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712.2879
Augusta Abrahamse
Augusta Abrahamse, Andreas Albrecht, Michael Barnard, Brandon Bozek
Exploring Parameter Constraints on Quintessential Dark Energy: the Pseudo-Nambu Goldstone Boson Model
11 pages including 11 figures and 2 appendices
Phys.Rev.D77:103503,2008
10.1103/PhysRevD.77.103503
null
astro-ph
null
We analyze the constraining power of future dark energy experiments for Pseudo-Nambu Goldstone Boson (PNGB) quintessence. Following the Dark Energy Task Force methodology, we forecast data for three experimental ``stages'': Stage 2 represents in-progress projects relevant to dark energy; Stage 3 refers to medium sized experiments; Stage 4 comprises larger projects. We determine the posterior probability distribution for the parameters of the PNGB model using Markov Chain Monte Carlo analysis. Utilizing data generated on a $\Lambda CDM$ cosmology, we find that the relative power of the different data stages on PNGB quintessence is roughly comparable to the DETF results for the $w_0-w_a$ parametrization of dark energy. We also generate data based on a PNGB cosmological model that is consistent with a $\Lambda CDM$ fiducial model at Stage 2. We find that Stage 4 data based on this PNGB fiducial model will rule out a cosmological constant by at least $3 \sigma$.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 06:01:28 GMT" } ]
2010-04-08T00:00:00
[ [ "Abrahamse", "Augusta", "" ], [ "Albrecht", "Andreas", "" ], [ "Barnard", "Michael", "" ], [ "Bozek", "Brandon", "" ] ]
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712.288
Roberto Maiolino
R. Maiolino, T. Nagao, A. Grazian, F. Cocchia, A. Marconi, F. Mannucci, A. Cimatti, A. Pipino, S. Ballero, A. Fontana, G.L. Granato, F. Matteucci, G. Pastorini, L. Pentericci, G. Risaliti, M. Salvati, L. Silva
The evolution of the mass-metallicity relation at z~3
6 pages, 4 figures, to appear in the proceedings of "A Century of Cosmology: Past, Present and Future" (Venezia, August 2007)
Nuovo Cim.B122:935-940,2007
10.1393/ncb/i2008-10424-y
null
astro-ph
null
We present preliminary results of an ESO-VLT large programme (AMAZE) aimed at determining the evolution of the mass-metallicity relation at z~3 by means of deep near-IR spectroscopy. Gas metallicities and stellar masses are measured for an initial sample of nine star forming galaxies at z~3.3. When compared with previous surveys, the mass-metallicity relation inferred at z~3.3 shows an evolution significantly stronger than observed at lower redshifts. There are also some indications that the metallicity evolution of low mass galaxies is stronger relative to high mass systems, an effect which can be considered as the chemical version of the galaxy downsizing. The mass-metallicity relation observed at z~3.3 is difficult to reconcile with the predictions of some hierarchical evolutionary models. We shortly discuss the possible implications of such discrepancies.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 05:30:53 GMT" } ]
2010-11-11T00:00:00
[ [ "Maiolino", "R.", "" ], [ "Nagao", "T.", "" ], [ "Grazian", "A.", "" ], [ "Cocchia", "F.", "" ], [ "Marconi", "A.", "" ], [ "Mannucci", "F.", "" ], [ "Cimatti", "A.", "" ], [ "Pipino", "A.", "" ], [ "Ballero", "S.", "" ], [ "Fontana", "A.", "" ], [ "Granato", "G. L.", "" ], [ "Matteucci", "F.", "" ], [ "Pastorini", "G.", "" ], [ "Pentericci", "L.", "" ], [ "Risaliti", "G.", "" ], [ "Salvati", "M.", "" ], [ "Silva", "L.", "" ] ]
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712.2881
Denes Petz
Denes Petz, V.E. Sandor Szabo
From quasi-entropy to skew information
12 pages
null
null
null
math.FA math-ph math.MP math.ST stat.TH
null
This paper gives an overview about particular quasi-entropies, generalized quantum covariances, quantum Fisher informations, skew-informations and their relations. The point is the dependence on operator monotone functions. It is proven that a skew-information is the Hessian of a quasi-entropy. The skew-information and some inequalities are extended to a von Neumann algebra setting.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 05:30:21 GMT" } ]
2007-12-19T00:00:00
[ [ "Petz", "Denes", "" ], [ "Szabo", "V. E. Sandor", "" ] ]
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712.2882
Farhad Yusef-Zadeh
F. Yusef-Zadeh, M. Wardle, C. Heinke, C. D. Dowell, D. Roberts, F. K. Baganoff and W. D. Cotton
Simultaneous Chandra, CSO and VLA Observations of Sgr A*: The Nature of Flaring Activity
28 pages, 9 figures, 2 tables, ApJ July 20, 2008
null
10.1086/588803
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Sgr A*, the massive black hole at the center of the Galaxy, varies in radio through X-ray emission on hourly time scales. The flare activity is thought to arise from the innermost region of an accretion flow onto Sgr A*. We present simultaneous light curves of Sgr A* in radio, sub-mm and X-rays that show a possible time delay of 110$\pm17$ minutes between X-ray and 850 $\mu$m suggesting that the sub-mm flare emission is optically thick. At radio wavelengths, we detect time lags of of $20.4\pm6.8, 30\pm12$ and 20$\pm6$ minutes between the flare peaks observed at 13 and 7 mm (22 and 43 GHz) in three different epochs using the VLA. Linear polarization of 1$\pm0.2$% and 0.7$\pm0.1$% is detected at 7 and 13 mm, respectively, when averaged over the entire observation on 2006 July 17. A simple model of a bubble of synchrotron emitting electrons cooling via adiabatic expansion can explain the time delay between various wavelengths, the asymmetric shape of the light curves, and the observed polarization of the flare emission at 43 and 22 GHz. The derived physical quantities that characterize the emission give an expansion speed of v$_{exp} \sim 0.003-0.1$c, magnetic field of B$\sim$10-70 Gauss and particle spectral index p$\sim$1-2. These parameters suggest that the associated plasma cannot escape from Sgr A* unless it has a large bulk motion.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 05:39:42 GMT" }, { "version": "v2", "created": "Thu, 17 Jul 2008 09:08:06 GMT" } ]
2009-11-13T00:00:00
[ [ "Yusef-Zadeh", "F.", "" ], [ "Wardle", "M.", "" ], [ "Heinke", "C.", "" ], [ "Dowell", "C. D.", "" ], [ "Roberts", "D.", "" ], [ "Baganoff", "F. K.", "" ], [ "Cotton", "W. D.", "" ] ]
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712.2883
Amanda Karakas
Amanda Karakas (ANU), Hye Young Lee (Argonne), Maria Lugaro (Utrecht), Joachim Goerres (JINA, Notre Dame), Michael Wiescher (JINA, Notre Dame)
The impact of the 18F(a,p)21Ne reaction on asymptotic giant branch nucleosynthesis
9 pages, accepted for publication in ApJ
null
10.1086/528840
null
astro-ph
null
We present detailed models of low and intermediate-mass asymptotic giant branch (AGB) stars with and without the 18F(a,p)21Ne reaction included in the nuclear network, where the rate for this reaction has been recently experimentally evaluated for the first time. The lower and recommended measured rates for this reaction produce negligible changes to the stellar yields, whereas the upper limit of the rate affects the production of 19F and 21Ne. The stellar yields increase by ~50% to up to a factor of 4.5 for 19F, and by factors of ~2 to 9.6 for 21Ne. While the 18}F(a,p)21Ne reaction competes with 18O production, the extra protons released are captured by 18O to facilitate the 18O(p,a)15N(a,g)19F chain. The higher abundances of 19F obtained using the upper limit of the rate helps to match the [F/O] ratios observed in AGB stars, but only for large C/O ratios. Extra-mixing processes are proposed to help to solve this problem. Some evidence that the 18F(a,p)21Ne rate might be closer to its upper limit is provided by the fact that the higher calculated 21Ne/22Ne ratios in the He intershell provide an explanation for the Ne isotopic composition of silicon-carbide grains from AGB stars. This needs to be confirmed by future experiments of the 18F(a,p)21Ne reaction rate. The availability of accurate fluorine yields from AGB stars will be fundamental for interpreting observations of this element in carbon-enhanced metal-poor stars.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 05:41:36 GMT" } ]
2009-11-13T00:00:00
[ [ "Karakas", "Amanda", "", "ANU" ], [ "Lee", "Hye Young", "", "Argonne" ], [ "Lugaro", "Maria", "", "Utrecht" ], [ "Goerres", "Joachim", "", "JINA, Notre Dame" ], [ "Wiescher", "Michael", "", "JINA, Notre Dame" ] ]
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712.2884
Brandon Bozek
Brandon Bozek, Augusta Abrahamse, Andreas Albrecht, and Michael Barnard
Exploring Parameter Constraints on Quintessential Dark Energy: The Exponential Model
11 pages including 10 figures
Phys.Rev.D77:103504,2008
10.1103/PhysRevD.77.103504
null
astro-ph
null
We present an analysis of a scalar field model of dark energy with an exponential potential using the Dark Energy Task Force (DETF) simulated data models. Using Markov Chain Monte Carlo sampling techniques we examine the ability of each simulated data set to constrain the parameter space of the exponential potential for data sets based on a cosmological constant and a specific exponential scalar field model. We compare our results with the constraining power calculated by the DETF using their ``$w_0-w_a$'' parametrization of the dark energy. We find that respective increases in constraining power from one stage to the next produced by our analysis give results consistent with DETF results. To further investigate the potential impact of future experiments, we also generate simulated data for an exponential model background cosmology which can not be distinguished from a cosmological constant at DETF ``Stage 2'', and show that for this cosmology good DETF Stage 4 data would exclude a cosmological constant by better than 3$\sigma$.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 05:46:46 GMT" } ]
2010-04-08T00:00:00
[ [ "Bozek", "Brandon", "" ], [ "Abrahamse", "Augusta", "" ], [ "Albrecht", "Andreas", "" ], [ "Barnard", "Michael", "" ] ]
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712.2885
Marco Ajello
M. Ajello, J. Greiner, G. Kanbach, A. Rau, A. W. Strong, and J. A. Kennea
BAT X-ray Survey - I: Methodology and X-ray Identification
35 pages, 10 figures, Accepted for publication in ApJ. 1st paper in a series of three
null
10.1086/529418
null
astro-ph
null
We applied the Maximum Likelihood method, as an image reconstruction algorithm, to the BAT X-ray Survey (BXS). This method was specifically designed to preserve the full statistical information in the data and to avoid mosaicking of many exposures with different pointing directions, thus reducing systematic errors when co-adding images. We reconstructed, in the 14-170 keV energy band, the image of a 90x90 deg$^2$ sky region, centered on (RA,DEC)=105$^{\circ}$,-25$^{\circ}$, which BAT surveyed with an exposure time of $\sim1$ Ms (in Nov. 2005). The best sensitivity in our image is $\sim0.85$ mCrab or $2.0\times 10^{-11}$ erg cm$^{-2}$. We detect 49 hard X-ray sources above the 4.5 $\sigma$ level; of these, only 12 were previously known as hard X-ray sources ($>$15 keV). Swift/XRT observations allowed us to firmly identify the counterparts for 15 objects, while 2 objects have Einstein IPC counterparts \citep{harris90}; in addition to those, we found a likely counterpart for 13 objects by correlating our sample with the ROSAT All-Sky Survey Bright Source Catalog \citep{voges99}. 7 objects remain unidentified. Analysis of the noise properties of our image shows that $\sim75$% of the area is surveyed to a flux limit of $\sim$1 mCrab. This study shows that the coupling of the Maximum Likelihood method to the most sensitive, all-sky surveying, hard X-ray instrument, BAT, is able to probe for the first time the hard X-ray sky to the mCrab flux level. The successful application of this method to BAT demonstrates that it could also be applied with advantage to similar instruments like INTEGRAL-IBIS.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 05:53:26 GMT" } ]
2009-11-13T00:00:00
[ [ "Ajello", "M.", "" ], [ "Greiner", "J.", "" ], [ "Kanbach", "G.", "" ], [ "Rau", "A.", "" ], [ "Strong", "A. W.", "" ], [ "Kennea", "J. A.", "" ] ]
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712.2886
Vishnu Bannur M
Vishnu M. Bannur
Self-consistent quasiparticle model for 2, 3 and (2+1) flavor QGP
9 pages, 7 figures, article
Phys.Rev.C78:045206,2008
10.1103/PhysRevC.78.045206
null
hep-ph
null
Quasi-particle model of quark gluon plasma is the statistical mechanics of particles with medium dependent mass, related to plasma frequency, which was proposed to describe the thermodynamics of the medium itself. At relativistic limit the plasma frequency depends on number density and temperature. The number density is a thermodynamic quantity of the medium which in turn depends on plasma frequency. Hence, one need to solve this problem self-consistently, instead of using perturbative expressions for plasma frequency. Here we carry out such a self-consistent calculations using our, recently developed, a new formulations of quasiparticle model. By adjusting a single parameter for each system, a remarkably good fit to lattice QCD results are obtained for 2, 3 and (2+1) flavor quark gluon plasma systems, first, with zero chemical potential. Then, it is extended to systems with finite chemical potential and fits very well the lattice results without any new parameter.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 06:32:46 GMT" } ]
2008-11-26T00:00:00
[ [ "Bannur", "Vishnu M.", "" ] ]
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712.2887
Pablo A. Parrilo
Pablo A. Parrilo, Ali Jadbabaie
Approximation of the joint spectral radius using sum of squares
18 pages, 1 figure
Linear Algebra and its Applications, Vol. 428, No. 10, pp. 2385-2402, 2008.
