" ], [ "Feng", "M.", "" ], [ "Chang", "W. -L.", "" ], [ "Luo", "J.", "" ], [ "Zhan", "M. S.", "" ] ]
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802.0233
Richard Gott III
J. Richard Gott III
Boltzmann Brains--I'd Rather See Than Be One
18 pages
null
null
null
gr-qc
null
A perceived problem with the standard flat-lambda model is that in the far future spacetime becomes an exponentially expanding de Sitter space, filled with Gibbons-Hawking thermal radiation, and given infinite time there will appear an infinite number of Boltzmann Brains (BB's) per finite co-moving volume today. If BB's outnumber ordinary observers by an infinite factor, why am I not one? This Gibbons-Hawking thermal radiation is observer dependent--due to observer dependent event horizons. Different observers moving relative to each other will see different photons, and different BB's. I will argue that the only particles that are real are the particles dredged out of the quantum vacuum state by particular real material detectors. (In much the same way, accelerated detectors dredge thermal Unruh radiation out of the Minkowski vacuum due to their observer dependent event horizons.) Thus, I may see a thermal BB, but cannot be one. Observer independent BB's can be created by quantum tunneling events, but the rate at which ordinary observers are being added to the universe by tunneling events to inflating regions exceeds the rate for producing BB's by tunneling by an infinite factor. I also argue that BB's do not really pass the Turing test for intelligent observers. Thus, the standard flat-lambda model is safe.
[ { "version": "v1", "created": "Sat, 2 Feb 2008 04:05:05 GMT" } ]
2008-02-05T00:00:00
[ [ "Gott", "J. Richard", "III" ] ]
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802.0234
Marco Regis
Marco Regis and Piero Ullio
Multi-wavelength signals of dark matter annihilations at the Galactic center
26 pages, 32 figures, treatments of starlight and interstellar medium improved, other minor changes, references added
Phys.Rev.D78:043505,2008
10.1103/PhysRevD.78.043505
null
hep-ph astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We perform a systematic study of the multi-wavelength signal induced by weakly interacting massive particle (WIMP) annihilations at the Galactic Center (GC). Referring to a generic WIMP dark matter (DM) scenario and depending on astrophysical inputs, we discuss spectral and angular features and sketch correlations among signals in the different energy bands. None of the components which have been associated to the GC source Sgr A*, nor the diffuse emission components from the GC region, have spectral or angular features typical of a DM source. Still, data-sets at all energy bands, namely, the radio, near infrared, X-ray and gamma-ray bands, contribute to place significant constraints on the WIMP parameter space. In general, the gamma-ray energy range is not the one with the largest signal to background ratio. In the case of large magnetic fields close to the GC, X-ray data give the tightest bounds. The emission in the radio-band, which is less model dependent, is very constraining as well. The recent detection by HESS of a GC gamma-ray source, and of a diffuse gamma-ray component, limits the possibility of a DM discovery with next generation of gamma-ray telescopes, like GLAST and CTA. We find that the most of the region in the parameter space accessible to these instruments is actually already excluded at other wave-lenghts. On the other hand, there may be still an open window to improve constraints with wide-field radio observations.
[ { "version": "v1", "created": "Sat, 2 Feb 2008 06:06:18 GMT" }, { "version": "v2", "created": "Mon, 4 Aug 2008 16:26:37 GMT" } ]
2008-11-26T00:00:00
[ [ "Regis", "Marco", "" ], [ "Ullio", "Piero", "" ] ]
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802.0235
Alexander Holevo
A. S. Holevo
Entanglement-breaking channels in infinite dimensions
16 pages
Problems of Information Transmission 44:3 (2008) 3-18
null
null
quant-ph
null
We give a representation for entanglement-breaking channels in separable Hilbert space that generalizes the "Kraus decomposition with rank one operators" and use it to describe the complementary channels. We also give necessary and sufficient condition of entanglement-breaking for a general quantum Gaussian channel. Application of this condition to one-mode channels provides several new cases where the additivity conjecture holds in full generality.
[ { "version": "v1", "created": "Sun, 3 Feb 2008 19:10:54 GMT" } ]
2010-11-23T00:00:00
[ [ "Holevo", "A. S.", "" ] ]
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802.0236
Zhong-Juan Yang
Hai-Feng Li, Hong-lei Li, Zong-Guo Si, Zhong-Juan Yang
Unparticle Effects on Top Quark Pair Production at Photon Collider
13 pages, 5figures
Commun.Theor.Phys.51:707-712,2009
10.1088/0253-6102/51/4/24
null
hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The unparticle effects on $t\bar t$ production at the future photon collider are investigated. Distributions of $t\bar t$ invariant mass and that for transverse momentum of top quark with respect to Standard Model and unparticle production are predicted. An odd valley with scalar unparticle contribution appears for some values of $d_{\U}$, which is due to the big cancellation between the contribution from SM and that from unparticle. This character may be used to study the properties of scalar unparticle. Our investigations also show that scalar unparticle may play a significant role in $t \bar t$ production at photon collider if it exists.
[ { "version": "v1", "created": "Sat, 2 Feb 2008 06:57:45 GMT" }, { "version": "v2", "created": "Fri, 29 May 2009 00:53:21 GMT" } ]
2009-05-29T00:00:00
[ [ "Li", "Hai-Feng", "" ], [ "Li", "Hong-lei", "" ], [ "Si", "Zong-Guo", "" ], [ "Yang", "Zhong-Juan", "" ] ]
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802.0237
Shan Qiao Dr.
S. Qiao, Dewei Ma, Donglai Feng, Z. Hussain, Z. -X. Shen
Knot undulator to generate linearly polarized photons with low on-axis power density
null
Rev.Sci.Instrum.80:085108,2009
10.1063/1.3204452
null
physics.acc-ph
null
Heat load on beamline optics is a serious problem to generate pure linearly polarized photons in the third generation synchrotron radiation facilities. For permanent magnet undulators, this problem can be overcome by a figure-8 operating mode. But there is still no good method to tackle this problem for electromagnetic elliptical undulators. Here, a novel operating mode is suggested, which can generate pure linearly polarized photons with very low on-axis heat load. Also the available minimum photon energy of linearly polarized photons can be extended much by this method.
[ { "version": "v1", "created": "Sat, 2 Feb 2008 09:06:37 GMT" } ]
2010-11-02T00:00:00
[ [ "Qiao", "S.", "" ], [ "Ma", "Dewei", "" ], [ "Feng", "Donglai", "" ], [ "Hussain", "Z.", "" ], [ "Shen", "Z. -X.", "" ] ]
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802.0238
Akinobu Dote
Akinobu Dot\'e, Tetsuo Hyodo, and Wolfram Weise
$K^-pp$ system with chiral SU(3) effective interaction
11 pages, submitted to Nuclear Physics A
Nucl.Phys.A804:197-206,2008
10.1016/j.nuclphysa.2008.02.001
null
nucl-th
null
The $K^-pp$ system is investigated using a variational approach with realistic two-body interactions: the Argonne v18 $NN$ potential and an energy dependent $\bar{K}N$ effective interaction derived from chiral SU(3) coupled-channel dynamics. Uncertainties in subthreshold extrapolations of the $\bar{K}N$ interaction are considered. A weakly bound $K^-pp$ state is found, with a binding energy $B = (19\pm 3)$ MeV substantially smaller than suggested in previous calculations. The decay width $\Gamma(K^-pp\to \pi\Sigma N)$ is estimated to range between about 40 and 70 MeV.
[ { "version": "v1", "created": "Sat, 2 Feb 2008 09:07:34 GMT" } ]
2008-11-26T00:00:00
[ [ "Doté", "Akinobu", "" ], [ "Hyodo", "Tetsuo", "" ], [ "Weise", "Wolfram", "" ] ]
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802.0239
Takuya Saito
Y. Nakagawa, A. Nakamura, T. Saito, H. Toki
The volume dependence of the long-range two-body potentials in various color channels by lattice QCD
17 pages, 8 figures, v2: typos corrected
Phys.Rev.D77:034015,2008
10.1103/PhysRevD.77.034015
null
hep-lat hep-ph
null
We study the color-dependent confining forces between two quarks by the quenched lattice simulations of Coulomb gauge QCD. The color-singlet and color-antitriplet instantaneous potentials yield attractive forces. The ratio of the string tensions obtained from them is approximately 2 and have little volume dependence. Meanwhile, the color-octet and color-sextet channels give a minor contribution for two-quark system. We finally find that the infrared self-energy of the color-nonsinglet channels diverges in the infinite volume limit; however, the degree of the divergence on the finite lattice can be understood in terms of color factors.
[ { "version": "v1", "created": "Sat, 2 Feb 2008 10:06:31 GMT" }, { "version": "v2", "created": "Mon, 18 Feb 2008 05:44:03 GMT" } ]
2008-11-26T00:00:00
[ [ "Nakagawa", "Y.", "" ], [ "Nakamura", "A.", "" ], [ "Saito", "T.", "" ], [ "Toki", "H.", "" ] ]
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802.024
Ye Yeo
Siqing Yu, Yechao Zhu, and Ye Yeo
Hyperfine interaction induced decoherence and deterministic teleportation of electrons in a quantum dot nanostructure
10 pages
Phys. Rev. A 77, 062338 (2008)
10.1103/PhysRevA.77.062338
null
quant-ph
null
Recently, de Visser and Blaauboer [Phys. Rev. Lett. {\bf 96}, 246801 (2006)] proposed the most efficient deterministic teleportation protocol $\cal T$ for electron spins in a semiconductor nanostructure consisting of a single and a double quantum dot. However, it is as yet unknown if $\cal T$ can be completed before decoherence sets in. In this paper we analyze the detrimental effect of nuclear spin baths, the main source of decoherence, on $\cal T$. We show that nonclassical teleportation fidelity can be achieved with $\cal T$ provided certain conditions are met. Our study indicates that realization of quantum computation with quantum dots is indeed promising.
[ { "version": "v1", "created": "Sat, 2 Feb 2008 10:16:33 GMT" } ]
2017-01-18T00:00:00
[ [ "Yu", "Siqing", "" ], [ "Zhu", "Yechao", "" ], [ "Yeo", "Ye", "" ] ]
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802.0241
Denis Duhamel
Abdelaziz Sameur, Honor\'e Yin, Denis Duhamel, Vladimir Vilke
A simple model for elastic and viscoelastic punch indentation problems with experimental validation
null
null
null
null
physics.class-ph
null
This paper presents an analytical model of punctual elastic contact between a rigid body of arbitrary geometry and a plane surface. A simple analytical model is developed in order to evaluate the contact force knowing the volume of interpenetration, the surface and the perimeter of the base of this volume and the mechanical characteristics of surfaces in contact. Analytical and experimental validations are made for this model in the case of simple shapes (spherical, conical and pyramidal). Next, an approach for the resolution in case of contact between a rigid body and a viscoelastic plane is presented. The elastic constants are replaced by an integral operator corresponding to the viscoelastic stress-strain relation. At last, the viscoelastic punctual contact is studied analytically and validated experimentally.
[ { "version": "v1", "created": "Sat, 2 Feb 2008 10:31:57 GMT" } ]
2008-02-05T00:00:00
[ [ "Sameur", "Abdelaziz", "" ], [ "Yin", "Honoré", "" ], [ "Duhamel", "Denis", "" ], [ "Vilke", "Vladimir", "" ] ]
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802.0242
Zengru Di
Yanqing Hu, Hongbin Chen, Peng Zhang, Menghui Li, Zengru Di, Ying Fan
A New Comparative Definition of Community and Corresponding Identifying Algorithm
11 pages, 4 fihures
null
10.1103/PhysRevE.78.026121
null
physics.soc-ph
null
In this paper, a new comparative definition for community in networks is proposed and the corresponding detecting algorithm is given. A community is defined as a set of nodes, which satisfy that each node's degree inside the community should not be smaller than the node's degree toward any other community. In the algorithm, the attractive force of a community to a node is defined as the connections between them. Then employing attractive force based self-organizing process, without any extra parameter, the best communities can be detected. Several artificial and real-world networks, including Zachary Karate club network and College football network are analyzed. The algorithm works well in detecting communities and it also gives a nice description for network division and group formation.
[ { "version": "v1", "created": "Sat, 2 Feb 2008 10:38:01 GMT" } ]
2009-11-13T00:00:00
[ [ "Hu", "Yanqing", "" ], [ "Chen", "Hongbin", "" ], [ "Zhang", "Peng", "" ], [ "Li", "Menghui", "" ], [ "Di", "Zengru", "" ], [ "Fan", "Ying", "" ] ]
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802.0243
Leonid A. Openov
L. A. Openov
Phonon-induced decoherence of the two-level quantum subsystem due to relaxation and dephasing processes
20 pages, no figures
Physics Letters A 372 (2008) 3476
10.1016/j.physleta.2008.01.064
null
cond-mat.other cond-mat.mes-hall
null
Phonon-related decoherence effects in a quantum double-well two-level subsystem coupled to a solid are studied theoretically by the example of deformation phonons. Expressions for the reduced density matrix at T=0 are derived beyond the Markovian approximation by means of explicit solution of the non-stationary Schrodinger equation for the interacting electron-phonon system at the initial stage of its evolution. It is shown that as long as the difference between the energies of the electron in the left and the right well greatly exceeds the energy of the electron tunneling between the minima of the double-well potential, decoherence is primarily due to dephasing processes. This case corresponds to a strongly asymmetric potential and spatially separated eigenfunctions localized in the vicinity of one or another potential minimum. In the opposite case of the symmetric potential, the decoherence stems from the relaxation processes, which may be either "resonant" (at relatively long times) or "nonresonant" (at short times), giving rise to qualitatively different temporal evolution of the electron state. The results obtained are discussed in the context of quantum information processing based on the quantum bits encoded in electron charge degrees of freedom.
[ { "version": "v1", "created": "Sat, 2 Feb 2008 11:36:52 GMT" } ]
2009-11-13T00:00:00
[ [ "Openov", "L. A.", "" ] ]
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802.0244
Dmitri Akhiezer
Dmitri Akhiezer
Spherical Stein manifolds and the Weyl involution
12 pages
Ann. Inst. Fourier, Grenoble 59, 3 (2009) 1029-1041
null
null
math.CV math.RT
null
It is proved that a Stein manifold acted on by a connected compact Lie group is spherical if and only if there exists an antiholomorphic involution preserving each orbit of the action. This involution can be chosen equivariant with respect to a Weyl involution of the group.
[ { "version": "v1", "created": "Sat, 2 Feb 2008 12:04:22 GMT" } ]
2009-08-19T00:00:00
[ [ "Akhiezer", "Dmitri", "" ] ]
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802.0245
Eduardo V. Flores
Eduardo V. Flores
Reply to Comments of Steuernagel on the Afshar's Experiment
null
null
10.1007/s10701-008-9234-0
null
quant-ph
null
We respond to criticism of our paper "Paradox in Wave-Paricle Duality for Non-Perturbative Measurements". We disagree with Steuernagel's derivation of the visibility of the Afshar experiment. To calculate the fringe visibility, Steuernagel utilizes two different experimental situations, i.e. the wire grid in the pattern minima and in the pattern maxima. In our assessment, this proceduere cannot lead to the correct result for the complementarity properties of wave-particle in one particular experimental set-up.
