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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.
| [
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[
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""
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""
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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.
| [
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"version": "v1",
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] | 2008-05-20T00:00:00 | [
[
"Brandt",
"P. N.",
""
],
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"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 $e_1(\mathcal{A})$.
| [
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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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0.0560130142,
-0.0254534986,
0.0878235027,
-0.0470774844,
0.0082717482,
0.105898805,
0.0805218965,
0.0241259336,
0.0228494294,
0.0303297453,
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0.0017009422,
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0.0134032965,
0.0077802944,
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0.0574937575,
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0.0270108338,
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0.007090982,
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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",
""
]
] | [
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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",
""
]
] | [
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] |
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"
]
] | [
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] |
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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-0.0812695995
] |
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",
""
]
] | [
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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",
""
]
] | [
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] |
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.",
""
]
] | [
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] |
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",
""
]
] | [
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] |
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.
| [
{
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},
{
"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.",
""
]
] | [
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] |
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"
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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"
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] | 2008-02-05T00:00:00 | [
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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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