10.1016/j.laa.2007.12.027
null
math.OC
null
We provide an asymptotically tight, computationally efficient approximation of the joint spectral radius of a set of matrices using sum of squares (SOS) programming. The approach is based on a search for an SOS polynomial that proves simultaneous contractibility of a finite set of matrices. We provide a bound on the quality of the approximation that unifies several earlier results and is independent of the number of matrices. Additionally, we present a comparison between our approximation scheme and earlier techniques, including the use of common quadratic Lyapunov functions and a method based on matrix liftings. Theoretical results and numerical investigations show that our approach yields tighter approximations.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 06:43:12 GMT" } ]
2008-03-23T00:00:00
[ [ "Parrilo", "Pablo A.", "" ], [ "Jadbabaie", "Ali", "" ] ]
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712.2888
David Poulin
David Poulin, Jean-Pierre Tillich, and Harold Ollivier
Quantum serial turbo-codes
24 pages, 15 figures, Published version
IEEE Transactions on Information Theory 55, p. 2776 (2009)
null
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a theory of quantum serial turbo-codes, describe their iterative decoding algorithm, and study their performances numerically on a depolarization channel. Our construction offers several advantages over quantum LDPC codes. First, the Tanner graph used for decoding is free of 4-cycles that deteriorate the performances of iterative decoding. Secondly, the iterative decoder makes explicit use of the code's degeneracy. Finally, there is complete freedom in the code design in terms of length, rate, memory size, and interleaver choice. We define a quantum analogue of a state diagram that provides an efficient way to verify the properties of a quantum convolutional code, and in particular its recursiveness and the presence of catastrophic error propagation. We prove that all recursive quantum convolutional encoder have catastrophic error propagation. In our constructions, the convolutional codes have thus been chosen to be non-catastrophic and non-recursive. While the resulting families of turbo-codes have bounded minimum distance, from a pragmatic point of view the effective minimum distances of the codes that we have simulated are large enough not to degrade the iterative decoding performance up to reasonable word error rates and block sizes. With well chosen constituent convolutional codes, we observe an important reduction of the word error rate as the code length increases.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 06:50:52 GMT" }, { "version": "v2", "created": "Wed, 10 Jun 2009 13:09:01 GMT" } ]
2009-06-10T00:00:00
[ [ "Poulin", "David", "" ], [ "Tillich", "Jean-Pierre", "" ], [ "Ollivier", "Harold", "" ] ]
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712.2889
Yu-Feng Zhou
Yue-Liang Wu, Yu-Feng Zhou and Ci Zhuang
Constraining Charming Penguins in Charmless B Decays
22 pages, 6 figures, references added
J.Phys.G37:025006,2010
10.1088/0954-3899/37/2/025006
KIAS-P07092
hep-ph
null
We discuss the correlations of charming penguin contributions to $B\to\pi\pi$, $\pi K$ and KK using approximate flavor SU(3) symmetry. Strong constraints are found from the direct CP asymmetries especially in $\pi K$ modes. We make a global fit to the latest data and find that only a small charming penguin is allowed, and the size of color-suppressed tree amplitude (C) relative to tree amplitudes (T) remains large $C/T\simeq0.6$, which disfavors the possibility of a large charming penguin as an explanation for the $\pi\pi$ puzzle. We show that a small charming penguin can still have sizable effect in the time-dependence CP asymmetries in KK mode.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 07:33:31 GMT" }, { "version": "v2", "created": "Sun, 23 Dec 2007 07:54:01 GMT" } ]
2010-01-21T00:00:00
[ [ "Wu", "Yue-Liang", "" ], [ "Zhou", "Yu-Feng", "" ], [ "Zhuang", "Ci", "" ] ]
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712.289
Levshakov
S.A. Levshakov, D. Reimers, M.G. Kozlov, S.G. Porsev, P. Molaro
A new approach for testing variations of fundamental constants over cosmic epochs using FIR fine-structure lines
5 pages, to appear in A&A main journal
Astron. & Astrophys, 479, 719 (2008)
10.1051/0004-6361:20079116
null
astro-ph physics.atom-ph
null
Aims. To obtain limits on the variation of the fine-structure constant alpha and the electron-to-proton mass ratio mu over different cosmological epochs. Methods. A new approach based on the comparison of redshifts of far infrared (FIR) fine-structure lines and low-lying rotational transitions in CO is proposed which is in principle more sensitive by a factor of 10 compared to QSO metal absorption lines. Results. Estimations of the quotient F = alpha^2/mu obtained for two distant quasars J1148+5251 (z = 6.42) and BR1202-0725 (z = 4.69) provide Delta F/F = (0.1+/-1.0)10^{-4} and (1.4+/-1.5)10^{-4}, respectively. The obtained limits are consistent with no variation of physical constants at the level of 0.01% over a period of 13 Gyr. Conclusions. Upcoming observations of quasars and distant galaxies in FIR fine-structure lines of different species and in CO low rotational lines at the SOFIA, HSO, and ALMA are expected to improve the current limit by, at least, an order of magnitude.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 07:33:15 GMT" } ]
2009-09-01T00:00:00
[ [ "Levshakov", "S. A.", "" ], [ "Reimers", "D.", "" ], [ "Kozlov", "M. G.", "" ], [ "Porsev", "S. G.", "" ], [ "Molaro", "P.", "" ] ]
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712.2891
Farrukh Mukhamedov M.