[ { "version": "v1", "created": "Sat, 2 Feb 2008 12:15:35 GMT" } ]
2009-11-13T00:00:00
[ [ "Flores", "Eduardo V.", "" ] ]
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802.0246
Marco Thill
Marco Thill
Simplified proof of the Theorem of Varopoulos in the commutative case
null
null
null
null
math.RT
null
We give continuity properties of bitraces on (possibly non-commutative) Banach *-algebras based on the Closed Graph Theorem, leading to a simplified proof of the Theorem of Varopoulos in the commutative case.
[ { "version": "v1", "created": "Sat, 2 Feb 2008 14:26:15 GMT" }, { "version": "v2", "created": "Fri, 2 May 2008 07:22:59 GMT" } ]
2008-05-02T00:00:00
[ [ "Thill", "Marco", "" ] ]
[ 0.0373025499, -0.0020874944, -0.0281804241, -0.0093435943, 0.016592212, -0.0003069514, 0.0097685754, -0.0372067802, -0.0319872946, 0.0148444036, 0.0583241396, 0.0255706832, 0.0047256681, 0.0255706832, 0.0507103987, -0.0141380969, 0.0684279129, 0.0682363734, 0.0761374235, 0.0350998305, 0.0565523878, -0.0171189494, 0.1324503869, 0.0161253326, 0.0131085664, -0.0070091924, 0.0125578865, 0.0049621011, 0.0637351647, -0.0459458232, -0.0071408763, -0.0242418684, 0.0046119406, -0.0130606806, -0.0316999853, 0.1442301422, -0.0385236219, 0.0101516563, -0.0268635824, 0.1380050629, 0.0528173447, 0.0514286757, -0.065411143, 0.0261453036, 0.0920831859, 0.0798245817, 0.0438388772, 0.0031813711, -0.0570791252, 0.063208431, 0.0038367994, 0.0619634129, 0.0154190259, -0.0696729273, -0.0925620422, 0.080303438, -0.0445810966, 0.0713489056, 0.0406545103, -0.1576379836, 0.0369912945, -0.1187552288, 0.0568875857, -0.0508540533, -0.080303438, 0.0856665745, -0.0932803154, 0.0754670352, 0.0201237444, 0.0171428919, -0.1046769843, -0.0116121545, 0.091652222, 0.1148286462, -0.0303831417, -0.0013512598, -0.0370631255, 0.1285237968, 0.0213687588, 0.0090562832, 0.0366321579, -0.0032202778, 0.0979730636, 0.0473823771, 0.0987392291, -0.0348843485, -0.0360335931, 0.0850919485, -0.0420910679, -0.0435755067, 0.0229848828, -0.0193456095, 0.0316999853, 0.0588987619, 0.1261295527, -0.0454909131, -0.0123663461, -0.0102115134, -0.0486992225, -0.0234397929, -0.0006520614, -0.0195730645, 0.0953393802, -0.0704390928, 0.0659378842, 0.1202875525, 0.0078711249, 0.0361054204, -0.1162652001, 0.0216919836, -0.0646928698, 0.0027728507, 0.01453315, 0.1123386174, 0.0334956795, -0.0557862259, -0.0507103987, -0.095818229, 0.0855229199, 0.0287789889, -0.0214405861, -0.0552594885, -0.0282522514, -0.0164605286, 0.0423304923, -0.0174062606, -0.0121269198, -0.0965843946, 0.1107105166, -0.0539187044, 0.0083918767, -0.039648924, 0.0343576111, 0.0790105388, -0.123447977, -0.0158021078, -0.011193159, -0.0232482515, 0.029904291, 0.1022827327, 0.0059377616, -0.0086672166, 0.0314126723, -0.0106364936, -0.0704869777, 0.0476457477, -0.0552594885, 0.0369194672, 0.102570042, 0.0185315628, -0.016867552, -0.0338308737, 0.0562171936, 0.0683321431, -0.0432881974, -0.0985476822, -0.0213687588, 0.0652196035, 0.0479809418, -0.0584677942, 0.0817878768, 0.0680927187, -0.0056354865, 0.0188907012, 0.1059220061, -0.0604789741, -0.0576537475, 0.0379489996, 0.0039774622, -0.0522906072, 0.0605747439, 0.0314605571, -0.1092739627, -0.0245411508, -0.0599522367, -0.0300718881, -0.1263210922, -0.1474863291, 0.0579410605, -0.0807344019, -0.0164485574, 0.1118597612, 0.0236313324, -0.007350374, -0.0207821652, -0.0364885032, 0.0903114378, 0.0497526936, -0.032011237, -0.0122526186, -0.0622507259, 0.0463528484, 0.0530088879, 0.1056346893, 0.0714925602, -0.0918916464, 0.0055067949, 0.0784359127, -0.0599522367, -0.0195730645, 0.023104595, 0.0105347382, -0.0101696132, 0.0706785172, -0.004552084, -0.0817878768, 0.0668955892, -0.0304070842, -0.0247566346, -0.0057671703, -0.0426417477, -0.0385715067, -0.0465443879, 0.0072725606, -0.0165682696, 0.0173104908, 0.0262650177, 0.0910297111, 0.0675659776, 0.1435597539, -0.0520511828, -0.0027608795, 0.0732643157, 0.0421868376, 0.0221947785, 0.0804949775, 0.1194256246, -0.0093675368, 0.0704869777, 0.0419713557, 0.1513171494, 0.0157183073, -0.0443656109, -0.1116682217, 0.0557383411, -0.0139824701, 0.0298803486, -0.1186594591, 0.0131923649, -0.1597449332, -0.0027578867, 0.1117639914, 0.0436233915, 0.0029344633, -0.047933057, 0.0393855534, -0.0212729871, 0.091652222, -0.1135836318, 0.0863369703, -0.1453793794, 0.0482921973, -0.0179689117, 0.0354589708, -0.0432642549, -0.0507582836 ]
802.0247
Joanna Rankin M
Joanna M. Rankin and Geoffrey A.E. Wright
The `Periodic Nulls' of Radio Pulsar J1819+1305
8 pages, 9 figures
AIP Conf.Proc.983:91-93,2008
10.1063/1.2900328
null
astro-ph
null
We present a single-pulse study of the four-component pulsar J1819+1305, whose ``null'' pulses bunch at periodic intervals of around 57 times the rotation period. The emission bursts between the null bunches exhibit characteristic modulations at two shorter periodicities of approximately 6.2 and 3 times the rotation period, the former found largely in the two outer components, and the latter only in the first component. Many bursts commence with bright emission in second component, exhibit positive six-period drift across the full profile width, and end with 3-period modulation in the leading component. The 57-period cycle can be modelled geometrically as a sparsely filled subbeam carousel with nulls appearing whenever our line of sight intersects a circulating empty region. This interpretation is compatible with other recent evidence for periodic, carousel-related nulling and appears to support the physics of a polar-gap emission model for ``drifting'' subpulses, but the subtle structure of the emission bursts defies an easy explanation.
[ { "version": "v1", "created": "Sat, 2 Feb 2008 14:17:20 GMT" } ]
2009-06-23T00:00:00
[ [ "Rankin", "Joanna M.", "" ], [ "Wright", "Geoffrey A. E.", "" ] ]
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802.0248
Fatine Latif
Emmanuel Fricain (ICJ), Javad Mashreghi
Integral means of the derivatives of Blaschke products
null
null
null
null
math.CV math.FA
null
We study the rate of growth of some integral means of the derivatives of a Blaschke product and we generalize several classical results. Moreover, we obtain the rate of growth of integral means of the derivative of functions in the model subspace $K_B$ generated by the Blaschke product $B$
[ { "version": "v1", "created": "Sat, 2 Feb 2008 15:05:23 GMT" } ]
2008-02-05T00:00:00
[ [ "Fricain", "Emmanuel", "", "ICJ" ], [ "Mashreghi", "Javad", "" ] ]
[ 0.0493416116, 0.0195850506, 0.0615180843, 0.032519497, 0.046309717, -0.0719830021, 0.0289985873, 0.0407349467, 0.014866055, 0.0599043332, 0.0353313312, -0.0386077315, -0.0231915358, 0.0190715846, 0.0615669861, 0.1086591259, 0.0282895155, 0.0144381672, 0.073694557, 0.0227880981, 0.0357225426, -0.0945265964, 0.051346574, 0.0982431099, 0.0590730086, -0.0786336064, -0.1206888929, -0.0473366491, 0.0558455102, -0.007445253, 0.046847634, -0.0078120143, -0.0496105701, -0.0532537326, -0.0890007243, 0.1152119264, -0.0637186542, 0.1092459485, 0.0034322739, 0.1034755707, -0.0581927821, -0.0160030145, -0.1562891901, 0.1312516183, -0.0006246402, -0.0764330402, 0.0335464291, -0.0215900112, 0.053644944, 0.0784869045, -0.0506619513, 0.0352090783, -0.0026911106, -0.1120822355, -0.0467498302, 0.0369450822, -0.05486748, 0.0682175905, -0.0147927031, -0.0583394878, 0.010856132, -0.1232317761, 0.0239006076, -0.0224702377, -0.188075155, -0.0771665648, -0.0108744707, 0.0922282264, -0.0163942277, 0.062740624, -0.1049426123, 0.0681197867, 0.0501729362, 0.0774599686, -0.0045417268, 0.0649411902, 0.0112351188, 0.0442314036, 0.0068645477, 0.0222624075, 0.0928150415, 0.0689022094, 0.0573614575, 0.0540361553, 0.004841248, -0.0520800948, -0.0223479848, 0.0290963911, -0.1005414799, -0.0171888769, -0.0329596102, -0.0334730744, -0.0419819355, 0.0416640751, 0.1126690507, -0.0254043285, 0.0417618789, 0.026871372, 0.0600510389, 0.0506619513, 0.0261623021, 0.0516888835, 0.0563345253, -0.0573125556, 0.1667541116, 0.0499039777, 0.0437668413, 0.0023549127, -0.0769709572, -0.0194261204, 0.0031327521, -0.0453316867, -0.0542317592, -0.0083560431, 0.0041505145, -0.1233295798, -0.1111042053, -0.0030028576, -0.1695903987, 0.0462852679, -0.0186436959, -0.0379964635, 0.023423817, 0.0038295984, 0.1146251112, -0.0819589123, -0.0185825694, -0.0428132601, -0.0646477789, -0.1218625307, 0.0018124117, -0.0757973194, 0.02973211, -0.0562856235, -0.0158563107, -0.043937996, 0.0569702461, 0.0272381343, 0.1192218512, -0.006014884, -0.0432289243, 0.1088547334, -0.0131422775, 0.0074880417, -0.0611268729, 0.0009084981, -0.0541339591, -0.055405397, 0.0905655771, -0.0798072442, -0.0395124108, -0.0026804134, -0.0355513878, -0.1115932167, -0.0446959697, -0.0186803713, -0.0003931222, 0.0955046266, 0.0699780434, -0.0751615986, 0.0282161646, 0.1335010827, -0.040563792, -0.1108107939, -0.0007190048, 0.0500751324, -0.0449160263, -0.0035484149, -0.0418841317, -0.074085772, -0.0349156708, -0.0148782805, -0.0191693865, -0.1104195789, -0.0041749654, -0.0611757748, -0.0461874641, -0.0815676972, -0.0402948335, -0.0451849848, -0.0028393432, 0.0443781093, -0.0229592528, -0.024805285, 0.068413198, 0.1035733745, 0.0007239714, -0.011571317, -0.0715428889, 0.0288518835, -0.0015358126, 0.1285131425, 0.0539383516, -0.0642076656, 0.0583883896, -0.0701247454, 0.0378742106, 0.0105138216, -0.0245363265, 0.0624472126, 0.08464849, 0.0098781027, -0.0072251963, 0.0775088742, -0.0430333167, 0.0849907994, 0.0096152574, 0.0792204291, -0.0889029205, 0.0971183777, -0.0345489085, -0.0858221278, 0.0060057151, 0.06176259, -0.0295854062, 0.1657760739, -0.0937441736, 0.0238028038, -0.0298054628, 0.083963871, -0.0502218381, -0.0518844873, -0.0018429752, -0.0213455036, 0.0520800948, 0.0607845597, 0.0189860072, 0.0140958568, 0.0144626182, -0.0329351574, 0.1274373084, -0.0285340231, -0.0755528137, -0.0216755886, 0.039414607, -0.0076225209, 0.0242184661, -0.093157351, 0.0484858342, -0.1423033625, -0.003193879, 0.0424953997, 0.0033833724, -0.0033344708, 0.0045539518, 0.0135212643, -0.0415418223, -0.0046486985, -0.0584372878, -0.0016336157, -0.0631807372, 0.0011713437, 0.0544762686, 0.0245363265, -0.0276537966, 0.0099147782 ]
802.0249
Gerard Henry Edmond Duchamp
G. H. E. Duchamp (LIPN), P. Blasiak (IFJ-Pan), A. Horzela (IFJ-Pan), K. A. Penson (LPTMC), A. I. Solomon
Hopf Algebras in General and in Combinatorial Physics: a practical introduction
null
null
null
null
quant-ph cs.SC math.CO
null
This tutorial is intended to give an accessible introduction to Hopf algebras. The mathematical context is that of representation theory, and we also illustrate the structures with examples taken from combinatorics and quantum physics, showing that in this latter case the axioms of Hopf algebra arise naturally. The text contains many exercises, some taken from physics, aimed at expanding and exemplifying the concepts introduced.
[ { "version": "v1", "created": "Sat, 2 Feb 2008 15:06:41 GMT" } ]
2008-02-09T00:00:00
[ [ "Duchamp", "G. H. E.", "", "LIPN" ], [ "Blasiak", "P.", "", "IFJ-Pan" ], [ "Horzela", "A.", "", "IFJ-Pan" ], [ "Penson", "K. A.", "", "LPTMC" ], [ "Solomon", "A. I.", "" ] ]
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802.025
Jacques Sainte-Marie
Jacques Sainte-Marie (INRIA Rocquencourt), Marie-Odile Bristeau (INRIA Rocquencourt)
Derivation of a non-hydrostatic shallow water model; Comparison with Saint-Venant and Boussinesq systems
null
null
null
null
math.NA physics.class-ph
null
From the free surface Navier-Stokes system, we derive the non-hydrostatic Saint-Venant system for the shallow waters including friction and viscosity. The derivation leads to two formulations of growing complexity depending on the level of approximation chosen for the fluid pressure. The obtained models are compared with the Boussinesq models.