Farrukh Mukhamedov, Mansoor Saburov
On homotopy of volterrian quadratic stochastic operators
12 pages
null
null
null
math.DS math.FA
null
In the present paper we introduce a notion of homotopy of two Volterra operators which is related to fixed points of such operators. It is establish a criterion when two Volterra operators are homotopic, as a consequence we obtain that the corresponding tournaments of that operators are the same. This, due to \cite{Ga1}, gives us a possibility to know some information about the trajectory of homotopic Volterra operators. Moreover, it is shown that any Volterra q.s.o. given on a face has at least two homotopic extension to the whole simplex.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 07:39:14 GMT" } ]
2007-12-19T00:00:00
[ [ "Mukhamedov", "Farrukh", "" ], [ "Saburov", "Mansoor", "" ] ]
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712.2892
Tomohito Morita
Tomohito Morita
Hilbert schemes of finite abelian group orbits and Grobner fans
13 pages, 3 figures
null
null
null
math.AG math.AC
null
Let $G$ be a finite abelian subgroup of $PGL(r-1,K)=\mathrm{Aut}(\P^{r-1}_K)$. In this paper, we prove that the normalization of the $G$-orbit Hilbert scheme $\Hilb^G(\P^{r-1})$ is described as a toric variety, which corresponds to the Gr\"obner fan for some homogeneous ideal $I$ of $K[x_1, ..., x_r]$.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 07:41:29 GMT" } ]
2007-12-19T00:00:00
[ [ "Morita", "Tomohito", "" ] ]
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712.2893
Sebastiano Pennisi
M.C. Carrisi, M.A. Mele, S. Pennisi
Extended Thermodynamics for dense gases and macromolecular fluids, obtained through a non relativistic limit
null
null
null
null
math-ph math.MP
null
In this paper we consider the 14 moments model of Extended Thermodynamics for dense gases and macromolecular fluids. Solutions of the restrictions imposed by the entropy principle and that of Galilean relativity for such a model have been until now obtained in literature only in an approximate manner up to a certain order with respect to thermodynamic equilibrium; for more restrictive models they have been obtained up to whatever order, but by using Taylor expansions around equilibrium and without proving convergence. Here we have found an exact solution without using expansions. The idea has been to write firstly a relativistic model, for which it is easy to impose the Einsteinian relativity principle, and then taking its non relativistic limit.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 07:51:09 GMT" } ]
2007-12-19T00:00:00
[ [ "Carrisi", "M. C.", "" ], [ "Mele", "M. A.", "" ], [ "Pennisi", "S.", "" ] ]
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712.2894
Sergey Kozyrev
S.M.Kozyrev
A D-dimensional Heckmann-like solution of Jordan-Brans-Dicke theory
5 pages
null
null
null
gr-qc
null
In this short letter we present a some rigorous vacuum solutions of the D-dimensional Jordan-Brans-Dicke field equations. In contrast with the well known Brans-Dicke solutions, to the search of static and spherically symmetric space-time we choose the widespread Hilbert coordinates.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 08:02:04 GMT" } ]
2007-12-19T00:00:00
[ [ "Kozyrev", "S. M.", "" ] ]
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712.2895
Ansgar Denner
Mariano Ciccolini, Ansgar Denner, Stefan Dittmaier
Electroweak and QCD corrections to Higgs-boson production in vector-boson fusion at the LHC
6 pages, LaTeX, 4 postscript figures, to appear in the proceedings of the "8th International Symposium on Radiative Corrections (RADCOR07)", Florence, Italy, October 1-5, 2007
PoSRADCOR2007:014,2007
null
MPP-2007-190, PSI-PR-07-12, UWThPh-2007-29
hep-ph
null
Radiative corrections of strong and electroweak interactions are presented at next-to-leading order for Higgs-boson production in the weak-boson-fusion channel at the LHC. The calculation includes all weak-boson fusion and quark-antiquark annihilation diagrams as well as all related interferences. The electroweak corrections, which also include real corrections from incoming photons and leading heavy-Higgs-boson effects at two-loop order, are of the same size as the QCD corrections, viz. typically at the level of 5-10% for a Higgs-boson mass up to \sim 700 GeV. In general, they do not simply rescale differential distributions, but induce distortions at the level of 10%. The discussed corrections have been implemented in a flexible Monte Carlo event generator.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 08:05:26 GMT" } ]
2009-04-14T00:00:00
[ [ "Ciccolini", "Mariano", "" ], [ "Denner", "Ansgar", "" ], [ "Dittmaier", "Stefan", "" ] ]
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712.2896
Dr A. N. Mitra
A. N. Mitra
Dynamics Of Proton Spin : Role Of $qqq$ Force
tex file, 18 pp on dvi
null
null
null
hep-ph
null
The analytic structure of the $qqq$ wave function, obtained recently in the high momentum regime of QCD, is employed for the formulation of baryonic transition amplitudes via quark loops. A new aspect of this study is the role of a direct ($Y$-shaped, Mercedes-Benz type) $qqq$ force in generating the $qqq$ wave function. The dynamics is that of a Salpeter-like equation (3D support for the kernel) formulated covariantly on the light front, a la Markov-Yukawa Transversality Principle (MYTP) which warrants a 2-way interconnection between the 3D and 4D Bethe-Salpeter (BSE) forms for 2 as well as 3 fermion quarks. The dynamics of this 3-body force shows up through a characteristic singularity in the hypergeometric differential equation for the 3D wave function $\phi$, corresponding to a $negative$ eigenvalue of the spin operator $i \sigma_1.\sigma_2\times \sigma_3$ which is an integral part of the $qqq$ force. As a first application of this wave function to the problem of the proton spin anomaly, the two-gluon contribution to the anomaly yields an estimate of the right sign, although somewhat smaller in magnitude. Keywords: 3bodyforce; proton-spin; 2gluon anomaly; fractional correction $\theta$
[ { "version": "v1", "created": "Tue, 18 Dec 2007 08:12:22 GMT" } ]
2007-12-19T00:00:00
[ [ "Mitra", "A. N.", "" ] ]
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712.2897
Young-Woo Son
Seungchul Kim, Jisoon Ihm, Hyoung Joon Choi, Young-Woo Son
Origins of anomalous electronic structures of epitaxial graphene on silicon carbide
Additional references added; published version; 4 pages, 4 figures
Phys. Rev. Lett. 100, 176802 (2008)
10.1103/PhysRevLett.100.176802
null
cond-mat.mtrl-sci cond-mat.mes-hall
null
On the basis of first-principles calculations, we report that a novel interfacial atomic structure occurs between graphene and the surface of silicon carbide, destroying the Dirac point of graphene and opening a substantial energy gap there. In the calculated atomic structures, a quasi-periodic $6\times 6$ domain pattern emerges out of a larger commensurate $6\sqrt{3}\times6\sqrt{3}R30^\circ$ periodic interfacial reconstruction, resolving a long standing experimental controversy on the periodicity of the interfacial superstructures. Our theoretical energy spectrum shows a gap and midgap states at the Dirac point of graphene, which are in excellent agreement with the recently-observed anomalous angle-resolved photoemission spectra. Beyond solving unexplained issues of epitaxial graphene, our atomistic study may provide a way to engineer the energy gaps of graphene on substrates.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 08:27:21 GMT" }, { "version": "v2", "created": "Tue, 29 Apr 2008 23:50:40 GMT" } ]
2008-04-30T00:00:00
[ [ "Kim", "Seungchul", "" ], [ "Ihm", "Jisoon", "" ], [ "Choi", "Hyoung Joon", "" ], [ "Son", "Young-Woo", "" ] ]
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712.2898
Eyer Laurent
P.G. Willemsen, L. Eyer
A study of supervised classification of Hipparcos variable stars using PCA and Support Vector Machines
null
null
null
VSWG-PW-001, 2005
astro-ph
null
We report on the automated classification of Hipparcos variable stars by a supervised classification algorithm known as Support Vector Machines. The dataset comprised about 3200 stars, each characterized by 51 features. These are the B-V and V-I colours, the skewness of the lightcurve, the median subtracted 10-percentiles and forty bins from the Fourier envelope of the lightcurve. We also tested whether the classification performance can be improved by using the most significant principal components calculated from this dataset. We show that the overall classification performance (as measured by the fraction of true positives) on the original dataset is of the order of 62%. For about 9 of the 18 different variability classes, the classification accuracy is significantly larger than 60% (up to 98%). Introducing principal components does not significantly improve this result. We further find that many of the different variability classes are not very distinct and possibly poorly defined, i.e. there exists a considerable class overlap. It is concluded that this `contamination' of the template set implies minimum errors and thus degrades the overall performance.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 08:32:22 GMT" } ]
2007-12-19T00:00:00
[ [ "Willemsen", "P. G.", "" ], [ "Eyer", "L.", "" ] ]
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712.2899
Ying-Ji He
Y. J. He, Boris A. Malomed, and H. Z. Wang
Fusion of necklace-ring patterns into vortex and fundamental solitons in dissipative media
4 figures
published in Optics Express 15, 17501-17508 (2007)
10.1364/OE.15.017502
null
nlin.PS
null
We demonstrate that necklace-shaped arrays of localized spatial beams can merge into stable fundamental or vortex solitons in a generic model of laser cavities, based on the two-dimensional complex Ginzburg-Landau equation with the cubic-quintic nonlinearity. The outcome of the fusion is controlled by the number of beads in the initial necklace, 2N, and its topological charge, M. We predict and confirm by systematic simulations that the vorticity of the emerging soliton is the absolute value of difference of N and M. Threshold characteristics of the fusion are found and explained too. If the initial radius of the array (R0) is too large, it simply keeps the necklace shape (if R0 is somewhat smaller, the necklace features a partial fusion), while, if R0 is too small, the array disappears.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 08:34:17 GMT" } ]
2009-11-13T00:00:00
[ [ "He", "Y. J.", "" ], [ "Malomed", "Boris A.", "" ], [ "Wang", "H. Z.", "" ] ]
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712.29
Vsevolod Adler
V.E. Adler
Classification of integrable Volterra type lattices on the sphere. Isotropic case
16 pages
J. Phys. A: Math. Theor. 41 (2008) 145201
10.1088/1751-8113/41/14/145201
null
nlin.SI
null
The symmetry approach is used for classification of integrable isotropic vector Volterra lattices on the sphere. The list of integrable lattices consists mainly of new equations. Their symplectic structure and associated PDE of vector NLS-type are discussed.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 08:51:57 GMT" } ]
2012-09-13T00:00:00
[ [ "Adler", "V. E.", "" ] ]
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712.2901
Yoav Tsori
Gilad Marcus, Sela Samin, Yoav Tsori
Phase-Separation Transition in Liquid Mixtures Near Charged Objects
final version, includes small changes and typo corrections
J. Chem. Phy. vol 129, 061101 (2008)
10.1063/1.2965906
null
cond-mat.stat-mech cond-mat.soft
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the thermodynamic behavior of nonpolar liquid mixtures in the vicinity of curved charged objects, such as electrodes or charged colloids. For small enough charge on the object, or equivalently, small potential, the dielectrophoretic force leads to enrichment of the more polar liquid close the colloid. However, there is a critical value of charge (or potential), above which a phase-separation transition occurs, and the interface between high- and low-dielectric constant components becomes sharp. Analytical and numerical composition profile are given, and the equilibrium front location as a function of charge or voltage is found. We further employ a simple Cahn-Hilliard type equation to study the dynamics of phase-separation in spatially nonuniform electric fields. We find an exponential relaxation of the composition front location, with a characteristic time depending on the charge, mixture composition and ambient temperature.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 08:50:49 GMT" }, { "version": "v2", "created": "Tue, 12 Aug 2008 08:13:38 GMT" } ]
2009-11-13T00:00:00
[ [ "Marcus", "Gilad", "" ], [ "Samin", "Sela", "" ], [ "Tsori", "Yoav", "" ] ]
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712.2902
Frank M. Rieger
F.M. Rieger, F.A. Aharonian
Variable VHE gamma-ray emission from non-blazar AGNs
4 pages, A&A Letters; typos (r_l) fixed, Journal ref. added
A&A 479 (2008), L5
10.1051/0004-6361:20078706
null
astro-ph
null
The observation of rapidly variable very high energy (VHE) gamma-rays from non-aligned active galactic nuclei (AGNs), as reported from M87, proves challenging for conventional theoretical acceleration and emission models. We re-examine the centrifugal acceleration of particles by rotating jet magnetospheres in the vicinity of accreting supermassive black hole systems and analyze the energy constraints imposed for highly underluminous systems. Applications are presented for conditions expected to be present in the radio galaxy M87, assuming accretion onto the central black hole to occur in an advection-dominated (ADAF) mode. We show that for a highly underluminous source like M87, centrifugally accelerated electrons may reach Lorentz factors up to $\gamma \sim (10^7-10^8)$, allowing inverse Compton (Thomson) upscattering of sub-mm disk photons to the TeV regime. Upscattering of Comptonized disk photons results in a flat TeV spectrum $L_{\nu} \propto \nu^{-\alpha_c}$ with spectral index $\alpha_c \simeq 1.2$. The characteristic variability time scale is of the order $r_{\rm L}/c$, which in the case of M87 corresponds to $\simeq 1.7$ d for a typical light cylinder radius of $r_{\rm L} \simeq 5 r_{\rm s}$. Centrifugal acceleration could thus provide a natural explanation for the challenging VHE emission features in M87. Our results suggest that some advection-dominated accreting (non-blazar) AGNs could well be observable VHE emitting sources. (abridged)
[ { "version": "v1", "created": "Tue, 18 Dec 2007 08:56:43 GMT" }, { "version": "v2", "created": "Tue, 27 May 2008 09:51:51 GMT" } ]
2009-11-13T00:00:00
[ [ "Rieger", "F. M.", "" ], [ "Aharonian", "F. A.", "" ] ]
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712.2903
Vyacheslav Rychkov
Riccardo Barbieri, Lawrence J. Hall, Anastasios Y. Papaioannou, Duccio Pappadopulo, Vyacheslav S. Rychkov
An alternative NMSSM phenomenology with manifest perturbative unification
19 pages, 13 figures; v2: possibility of pseudo-Goldstone below 2m_b threshold added, version published by JHEP
JHEP0803:005,2008
10.1088/1126-6708/2008/03/005
UCB-PTH-06/04
hep-ph
null
Can supersymmetric models with a moderate stop mass be made consistent with the negative Higgs boson searches at LEP, while keeping perturbative unification manifest? The NMSSM achieves this rather easily, but only if extra matter multiplets filling complete SU(5) representations are present at intermediate energies. As a concrete example which makes use of this feature, we give an analytic description of the phenomenology of a constrained NMSSM close to a Peccei-Quinn symmetry point. The related pseudo-Goldstone boson appears in decays of the Higgs bosons and possibly of the lightest neutralino, and itself decays into (b anti-b) and (tau anti-tau).
[ { "version": "v1", "created": "Tue, 18 Dec 2007 09:29:52 GMT" }, { "version": "v2", "created": "Thu, 6 Mar 2008 12:26:24 GMT" } ]
2008-11-26T00:00:00
[ [ "Barbieri", "Riccardo", "" ], [ "Hall", "Lawrence J.", "" ], [ "Papaioannou", "Anastasios Y.", "" ], [ "Pappadopulo", "Duccio", "" ], [ "Rychkov", "Vyacheslav S.", "" ] ]
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712.2904
Dimitri Shlyakhtenko
A. Guionnet, V.F.R. Jones, D. Shlyakhtenko
Random matrices, free probability, planar algebras and subfactors
Minor changes
null
null
null
math.OA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Using a family of graded algebra structures on a planar algebra and a family of traces coming from random matrix theory, we obtain a tower of non-commutative probability spaces, naturally associated to a given planar algebra. The associated von Neumann algebras are II$_{1}$ factors whose inclusions realize the given planar algebra as a system of higher relative commutants. We thus give an alternative proof to a result of Popa that every planar algebra can be realized by a subfactor.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 08:58:13 GMT" }, { "version": "v2", "created": "Tue, 8 Jul 2008 19:10:41 GMT" } ]
2008-07-08T00:00:00
[ [ "Guionnet", "A.", "" ], [ "Jones", "V. F. R.", "" ], [ "Shlyakhtenko", "D.", "" ] ]
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712.2905
Jasjeet Singh Bagla
J. S. Bagla (HRI, Allahabad), Jaswant Yadav, T. R. Seshadri (Dept. of Physics and Astrophysics, University of Delhi)
Fractal Dimensions of a Weakly Clustered Distribution and the Scale of Homogeneity
10 pages, 5 figures. accepted for publication in the MNRAS
Mon.Not.Roy.Astron.Soc.390:829,2007
10.1111/j.1365-2966.2008.13793.x
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Homogeneity and isotropy of the universe at sufficiently large scales is a fundamental premise on which modern cosmology is based. Fractal dimensions of matter distribution is a parameter that can be used to test the hypothesis of homogeneity. In this method, galaxies are used as tracers of the distribution of matter and samples derived from various galaxy redshift surveys have been used to determine the scale of homogeneity in the Universe. Ideally, for homogeneity, the distribution should be a mono-fractal with the fractal dimension equal to the ambient dimension. While this ideal definition is true for infinitely large point sets, this may not be realised as in practice, we have only a finite point set. The correct benchmark for realistic data sets is a homogeneous distribution of a finite number of points and this should be used in place of the mathematically defined fractal dimension for infinite number of points (D) as a requirement for approach towards homogeneity. We derive the expected fractal dimension for a homogeneous distribution of a finite number of points. We show that for sufficiently large data sets the expected fractal dimension approaches D in absence of clustering. It is also important to take the weak, but non-zero amplitude of clustering at very large scales into account. In this paper we also compute the expected fractal dimension for a finite point set that is weakly clustered. Clustering introduces departures in the Fractal dimensions from D and in most situations the departures are small if the amplitude of clustering is small. Features in the two point correlation function, like those introduced by Baryon Acoustic Oscillations (BAO) can lead to non-trivial variations in the Fractal dimensions where the amplitude of clustering and deviations from D are no longer related in a monotonic manner.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 09:26:10 GMT" }, { "version": "v2", "created": "Wed, 9 Jan 2008 04:06:28 GMT" }, { "version": "v3", "created": "Mon, 4 Aug 2008 08:04:48 GMT" } ]
2009-09-10T00:00:00
[ [ "Bagla", "J. S.", "", "HRI, Allahabad" ], [ "Yadav", "Jaswant", "", "Dept. of\n Physics and Astrophysics, University of Delhi" ], [ "Seshadri", "T. R.", "", "Dept. of\n Physics and Astrophysics, University of Delhi" ] ]
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712.2906
Akihisa Hayashi
Y. Ishida, T. Hashimoto, M. Horibe, and A. Hayashi
Local Quantum Pure-state Identification without Classical Knowledge
5 pages, no figures; v2: reference added, representation improved
null
null
null
quant-ph
null
Suppose we want to distinguish two quantum pure states. We consider the case in which no classical knowledge on the two states is given and only a pair of samples of the two states is available. This problem is called quantum pure-state identification problem. Our task is to optimize the mean identification success probability, which is averaged over an independent unitary invariant distribution of the two reference states. In this paper, the two states are assumed bipartite states which are generally entangled. The question is whether the maximum mean identification success probability can be attained by means of an LOCC (Local Operations and Classical Communication) measurement scheme. We will show that this is possible by constructing a POVM which respects the conditions of LOCC.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 09:26:34 GMT" }, { "version": "v2", "created": "Mon, 7 Jan 2008 02:36:34 GMT" } ]
2008-01-07T00:00:00
[ [ "Ishida", "Y.", "" ], [ "Hashimoto", "T.", "" ], [ "Horibe", "M.", "" ], [ "Hayashi", "A.", "" ] ]
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712.2907
Mariusz Krawiec
T. Kwapinski, M. Krawiec, M. Jalochowski
STM tunneling through a quantum wire with a side-attached impurity
16 pages, 6 figures
Phys. Lett. A372, 154 (2008)
10.1016/j.physleta.2007.08.017
null
cond-mat.mes-hall
null
The STM tunneling through a quantum wire (QW) with a side-attached impurity (atom, island) is investigated using a tight-binding model and the nonequilibrium Keldysh Green function method. The impurity can be coupled to one or more QW atoms. The presence of the impurity strongly modifies the local density of states of the wire atoms, thus influences the STM tunneling through all the wire atoms. The transport properties of the impurity itself are also investigated mainly as a function of the wire length and the way it is coupled to the wire. It is shown that the properties of the impurity itself and the way it is coupled to the wire strongly influence the STM tunneling which is reflected in the density of states and differential conductance.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 09:27:53 GMT" } ]
2009-11-13T00:00:00
[ [ "Kwapinski", "T.", "" ], [ "Krawiec", "M.", "" ], [ "Jalochowski", "M.", "" ] ]
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712.2908
Dirk Oliver Theis
Dirk Oliver Theis
The Cops & Robber game on series-parallel graphs
short communication (final draft, small changes)
null
null
null
math.CO
null
The Cops and Robber game is played on undirected finite graphs. $k$ cops and one robber are positioned on vertices and take turn in moving along edges. The cops win if, after a move, a cop and the robber are on the same vertex. A graph is called $k$-copwin, if the cops have a winning strategy. It is known that planar graphs are 3-copwin (Aigner & Fromme, 1984) and that outerplanar graphs are 2-copwin (Clarke, 2002). In this short note, we prove that series-parallel (i.e., graphs with no $K_4$ minor) graphs are 2-copwin. It is a well-known trick in the literature of cops & robber games to define variants of the game which impose restrictions on the possible strategies of the cops (see Clarke, 2002). For our proof, we define the ``cops & robber game with exits''. Our proof yields a winning strategy for the cops.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 09:46:07 GMT" }, { "version": "v2", "created": "Fri, 18 Jan 2008 15:28:56 GMT" } ]
2011-11-10T00:00:00
[ [ "Theis", "Dirk Oliver", "" ] ]
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712.2909
Friedrich Wyrowski
Friedrich Wyrowski
Initial conditions for massive star formation
12 pages, 1 figure, submitted proceedings contribution for "Massive Star Formation: Observations confront Theory" (Heidelberg 2007)
null
null
null
astro-ph
null
In this contribution, our knowledge of the initial conditions under which massive star formation takes place is reviewed. Massive stars are born in massive clumps of giant molecular clouds (GMCs), hence first the properties of GMCs are summarized. As a potentially early stage of molecular clouds, infrared dark clouds have been discovered a decade ago as dark patches in mid-infrared (MIR) images of the Galactic plane and many studies of the physical conditions within them have been conducted recently. Without the guidance of MIR absorption, large scale, unbiased cold dust surveys can be used as well to identify massive cold clumps. In the absence of indicators of ongoing massive star formation, like compact HII regions and bright IR sources, these clumps are the most promising objects for the study of the initial conditions of massive star formation. Current observational approaches to find IR quiet clumps and their physical and chemical properties are summarized.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 09:54:38 GMT" } ]
2007-12-19T00:00:00
[ [ "Wyrowski", "Friedrich", "" ] ]
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712.291
Marco Bartolozzi Dr
M. Bartolozzi, C. Mellen, F. Chan, D. Oliver, T. Di Matteo, T. Aste
Applications of physical methods in high-frequency futures markets
14 Pages and 10 figures. Proceeding to the SPIE conference, 4 - 7 December 2007 Australian National Univ. Canberra, ACT, Australia
null
10.1117/12.758431
null
q-fin.TR physics.data-an physics.soc-ph
null
In the present work we demonstrate the application of different physical methods to high-frequency or tick-by-tick financial time series data. In particular, we calculate the Hurst exponent and inverse statistics for the price time series taken from a range of futures indices. Additionally, we show that in a limit order book the relaxation times of an imbalanced book state with more demand or supply can be described by stretched exponential laws analogous to those seen in many physical systems.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 09:46:21 GMT" } ]
2009-11-13T00:00:00
[ [ "Bartolozzi", "M.", "" ], [ "Mellen", "C.", "" ], [ "Chan", "F.", "" ], [ "Oliver", "D.", "" ], [ "Di Matteo", "T.", "" ], [ "Aste", "T.", "" ] ]
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712.2911
Lewin Mathieu
Philippe Gravejat, Mathieu Lewin and Eric Sere
Ground State and Charge Renormalization in a Nonlinear Model of Relativistic Atoms
37 pages, 1 figure
null
10.1007/s00220-008-0660-9
null
math-ph math.MP
null