[ { "version": "v1", "created": "Sat, 2 Feb 2008 15:09:02 GMT" }, { "version": "v2", "created": "Fri, 15 Feb 2008 08:18:16 GMT" }, { "version": "v3", "created": "Mon, 18 Feb 2008 09:15:52 GMT" } ]
2008-02-18T00:00:00
[ [ "Sainte-Marie", "Jacques", "", "INRIA Rocquencourt" ], [ "Bristeau", "Marie-Odile", "", "INRIA\n Rocquencourt" ] ]
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802.0251
Fabrice Rossi
Fabrice Rossi (INRIA Rocquencourt / INRIA Sophia Antipolis, CEREMADE), Brieuc Conan-Guez (INRIA Rocquencourt / INRIA Sophia Antipolis, LITA)
Multi-Layer Perceptrons and Symbolic Data
null
Symbolic Data Analysis and the SODAS Software Wiley (Ed.) (2008) 373-391
null
null
cs.NE
null
In some real world situations, linear models are not sufficient to represent accurately complex relations between input variables and output variables of a studied system. Multilayer Perceptrons are one of the most successful non-linear regression tool but they are unfortunately restricted to inputs and outputs that belong to a normed vector space. In this chapter, we propose a general recoding method that allows to use symbolic data both as inputs and outputs to Multilayer Perceptrons. The recoding is quite simple to implement and yet provides a flexible framework that allows to deal with almost all practical cases. The proposed method is illustrated on a real world data set.
[ { "version": "v1", "created": "Sat, 2 Feb 2008 15:09:42 GMT" } ]
2008-02-05T00:00:00
[ [ "Rossi", "Fabrice", "", "INRIA Rocquencourt / INRIA Sophia Antipolis, CEREMADE" ], [ "Conan-Guez", "Brieuc", "", "INRIA Rocquencourt / INRIA Sophia Antipolis, LITA" ] ]
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802.0252
Fabrice Rossi
Brieuc Conan-Guez (LITA), Fabrice Rossi (INRIA Rocquencourt / INRIA Sophia Antipolis)
Acc\'el\'eration des cartes auto-organisatrices sur tableau de dissimilarit\'es par s\'eparation et \'evaluation
A para\^itre
REVUE DES NOUVELLES TECHNOLOGIES DE L'INFORMATION (2008)
null
null
cs.NE
null
In this paper, a new implementation of the adaptation of Kohonen self-organising maps (SOM) to dissimilarity matrices is proposed. This implementation relies on the branch and bound principle to reduce the algorithm running time. An important property of this new approach is that the obtained algorithm produces exactly the same results as the standard algorithm.
[ { "version": "v1", "created": "Sat, 2 Feb 2008 15:10:35 GMT" } ]
2008-02-05T00:00:00
[ [ "Conan-Guez", "Brieuc", "", "LITA" ], [ "Rossi", "Fabrice", "", "INRIA Rocquencourt / INRIA\n Sophia Antipolis" ] ]
[ 0.0412125178, 0.0336347297, 0.0833822265, -0.0774795339, 0.0089404574, -0.0834354013, 0.0148232114, -0.0522734225, -0.141132921, 0.0363201909, -0.0265754256, -0.1443235725, -0.0078636138, -0.0054739527, 0.0607818142, 0.0647701249, 0.0696092695, -0.0799788684, 0.0657804906, 0.059877798, 0.0208056737, -0.0708855316, 0.0841267109, 0.0170167815, 0.0766286924, -0.1112472042, 0.065674141, -0.0071058352, 0.041504994, -0.1367723793, 0.0017498701, -0.0632811561, 0.0308429152, -0.0003703726, -0.0821059644, 0.1124171093, 0.0022384378, 0.1166713014, -0.0861474499, 0.0626430213, -0.0723744929, 0.0153151024, -0.0266286042, 0.0875300691, 0.0396703705, -0.0158734657, -0.0014565634, -0.014570619, -0.0298325438, 0.0882745534, -0.0551981814, 0.0951344371, -0.0276788585, -0.0786494315, -0.0565807968, -0.0746611282, -0.0579634085, -0.0127160558, 0.0551981814, -0.0006264967, 0.074714303, -0.0889658555, 0.0253390502, 0.0185190439, -0.1103963628, 0.0746611282, -0.1141187847, -0.0304174963, 0.0018229891, 0.0032205586, -0.1215636283, 0.0264158938, 0.0867324024, -0.0848180205, 0.050119739, -0.0503590368, -0.0523797795, 0.0950280875, -0.0638661087, 0.0029164501, -0.0081228539, 0.0246211551, 0.0958257467, -0.0457325988, 0.0240229089, -0.1216699854, -0.0847648382, -0.0077040815, -0.0678012371, -0.060941346, -0.0690774918, 0.0998672321, 0.0154347522, 0.0440840982, 0.055783134, -0.0442702174, 0.0177346766, -0.0795534477, 0.0508376323, 0.0509971641, -0.0633343309, -0.0986973271, 0.0704069287, -0.0390322395, 0.1211382076, 0.0006597326, 0.0255517606, -0.0304972623, -0.0714704767, -0.0324914157, -0.0038320993, -0.0641851723, 0.0123969903, 0.0685457215, 0.1252860427, -0.1377295703, -0.0480458178, -0.0068200068, -0.0239298474, -0.0545600541, 0.0635470375, -0.0563680865, 0.0358150043, 0.076150097, 0.0224009976, -0.0757246763, 0.0543207563, -0.0556767806, -0.0012189266, -0.146344319, 0.0588674247, -0.0830631629, 0.0323584713, -0.0057963412, -0.025046574, -0.0253656395, -0.1160331741, -0.04068074, 0.0233316012, 0.0081893262, -0.0041611348, -0.0196357705, 0.0637065768, 0.0085150376, -0.0100372415, 0.021855928, -0.0337410867, 0.0648764744, -0.0709387064, 0.0360808931, 0.0017864297, -0.1391121894, 0.0543473437, 0.0152087482, -0.0056766919, -0.0597182661, -0.012064632, 0.0029779368, 0.0139059005, -0.0013551938, -0.0048790299, -0.0326775387, -0.0342196822, -0.0450412929, 0.0400957912, 0.0427014828, -0.0709918812, 0.0577507019, -0.0480458178, -0.0165381841, 0.0603563935, -0.1716567725, 0.0095785866, 0.0286360513, 0.0241957363, 0.0319330543, -0.073544398, -0.0367987901, -0.0461048409, 0.0057032807, -0.0139457835, 0.0147567401, 0.0708855316, 0.075671494, -0.0309758596, 0.0037589804, -0.0331029557, 0.0353364088, 0.0234379563, -0.006753535, -0.0603563935, 0.0287424065, 0.0351768769, 0.1431536674, 0.0499602035, -0.0168572478, 0.0795002729, 0.0303377304, -0.0624834932, 0.0324648283, 0.0477799289, -0.0748738348, 0.056314908, 0.016963603, 0.0100904191, 0.0455996543, 0.0298059545, -0.043180082, 0.0279979222, 0.0080364402, 0.0041245753, 0.0102433041, 0.0524063669, 0.0076376097, 0.0087011587, -0.0854029655, -0.1440045089, 0.0612604097, 0.0186253991, 0.0827440992, -0.0592396669, 0.0129752951, -0.0001067703, 0.0352832302, -0.0543207563, 0.0699283332, 0.0810955986, -0.1273067892, -0.0785962567, -0.1486841291, 0.1294338852, 0.1029515266, -0.0226137061, 0.0434459671, 0.0485510044, -0.0186785758, 0.0138926059, -0.0566871502, -0.0549322963, 0.0186918695, 0.0091996975, 0.0660463795, -0.0314278677, -0.0766818672, -0.0170699582, 0.0269609615, -0.0473545119, 0.051263053, -0.0651423633, -0.0917310864, 0.004799264, -0.0050252681, 0.0240893811, -0.1232653037, -0.0973147154, 0.1319864094 ]
802.0253
Junxian Wang
Junxian Wang, Peng Jiang, Hongyan Zhou, Tinggui Wang, Xiaobo Dong, and Huiyuan Wang (USTC)
XMM observations of BAL Quasars with polar outflows
11 pages, including 2 figures, ApJ letter accepted
null
10.1086/586893
null
astro-ph
null
We have selected a sample of broad absorption line (BAL) quasars which show significant radio variations, indicating the presence of polar BAL outflows. We obtained snapshot XMM observations of four polar BAL QSOs, to check whether strong X-ray absorption, one of the most prominent characteristics of most BAL QSOs, also exist in polar outflows. Two of the sources are detected in X-ray. Spectral fittings show that they are X-ray normal with no intrinsic X-ray absorption, suggesting the X-ray shielding gas might be absent in polar BAL outflows. Comparing to non-BAL QSOs, one of two X-ray nondetected sources remains consistent with X-ray normal, while the other one, which is an iron low-ionization BAL (FeLoBAL), shows an X-ray weakness factor of > 19, suggesting strong intrinsic X-ray absorption. Alternative explanations to the nondetection of strong X-ray absorption in the two X-ray detected sources are 1) the absorption is more complex than a simple neutral absorber, such as partial covering absorption or ionized absorption; 2) there might be significant jet contribution to the detected X-ray emission. Current data is insufficient to test these possibilities, and further observations are required to understand the X-ray nature of polar BAL outflows.
[ { "version": "v1", "created": "Sat, 2 Feb 2008 15:20:41 GMT" } ]
2009-11-13T00:00:00
[ [ "Wang", "Junxian", "", "USTC" ], [ "Jiang", "Peng", "", "USTC" ], [ "Zhou", "Hongyan", "", "USTC" ], [ "Wang", "Tinggui", "", "USTC" ], [ "Dong", "Xiaobo", "", "USTC" ], [ "Wang", "Huiyuan", "", "USTC" ] ]
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802.0254
Krzysztof Gozdziewski
K. Gozdziewski, C. Migaszewski and A. Musielinski
Stability constraints in modeling of multi-planet extrasolar systems
13 pages, to appear in the Proceedings of IAU Symposium 249, Suzhou (China) "Exoplanets: Detection, Formation and Dynamics", eds. Y.-S. Sun, S. Ferraz-Mello, J.-L. Zhou. Please download pdf for acceptable quality of figures (see also http://www.astri.uni.torun.pl/~chris/iau249.pdf)
null
null
null
astro-ph
null
We present an analysis of high precision radial velocity (RV) observations of stars hosting multi-planet systems with Jovian companions. We use dynamical stability constraints and quasi-global methods of optimization. As an illustration, we present new results derived for the RV data of the Sun-like dwarfs HD 155358 and $\tau^1$ Gruis.
[ { "version": "v1", "created": "Sat, 2 Feb 2008 15:49:51 GMT" } ]
2008-02-05T00:00:00
[ [ "Gozdziewski", "K.", "" ], [ "Migaszewski", "C.", "" ], [ "Musielinski", "A.", "" ] ]
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802.0255
Sergio Palomares-Ruiz
Davide Meloni (Rome III U.), Olga Mena (INFN, Rome & Rome U.), Christopher Orme, Sergio Palomares-Ruiz and Silvia Pascoli (Durham U., IPPP)
An intermediate gamma beta-beam neutrino experiment with long baseline
23 pp, 5 figs
JHEP 0807:115,2008
10.1088/1126-6708/2008/07/115
RM3-TH/08-4, Roma-TH-1465, IPPP/07/100, DCPT/07/200
hep-ph
null
In order to address some fundamental questions in neutrino physics a wide, future programme of neutrino oscillation experiments is currently under discussion. Among those, long baseline experiments will play a crucial role in providing information on the value of theta13, the type of neutrino mass ordering and on the value of the CP-violating phase delta, which enters in 3-neutrino oscillations. Here, we consider a beta-beam setup with an intermediate Lorentz factor gamma=450 and a baseline of 1050 km. This could be achieved in Europe with a beta-beam sourced at CERN to a detector located at the Boulby mine in the United Kingdom. We analyse the physics potential of this setup in detail and study two different exposures (1 x 10^{21} and 5 x 10^{21} ions-kton-years). In both cases, we find that the type of neutrino mass hierarchy could be determined at 99% CL, for all values of delta, for sin^2(2 theta13) > 0.03. In the high-exposure scenario, we find that the value of the CP-violating phase delta could be measured with a 99% CL error of ~20 deg if sin^2 (2 theta13) > 10^{-3}, with some sensitivity down to values of sin^2(2 theta13) ~ 10^{-4}. The ability to determine the octant of theta23 is also studied, and good prospects are found for the high-statistics scenario.
[ { "version": "v1", "created": "Sat, 2 Feb 2008 15:52:03 GMT" } ]
2009-03-19T00:00:00
[ [ "Meloni", "Davide", "", "Rome III U." ], [ "Mena", "Olga", "", "INFN, Rome & Rome U." ], [ "Orme", "Christopher", "", "Durham U., IPPP" ], [ "Palomares-Ruiz", "Sergio", "", "Durham U., IPPP" ], [ "Pascoli", "Silvia", "", "Durham U., IPPP" ] ]
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802.0256
S. I. Kruglov
S. I. Kruglov
Quantization of bosonic fields with two mass and spin states
9 pages
Mod.Phys.Lett.A23:2141-2147,2008
10.1142/S0217732308027370
null
hep-th
null
We investigate bosonic fields possessing two mass and spin states. The density matrix in the first order formalism is obtained. The quantization of fields in the first order formulation is performed and propagators are found.
[ { "version": "v1", "created": "Sat, 2 Feb 2008 15:56:07 GMT" } ]
2008-11-07T00:00:00
[ [ "Kruglov", "S. I.", "" ] ]
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802.0257
Markus Perling
Markus Perling, Guenther Trautmann
Equivariant Primary Decomposition and Toric Sheaves
35 pages, requires packages ams*, enumerate, xy; partially rewritten, includes primary decomposition for general varieties admitting a homogeneous coordinate ring. to appear in manuscripta math
manuscripta math. 132(1-2), 103-143, 2010
null
null
math.AG math.AC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study global primary decompositions in the category of sheaves on a scheme which are equivariant under the action of an algebraic group. We show that equivariant primary decompositions exist if the group is connected. As main application we consider the case of varieties which are quotients of a quasi-affine variety by the action of a diagonalizable group and thus admit a homogeneous coordinate ring, such as toric varieties. Comparing these decompositions with primary decompositions of graded modules over the homogeneous coordinate ring, we show that these are equivalent if the action of the diagonalizable group is free. We give some specific examples for the case of toric varieties.
[ { "version": "v1", "created": "Sat, 2 Feb 2008 16:19:28 GMT" }, { "version": "v2", "created": "Thu, 21 Jan 2010 10:48:40 GMT" } ]
2012-01-30T00:00:00
[ [ "Perling", "Markus", "" ], [ "Trautmann", "Guenther", "" ] ]
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802.0258
Aymeric Fouquier d'Herouel
Aymeric Fouquier d'H\'erou\"el
QPS -- quadratic programming sampler, a motif finder using biophysical modeling
5 pages, 3 figures
null
null
null
q-bio.QM q-bio.GN
null
We present a Markov chain Monte Carlo algorithm for local alignments of nucleotide sequences aiming to infer putative transcription factor binding sites, referred to as the quadratic programming sampler. The new motif finder incorporates detailed biophysical modeling of the transcription factor binding site recognition which arises an intrinsic threshold discriminating putative binding sites from other/background sequences. We validate the principal functioning of the algorithm on a sample of four promoter regions from Escherichia coli. The resulting description of the motif can be readily evaluated on the whole genome to identify new putative binding sites.