We study the reduced Bogoliubov-Dirac-Fock (BDF) energy which allows to describe relativistic electrons interacting with the Dirac sea, in an external electrostatic potential. The model can be seen as a mean-field approximation of Quantum Electrodynamics (QED) where photons and the so-called exchange term are neglected. A state of the system is described by its one-body density matrix, an infinite rank self-adjoint operator which is a compact perturbation of the negative spectral projector of the free Dirac operator (the Dirac sea). We study the minimization of the reduced BDF energy under a charge constraint. We prove the existence of minimizers for a large range of values of the charge, and any positive value of the coupling constant $\alpha$. Our result covers neutral and positively charged molecules, provided that the positive charge is not large enough to create electron-positron pairs. We also prove that the density of any minimizer is an $L^1$ function and compute the effective charge of the system, recovering the usual renormalization of charge: the physical coupling constant is related to $\alpha$ by the formula $\alpha_{\rm phys}\simeq \alpha(1+2\alpha/(3\pi)\log\Lambda)^{-1}$, where $\Lambda$ is the ultraviolet cut-off. We eventually prove an estimate on the highest number of electrons which can be bound by a nucleus of charge $Z$. In the nonrelativistic limit, we obtain that this number is $\leq 2Z$, recovering a result of Lieb. This work is based on a series of papers by Hainzl, Lewin, Sere and Solovej on the mean-field approximation of no-photon QED.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 09:53:27 GMT" } ]
2009-11-13T00:00:00
[ [ "Gravejat", "Philippe", "" ], [ "Lewin", "Mathieu", "" ], [ "Sere", "Eric", "" ] ]
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712.2912
Jonas Kahn
Jonas Kahn
Model selection for quantum homodyne tomography
40 pages, 2 figures, submitted to ESAIM: Probability and Statistics
null
null
null
math.ST stat.TH
null
This paper deals with a non-parametric problem coming from physics, namely quantum tomography. That consists in determining the quantum state of a mode of light through a homodyne measurement. We apply several model selection procedures: penalized projection estimators, where we may use pattern functions or wavelets, and penalized maximum likelihood estimators. In all these cases, we get oracle inequalities. In the former we also have a polynomial rate of convergence for the non-parametric problem. We finish the paper with applications of similar ideas to the calibration of a photocounter, a measurement apparatus counting the number of photons in a beam. Here the mathematical problem reduces similarly to a non-parametric missing data problem. We again get oracle inequalities, and better speed if the photocounter is good.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 09:56:03 GMT" } ]
2007-12-19T00:00:00
[ [ "Kahn", "Jonas", "" ] ]
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712.2913
Michael Entov
Michael Entov, Leonid Polterovich
C^0-rigidity of Poisson brackets
Latex, 11 pages
null
null
null
math.SG math.CA
null
Consider a functional associating to a pair of compactly supported smooth functions on a symplectic manifold the maximum of their Poisson bracket. We show that this functional is lower semi-continuous with respect to the product uniform (C^0) norm on the space of pairs of such functions. This extends previous results of Cardin-Viterbo and Zapolsky. The proof involves theory of geodesics of the Hofer metric on the group of Hamiltonian diffeomorphisms. We also discuss a failure of a similar semi-continuity phenomenon for multiple Poisson brackets of three or more functions.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 09:59:21 GMT" } ]
2007-12-19T00:00:00
[ [ "Entov", "Michael", "" ], [ "Polterovich", "Leonid", "" ] ]
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712.2914
Stefan Schaefer
Thomas DeGrand and Stefan Schaefer
Topological susceptibility in two-flavor QCD
9 pages,7 figures
null
null
COLO-HEP-532, HU-EP-07/63, SFB/CPP-07-8
hep-lat
null
We compute the topological susceptibility in QCD with two flavors of dynamical fermions using numerical simulation with overlap fermions.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 10:01:19 GMT" } ]
2007-12-19T00:00:00
[ [ "DeGrand", "Thomas", "" ], [ "Schaefer", "Stefan", "" ] ]
[ -0.0296892244, 0.0199044887, -0.0603950471, -0.0179406088, -0.0560976192, 0.0527243689, -0.049582161, 0.1193114072, -0.0926026553, -0.0644614324, 0.0119334515, 0.0341483839, -0.0303823594, 0.0784165189, 0.0450305827, 0.0498594157, 0.0574838854, 0.0939889252, 0.1034155414, 0.0373830087, -0.0809118003, -0.1014747694, 0.0055277408, 0.0356732793, -0.0508298017, -0.042604614, 0.0162193272, -0.0544803068, 0.0629827455, 0.0025039453, 0.1563709527, -0.0362046808, -0.0737032145, -0.086318247, -0.054988604, 0.0521236509, -0.0075436048, 0.0832684562, -0.0417728536, -0.0029891389, -0.0485655665, 0.0555431098, -0.0547113493, 0.1175554693, 0.0444991812, -0.0186684001, -0.0136662852, -0.0368747115, -0.0104143331, -0.042234946, 0.1069274172, 0.0617813133, -0.0078208586, -0.0554506928, -0.1550770998, -0.0519388169, 0.0008100999, 0.0325310715, 0.0213716216, -0.1015671864, -0.0854402781, -0.1234702095, 0.0053948904, -0.0040721605, -0.0784165189, -0.0572990477, -0.0527705774, 0.0036764964, 0.0379606187, -0.0408486761, -0.0298047476, -0.0658014864, 0.1173706353, 0.0597019121, 0.0853940696, 0.0471099839, -0.1016596034, 0.0456313007, 0.0430204943, 0.0520774424, -0.0520774424, 0.0409410968, 0.0353036076, -0.0204358902, -0.0908929259, -0.0148677174, 0.0130193606, 0.0025573743, -0.0706072152, -0.0653394014, 0.1146905199, 0.0447071195, -0.0125457197, -0.0415880196, 0.1365935355, -0.0684816092, 0.1377025545, -0.0497669987, -0.1022141129, 0.0110785868, -0.0357425921, 0.0265470184, -0.0482883118, -0.014532702, 0.1034155414, -0.0505063385, -0.0090165138, -0.0221571736, 0.0103854528, -0.0268011689, 0.0780468509, 0.0585929006, -0.0673725903, 0.1065577492, -0.0071912617, -0.0969462916, -0.0175478347, -0.0466941036, -0.0045255851, 0.1060956568, 0.0141745834, -0.0492124893, 0.0083753653, 0.0737956315, -0.0263852887, -0.0793406963, 0.0024981692, -0.1080364361, -0.1205128431, -0.0400169156, 0.0814663097, -0.0603026301, -0.0540182181, 0.0398089774, -0.0018310281, 0.0731487051, 0.0174785201, -0.0111652277, 0.0975008011, -0.075089477, -0.0398782901, -0.0265008099, 0.1210673451, 0.0966690406, 0.0580845997, 0.004170354, 0.0525857396, 0.0985173956, 0.0528629944, 0.0188994445, -0.038191665, -0.0734259561, 0.0235780962, 0.0106396014, -0.0678808913, -0.1070198342, 0.0636296719, 0.0819746107, -0.0023191096, -0.0066829636, -0.0653394014, 0.0954676121, -0.0710230991, 0.0137818074, 0.0592398234, -0.0216604266, -0.1059108227, 0.0842850506, -0.0385382324, -0.1462974101, 0.001167497, -0.0620123595, -0.0607185103, -0.0420963168, 0.0021501584, 0.0334321484, -0.0485655665, -0.1503638029, -0.020921085, 0.0576225109, -0.0071161725, 0.030636508, 0.01197966, -0.0146482252, -0.0899687484, -0.0288343597, 0.0172128193, 0.0009826614, -0.0140937176, -0.0161153581, -0.0377295762, 0.0093919607, 0.0768916309, 0.0469251499, -0.0646462664, -0.1354845315, 0.0117139593, 0.0909391344, 0.0109341834, -0.0089472001, -0.0175247286, -0.0166698638, 0.098794654, -0.0617813133, -0.074534975, 0.1213446036, 0.0561438277, -0.0917708948, -0.0890907794, -0.0669105053, 0.0214640386, 0.05046013, 0.0405252166, 0.0457468219, -0.0627054945, 0.0532326661, -0.0659863278, 0.0414724983, 0.0544803068, 0.1152450219, -0.0226192623, 0.0302899405, -0.0254149009, 0.0457237177, 0.0384920239, -0.0051118606, -0.0446378067, -0.0029183815, -0.0202972647, 0.0464630611, 0.0452385247, 0.0118525857, 0.031329643, -0.087473467, 0.0037111531, -0.074719809, 0.0291809272, -0.0253224839, -0.0546651408, -0.0823904872, -0.111363478, 0.0126843462, 0.0195925776, 0.0615040585, 0.075505361, -0.0549423955, -0.0538333803, -0.0056317109, 0.009726976, -0.0507373847, -0.0889521539, 0.075782612, 0.0144864935, 0.0826677382, 0.0076186941, -0.0785089359 ]
712.2915
Wilfried Schoepe
W. Schoepe
On the Transition to Turbulence of Oscillatory Flow of Liquid Helium-4
null
null
10.1007/s10909-007-9608-2
null
cond-mat.other
null
Oscillating solid bodies have frequently been used for studying the properties of normal and superfluid helium. In particular, the transition from laminar flow to turbulence has attracted much interest recently. The purpose of this note is to review several central features of this transition in oscillatory flow, which have been inaccurately formulated in some recent work.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 10:16:10 GMT" } ]
2009-11-13T00:00:00
[ [ "Schoepe", "W.", "" ] ]
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712.2916
Makoto Natsuume
Makoto Natsuume and Takashi Okamura
Causal hydrodynamics of gauge theory plasmas from AdS/CFT duality
20 pages, ReVTeX4; v3: the sound mode results for SAdS_{4,7} added, an early interpretation based only on the shear mode changed; v6: corrected solution in Appendix B
Phys.Rev.D77:066014,2008; Erratum-ibid.D78:089902,2008
10.1103/PhysRevD.77.066014 10.1103/PhysRevD.78.089902
KEK-TH-1209
hep-th hep-ph nucl-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study causal hydrodynamics (Israel-Stewart theory) of gauge theory plasmas from the AdS/CFT duality. Causal hydrodynamics requires new transport coefficients (relaxation times) and we compute them for a number of supersymmetric gauge theories including the N=4 SYM. However, the relaxation times obtained from the "shear mode" do not agree with the ones from the "sound mode," which implies that the Israel-Stewart theory is not a sufficient framework to describe the gauge theory plasmas.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 16:42:19 GMT" }, { "version": "v2", "created": "Wed, 19 Dec 2007 15:21:40 GMT" }, { "version": "v3", "created": "Fri, 11 Jan 2008 15:56:01 GMT" }, { "version": "v4", "created": "Wed, 19 Mar 2008 05:45:57 GMT" }, { "version": "v5", "created": "Thu, 21 Aug 2008 04:35:45 GMT" }, { "version": "v6", "created": "Wed, 1 Oct 2008 09:55:50 GMT" } ]
2014-11-18T00:00:00
[ [ "Natsuume", "Makoto", "" ], [ "Okamura", "Takashi", "" ] ]
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712.2917
Makoto Natsuume
Makoto Natsuume and Takashi Okamura
Comment on "Viscous hydrodynamics relaxation time from AdS/CFT correspondence"
2 pages, ReVTeX4
null
null
KEK-TH-1210
hep-th hep-ph nucl-th
null
This is a comment to hep-th/0703243. The paper determined the relaxation time tau_pi of the shear viscous stress for the N=4 SYM from AdS/CFT correspondence. The purpose of this comment is to point out that the value of tau_pi is 3 times larger than their result if one takes into account an additional term in the hydrodynamic equation.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 14:52:25 GMT" }, { "version": "v2", "created": "Wed, 19 Mar 2008 05:46:28 GMT" } ]
2008-03-19T00:00:00
[ [ "Natsuume", "Makoto", "" ], [ "Okamura", "Takashi", "" ] ]
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712.2918
Anastasia Doikou
Anastasia Doikou
Non-diagonal reflection for the non-critical XXZ model
8 pages Latex
J.Phys.A41:194007,2008
10.1088/1751-8113/41/19/194007
null
hep-th cond-mat.stat-mech math-ph math.MP nlin.SI
null
The most general physical boundary $S$-matrix for the open XXZ spin chain in the non-critical regime ($\cosh (\eta)>1$) is derived starting from the bare Bethe ansazt equations. The boundary $S$-matrix as expected is expressed in terms of $\Gamma_q$-functions. In the isotropic limit corresponding results for the open XXX chain are also reproduced.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 10:25:05 GMT" } ]
2008-11-26T00:00:00
[ [ "Doikou", "Anastasia", "" ] ]
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712.2919
Martin Castelnovo
Martin Castelnovo (Phys-ENS), Alex Evilevitch (L.U.)