[ { "version": "v1", "created": "Sat, 2 Feb 2008 16:57:58 GMT" } ]
2008-02-05T00:00:00
[ [ "d'Hérouël", "Aymeric Fouquier", "" ] ]
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802.0259
Dmitry Anchishkin
Dmitry Anchishkin (Bogolyubov Institute for Theoretical Physics, Kiev) and Stanislav Yezhov (Taras Shevchenko Kyiv National University, Kiev)
Thermalization in Heavy-Ion Collisions
12 pages, 4 figures; added references, corrected typos, added explanatory figures, extended discussion
Ukr.J.Phys.53:87-97,2008
null
null
nucl-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We propose a model for isotropization and corresponding thermalization in a nucleon system created in the collision of two nuclei. The model is based on the assumption: during the fireball evolution, two-particle elastic and inelastic collisions give rise to the randomization of the nucleon-momentum transfer which is driven by a proper distribution. As a first approximation, we assume a homogeneous distribution where the values of the momentum transfer is bounded from above. These features have been shown to result in a smearing of the particle momenta about their initial values and, as a consequence, in their partial isotropization and thermalization. The nonequilibrium single-particle distribution function and single-particle spectrum which carry a memory about initial state of nuclei have been obtained.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 16:55:19 GMT" }, { "version": "v2", "created": "Sat, 16 Aug 2008 16:03:29 GMT" } ]
2008-11-26T00:00:00
[ [ "Anchishkin", "Dmitry", "", "Bogolyubov Institute for Theoretical Physics, Kiev" ], [ "Yezhov", "Stanislav", "", "Taras Shevchenko Kyiv National University, Kiev" ] ]
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802.026
Ritabrata Sengupta
L. Jeganathan, R. Rama, Ritabrata Sengupta
A proposal to a generalised splicing with a self assembly approach
8 pages, 3 figures
null
null
null
cs.DM
null
Theory of splicing is an abstract model of the recombinant behaviour of DNAs. In a splicing system, two strings to be spliced are taken from the same set and the splicing rule is from another set. Here we propose a generalised splicing (GS) model with three components, two strings from two languages and a splicing rule from third component. We propose a generalised self assembly (GSA) of strings. Two strings $u_1xv_1$ and $u_2xv_2$ self assemble over $x$ and generate $u_1xv_2$ and $u_2xv_1$. We study the relationship between GS and GSA. We study some classes of generalised splicing languages with the help of generalised self assembly.
[ { "version": "v1", "created": "Sat, 2 Feb 2008 17:12:45 GMT" } ]
2008-02-05T00:00:00
[ [ "Jeganathan", "L.", "" ], [ "Rama", "R.", "" ], [ "Sengupta", "Ritabrata", "" ] ]
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802.0261
Andrew Haas
Andrew Haas
Geodesic excursions into an embedded disc on a hyperbolic Riemann surface
5 pages
Conform. Geom. Dyn. 13 (2009), 1-5.
null
null
math.GT math.DS
null
We calculate the asymptotic average rate at which a generic geodesic on a finite area hyperbolic 2-orbifold returns to an embedded disc on the surface, as well as the average amount of time it spends in the disc during each visit. This includes the case where the center of the disc is a cone point.
[ { "version": "v1", "created": "Sat, 2 Feb 2008 17:18:56 GMT" } ]
2009-04-21T00:00:00
[ [ "Haas", "Andrew", "" ] ]
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802.0262
Robert Seaman
Robert Seaman
Thread Safe Astronomy
4 pages, 1 figure, to appear in proceedings of Hot-wiring the Transient Universe (HTU) 2007, Astronomische Nachrichten, March 2008
null
10.1002/asna.200710960
null
astro-ph
null
Observational astronomy is the beneficiary of an ancient chain of apprenticeship. Kepler's laws required Tycho's data. As the pace of discoveries has increased over the centuries, so has the cadence of tutelage (literally, "watching over"). Naked eye astronomy is thousands of years old, the telescope hundreds, digital imaging a few decades, but today's undergraduates will use instrumentation yet unbuilt - and thus, unfamiliar to their professors - to complete their doctoral dissertations. Not only has the quickening cadence of astronomical data-taking overrun the apprehension of the science within, but the contingent pace of experimental design threatens our capacity to learn new techniques and apply them productively. Virtual technologies are necessary to accelerate our human processes of perception and comprehension to keep up with astronomical instrumentation and pipelined dataflows. Necessary, but not sufficient. Computers can confuse us as efficiently as they illuminate. Rather, as with neural pathways evolved to meet competitive ecological challenges, astronomical software and data must become organized into ever more coherent "threads" of execution. These are the same threaded constructs as understood by computer science. No datum is an island.
[ { "version": "v1", "created": "Sat, 2 Feb 2008 17:47:16 GMT" } ]
2009-11-13T00:00:00
[ [ "Seaman", "Robert", "" ] ]
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802.0263
Stefano Ettori
Stefano Ettori, Fabrizio Brighenti
On the evolution of cooling cores in X-ray galaxy clusters
8 pages. MNRAS in press
null
10.1111/j.1365-2966.2008.13054.x
null
astro-ph
null
(Abridged) To define a framework for the formation and evolution of the cooling cores in X-ray galaxy clusters, we study how the physical properties change as function of the cosmic time in the inner regions of a 4 keV and 8 keV galaxy cluster under the action of radiative cooling and gravity only. The cooling radius, R_cool, defined as the radius at which the cooling time equals the Universe age at given redshift, evolves from ~0.01 R200 at z>2, where the structures begin their evolution, to ~0.05 R200 at z=0. The values measured at 0.01 R200 show an increase of about 15-20 per cent per Gyr in the gas density and surface brightness and a decrease with a mean rate of 10 per cent per Gyr in the gas temperature. The emission-weighted temperature diminishes by about 25 per cent and the bolometric X-ray luminosity rises by a factor ~2 after 10 Gyrs when all the cluster emission is considered in the computation. On the contrary, when the core region within 0.15 R500 is excluded, the gas temperature value does not change and the X-ray luminosity varies by 10-20 per cent only. The cooling time and gas entropy radial profiles are well represented by power-law functions. The behaviour of the inner slopes of the gas temperature and density profiles are the most sensitive and unambiguous tracers of an evolving cooling core. Their values after 10 Gyrs of radiative losses, T_gas ~ r^0.4 and n_gas ~ r^(-1.2) for the hot (cool) object, are remarkably in agreement with the observational constraints available for nearby X-ray luminous cooling core clusters. Because our simulations do not consider any AGN heating, they imply that the feedback process does not greatly alter the gas density and temperature profiles as generated by radiative cooling alone.
[ { "version": "v1", "created": "Sat, 2 Feb 2008 18:13:26 GMT" } ]
2009-11-13T00:00:00
[ [ "Ettori", "Stefano", "" ], [ "Brighenti", "Fabrizio", "" ] ]
[ 0.0758174062, 0.0059730099, 0.0739060417, -0.0185500253, 0.0467303805, 0.0988517851, 0.0543023199, 0.0020109133, -0.0095016807, -0.0369040109, 0.0096548349, 0.0254603382, -0.1375201344, -0.054400336, 0.0301897377, 0.0337674171, -0.0110699786, 0.0263180006, -0.0549884476, 0.1329132617, -0.1224252656, -0.0986557454, 0.0611636229, 0.0528810471, -0.0981656536, -0.0303122606, 0.0604284815, 0.0913043469, 0.0036542569, -0.0878246874, -0.0135633275, -0.0165038854, 0.0112231327, -0.043569278, -0.0624378659, 0.1238955408, 0.0444514453, -0.0123258419, -0.075572364, -0.0038901141, -0.0306798294, 0.0115478197, -0.0654764399, 0.0523419455, -0.0195179582, -0.0337674171, -0.0003985836, -0.0727298185, 0.0821886212, -0.0071982429, -0.1053700224, 0.0062578768, 0.0200325567, -0.1416369081, -0.1535951942, 0.0309248772, 0.0331793055, 0.0179251563, 0.0171532594, -0.025778899, -0.020988239, -0.0678288862, 0.0396730378, -0.090618223, 0.0164181199, -0.0676818639, -0.0047722817, 0.0166509133, 0.0534201525, 0.0711125135, -0.0025883045, -0.0789049938, 0.0445004553, -0.0005942379, 0.0527340211, -0.0402121432, 0.0184029974, -0.0621438101, 0.0105492547, -0.0032928132, -0.0023356001, 0.0413883664, 0.0846880898, -0.011106736, 0.0289399996, -0.0439123437, 0.0045394874, 0.0317335315, -0.0693971887, 0.0169817265, 0.0191013794, -0.0039207451, 0.0142862145, -0.0557725988, 0.0567037761, -0.1211510226, 0.0621438101, -0.0062456243, 0.1444794536, 0.0374676213, -0.0447700061, -0.0055104848, 0.0232794229, -0.1374221146, 0.1237975284, 0.0559686348, -0.1469299197, 0.0207799487, -0.0119582722, -0.0923335478, 0.0725337863, 0.0424910747, -0.066358611, 0.0323216431, -0.1070363373, -0.0152173918, -0.1049779505, 0.0268816091, -0.1047819108, 0.0220664442, -0.0073575233, -0.0013967655, -0.0288419817, 0.1059581339, 0.0200203042, -0.1213470623, 0.0914513767, -0.106840305, -0.1074284166, -0.0007500722, 0.0482986793, -0.1060561538, 0.054057274, 0.0024719073, -0.0807673484, -0.1076244488, -0.0127424216, -0.0305328015, -0.0194321927, 0.015548205, -0.047367502, 0.0108433105, 0.0139676547, 0.0661625713, 0.0793460757, 0.1407547444, -0.0885108188, 0.0672407746, 0.0060342718, 0.0213190503, 0.0501855351, -0.0304837935, -0.0359973423, -0.0279598124, 0.0290135127, -0.0427361205, 0.0481271446, 0.0900301114, -0.0159035213, -0.0858643129, -0.0450150557, -0.0069593224, -0.1024294645, -0.0090544708, 0.0745921731, 0.0069715749, -0.0382517688, 0.0791010335, -0.160162434, -0.0381047428, 0.0146660367, -0.0477840789, -0.0245291609, -0.0018041553, 0.0238307789, 0.1176223531, 0.0356297716, -0.0902751535, -0.0260239448, 0.082629703, -0.0262934957, -0.0032284886, 0.0376391523, 0.0013339722, -0.0711615235, -0.0591052324, -0.0675348341, 0.001007754, -0.0042025484, -0.0289890096, -0.0911573246, 0.0564587303, -0.0321991183, 0.0342330039, -0.0971854702, -0.0927746296, 0.0039299345, -0.0429076552, 0.0190523714, 0.0799341872, 0.0668977126, 0.1329132617, 0.0593992881, -0.0337184072, 0.0022069507, -0.040702235, 0.0355317518, 0.0604284815, -0.0672897846, -0.0183539875, 0.0436918028, 0.0156707279, -0.0147272982, 0.0333263315, -0.0761114657, -0.0090054609, -0.0982146636, 0.0811594203, 0.0840999782, 0.0657704994, 0.012926206, 0.1182104647, 0.058223065, 0.1258559227, 0.0702303424, -0.0428341404, 0.0171287544, -0.0835608765, 0.0429321565, 0.0423930548, -0.0015537484, 0.0778267905, -0.0891479403, -0.0877266675, 0.0266120564, -0.0225810409, -0.0341349877, 0.0606735311, 0.0534201525, -0.0145925228, -0.1393824816, 0.0296751391, -0.0821886212, 0.0058749914, -0.056752786, 0.0452355966, -0.0374431163, 0.0031151546, 0.0349926502, 0.0116887214, 0.0235979836, -0.1296786368, -0.010481867, -0.0684169978, -0.0198855288, -0.0133060282 ]
802.0264
S\'ilvio Duarte Queir\'os M.
Sabir Umarov, Silvio M. Duarte Queiros
Functional-differential equations for $F_q$%-transforms of $q$-Gaussians
14 pages A new section on a related solution of the porous medium equation in comparison with the previous version has been introduce
J. Phys. A: Math. Theor. 43, 095202 (2010)
10.1088/1751-8113/43/9/095202
null
cond-mat.stat-mech math-ph math.FA math.MP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In the paper the question - Is the q-Fourier transform of a q-Gaussian a q'-Gaussian (with some q') up to a constant factor? - is studied for the whole range of $q\in (-\infty, 3)$. This question is connected with applicability of the q-Fourier transform in the study of limit processes in nonextensive statistical mechanics. We prove that the answer is affirmative if and only if q > 1, excluding two particular cases of q<1, namely, q = 1/2 and q = 2/3, which are also out of the theory valid for q \ge 1. We also discuss some applications of the q-Fourier transform to nonlinear partial differential equations such as the porous medium equation.
[ { "version": "v1", "created": "Sat, 2 Feb 2008 18:20:46 GMT" }, { "version": "v2", "created": "Tue, 8 Sep 2009 15:45:55 GMT" } ]
2010-02-24T00:00:00
[ [ "Umarov", "Sabir", "" ], [ "Queiros", "Silvio M. Duarte", "" ] ]
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802.0265
Peter B. Gilkey
Peter B. Gilkey and Stana Nikcevic
Geometrical representations of equiaffine curvature operators
null
null
null
null
math.DG
null
We examine geometric representability results for various classes of equiaffine curvature operators. We show every Ricci flat algebraic curvature operator is geometrically realizable by a Ricci flat torsion free connection on the tangent bundle of some smooth manifold.