DNA ejection from bacteriophage: towards a general behavior for osmotic suppression experiments
null
The European Physical Journal E 24 (2007) 9-18
10.1140/epje/i2007-10205-5
null
physics.bio-ph
null
We present in this work in vitro measurements of the force ejecting DNA from two distinct bacteriophages (T5 and lambda) using the smotic-suppression technique. Our data are analyzed by revisiting the current theories of DNA packaging in spherical capsids. In particular we show that a simplified analytical model based on bending considerations only is able to account quantitatively for the experimental findings. Physical and biological consequences are discussed.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 10:28:48 GMT" } ]
2007-12-19T00:00:00
[ [ "Castelnovo", "Martin", "", "Phys-ENS" ], [ "Evilevitch", "Alex", "", "L.U." ] ]
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712.292
Philip Greulich
Philip Greulich and Andreas Schadschneider
Single-Bottleneck Approximation for Driven Lattice Gases with Disorder and Open Boundary Conditions
submitted to J. Stat. Mech
J. Stat. Mech. (2008) P04009
10.1088/1742-5468/2008/04/P04009
null
cond-mat.stat-mech
null
We investigate the effects of disorder on driven lattice gases with open boundaries using the totally asymmetric simple exclusion process as a paradigmatic example. Disorder is realized by randomly distributed defect sites with reduced hopping rate. In contrast to equilibrium, even macroscopic quantities in disordered non-equilibrium systems depend sensitively on the defect sample. We study the current as function of the entry and exit rates and the realization of disorder and find that it is, in leading order, determined by the longest stretch of consecutive defect sites (single-bottleneck approximation, SBA). Using results from extreme value statistics the SBA allows to study ensembles with fixed defect density which gives accurate results, e.g. for the expectation value of the current. Corrections to SBA come from effective interactions of bottlenecks close to the longest one. Defects close to the boundaries can be described by effective boundary rates and lead to shifts of the phase transitions. Finally it is shown that the SBA also works for more complex models. As an example we discuss a model with internal states that has been proposed to describe transport of the kinesin KIF1A.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 10:55:54 GMT" } ]
2009-11-13T00:00:00
[ [ "Greulich", "Philip", "" ], [ "Schadschneider", "Andreas", "" ] ]
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712.2921
Nicolas Bessolaz Mr
N. Bessolaz (1), C. Zanni (1), J. Ferreira (1), R. Keppens (2 and 3 and 4), J. Bouvier (1) ((1) Laboratoire d'Astrophysique de Grenoble, Universite Joseph-Fourier, France, (2) Centre for Plasma Astrophysics, K.U.Leuven, Belgium, (3) FOM Institute for Plasma Physics, Rijnhuizen, the Netherlands, (4) Astronomical Institute, Utrecht University)
Accretion funnels onto weakly magnetized young stars
8 pages, 6 figures, accepted in A&A
null
10.1051/0004-6361:20078328
null
astro-ph
null
Aims : We re-examine the conditions required to steadily deviate an accretion flow from a circumstellar disc into a magnetospheric funnel flow onto a slow rotating young forming star. Methods : New analytical constraints on the formation of accretion funnels flows due to the presence of a dipolar stellar magnetic field disrupting the disc are derived. The Versatile Advection Code is used to confirm these constraints numerically. Axisymmetric MHD simulations are performed, where a stellar dipole field enters the resistive accretion disc, whose structure is self-consistently computed. Results : The analytical criterion derived allows to predict a priori the position of the truncation radius from a non perturbative accretion disc model. Accretion funnels are found to be robust features which occur below the co-rotation radius, where the stellar poloidal magnetic pressure becomes both at equipartition with the disc thermal pressure and is comparable to the disc poloidal ram pressure. We confirm the results of Romanova et al. 2002 and find accretion funnels for stellar dipole fields as low as 140 G in the low accretion rate limit of $10^{-9} M_\odot.yr^{-1}$. With our present numerical setup with no disc magnetic field, we found no evidence of winds, neither disc driven nor X-winds, and the star is only spun up by its interaction with the disc. Conclusions : Weak dipole fields, similar in magnitude to those observed, lead to the development of accretion funnel flows in weakly accreting T Tauri stars. However, the higher accretion observed for most T Tauri stars (${\dot M} \sim 10^{-8} M_\odot.yr^{-1}$) requires either larger stellar field strength and/or different magnetic topologies to allow for magnetospheric accretion.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 10:33:45 GMT" } ]
2009-11-13T00:00:00
[ [ "Bessolaz", "N.", "", "2 and 3\n and 4" ], [ "Zanni", "C.", "", "2 and 3\n and 4" ], [ "Ferreira", "J.", "", "2 and 3\n and 4" ], [ "Keppens", "R.", "", "2 and 3\n and 4" ], [ "Bouvier", "J.", "" ] ]
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712.2922
Mahir S. Hussein
M. S. Hussein
Absorption-Fluctuation Theorem for Nuclear Reactions: Brink-Axel, Incomplete Fusion and All That
9 pages. Contribution to the International Workshop on Compound-Nuclear Reactions and Related Topics (CNR*2007), October 22-26, 2007, Fish Camp, California. To be published in AIP Proceedings (Editor Jutta Escher)
AIPConf.Proc.1005:129-134,2008
10.1063/1.2920715
null
nucl-th
null
We discuss the connection between absorption, averages and fluctuations in nuclear reactions. The fluctuations in the entrance channel result in the compound nucleus, Hauser-Feshbach, cross section, the fluctuations in the intermediate channels, result in modifications of multistep reaction cross sections, while the fluctuations in the final channel result in hybrid cross sections that can be used to describe incomplete fusion reactions. We discuss the latter in details and comment on the validity of the assumptions used in the develpoment of the Surrogate method. We also discuss the theory of multistep reactions with regards to intermediate state fluctuations and the energy dependence and non-locality of the intermediate channels optical potentials.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 10:34:03 GMT" }, { "version": "v2", "created": "Sun, 13 Jan 2008 19:15:19 GMT" } ]
2008-11-26T00:00:00
[ [ "Hussein", "M. S.", "" ] ]
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712.2923
Roumen Anguelov
Roumen Anguelov, Inger Plaskitt
A Class of LULU Operators on Multi-Dimensional Arrays
null
null
null
null
cs.CV
null
The LULU operators for sequences are extended to multi-dimensional arrays via the morphological concept of connection in a way which preserves their essential properties, e.g. they are separators and form a four element fully ordered semi-group. The power of the operators is demonstrated by deriving a total variation preserving discrete pulse decomposition of images.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 10:43:23 GMT" } ]
2007-12-19T00:00:00
[ [ "Anguelov", "Roumen", "" ], [ "Plaskitt", "Inger", "" ] ]
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712.2924
Yousef Ghazi-Tabatabai
Fay Dowker and Yousef Ghazi-Tabatabai
Dynamical Wave Function Collapse Models in Quantum Measure Theory
20 pages, 1 figure. Revised after refereeing
J.Phys.A41:205306,2008
10.1088/1751-8113/41/20/205306
null
quant-ph
null
The structure of Collapse Models is investigated in the framework of Quantum Measure Theory, a histories-based approach to quantum mechanics. The underlying structure of coupled classical and quantum systems is elucidated in this approach which puts both systems on a spacetime footing. The nature of the coupling is exposed: the classical histories have no dynamics of their own but are simply tied, more or less closely, to the quantum histories.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 10:48:15 GMT" }, { "version": "v2", "created": "Thu, 15 May 2008 10:18:22 GMT" } ]
2012-10-19T00:00:00
[ [ "Dowker", "Fay", "" ], [ "Ghazi-Tabatabai", "Yousef", "" ] ]
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712.2925
Raymond Nepstad
R. Nepstad, L. S{\ae}len and J. P. Hansen
Coherent adiabatic theory of two-electron quantum dot molecules in external spin baths
4 pages, 3 figures
null
10.1103/PhysRevB.77.125315
null
cond-mat.other
null
We derive an accurate molecular orbital based expression for the coherent time evolution of a two-electron wave function in a quantum dot molecule where the electrons interact with each other, with external time dependent electromagnetic fields and with a surrounding nuclear spin reservoir. The theory allows for direct numerical modeling of the decoherence in quantum dots due to hyperfine interactions. Calculations result in good agreement with recent singlet-triplet dephasing experiments by Laird et. al. [Phys. Rev. Lett. 97, 056801 (2006)], as well as analytical model calculations. Furthermore, it is shown that using a much faster electric switch than applied in these experiments will transfer the initial state to excited states where the hyperfine singlet-triplet mixing is negligible.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 10:53:24 GMT" } ]
2009-11-13T00:00:00
[ [ "Nepstad", "R.", "" ], [ "Sælen", "L.", "" ], [ "Hansen", "J. P.", "" ] ]
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712.2926
Chihiro Sasaki
K. Redlich (Univ. of Wroclaw and GSI), B. Friman (GSI), C. Sasaki (TU Munich)
Density fluctuations and chiral phase transition
8 pages, 4 figures, contribution to SQM 2007 in Levoca, Slovakia, J. Phys. G in press
J.Phys.G35:044013,2008
10.1088/0954-3899/35/4/044013
null
hep-ph nucl-th
null
Based on an effective QCD Lagrangian we discuss the properties of charge density fluctuations in the vicinity of chiral phase transition. We explore thermodynamics in the presence of spinodal phase separation. We show that appearance of spinodal decomposition in a non-equilibrium first order phase transition results in divergence of the charge density fluctuations related with the electric charge and baryon number conservation. Consequently, divergent fluctuations at the chiral phase transition are not only attributed to the critical end point but are also there along the first order phase transition if the spinodal phase separation take place. Based on the mean field dynamics, the critical exponents for these singular behavior of charge susceptibilities are also discussed.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 11:07:49 GMT" } ]
2008-11-26T00:00:00
[ [ "Redlich", "K.", "", "Univ. of Wroclaw and GSI" ], [ "Friman", "B.", "", "GSI" ], [ "Sasaki", "C.", "", "TU\n Munich" ] ]
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712.2927
Abhas Mitra
Abhas Mitra