[ { "version": "v1", "created": "Sat, 2 Feb 2008 18:48:53 GMT" } ]
2008-02-05T00:00:00
[ [ "Gilkey", "Peter B.", "" ], [ "Nikcevic", "Stana", "" ] ]
[ -0.0151669793, 0.0199051332, -0.0563693866, 0.0235442314, 0.0801578537, 0.0369038731, -0.0897807032, -0.0396637283, -0.0765920207, -0.0611563884, 0.013115407, -0.0915391892, 0.0437668711, 0.0459405594, 0.0545132011, -0.0254736859, 0.0448170789, -0.0279404577, 0.0575905591, 0.1389207393, 0.0108134942, -0.0487248376, 0.0876802802, 0.0069973264, 0.0071133375, -0.021871224, 0.0551970601, 0.0294302907, 0.0454520918, -0.0274764113, 0.000136428, 0.0013379486, -0.0503123626, -0.0997943282, -0.0982312262, 0.1751651764, 0.0217246823, -0.0002526303, 0.018012315, 0.0614983141, 0.0034589749, 0.0880710557, -0.0148861092, -0.0601305999, -0.0055136001, 0.0702419207, 0.1003316417, 0.0757127777, -0.0141534051, -0.0431562848, -0.0757616237, -0.0123643856, 0.0427899323, -0.1984163225, -0.0435959063, 0.0524127819, -0.0356094278, -0.0358536653, -0.0114485053, -0.0919788182, 0.0218223762, -0.0239472184, -0.0801090077, 0.0082123941, -0.1370645463, 0.0239227954, -0.1231920198, 0.0472105816, -0.0074125254, -0.0279160347, -0.0817209557, 0.0672134086, 0.0507031381, 0.0631591156, 0.0410802886, -0.0722934902, 0.0320924483, 0.1252435893, 0.005196095, -0.0204912964, 0.0977916047, 0.0952515602, 0.0474792384, -0.0266460143, 0.01917243, -0.0585674979, -0.0199906155, -0.0745892972, -0.0367084853, 0.1168419123, 0.0744916052, 0.1038486212, 0.007290408, 0.0465267226, 0.1599249244, 0.0132863717, 0.0788389817, 0.0264506266, 0.0591536611, -0.0340707488, 0.0014165617, 0.0050587128, 0.0483096391, -0.0274764113, 0.1791706234, 0.1160603613, -0.0068385736, -0.0056357174, 0.0476990491, 0.0453055501, -0.0778620467, 0.0034528691, -0.0754685476, 0.0132253133, 0.0761035532, 0.0169498939, -0.0741496757, -0.0586163439, -0.0646733642, 0.0228847973, -0.0915880427, -0.0738565922, 0.0029552407, -0.0221887287, 0.1074633002, -0.0372458026, -0.0498971641, -0.0580790304, -0.0435959063, -0.0572974756, 0.0946165472, -0.0123949144, 0.0991104692, -0.0637452751, 0.0162416119, 0.0641848966, 0.0159485303, -0.0607656129, 0.0709746256, 0.1150834262, -0.0003400206, 0.0787412897, -0.0175604802, -0.0392729528, 0.0830398202, 0.0440599546, -0.0750289187, 0.0367084853, 0.0778132007, 0.0258400384, -0.0823071152, 0.0648687556, 0.0117782215, -0.0363421328, -0.1362829953, -0.0926626697, -0.0034345514, -0.0511427596, 0.0446216911, 0.0020149369, 0.0219322816, 0.1114687473, 0.0099953078, 0.0665295497, 0.0615960099, -0.0247043464, -0.0593002029, -0.0278183408, -0.0469419248, -0.1184050143, 0.0208454374, -0.0985243097, -0.1694012433, -0.0354873128, 0.0248508882, 0.0729773492, 0.0362932868, -0.1352083683, -0.0192701239, -0.0129932901, -0.0017462786, 0.0669691712, 0.0092503922, -0.0313597433, -0.0164369997, 0.1076586843, -0.0132741602, 0.00653328, 0.0192334875, -0.0158264134, -0.1025786027, 0.1114687473, 0.0186595358, 0.0385890938, -0.0275008362, -0.0981335342, -0.0416908748, -0.0580790304, 0.0539270379, -0.0409337468, 0.0585674979, 0.012120151, 0.0934442207, -0.0340463258, -0.0232389383, -0.0499948561, 0.0919299647, 0.0409581698, -0.0870941207, 0.020332545, 0.0040146089, 0.0446216911, 0.0002713296, 0.0910507217, -0.0387600586, 0.0721469522, -0.0050953478, 0.1079517677, 0.0092503922, 0.1303236783, -0.0957888737, 0.0656014606, 0.0116194692, -0.0178413503, -0.0629637241, -0.0136771472, -0.0271589067, -0.0913438052, -0.0228481628, -0.0230923984, 0.0027720646, -0.0533408746, -0.0412756763, 0.0375633091, 0.0034742397, 0.0076628658, -0.0149105331, -0.0076628658, 0.0046984665, -0.0074064196, 0.0542689674, 0.0287708566, -0.0356094278, -0.0499460101, -0.0154478494, 0.0295768306, -0.0730750412, 0.0402987376, -0.020308122, -0.0064661154, -0.0135061825, 0.0713165551, -0.0411535576, 0.0365863703, -0.0475036614, 0.0693626776 ]
802.0266
Wlodek Bryc
Marek Bozejko, Wlodzimierz Bryc
A quadratic regression problem for two-state algebras with application to the Central Limit Theorem
null
Infinite Dimensional Analysis, Quantum Probability and Related Topics, 12 (2009), 231-249
null
null
math.OA math.PR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We extend a free version of the Laha-Lukacs theorem to probability spaces with two-states. We then use this result to generalize a noncommutative CLT of Kargin to the two-state setting.
[ { "version": "v1", "created": "Sat, 2 Feb 2008 18:58:44 GMT" }, { "version": "v2", "created": "Mon, 26 Jan 2009 22:10:05 GMT" } ]
2009-07-31T00:00:00
[ [ "Bozejko", "Marek", "" ], [ "Bryc", "Wlodzimierz", "" ] ]
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802.0267
Alexander Zhidenko
R. A. Konoplya, A. Zhidenko
(In)stability of D-dimensional black holes in Gauss-Bonnet theory
8 pages, 6 figures, 3 tables
Phys.Rev.D77:104004,2008
10.1103/PhysRevD.77.104004
null
hep-th gr-qc
null
We make an extensive study of evolution of gravitational perturbations of D-dimensional black holes in Gauss-Bonnet theory. There is an instability at higher multi-poles $\ell$ and large Gauss-Bonnet coupling $\alpha$ for $D= 5, 6$, which is stabilized at higher $D$. Although small negative gap of the effective potential for scalar type of gravitational perturbations, exists for higher $D$ and whatever $\alpha$, it does not lead to any instability.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 14:11:07 GMT" } ]
2008-11-26T00:00:00
[ [ "Konoplya", "R. A.", "" ], [ "Zhidenko", "A.", "" ] ]
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802.0268
Rajarshi Chakrabarti
Rajarshi Chakrabarti
Transient State Work Fluctuation Theorem for a Driven Classical System
null
null
10.1007/s12043-009-0060-5
null
cond-mat.stat-mech
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We derive the nonequilibrium transient state work fluctuation theorem and also the Jarzynski equality for a classical harmonic oscillator linearly coupled to a harmonic heat bath, which is dragged by an external agent. Coupling with the bath makes the dynamics not only dissipative but also non-Markovian in general. Since we do not assume anything about the spectral nature of the harmonic bath the derivation is not only restricted to the Markovian bath rather it is more general, for a non-Markovian bath.
[ { "version": "v1", "created": "Sun, 3 Feb 2008 15:20:05 GMT" } ]
2012-07-09T00:00:00
[ [ "Chakrabarti", "Rajarshi", "" ] ]
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802.0269
Mikhail Kozlov
M. G. Kozlov, S. G. Porsev, S. A. Levshakov, D. Reimers, and P. Molaro
Mid- and far-infrared fine-structure line sensitivities to hypothetical variability of the fine-structure constant
RevTeX4, 7 pages, submitted to PRA; v2: results for light ions (Z<10) have changed
PRA, 77, 032119 (2008)
10.1103/PhysRevA.77.032119
null
astro-ph physics.atom-ph
null
Sensitivity coefficients to temporal variation of the fine-structure constant alpha for transitions between the fine-structure (FS) sub-levels of the ground states of C I, Si I, S I, Ti I, Fe I, N II, Fe II, O III, S III, Ar III, Fe III, Mg V, Ca V, Na VI, Fe VI, Mg VII, Si VII, Ca VII, Fe VII, and Si IX are calculated. These transitions lie in the mid- and far-infrared regions and can be observed in spectra of high-redshift quasars and infrared bright galaxies with active galactic nuclei. Using FS transitions to study alpha-variation over cosmological timescale allows to improve the limit on $|\Delta\alpha/\alpha|$ by several times as compared to contemporaneous optical observations ($|\Delta\alpha/\alpha| < 10^{-5}$), and to suppress considerably systematic errors of the radial velocity measurements caused by the Doppler noise. Moreover, the far infrared lines can be observed at redshifts z > 10, far beyond the range accessible to optical observations (z < 4). We have derived a simple analytical expression which relates the FS intervals and the sensitivity of the FS transitions to the change of alpha.
[ { "version": "v1", "created": "Sun, 3 Feb 2008 20:25:11 GMT" }, { "version": "v2", "created": "Mon, 3 Mar 2008 23:51:12 GMT" } ]
2009-09-01T00:00:00
[ [ "Kozlov", "M. G.", "" ], [ "Porsev", "S. G.", "" ], [ "Levshakov", "S. A.", "" ], [ "Reimers", "D.", "" ], [ "Molaro", "P.", "" ] ]
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802.027
Mohamad Ali Jafarizadeh
M. A. Jafarizadeh, Y. Akbari, N. Behzadi
Two-qutrit Entanglement Witnesses and Gell-Mann Matrices
25 pages
null
10.1140/epjd/e2008-00041-3
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The Gell-Mann $\lambda$ matrices for Lie algebra su(3) are the natural basis for the Hilbert space of Hermitian operators acting on the states of a three-level system(qutrit). So the construction of EWs for two-qutrit states by using these matrices may be an interesting problem. In this paper, several two-qutrit EWs are constructed based on the Gell-Mann matrices by using the linear programming (LP) method exactly or approximately. The decomposability and non-decomposability of constructed EWs are also discussed and it is shown that the $\lambda$-diagonal EWs presented in this paper are all decomposable but there exist non-decomposable ones among $\lambda$-non-diagonal EWs.
[ { "version": "v1", "created": "Sun, 3 Feb 2008 15:29:58 GMT" } ]
2009-11-13T00:00:00
[ [ "Jafarizadeh", "M. A.", "" ], [ "Akbari", "Y.", "" ], [ "Behzadi", "N.", "" ] ]
[ -0.0606638975, -0.0012272296, 0.0683631524, -0.0242603924, -0.0659862012, -0.0338198654, -0.1089263186, 0.0418291539, -0.087430425, 0.0932694525, 0.0371785983, -0.0630408525, -0.0036526229, 0.0572534911, 0.0296085291, 0.0388838015, 0.0486241318, -0.0497867689, -0.007376296, 0.0776642561, -0.0394522026, -0.0452395603, 0.0148817739, -0.0096305227, 0.0015114301, 0.0457821265, 0.0306161493, -0.0210954323, -0.0022558419, -0.037566144, 0.0966798589, -0.0306936596, 0.0493217148, -0.1000902653, -0.0518795177, 0.1402400583, 0.050122641, 0.0275157802, -0.0755456761, 0.1303188652, 0.0152951572, -0.0265598334, -0.1151270568, -0.0464538708, 0.072910361, -0.0024544592, -0.035602577, 0.1006069928, -0.0001603674, -0.0574085116, 0.033742357, 0.0620073937, -0.0236274004, 0.043069303, 0.018783072, -0.0372561067, -0.1295954436, 0.1165739, 0.0311845504, -0.0947162956, -0.0001659182, -0.0436118655, 0.0236015636, 0.1156437844, -0.0637642667, -0.0497092605, -0.032269679, 0.0463246889, 0.0174912512, 0.0488049835, -0.0412865877, 0.0328897536, 0.0770441815, 0.0416741334, 0.0846400931, -0.0137578901, -0.0267923605, 0.0152564021, -0.0470222719, 0.0000137634, -0.0079705333, -0.0254747029, -0.0312103871, 0.0254488681, 0.0105864704, -0.0264823232, -0.0121624917, -0.0030535411, -0.0780259669, -0.0266890153, 0.0067497632, -0.0693449304, 0.0296860393, 0.0007298787, 0.0223097429, -0.093992874, 0.1056192592, 0.0155406026, -0.091564253, 0.0097015733, 0.0151272202, 0.0170649514, 0.0920809805, 0.0177883711, 0.0886188969, -0.0487791486, 0.0246608574, 0.0606122278, -0.0094819637, 0.0570468009, -0.0853118375, -0.0507168807, 0.0080997152, -0.0442577749, 0.0574601851, -0.0723936334, -0.0534297042, -0.1103731617, -0.0013539896, 0.10437911, 0.0003477823, -0.0789560825, 0.1276318878, -0.0103345653, 0.015889395, -0.0233819541, -0.0454979241, -0.149437815, 0.0078413514, 0.1104765013, 0.1228779852, 0.0382120572, 0.0775092393, -0.0400206037, -0.0498126037, 0.0421908647, 0.1489210874, -0.0535847209, 0.0881021693, -0.0048572458, 0.07260032, -0.0479782186, -0.0106510613, -0.0031568867, -0.0017261953, 0.1053092182, -0.033742357, 0.0245187562, 0.0274899434, -0.0309778601, -0.0649010688, -0.0363776684, 0.0716185346, -0.0192610454, -0.0348274857, -0.0370752551, 0.0340782292, -0.0097661642, 0.1280452609, -0.0389871486, 0.0184342805, 0.1063426808, -0.0434568487, 0.0202945024, 0.0166128147, 0.0341299027, 0.0003223496, -0.0275416169, -0.0338198654, -0.1077895164, -0.0054288763, -0.0195969194, -0.0759590566, -0.0519828647, 0.025410112, -0.0920809805, -0.0306936596, -0.0639192834, -0.1258750111, -0.0115682539, -0.0229168981, -0.044464469, -0.0076669557, -0.0337165184, -0.1244281679, 0.0923910141, -0.0065818261, -0.0816430673, -0.0320113152, -0.0432759933, -0.0482107475, 0.1430303901, 0.0649010688, 0.0778192803, 0.0431209728, -0.0946646184, 0.0301769301, 0.0697066411, 0.0995218679, 0.0122335413, -0.0183696896, -0.021780096, 0.0619040467, -0.0872754082, -0.0038690029, 0.0079834517, 0.1178140491, -0.0558583252, -0.10437911, 0.0028759157, 0.051724501, 0.0430951379, -0.0075313146, 0.0723419562, -0.058080256, 0.0538430847, -0.1254616231, 0.0492700413, 0.0391680039, 0.0964731649, -0.1646296233, 0.1308355927, 0.0578735657, 0.0324246995, -0.0810229927, 0.0317271166, 0.0145975733, -0.0324505344, 0.0159798209, -0.0691899136, -0.0214313045, -0.0273865983, -0.0612839721, 0.0009244592, -0.056116689, 0.0485207848, -0.0427851006, 0.0210566763, -0.0714118481, -0.0275157802, 0.0721869394, 0.0241699647, 0.0176591892, -0.0122206239, 0.0302286036, 0.0280325077, -0.0529646464, -0.0281616915, 0.0248546302, -0.0672780201, -0.1469575167, 0.1859188378, 0.0490375124, -0.0156051936, -0.0830382332, 0.0997285545 ]
802.0271
Chunlei Liu
Chunlei Liu
Generic exponential sums associated to Laurent polynomials in one variable
null
null
null
null
math.NT math.AG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Generic Newton polygons for L-functions of exponential sums associated to Laurent polynomials in one variable are determined. The corresponding Hasse polynomials are also determined.
[ { "version": "v1", "created": "Sun, 3 Feb 2008 15:30:12 GMT" }, { "version": "v2", "created": "Sat, 23 Aug 2008 01:58:02 GMT" }, { "version": "v3", "created": "Fri, 19 Sep 2008 05:43:38 GMT" } ]
2008-09-19T00:00:00
[ [ "Liu", "Chunlei", "" ] ]
[ -0.0183826461, -0.0959012434, 0.009875657, -0.0487057529, -0.0196569245, -0.0781557411, -0.0400453769, -0.0477854386, -0.0315737873, -0.0225122515, 0.0039998181, -0.0723506957, -0.0835360289, -0.0729170367, -0.0262170974, -0.0195389353, 0.0284352861, -0.102414228, 0.0140052633, 0.0601742566, -0.0165184233, -0.0589943677, 0.1136467531, -0.0455672517, 0.1159121394, -0.0623452477, -0.0652241781, -0.0378743857, 0.0661680847, 0.0175331272, 0.0675839484, -0.0782029331, 0.0209430009, -0.0079465415, -0.0779669583, 0.0711708069, -0.011556997, 0.1394154876, -0.0105186962, 0.0719259381, -0.006524777, -0.0227364302, -0.1166672632, -0.0104597015, 0.088585943, -0.0321873277, -0.0037254945, -0.0192203652, 0.0008568932, 0.0134625146, 0.0054156831, 0.0780613497, 0.0750408396, 0.0172263552, -0.0762679204, -0.0594663247, -0.0118578682, 0.1176111773, -0.0052475492, -0.0443637669, 0.0760791376, -0.1895371079, 0.0604574308, -0.0228662174, -0.0437030271, -0.0053212922, -0.1247848868, -0.0214031562, 0.0553131215, 0.033980757, -0.0655545443, 0.0077813575, 0.1156289652, 0.0821673572, 0.0928807333, 0.0612125583, -0.0417680144, 0.0533781052, -0.1104374602, 0.0488001406, 0.01539753, 0.0847159177, 0.0386295132, 0.0578616783, 0.0121056447, -0.0601742566, 0.003731394, 0.0108372653, -0.0761263371, -0.0038375838, 0.0472190939, -0.0277037565, -0.0374024287, 0.0481866002, 0.0772590265, 0.0046399073, 0.0769286603, 0.0477146469, 0.0609293841, 0.0196215268, 0.0093624061, 0.0496024638, 0.1037357002, -0.1371501088, 0.1360174119, 0.04117807, -0.1017534882, -0.0095275911, -0.0259103272, -0.0509711355, -0.0390778705, 0.0202940628, -0.095712468, -0.0582392402, 0.0524341948, 0.0387003049, -0.1102486774, -0.0197749119, -0.0470775068, 0.0407533087, 0.014064258, -0.0951461196, 0.0142884366, -0.0683390796, 0.0613069497, -0.0053448901, 0.0153739322, -0.0637611151, 0.0129787615, -0.0335559957, 0.0420275889, -0.0184770357, -0.0119522596, -0.0080173351, -0.0695661604, 0.0441277884, 0.0838663951, 0.0083477031, 0.0618260987, 0.0042475946, 0.1013759226, 0.0452368818, 0.0237157363, 0.0575785041, -0.0182292592, 0.0657905191, -0.0244708639, -0.008194318, -0.0187366121, 0.0178162996, 0.0231847875, -0.0597966909, 0.0467471369, -0.0051354598, -0.0208722074, -0.0942965969, 0.0393610448, 0.0035986565, 0.0428299122, 0.0110968407, 0.0208250117, 0.0948157534, 0.0436086394, 0.0365057141, 0.1215755939, 0.0441277884, 0.0076810666, -0.0621092729, -0.0646578297, -0.1241241544, 0.0304882899, -0.0326356851, -0.0127899796, -0.0380631685, -0.0194917396, 0.0035809581, -0.0572481342, -0.1269558817, -0.1738682091, -0.0708404407, -0.0081294244, 0.0780141503, -0.0850934759, -0.0131203476, 0.0642330721, -0.0171437636, 0.1357342452, 0.0004081673, 0.1146850511, -0.0430894867, -0.0126247946, 0.0438918099, 0.1563114822, 0.0978834555, 0.0310310386, -0.1549900025, 0.0790996477, 0.0262170974, -0.0116513874, -0.0350426547, 0.00096972, 0.0571537465, 0.0753240138, 0.0302051175, -0.0226538386, 0.0212379731, 0.0249664169, 0.0738609508, -0.0679143146, -0.0571065508, 0.0119404607, -0.0781557411, 0.0292376094, -0.0886331424, -0.0983554125, 0.0807042941, -0.0626756176, -0.0082828095, -0.0109375557, 0.1466836035, -0.066451259, 0.0168959871, 0.0275857672, 0.0887275338, -0.0464403667, 0.0770230517, 0.0711708069, -0.0594663247, -0.0538500585, -0.0449773073, -0.0735305846, 0.0030131375, -0.0777781755, -0.0755127892, -0.0025279087, -0.0409184955, 0.0564930066, -0.0165066253, -0.0779197663, -0.051207114, -0.0432074741, 0.0763623118, 0.0103181154, -0.0561626405, 0.025438372, 0.0048257392, -0.0055513703, -0.0084243957, 0.0078934468, -0.0375912115, -0.0486113615, 0.1176111773, 0.0909929127, -0.1068506017, -0.0287656542, -0.0265238676 ]
802.0272
Synge Todo
Kouki Fukui and Synge Todo
Order-N Cluster Monte Carlo Method for Spin Systems with Long-range Interactions
25 pages, 4 figures
null
10.1016/j.jcp.2008.12.022
null
cond-mat.stat-mech
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
An efficient O(N) cluster Monte Carlo method for Ising models with long-range interactions is presented. Our novel algorithm does not introduce any cutoff for interaction range and thus it strictly fulfills the detailed balance. The realized stochastic dynamics is equivalent to that of the conventional Swendsen-Wang algorithm, which requires O(N^2) operations per Monte Carlo sweep if applied to long-range interacting models. In addition, it is shown that the total energy and the specific heat can also be measured in O(N) time. We demonstrate the efficiency of our algorithm over the conventional method and the O(N log N) algorithm by Luijten and Bloete. We also apply our algorithm to the classical and quantum Ising chains with inverse-square ferromagnetic interactions, and confirm in a high accuracy that a Kosterlitz-Thouless phase transition, associated with a universal jump in the magnetization, occurs in both cases.
[ { "version": "v1", "created": "Sun, 3 Feb 2008 15:31:53 GMT" } ]
2009-11-13T00:00:00
[ [ "Fukui", "Kouki", "" ], [ "Todo", "Synge", "" ] ]
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802.0273
Zheng-Yu Weng
K. Wu, Z.Y. Weng, and J. Zaanen
On the sign structure of doped Mott insulators
4 pages, 1 figure
Phys. Rev. B77, 155102 (2008)
10.1103/PhysRevB.77.155102
null
cond-mat.str-el cond-mat.stat-mech
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We demonstrate that the sign structure of the t-J model on a hypercubic lattice is entirely different from that of a Fermi gas, by inspecting the high temperature expansion of the partition function up to all orders, as well as the multi-hole propagator of the half-filled state and the perturbative expansion of the ground state energy. We show that while the fermion signs can be completely gauged away by a Marshall sign transformation at half-filling, the bulk of the signs can be also gauged away in a doped case, leaving behind a rarified "irreducible" sign structure that can be enumerated easily by counting exchanges of holes with themselves and spins on their real space paths. Such a sparse sign structure implies a mutual statistics for the quantum states of the doped Mott insulator.
[ { "version": "v1", "created": "Sun, 3 Feb 2008 16:04:47 GMT" } ]
2009-09-30T00:00:00
[ [ "Wu", "K.", "" ], [ "Weng", "Z. Y.", "" ], [ "Zaanen", "J.", "" ] ]
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802.0274
Jesse Pino
Jesse Pino, S. M. Mahajan
Global axisymmetric Magnetorotational Instability with density gradients
22 pages, 5 figures
ApJ 678:1223, 2008 May 10
10.1086/586705
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We examine global incompressible axisymmetric perturbations of a differentially rotating MHD plasma with radial density gradients. It is shown that the standard magnetorotational instability, (MRI) criterion drawn from the local dispersion relation is often misleading. If the equilibrium magnetic field is either purely axial or purely toroidal, the problem reduces to finding the global radial eigenvalues of an effective potential. The standard Keplerian profile including the origin is mathematically ill-posed, and thus any solution will depend strongly on the inner boundary. We find a class of unstable modes localized by the form of the rotation and density profiles, with reduced dependence on boundary conditions.
[ { "version": "v1", "created": "Sun, 3 Feb 2008 17:00:27 GMT" } ]
2009-11-13T00:00:00
[ [ "Pino", "Jesse", "" ], [ "Mahajan", "S. M.", "" ] ]
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802.0275
Alexander Giddings
A. D. Giddings, T. Jungwirth, B. L. Gallagher
(Ga,Mn)As based superlattices and the search for antiferromagnetic interlayer coupling
11 pages, 9 figures
Phys. Rev. B 78, 165312 (2008)
10.1103/PhysRevB.78.165312
null
cond-mat.mtrl-sci
http://creativecommons.org/licenses/by-nc-sa/3.0/
Antiferromagnetic interlayer coupling in dilute magnetic semiconductor superlattices could result in the realisation of large magnetoresistance effects analogous to the giant magnetoresistance seen in metallic multilayer structures. In this paper we use a mean-field theory of carrier induced ferromagnetism to explore the multidimensional parameter space available in (Ga,Mn)As based superlattice systems. Based on these investigations we examine the feasibility of creating a superlattice that exhibits antiferromagnetic coupling and suggest potentially viable recipes.
[ { "version": "v1", "created": "Sun, 3 Feb 2008 17:06:21 GMT" }, { "version": "v2", "created": "Wed, 3 Sep 2008 09:37:56 GMT" } ]
2010-10-29T00:00:00
[ [ "Giddings", "A. D.", "" ], [ "Jungwirth", "T.", "" ], [ "Gallagher", "B. L.", "" ] ]
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802.0276
Leonid Glozman
L. Ya. Glozman and R. F. Wagenbrunn
Chirally symmetric but confined hadrons at finite density
4 pp.; Contribution to proceedings of "Chiral 07", November 13-16, 2007, Osaka, Japan
Mod.Phys.Lett.A23:2385-2388,2008
10.1142/S0217732308029435
null
hep-ph astro-ph hep-lat hep-th nucl-th
null
At a critical finite chemical potential and low temperature QCD undergoes the chiral restoration phase transition. The folklore tradition is that simultaneously hadrons are deconfined and there appears the quark matter. We demonstrate that it is possible to have confined but chirally symmetric hadrons at a finite chemical potential and hence beyond the chiral restoration point at a finite chemical potential and low temperature there could exist a chirally symmetric matter consisting of chirally symmetric but confined hadrons. If it does happen in QCD, then the QCD phase diagram should be reconsidered with obvious implications for heavy ion programs and astrophysics.
[ { "version": "v1", "created": "Sun, 3 Feb 2008 17:46:07 GMT" } ]
2008-11-26T00:00:00
[ [ "Glozman", "L. Ya.", "" ], [ "Wagenbrunn", "R. F.", "" ] ]
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802.0277
Fernando Sancho de Salas
Carlos Sancho de Salas, Fernando Sancho de Salas
The linear dual of the derived category of a scheme
This paper has been withdrawn
null
null
null
math.AG
null
This paper has been withdrawn because Proposition 2.2 (c) is false. This invalids the main results of section 2 and 3. We thank A. Canonaco for pointing us the error.
[ { "version": "v1", "created": "Sun, 3 Feb 2008 17:41:59 GMT" }, { "version": "v2", "created": "Thu, 14 Feb 2008 08:28:35 GMT" } ]
2009-09-29T00:00:00
[ [ "de Salas", "Carlos Sancho", "" ], [ "de Salas", "Fernando Sancho", "" ] ]
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802.0278
Eduardo C. Marino
C.M.S. da Concei\c{c}\~ao, E.C.Marino
Stable Mean Field Solution of a Short-Range Interacting SO(3) Quantum Heisenberg Spin-Glass
4 pages
null
10.1103/PhysRevLett.101.037201
null
cond-mat.dis-nn hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a mean-field solution for a quantum, short-range interacting, disordered, SO(3) Heisenberg spin model, in which the Gaussian distribution of couplings is centered in an AF coupling $\bar J>0$, and which, for weak disorder, can be treated as a perturbation of the pure AF Heisenberg system. The phase diagram contains, apart from a N\'eel phase at T=0, spin-glass and paramagnetic phases whose thermodynamic stability is demonstrated by an analysis of the Hessian matrix of the free-energy. The magnetic susceptibilities exhibit the typical cusp of a spin-glass transition.
[ { "version": "v1", "created": "Sun, 3 Feb 2008 18:11:50 GMT" } ]
2009-11-13T00:00:00
[ [ "da Conceição", "C. M. S.", "" ], [ "Marino", "E. C.", "" ] ]
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802.0279
Parsa Bonderson
Parsa Bonderson, Michael Freedman, Chetan Nayak
Measurement-Only Topological Quantum Computation
5 pages, 2 figures; v2: clarifying changes made to conform to the version published in PRL
Phys. Rev. Lett. 101, 010501 (2008)
10.1103/PhysRevLett.101.010501
null
quant-ph cond-mat.mes-hall hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We remove the need to physically transport computational anyons around each other from the implementation of computational gates in topological quantum computing. By using an anyonic analog of quantum state teleportation, we show how the braiding transformations used to generate computational gates may be produced through a series of topological charge measurements.
[ { "version": "v1", "created": "Sun, 3 Feb 2008 18:14:48 GMT" }, { "version": "v2", "created": "Fri, 15 Aug 2008 22:44:32 GMT" } ]
2009-09-21T00:00:00
[ [ "Bonderson", "Parsa", "" ], [ "Freedman", "Michael", "" ], [ "Nayak", "Chetan", "" ] ]
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802.028
Ian Affleck
Ian Affleck, Laszlo Borda and Hubert Saleur
Friedel oscillations and the Kondo screening cloud
More extensive discussion of experimental situation and referencing of earlier work added
Phys. Rev. B 77, 180404(R) (2008)
10.1103/PhysRevB.77.180404
null
cond-mat.str-el
null
We show that the long distance charge density oscillations in a metal induced by a weakly coupled spin-1/2 magnetic impurity exhibiting the Kondo effect are given, at zero temperature, by a universal function F(r/xi_K) where r is the distance from the impurity and xi_K, the Kondo screening cloud size =v_F/T_K, where v_F is the Fermi velocity and T_K is the Kondo temperature. F is given by a Fourier-like transform of the T-matrix. Analytic expressions for F(r/xi_K) are derived in both limits r much less than xi_K and r much greater than xi_K and F is calculated for all r/xi_K using numerical methods.
[ { "version": "v1", "created": "Sun, 3 Feb 2008 18:17:57 GMT" }, { "version": "v2", "created": "Thu, 7 Feb 2008 18:36:25 GMT" }, { "version": "v3", "created": "Thu, 7 Feb 2008 23:40:07 GMT" }, { "version": "v4", "created": "Wed, 30 Apr 2008 21:57:10 GMT" } ]
2008-06-04T00:00:00
[ [ "Affleck", "Ian", "" ], [ "Borda", "Laszlo", "" ], [ "Saleur", "Hubert", "" ] ]
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802.0281
Junhao Shen
Don Hadwin, Qihui Li, Junhao Shen
Topological Free Entropy Dimensions in Nuclear C$^*$-algebras and in Full Free Products of C$^*$-algebras
null
null
null
null
math.OA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In the paper, we introduce a new concept of topological orbit dimension of $n$-tuples of elements in a unital C$^*$ algebra. Using this concept, we conclude that the Voiculescu's topological free entropy dimension of any family of self-adjoint generators of a nuclear C$^*$ algebra is less than or equal to 1. We also show that the topological free entropy dimension is additive in the full free products of unital C$^*$ algebras. In the appendix, we show that unital full free product of Blackadar and Kirchberg's unital MF algebras is also MF algebra.