Masses of radiation pressure supported stars in extreme relativistic realm
Proceedings of IAU Symposium #238, held 21-25 August, 2006 in Prague, Czech Republic
Black Holes from Stars to Galaxies-- Across the Range of Masses, Ed. V. Karas & G. Matt. Cam. Univ. Press, (2007), pp.409
10.1017/S1743921307005698
null
physics.gen-ph
null
We discuss that in the extreme relativistic limit, i.e., when z >>1, where z is the surface gravitational redshift, there could be radiation pressure supported and dominated stars with arbitrary gravitational mass, high or low. Such Objects are called Eternally Collapsing Objects (ECOs). ECOs are practically as compact as Schwarzschil Black Holes (BH) and, observationally, are likely to be mistaken as BHs. Further since any object undergoing continued collapse must first become an ECO before becoming a true BH state charcterized by M=0, the observed BH Candidates are ECOs.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 11:13:11 GMT" } ]
2009-11-13T00:00:00
[ [ "Mitra", "Abhas", "" ] ]
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712.2928
Danil Boukhvalov W
D.W. Boukhvalov and M. I. Katsnelson
Defect-induced ferromagnetism in fullerenes
11 pages, 7 figures, final version to be published in Eur. Phys. J B
The European Physical Journal B 68(4), 529-535 (2009)
10.1140/epjb/e2009-00119-2
null
cond-mat.mtrl-sci
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Based on the ab initio electronic structure calculations the picture of ferromagnetism in polimerized C60 is proposed which seems to explain the whole set of controversial experimental data. We have demonstrated that, in contrast with cubic fullerene, in rhombohedral C60 the segregation of iron atoms is energetically unprofitable which is a strong argument in favor of intrinsic character of carbon ferromagnetism which can be caused by vacancies with unpaired magnetic electrons. It is shown that: (i) energy formation of the vacancies in the rhombohedral phase of C60 is essentially smaller than in the cubic phase, (ii) there is a strong ferromagnetic exchange interactions between carbon cages containing the vacancies, and (iii) the fusion of the magnetic vacancies into nonmagnetic bivacancy is energetically profitable. The latter can explain a fragility of the ferromagnetism.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 11:17:46 GMT" }, { "version": "v2", "created": "Sun, 5 Apr 2009 20:03:49 GMT" } ]
2009-05-11T00:00:00
[ [ "Boukhvalov", "D. W.", "" ], [ "Katsnelson", "M. I.", "" ] ]
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712.2929
Marcus Warfheimer
Marcus Warfheimer
Attractive nearest-neighbor spin systems on the integers in a randomly evolving environment
14 pages
null
null
null
math.PR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider spin systems on $\Z$ (i.e.\ interacting particle systems on $\Z$ in which each coordinate only has two possible values and only one coordinate changes in each transition) whose rates are determined by another process, called a background process. A canonical example is the so called contact process in randomly evolving environment (CPREE), introduced and analysed by E. Broman and furthermore studied by J. Steif and the author, where the marginals of the background process independently evolve as 2-state Markov chains and determine the recovery rates for a contact process. We prove that under certain conditions on the rates there are at most two extremal stationary distributions. The proof follows closely the ideas of Liggett's proof of a corresponding theorem for spin systems on $\Z$ without a background process.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 11:38:12 GMT" }, { "version": "v2", "created": "Sat, 17 Apr 2010 08:09:00 GMT" } ]
2010-04-20T00:00:00
[ [ "Warfheimer", "Marcus", "" ] ]
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712.293
Sandor D. Katz
Z. Fodor
Recent Result in QCD Thermodynamics from the Lattice
15 pages, Critical Point and Onset of Deconfinement 4th International Workshop, July 9-13 2007, GSI Darmstadt,Germany
PoSCPOD07:027,2007
null
null
hep-lat
null
Recent results on QCD thermodynamics are presented. The nature of the T>0 transition is determined, which turns out to be an analytic cross-over. The absolute scale for this transition is calculated. The results were obtained by using a Symanzik improved gauge and stout-link improved fermionic action. In order to approach the continuum limit four different sets of lattice spacings were used with temporal extensions N_t=4, 6, 8 and 10 (they correspond to lattice spacings a \sim 0.3, 0.2, 0.15 and 0.12 fm). The equation of state is determined on N_t=4 and 6 lattices. The importance of the continuum limit for different results (critical endpoint, colour superconducting phase) at non-vanishing baryonic densities is discussed.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 11:27:21 GMT" } ]
2008-12-18T00:00:00
[ [ "Fodor", "Z.", "" ] ]
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712.2931
William Chaplin
W. J. Chaplin, Y. Elsworth, R. New, T. Toutain
Distortion of the p-mode peak profiles by the solar-cycle frequency shifts: do we need to worry?
7 pages; accepted for publication in MNRAS
null
10.1111/j.1365-2966.2007.12833.x
null
astro-ph
null
We seek to address whether solar-cycle frequency shifts of the Sun's low-l p modes `distort' the underlying shapes of the mode peaks, when those peaks are observed in power frequency spectra made from data spanning large fractions, or more, of the cycle period. We present analytical descriptions of the expected profiles, and validate the predictions through use of artificial seismic timeseries data, in which temporal variations of the oscillator frequencies are introduced. Our main finding is that for the Sun-like frequency shifts the distortion of the asymmetrical Lorentzian-like profiles is very small, but also just detectible. Our analysis indicates that by fitting modes to the usual Lorentzian-like models -- which do not allow for the distortion -- rather than new models we derive, there is a bias in the mode height and linewidth parameters that is comparable in size to the observational uncertainties given by multi-year datasets. Bias in the frequency parameter gives much less cause for worry, being over an order of magnitude smaller than the corresponding frequency uncertainties. The distortion discussed in this paper may need to be considered when multi-year Sun-like asteroseismic datasets are analyzed on stars showing strong activity cycles.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 11:33:32 GMT" } ]
2009-11-13T00:00:00
[ [ "Chaplin", "W. J.", "" ], [ "Elsworth", "Y.", "" ], [ "New", "R.", "" ], [ "Toutain", "T.", "" ] ]
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712.2932
Leo van Iersel
Leo van Iersel, Steven Kelk and Matthias Mnich
Uniqueness, intractability and exact algorithms: reflections on level-k phylogenetic networks
null
null
null
null
q-bio.PE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Phylogenetic networks provide a way to describe and visualize evolutionary histories that have undergone so-called reticulate evolutionary events such as recombination, hybridization or horizontal gene transfer. The level k of a network determines how non-treelike the evolution can be, with level-0 networks being trees. We study the problem of constructing level-k phylogenetic networks from triplets, i.e. phylogenetic trees for three leaves (taxa). We give, for each k, a level-k network that is uniquely defined by its triplets. We demonstrate the applicability of this result by using it to prove that (1) for all k of at least one it is NP-hard to construct a level-k network consistent with all input triplets, and (2) for all k it is NP-hard to construct a level-k network consistent with a maximum number of input triplets, even when the input is dense. As a response to this intractability we give an exact algorithm for constructing level-1 networks consistent with a maximum number of input triplets.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 11:59:51 GMT" }, { "version": "v2", "created": "Mon, 14 Jan 2008 09:24:17 GMT" }, { "version": "v3", "created": "Mon, 21 Jul 2008 10:53:23 GMT" } ]
2008-07-21T00:00:00
[ [ "van Iersel", "Leo", "" ], [ "Kelk", "Steven", "" ], [ "Mnich", "Matthias", "" ] ]
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712.2933
Peihong Gu
Pei-Hong Gu, Utpal Sarkar
Radiative Neutrino Mass, Dark Matter and Leptogenesis
4 pages, 3 figures. Revised version with improved model. Accepted by PRD
Phys.Rev.D77:105031,2008
10.1103/PhysRevD.77.105031
null
hep-ph
null
We propose an extension of the standard model, in which neutrinos are Dirac particles and their tiny masses originate from a one-loop radiative diagram. The new fields required by the neutrino mass-generation also accommodate the explanation for the matter-antimatter asymmetry and dark matter in the universe.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 11:35:17 GMT" }, { "version": "v2", "created": "Tue, 22 Apr 2008 13:20:30 GMT" } ]
2008-11-26T00:00:00
[ [ "Gu", "Pei-Hong", "" ], [ "Sarkar", "Utpal", "" ] ]
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712.2934
Julio Largo
J. Largo, M.A. Miller, F. Sciortino
The vanishing limit of the square-well fluid: the adhesive hard sphere model as a reference system
14 pages, 4 figures, 2 tables
null
10.1063/1.2883696
null
cond-mat.soft cond-mat.stat-mech
null
We report a simulation study of the gas-liquid critical point for the square-well potential, for values of well width delta as small as 0.005 times the particle diameter sigma. For small delta, the reduced second virial coefficient at the critical point B_2*c is found to depend linearly on delta. The observed weak linear dependence is not sufficient to produce any significant observable effect if the critical temperature T_c is estimated via a constant B_2*c assumption, due to the highly non linear transformation between B_2*c and T_c. This explains the previously observed validity of the law of corresponding states. The critical density rho_c is also found to be constant when measured in units of the cubed average distance between two bonded particles (1+0.5 delta)/sigma. The possibility of describing the delta -> 0 dependence with precise functional forms provides improved acccurate estimates of the critical parameters of the adhesive hard-sphere AHS model.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 11:36:22 GMT" } ]
2009-11-13T00:00:00
[ [ "Largo", "J.", "" ], [ "Miller", "M. A.", "" ], [ "Sciortino", "F.", "" ] ]
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712.2935
Matthew Grace
Matthew D. Grace, Constantin Brif, Herschel Rabitz, Daniel A. Lidar, Ian A. Walmsley, and Robert L. Kosut
Fidelity of optimally controlled quantum gates with randomly coupled multiparticle environments