[ { "version": "v1", "created": "Sun, 3 Feb 2008 18:21:42 GMT" }, { "version": "v2", "created": "Fri, 30 May 2008 17:00:23 GMT" }, { "version": "v3", "created": "Wed, 23 Jul 2008 17:22:08 GMT" }, { "version": "v4", "created": "Tue, 18 Nov 2008 03:50:20 GMT" } ]
2008-11-18T00:00:00
[ [ "Hadwin", "Don", "" ], [ "Li", "Qihui", "" ], [ "Shen", "Junhao", "" ] ]
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802.0282
Jean-Marc Couveignes
Jean-Marc Couveignes and Reynald Lercier
Galois invariant smoothness basis
null
null
null
null
math.NT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This text answers a question raised by Joux and the second author about the computation of discrete logarithms in the multiplicative group of finite fields. Given a finite residue field $\bK$, one looks for a smoothness basis for $\bK^*$ that is left invariant by automorphisms of $\bK$. For a broad class of finite fields, we manage to construct models that allow such a smoothness basis. This work aims at accelerating discrete logarithm computations in such fields. We treat the cases of codimension one (the linear sieve) and codimension two (the function field sieve).
[ { "version": "v1", "created": "Sun, 3 Feb 2008 18:22:19 GMT" } ]
2008-02-05T00:00:00
[ [ "Couveignes", "Jean-Marc", "" ], [ "Lercier", "Reynald", "" ] ]
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802.0283
Matthew Foster
Matthew S. Foster and Igor L. Aleiner
Graphene via large N I: Renormalization
25 pages, 21 figures
Phys. Rev. B 77, 195413 (2008)
10.1103/PhysRevB.77.195413
null
cond-mat.dis-nn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We analyze the competing effects of moderate to strong Coulomb electron-electron interactions and weak quenched disorder in graphene. Using a one-loop renormalization group calculation controlled within the large-N approximation, we demonstrate that, at successively lower energy (temperature or chemical potential) scales, a type of non-Abelian vector potential disorder always asserts itself as the dominant elastic scattering mechanism for generic short-ranged microscopic defect distributions. Vector potential disorder is tied to both elastic lattice deformations ("ripples") and topological lattice defects. We identify several well-defined scaling regimes, for which we provide scaling predictions for the electrical conductivity and thermopower, valid when the inelastic lifetime due to interactions exceeds the elastic lifetime due to disorder. Coulomb interaction effects should figure strongly into the physics of suspended graphene films, where rs > 1; we expect vector potential disorder to play an important role in the description of transport in such films.
[ { "version": "v1", "created": "Sun, 3 Feb 2008 18:32:58 GMT" } ]
2009-11-13T00:00:00
[ [ "Foster", "Matthew S.", "" ], [ "Aleiner", "Igor L.", "" ] ]
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802.0284
Mario J. Pinheiro
Alexandre A. Martins and Mario J. Pinheiro
On the electromagnetic origin of inertia and inertial mass
8 pages, no figures, submitted to refereed journal
International Journal of Theoretical Physics, Volume 47, Number 10 / October, 2008
10.1007/s10773-008-9709-y
null
physics.class-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We address the problem of inertial property of matter through analysis of the motion of an extended charged particle. Our approach is based on the continuity equation for momentum (Newton's second law) taking due account of the vector potential and its convective derivative. We obtain a development in terms of retarded potentials allowing an intuitive physical interpretation of its main terms. The inertial property of matter is then discussed in terms of a kind of induction law related to the extended charged particle's own vector potential. Moreover, it is obtained a force term that represents a drag force acting on the charged particle when in motion relatively to its own vector potential field lines. The time rate of variation of the particle's vector potential leads to the acceleration inertia reaction force, equivalent to the Schott term responsible for the source of the radiation field. We also show that the velocity dependent term of the particle's vector potential is connected with the relativistic increase of mass with velocity and generates a longitudinal stress force that is the source of electric field lines deformation. In the framework of classical electrodynamics, we have shown that the electron mass has possibly a complete electromagnetic origin and the obtained covariant equation solves the "4/3 mass paradox" for a spherical charge distribution.
[ { "version": "v1", "created": "Sun, 3 Feb 2008 18:52:12 GMT" } ]
2009-01-23T00:00:00
[ [ "Martins", "Alexandre A.", "" ], [ "Pinheiro", "Mario J.", "" ] ]
[ 0.0958115384, 0.0380848572, -0.0868205652, -0.0021612926, 0.0116421627, 0.0542686172, -0.0299468692, 0.0676398128, -0.0155151989, -0.030938182, -0.0470988862, 0.106416285, 0.0012614744, 0.0113136461, 0.0298777092, 0.0609542131, 0.0395141914, -0.0560207032, -0.0277337059, 0.0510871932, -0.0019754213, -0.0436408184, 0.0947971717, 0.0257049724, -0.0846535042, -0.1463454366, -0.0523782037, -0.0258202422, 0.0503494702, -0.0266271252, 0.0891259462, -0.0589715876, -0.0912929997, -0.0378082134, -0.0373240821, 0.1116725504, -0.112225838, -0.0241142623, -0.0687924996, -0.0139936488, -0.0541764013, 0.0048240051, -0.1091827378, 0.0775068328, -0.0661182627, -0.0035675736, 0.0600781702, 0.008114933, 0.0907397047, 0.0285636429, -0.0579111129, -0.0493351072, 0.118588686, -0.0173710287, -0.0942438841, -0.0376929417, 0.0599398464, 0.0615536124, -0.0714667439, -0.0186044071, 0.0378312655, -0.0787056312, -0.0621530116, -0.0386150926, -0.1449622214, 0.0423267521, -0.0005388823, -0.0102992794, 0.0180280618, 0.0751553476, 0.0473985858, 0.0489662439, 0.0185813531, 0.0239067785, 0.0000196543, -0.0606775694, -0.065103896, -0.0516404845, -0.069991298, 0.0957193226, 0.0200452674, -0.0351570249, -0.0341657139, 0.0003555326, -0.1337119639, -0.0074175564, 0.0637667775, -0.0049450374, -0.0870972127, 0.017843632, -0.0293244179, 0.0619685799, -0.0812876523, 0.0846996158, 0.1323287338, -0.061046429, 0.1154533699, -0.0362636074, 0.0323214084, 0.0903247371, -0.0208752044, -0.0095154513, 0.0400674827, 0.097471416, 0.0666715503, -0.0184084494, 0.0618763641, 0.0135902073, -0.0677320287, 0.0447704569, 0.1147156432, 0.0296702255, -0.0884343311, -0.0005115059, -0.1183120385, 0.0219126251, -0.1091827378, 0.0750170276, -0.1455155015, 0.0329669155, -0.0063858991, 0.0635823458, 0.0704984814, -0.0035416381, 0.1048486233, -0.1326975971, -0.1324209571, -0.0161491781, -0.0475830175, -0.0136824232, 0.0832241699, 0.0248289295, -0.0563434586, -0.1291012168, -0.0344193056, 0.0351109169, 0.0807343647, 0.0051064137, 0.080688253, 0.0310995597, -0.0094232354, -0.0145469401, -0.0183047075, 0.0217743032, 0.0293244179, 0.0542225093, 0.065242216, -0.0231460035, 0.1800039709, -0.0672709495, -0.0247828215, 0.0156304687, 0.0272265226, 0.0450240485, 0.0149158007, -0.0660260469, 0.1140701398, 0.0703140497, 0.0055818981, -0.0392144918, -0.0315836892, 0.0118842274, -0.0672248453, -0.0234341752, 0.0962726176, 0.0758930668, -0.0824864507, -0.0906936005, -0.0668559819, -0.0961804017, 0.0078498144, -0.1248593107, -0.1165599525, 0.0485512763, 0.0704984814, 0.0515943766, 0.0265810173, -0.067547597, 0.1006989405, 0.0582799762, -0.0373471342, -0.0006836889, 0.0175439324, 0.0121378191, -0.0031497236, 0.0780601278, -0.0255897045, 0.0593865551, 0.057680577, -0.0017131846, 0.0122761419, 0.0745559484, 0.0169906411, 0.0654266477, -0.0940594524, -0.0699451938, 0.0713284165, -0.0600781702, -0.0105067641, 0.0444015935, 0.0770918652, 0.0781523362, 0.0894025862, -0.0278720297, -0.0257280264, 0.0466608666, 0.0907858163, 0.021163376, -0.0940133482, 0.0230998956, 0.0151117574, -0.0470297262, 0.0478135571, 0.0022679165, -0.0501189344, 0.0228808839, -0.0567584261, 0.0376237817, -0.0422114842, 0.0922612548, -0.0838235691, 0.0754319951, 0.0730343983, 0.0856217667, 0.0775068328, -0.008967923, 0.0271112546, -0.0326441638, -0.0421192683, 0.010552871, 0.0321830884, -0.0076135132, -0.0059305867, -0.0606314614, 0.0401827507, -0.0240912084, -0.004051703, 0.0134173045, -0.0143279294, -0.013786165, -0.0108352797, 0.0082013849, -0.0151924463, 0.0512255169, -0.0970103368, 0.0359639078, 0.0223275926, 0.0561590269, 0.0672709495, -0.0604931377, 0.0597554184, 0.0292091481, 0.0697146505, 0.0961804017, -0.0851145834, -0.0054378123 ]
802.0285
Jiandong Wang
Jiandong Wang, Jianke Yang
Families of Vortex Solitons in Periodic Media
To appear in Phys. Rev. A (with higher resolution figures)
null
10.1103/PhysRevA.77.033834
null
nlin.PS
http://creativecommons.org/licenses/by-nc-sa/3.0/
Various families of charge-one vortex solitons in two-dimensional periodic media are reported. These vortices reside either in the semi-infinite gap or higher band gaps of the media. For both Kerr and saturable nonlinearities (either focusing or defocusing), infinite vortex families are found. All these families do not bifurcate from Bloch bands; rather, they turn around before reaching edges of Bloch bands. It is further revealed that vortices with drastically different topological shapes can belong to the same vortex family, which is quite surprising.
[ { "version": "v1", "created": "Sun, 3 Feb 2008 18:55:43 GMT" } ]
2009-11-13T00:00:00
[ [ "Wang", "Jiandong", "" ], [ "Yang", "Jianke", "" ] ]
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802.0286
William Zech Mr.
William F. Zech, Nicolas Lehner, J. Christopher Howk, W. Van Dyke Dixon, Thomas M. Brown
The High Velocity Gas toward Messier 5: Tracing Feedback Flows in the Inner Galaxy
23 pages, 11 figures, 7 tables
null
10.1086/587135
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present Far Ultraviolet Spectroscopic Explorer (FUSE) and Space Telescope Imaging Spectrograph (STIS E140M) observations of the post-asymptotic giant branch star ZNG 1 in the globular cluster Messier 5 (l=3.9, b=+47.7; d=7.5 kpc, z=+5.3 kpc). High velocity absorption is seen in C IV, Si IV, O VI, and lower ionization species at LSR velocities of -140 and -110 km/s. We conclude that this gas is not circumstellar on the basis of photoionization models and path length arguments. Thus, the high velocity gas along the ZNG 1 sight line is the first evidence that highly-ionized HVCs can be found near the Galactic disk. We measure the metallicity of these HVCs to be [O/H]=+0.22\pm0.10, the highest of any known HVC. Given the clouds' metallicity and distance constraints, we conclude that these HVCs have a Galactic origin. This sight line probes gas toward the inner Galaxy, and we discuss the possibility that these HVCs may be related to a Galactic nuclear wind or Galactic fountain circulation in the inner regions of the Milky Way.
[ { "version": "v1", "created": "Sun, 3 Feb 2008 18:59:17 GMT" } ]
2009-11-13T00:00:00
[ [ "Zech", "William F.", "" ], [ "Lehner", "Nicolas", "" ], [ "Howk", "J. Christopher", "" ], [ "Dixon", "W. Van Dyke", "" ], [ "Brown", "Thomas M.", "" ] ]
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802.0287
Fabrice Rossi
Catherine Krier (DICE), Fabrice Rossi (INRIA Rocquencourt / INRIA Sophia Antipolis), Damien Fran\c{c}ois (CESAME), Michel Verleysen (DICE - MLG)
A data-driven functional projection approach for the selection of feature ranges in spectra with ICA or cluster analysis
A paraitre
Chemometrics and Intelligent Laboratory Systems (2008)
10.1016/j.chemolab.2007.09.004
null
cs.NE
null
Prediction problems from spectra are largely encountered in chemometry. In addition to accurate predictions, it is often needed to extract information about which wavelengths in the spectra contribute in an effective way to the quality of the prediction. This implies to select wavelengths (or wavelength intervals), a problem associated to variable selection. In this paper, it is shown how this problem may be tackled in the specific case of smooth (for example infrared) spectra. The functional character of the spectra (their smoothness) is taken into account through a functional variable projection procedure. Contrarily to standard approaches, the projection is performed on a basis that is driven by the spectra themselves, in order to best fit their characteristics. The methodology is illustrated by two examples of functional projection, using Independent Component Analysis and functional variable clustering, respectively. The performances on two standard infrared spectra benchmarks are illustrated.
[ { "version": "v1", "created": "Sun, 3 Feb 2008 19:02:49 GMT" } ]
2008-02-05T00:00:00
[ [ "Krier", "Catherine", "", "DICE" ], [ "Rossi", "Fabrice", "", "INRIA Rocquencourt / INRIA\n Sophia Antipolis" ], [ "François", "Damien", "", "CESAME" ], [ "Verleysen", "Michel", "", "DICE -\n MLG" ] ]
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802.0288
Yuriy Kuzovlev E.
Yuriy E. Kuzovlev
Virial expansion of molecular Brownian motion versus tales of "statistical independency"
21 pages, 1 figure, IOPART, to be submitted to JSTAT
null
null
DonPTI-08-YUK-01
cond-mat.stat-mech cond-mat.soft
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Basing on main principles of statistical mechanics only, an exact virial expansion for path probability distribution of molecular Brownian particle in a fluid is derived which connects response of the distribution to perturbations of the fluid and statistical correlations of its molecules with Brownian particle. The expansion implies that (i) spatial spread of these correlations is finite, (ii) this is inconsistent with Gaussian distribution involved by the ``molecular chaos'' hypothesis, and (iii) real path distribution possesses power-law long tails. This means that actual Brownian path never can be disjointed into statistically independent fragments, even in the Boltzmann-Grad gas, but behaves as if Brownian particle's diffusivity undergoes scaleless low-frequency fluctuations.
[ { "version": "v1", "created": "Sun, 3 Feb 2008 19:07:50 GMT" } ]
2008-02-05T00:00:00
[ [ "Kuzovlev", "Yuriy E.", "" ] ]
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802.0289
Wei Liu
Wei Liu
Harnack Inequality and Applications for Stochastic Evolution Equations with Monotone Drifts
25 pages, to appear in J. Evol. Equ
J. Evol. Equat. 9(2009), 747-770
10.1007/s00028-009-0032-8
null
math.PR math.AP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, the dimension-free Harnack inequality is proved for the associated transition semigroups to a large class of stochastic evolution equations with monotone drifts. As applications, the ergodicity, hyper-(or ultra-)contractivity and compactness are established for the corresponding transition semigroups. Moreover, the exponential convergence of the transition semigroups to invariant measure and the existence of a spectral gap are also derived. The main results are applied to many concrete stochastic evolution equations such as stochastic reaction-diffusion equations, stochastic porous media equations and the stochastic p-Laplace equation in Hilbert space.
[ { "version": "v1", "created": "Sun, 3 Feb 2008 19:17:03 GMT" }, { "version": "v2", "created": "Fri, 6 Jun 2008 11:43:49 GMT" }, { "version": "v3", "created": "Fri, 19 Sep 2008 16:47:18 GMT" }, { "version": "v4", "created": "Thu, 10 Sep 2009 10:31:43 GMT" } ]
2010-05-06T00:00:00
[ [ "Liu", "Wei", "" ] ]
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802.029
Prosenjit Singha Deo
P. Singha Deo
Non-Ergodic Mesoscopic Systems
1 figure
null
null
null
cond-mat.mes-hall
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Suppose there is a mesoscopic system connected to single channel leads. If the system is non-chaotic or non-ergodic then the thermodynamic and transport properties do not depend on impurity averaged density of states. We show that the partial density of states as well as density of states of a given system can be determined exactly from the asymptotic wave-function (or scattering matrix) at the resonances. The asymptotic wave-function can be determined experimentally without any knowledge about the quantum mechanical potential (including electron-electron interaction) or wave function in the interior of the system. Some counter intuitive relations derived here can allow this.
[ { "version": "v1", "created": "Sun, 3 Feb 2008 19:26:56 GMT" }, { "version": "v2", "created": "Sun, 8 Jun 2008 14:57:07 GMT" } ]
2008-06-08T00:00:00
[ [ "Deo", "P. Singha", "" ] ]
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802.0291
Gabriel Pietrzkowski
Bronis{\l}aw Jakubczyk, Gabriel Pietrzkowski
Integral representations of separable states
21 pages, no figures, added references, to appear in Reports on Mathematical Physics
Rep. Math. Phys. 63, 111-130 (2009)
10.1016/S0034-4877(09)90008-8
null
math-ph math.MP quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study a separability problem suggested by mathematical description of bipartite quantum systems. We consider Hermitian 2-forms on the tensor product $H=K\otimes L$, where $K,L$ are finite dimensional complex spaces. Inspired by quantum mechanical terminology we call such a form separable if it is a convex combination of hermitian tensor products $(\sigma_p)^*\odot \sigma_p$ of 1-forms $\sigma_p$ on $H$ that are product forms $\sigma_p=\phi_p\otimes \psi_p$, where $\phi_p\in K^*$, $\psi_p\in L^*$. We introduce an integral representation of separable forms. In particular, we show that the integral of $(D_{z^*}}\Phi)^*\odot D_{z^*}\Phi$ of any square integrable map $\Phi:\C^n\to \C^m$, with square integrable conjugate derivative $D_{z^*}\Phi$, is a separable form. Vice versa, any separable form in the interior of the set of such forms, can be represented in this way. This implies that any separable mixed state (and only such states) can be either explicitly represented in the integral form, or it may be arbitrarily well approximated by such states.
[ { "version": "v1", "created": "Sun, 3 Feb 2008 19:44:45 GMT" }, { "version": "v2", "created": "Sun, 7 Dec 2008 14:12:03 GMT" } ]
2010-01-11T00:00:00
[ [ "Jakubczyk", "Bronisław", "" ], [ "Pietrzkowski", "Gabriel", "" ] ]
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802.0292
Weihua Li
Don Hadwin, Weihua Li, Junhao Shen
An Elementary Proof of the Free-additivity of Voiculescu's Free Entropy
null
null
null
null
math.OA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
D. Voiculescu [2] proved that a standard family of independent random unitary k by k matrices and a constant k by k unitary matrix is asymtotically free as k goes to infinity. This result was a key ingredient in Voiculescu's proof [3] that his free entropy is additive when the variables are free. In this paper, we give a very elementary proof of a more detailed version of this result [2].
[ { "version": "v1", "created": "Sun, 3 Feb 2008 19:56:12 GMT" } ]
2008-02-05T00:00:00
[ [ "Hadwin", "Don", "" ], [ "Li", "Weihua", "" ], [ "Shen", "Junhao", "" ] ]
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802.0293
Inanc Sahin
I. Sahin
Anomalous Higgs couplings in egamma collision with initial beam and final state polarizations
15 pages, 10 figures, 2 tables
Phys.Rev.D77:115010,2008
10.1103/PhysRevD.77.115010
null
hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We investigate the constraints on the anomalous WWH couplings through the process $e^{-}\gamma \to \nu_{e} W^{-} H$. Considering incoming beam polarizations and the longitudinal and transverse polarization states of the final W boson, we find 95% confidence level limits on the anomalous coupling parameters with an integrated luminosity of 500 $fb^{-1}$ and $\sqrt{s}$= 0.5 and 1 TeV energy. We show that initial beam and final state polarizations highly improve the sensitivity limits of the anomalous coupling parameters $b_{W}$ and $\beta_{W}$.
[ { "version": "v1", "created": "Sun, 3 Feb 2008 19:56:26 GMT" }, { "version": "v2", "created": "Sun, 8 Jun 2008 01:15:54 GMT" } ]
2008-11-26T00:00:00
[ [ "Sahin", "I.", "" ] ]
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802.0294
Claude Viallet
Claude Viallet (LPTHE)
Integrable Lattice Maps: $Q_5$, a Rational Version of $Q_4$
null
Glasgow Math. J. 51A:157, 2009
null
null
hep-th nlin.SI
null
We give a rational form of a generic two-dimensional "quad" map, containing the so-called $Q_4$ case, but whose coefficients are free. Its integrability is proved using the calculation of algebraic entropy.
[ { "version": "v1", "created": "Sun, 3 Feb 2008 19:58:40 GMT" } ]
2014-11-18T00:00:00
[ [ "Viallet", "Claude", "", "LPTHE" ] ]
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802.0295
S Brendle
S. Brendle
On the conformal scalar curvature equation and related problems
to appear in Surveys in Differential Geometry
null
null
null
math.DG math.AP
null
We review recent compactness and non-compactness results for the Yamabe equation. We also discuss the asymptotic behavior of the parabolic Yamabe flow.
[ { "version": "v1", "created": "Sun, 3 Feb 2008 20:21:15 GMT" } ]
2008-02-05T00:00:00
[ [ "Brendle", "S.", "" ] ]
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802.0296
Alessandra De Rosa
P. Ubertini (INAF/IASF-Roma), A. De Rosa (INAF/IASF-Roma), A. Bazzano (INAF/IASF-Roma), L. Bassani (INAF/IASF-Bologna), V. Sguera (INAF/IASF-Bologna), (on behalf of the INTEGRAL survey team)
INTEGRAL high energy sky: The keV to MeV cosmic sources
Nucl. Instr. and Meth. A, in press. Proc. of Roma International Conference on Astroparticle Physics (RICAP'07)
Nucl.Instrum.Meth.A588:63-71,2008
10.1016/j.nima.2008.01.024
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
After almost 5 years of operation, ESA's International Gamma-Ray Astrophysics Laboratory (INTEGRAL) Space Observatory has unveiled a new soft Gamma ray sky and produced a remarkable harvest of results, ranging from identification of new high energy sources, to the discovery of dozens of variable sources to the mapping of the Aluminum emission from the Galaxy Plane to the presence of electrons and positrons generating the annihilation line in the Galaxy central radian. INTEGRAL is continuing the deep observations of the Galactic Plane and of the whole sky in the soft Gamma ray range. The new IBIS gamma ray catalogue contains more than 420 sources detected above 20 keV. We present a view of the INTEGRAL high energy sky with particular regard to sources emitting at high energy, including Active Galactic Nuclei (AGN), HESS/MAGIC counterparts and new view of the cosmic gamma ray diffuse background.
[ { "version": "v1", "created": "Sun, 3 Feb 2008 20:19:39 GMT" } ]
2009-06-23T00:00:00
[ [ "Ubertini", "P.", "", "INAF/IASF-Roma" ], [ "De Rosa", "A.", "", "INAF/IASF-Roma" ], [ "Bazzano", "A.", "", "INAF/IASF-Roma" ], [ "Bassani", "L.", "", "INAF/IASF-Bologna" ], [ "Sguera", "V.", "", "INAF/IASF-Bologna" ] ]
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802.0297
Dmitri Yafaev
D. R. Yafaev
Spectral and scattering theory of fourth order differential operators
null
null
null
null
math.SP math-ph math.MP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
An ordinary differential operator of the fourth order with coefficients converging at infinity sufficiently rapidly to constant limits is considered. Scattering theory for this operator is developed in terms of special solutions of the corresponding differential equation. In contrast to equations of second order "scattering" solutions contain exponentially decaying terms. A relation between the scattering matrix and a matrix of coefficients at exponentially decaying modes is found. In the second part of the paper the operator $D^4$ on the half-axis with different boundary conditions at the point zero is studied. Explicit formulas for basic objects of the scattering theory are found. In particular, a classification of different types of zero-energy resonances is given.
[ { "version": "v1", "created": "Sun, 3 Feb 2008 20:23:48 GMT" } ]
2008-02-05T00:00:00
[ [ "Yafaev", "D. R.", "" ] ]
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802.0298
Serguei Burmistrov Nikolaevich
S. N. Burmistrov, L. B. Dubovskii, V. L. Tsymbalenko
Hydrodynamic instability during non-uniform growth of a helium crystal
Revtex, 5 pages, 3 figures
null
10.1088/1742-6596/150/3/032013
null
cond-mat.other
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We analyze an analog of the hydrodynamic Rayleigh-Taylor instability for the liquid-solid phase interface under non-uniform growth of the solid phase. The development of the instability starts on conditions of an accelerated interface growth and if the magnitude of acceleration exceeds some critical value. The plane and spherical shapes of the interface are considered. The observation of the instability can be expected for helium crystals in the course of their abnormal fast growth.
[ { "version": "v1", "created": "Sun, 3 Feb 2008 20:27:15 GMT" } ]
2009-11-13T00:00:00
[ [ "Burmistrov", "S. N.", "" ], [ "Dubovskii", "L. B.", "" ], [ "Tsymbalenko", "V. L.", "" ] ]
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802.0299
Karol Gregor
Karol Gregor, Olexei I. Motrunich
Studies of non-magnetic impurities in the spin-1/2 Kagome Antiferromagnet
12 pages, 9 figures
null
10.1103/PhysRevB.77.184423
null
cond-mat.str-el
null
Motivated by recent experiments on ZnCu$_3$(OH)$_6$Cl$_2$, we study the inhomogeneous Knight shifts (local susceptibilities) of spin 1/2 Kagome antiferromagnet in the presence of nonmagnetic impurities. Using high temperature series expansion, we calculate the local susceptibility and its histogram down to about T=0.4J. At low temperatures, we explore a Dirac spin liquid proposal and calculate the local susceptibility in the mean field and beyond mean field using Gutzwiller projection, finding the overall picture to be consistent with the NMR experiments.
[ { "version": "v1", "created": "Sun, 3 Feb 2008 20:41:01 GMT" } ]
2009-11-13T00:00:00
[ [ "Gregor", "Karol", "" ], [ "Motrunich", "Olexei I.", "" ] ]
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802.03
Bo Yang
Bo Yang
A characterization of Koiso's typed solitons
8 pages
null
null
null
math.DG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
By extending Koiso's examples to the non-compact case, we construct complete gradient Kahler-Ricci solitons of various types on certain holomorphic line bundles over compact Kahler-Einstein manifolds. Moreover, a uniformization result on steady gradient Kahler-Ricci solitons with non-negative Ricci curvature is obtained under additional assumptions.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 18:00:45 GMT" } ]
2008-02-05T00:00:00
[ [ "Yang", "Bo", "" ] ]
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802.0301
Yukio Tomozawa
Yukio Tomozawa
High energy cosmic rays, gamma rays and neutrinos from AGN
4 pages, no figures
Mod.Phys.Lett.A23:1991-1997,2008
10.1142/S0217732308027278
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The author reviews a model for the emission of high energy cosmic rays, gamma-rays and neutrinos from AGN (Active Galactic Nuclei) that he has proposed since 1985. Further discussion of the knee energy phenomenon of the cosmic ray energy spectrum requires the existence of a heavy particle with mass in the knee energy range. A possible method of detecting such a particle in the Pierre Auger Project is suggested. Also presented is a relation between the spectra of neutrinos and gamma-rays emitted from AGN. This relation can be tested by high energy neutrino detectors such as ICECUBE, the Mediterranean Sea Detector and possibly by the Pierre Auger Project.
[ { "version": "v1", "created": "Sun, 3 Feb 2008 20:44:39 GMT" } ]
2009-06-23T00:00:00
[ [ "Tomozawa", "Yukio", "" ] ]
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802.0302
Elena D'Onghia
Elena D'Onghia (University of Zurich)
Breaking up the Magellanic Group into the Milky Way Halo: Understanding the Local Dwarf Galaxy Properties
ApJ Letter submitted. The title has been corrected
null
null
null
astro-ph
null
We use a numerical simulation of a loose group containing a Milky Way halo to probe that in the hierarchical universe the Magellanic Clouds and some dSphs have been accreted into the Milky Way halo from a late infalling group of dwarfs. Our simulations show that the tidal breakup of the Magellanic group occurs before it enters the Milky Way halo. Only half of the satellites contributed from the group are predicted to be inside the Milky Way virial radius. Half of its subhalos survive outside the current virial radius in the form of satellites, whereas the remaining material contributes to the diffuse Milky Way halo. At z~0 the disrupted group contributes less than 10% to the Milky Way halo mass but 20% of the brightest dwarf galaxies of the Milky Way have been part of this group. This scenario points out that some dSphs might have been form away from giant spirals and been accreted already as spheroids, by a late infall group in contrast with the classical picture of tidal stripping of dSph formation models. This would naturally explain several peculiarities of the local dSph: why Draco and the other luminous dSphs exist compared to other ultra-faint satellite galaxies, the location of Tucana and Cetus in the outskirts of the Local Group and the mismatch in metallicity between the stellar halo of the Milky Way and the dwarf galaxies that many have suspected dissolved to build it.
[ { "version": "v1", "created": "Sun, 3 Feb 2008 21:00:06 GMT" }, { "version": "v2", "created": "Tue, 5 Feb 2008 18:50:15 GMT" } ]
2008-02-05T00:00:00
[ [ "D'Onghia", "Elena", "", "University of Zurich" ] ]
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