tMOP LaTeX, 9 pages, 3 figures; Special issue of the Journal of Modern Optics: 37th Winter Colloquium on the Physics of Quantum Electronics, 2-6 January 2007
J. Mod. Optics, 54 (16-17), 2339 (2007)
10.1080/09500340701639615
null
quant-ph
null
This work studies the feasibility of optimal control of high-fidelity quantum gates in a model of interacting two-level particles. One particle (the qubit) serves as the quantum information processor, whose evolution is controlled by a time-dependent external field. The other particles are not directly controlled and serve as an effective environment, coupling to which is the source of decoherence. The control objective is to generate target one-qubit gates in the presence of strong environmentally-induced decoherence and under physically motivated restrictions on the control field. It is found that interactions among the environmental particles have a negligible effect on the gate fidelity and require no additional adjustment of the control field. Another interesting result is that optimally controlled quantum gates are remarkably robust to random variations in qubit-environment and inter-environment coupling strengths. These findings demonstrate the utility of optimal control for management of quantum-information systems in a very precise and specific manner, especially when the dynamics complexity is exacerbated by inherently uncertain environmental coupling.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 19:48:33 GMT" } ]
2009-12-23T00:00:00
[ [ "Grace", "Matthew D.", "" ], [ "Brif", "Constantin", "" ], [ "Rabitz", "Herschel", "" ], [ "Lidar", "Daniel A.", "" ], [ "Walmsley", "Ian A.", "" ], [ "Kosut", "Robert L.", "" ] ]
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712.2936
Alfredo Poves
F. Nowacki and A. Poves
A new effective interaction for $0\hbar\omega$ shell model calculations in the sdpf valence space
6 pages 4 figures, accepted in Phys. Rev. C
Phys.Rev.C79:014310,2009
10.1103/PhysRevC.79.014310
null
nucl-th nucl-ex
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The neutron rich isotopes with Z<20, in particular those with neutron numbers around N=28,have been at the focus of a lot experimental and theoretical scrutiny during the last few years.Shell model calculations using the effective interaction SDPF-NR, were able to predictor to explain most of the properties featured by these nuclei. Prominent among them is the disappearance of the N=28 shell closure for Z<=16. We have incorporated to SDPF-NR some modifications, either on purely theoretical grounds or guided by new experimental information. The proposed interaction, SDPF-U, contains USD as its sd-shell part and KB3G as its pf-shell-part. Its range of applicability is enlarged and its reliability enhanced with respect to the earlier version.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 11:38:50 GMT" }, { "version": "v2", "created": "Thu, 25 Sep 2008 14:40:24 GMT" }, { "version": "v3", "created": "Tue, 13 Jan 2009 16:19:35 GMT" } ]
2009-02-18T00:00:00
[ [ "Nowacki", "F.", "" ], [ "Poves", "A.", "" ] ]
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712.2937
Luis Ramon Bellot Rubio
L.R. Bellot Rubio, A. Tritschler, V. Martinez Pillet
Spectropolarimetry of a decaying sunspot penumbra
Accepted for publication in ApJ
null
10.1086/527366
null
astro-ph
null
We report on high angular resolution, high precision spectropolarimetric measurements of a decaying sunspot. The spot gradually lost its penumbra during the course of three days. In the late stages of evolution where the only remnant of the spot is a naked umbra, we find small-scale inhomogeneities in the magnetic canopy surrounding it. The inhomogeneities are observed as finger-like structures of weak and nearly horizontal magnetic fields extending 1-2 arcsec from the outer border of the umbra. These fields are not associated with filamentary structures in continuum intensity, nor with conspicuous Evershed flows. The Stokes profiles emerging from the fingers exhibit blueshifts which we interpret as upward motions. This previously unknown fine structure may be related to penumbral field lines that no longer carry strong Evershed flows and rise to the chromosphere, producing the disappearance of the penumbra at photospheric levels.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 11:56:39 GMT" } ]
2009-11-13T00:00:00
[ [ "Rubio", "L. R. Bellot", "" ], [ "Tritschler", "A.", "" ], [ "Pillet", "V. Martinez", "" ] ]
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712.2938
Naoki Yamatsu
Kenzo Inoue, Naoki Yamatsu (Kyushu U.)
Charged lepton and down-type quark masses in SU(1,1) model and the structure of higgs sector
25 pages, no figures
Prog.Theor.Phys.119:775-796, 2008
10.1143/PTP.119.775
KYUSHU-HET-109
hep-ph
null
The simplest noncompact group SU(1,1),when introduced as a symmetry group of the generations of quarks and leptons in the framework of a vector-like theory, gives an excellent viewpoint on low energy physics. The minimal setup of the scheme, however, gives phenomenologically unacceptable prediction on the Yukawa coupling matrices. This suggests the higgs sector has richer structure than we expect from the success of MSSM. The natural extension of the scheme, which has doubled structure in the higgs sector, is formulated. The framework admits this extension in a restrictive way. The possible patterns of Yukawa couplings are classified and the expressions of the coupling matrices are presented.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 11:58:45 GMT" }, { "version": "v2", "created": "Tue, 4 Mar 2008 08:53:43 GMT" } ]
2009-12-15T00:00:00
[ [ "Inoue", "Kenzo", "", "Kyushu U." ], [ "Yamatsu", "Naoki", "", "Kyushu U." ] ]
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712.2939
Chien-Lung Huang
C. L. Huang, J.-Y. Lin, Y. T. Chang, C. P. Sun, H. Y. Shen, C. C. Chou, H. Berger, T. K. Lee, and H. D. Yang
Experimental evidence for a two-gap structure of superconducting NbSe_2: a specific heat study in external magnetic fields
16 pages, 4 figures
Physical Review B 76, 212504 (2007)
10.1103/PhysRevB.76.212504
null
cond-mat.supr-con
null
To resolve the discrepancies of the superconducting order parameter in quasi-two-dimensional NbSe_2, comprehensive specific-heat measurements have been carried out. By analyzing both the zero-field and mixed-state data with magnetic fields perpendicular to and parallel to the c axis of the crystal and using the two-gap model, we conclude that (1) more than one energy scale of the order parameter is required for superconducting NbSe_2 due to the thermodynamic consistency; (2)delta_L=1.26 meV and delta_S=0.73 meV are obtained; (3) N_S(0)/N(0)=11%~20%; (4) The observation of the kink in gamma(H) curve suggests that the two-gap scenario is more favorable than the anisotropic s-wave model to describe the gap structure of NbSe_2; and (5)delta_S is more isotropic and has a three-dimensional-like feature and is located either on the Se or the bonding Nb Fermi sheets.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 12:18:32 GMT" } ]
2009-11-13T00:00:00
[ [ "Huang", "C. L.", "" ], [ "Lin", "J. -Y.", "" ], [ "Chang", "Y. T.", "" ], [ "Sun", "C. P.", "" ], [ "Shen", "H. Y.", "" ], [ "Chou", "C. C.", "" ], [ "Berger", "H.", "" ], [ "Lee", "T. K.", "" ], [ "Yang", "H. D.", "" ] ]
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712.294
Ivan Nourdin
Ivan Nourdin (PMA), Giovanni Peccati (LSTA)
Stein's method on Wiener chaos
39 pages; Two sections added; To appear in PTRF
null
null
null
math.PR
null
We combine Malliavin calculus with Stein's method, in order to derive explicit bounds in the Gaussian and Gamma approximations of random variables in a fixed Wiener chaos of a general Gaussian process. We also prove results concerning random variables admitting a possibly infinite Wiener chaotic decomposition. Our approach generalizes, refines and unifies the central and non-central limit theorems for multiple Wiener-It\^o integrals recently proved (in several papers, from 2005 to 2007) by Nourdin, Nualart, Ortiz-Latorre, Peccati and Tudor. We apply our techniques to prove Berry-Ess\'een bounds in the Breuer-Major CLT for subordinated functionals of fractional Brownian motion. By using the well-known Mehler's formula for Ornstein-Uhlenbeck semigroups, we also recover a technical result recently proved by Chatterjee, concerning the Gaussian approximation of functionals of finite-dimensional Gaussian vectors.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 12:20:35 GMT" }, { "version": "v2", "created": "Thu, 27 Dec 2007 15:32:39 GMT" }, { "version": "v3", "created": "Fri, 25 Jan 2008 10:49:24 GMT" }, { "version": "v4", "created": "Sun, 3 Feb 2008 18:50:33 GMT" }, { "version": "v5", "created": "Sat, 10 May 2008 12:28:46 GMT" } ]
2008-05-10T00:00:00
[ [ "Nourdin", "Ivan", "", "PMA" ], [ "Peccati", "Giovanni", "", "LSTA" ] ]
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712.2941
Ivan Zivic
Ivan Zivic, Suncica Elezovic-Hadzic and Sava Milosevic
Critical behavior of interacting two-polymer system in a fractal solvent: an exact renormalization group approach
21 pages, 6 figures
Journal of Statistical Mechanics: Theory and Experiment (2008) P04022
10.1088/1742-5468/2008/04/P04022
null
cond-mat.stat-mech
null
We study the polymer system consisting of two polymer chains situated in a fractal container that belongs to the three--dimensional Sierpinski Gasket (3D SG) family of fractals. Each 3D SG fractal has four fractal impenetrable 2D surfaces, which are, in fact, 2D SG fractals. The two-polymer system is modelled by two interacting self-avoiding walks (SAWs), one of them representing a 3D floating polymer, while the other corresponds to a chain adhered to one of the four 2D SG boundaries. We assume that the studied system is immersed in a poor solvent inducing the intra-chain interactions. For the inter-chain interactions we propose two models: in the first model (ASAWs) the SAW chains are mutually avoiding, whereas in the second model (CSAWs) chains can cross each other. By applying an exact Renormalization Group (RG) method, we establish the relevant phase diagrams for $b=2,3$ and $b=4$ members of the 3D SG fractal family for the model with avoiding SAWs, and for $b=2$ and $b=3$ fractals for the model with crossing SAWs. Also, at the appropriate transition fixed points we calculate the contact critical exponents, associated with the number of contacts between monomers of different chains. Throughout the paper we compare results obtained for the two models and discuss the impact of the topology of the underlying lattices on emerging phase diagrams.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 12:20:51 GMT" } ]
2008-04-18T00:00:00
[ [ "Zivic", "Ivan", "" ], [ "Elezovic-Hadzic", "Suncica", "" ], [ "Milosevic", "Sava", "" ] ]
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712.2942
Taekyun Kim
Min-Soo Kim, Taekyun Kim, Jin-Woo Son
On A two-variable p-adic l_q function
11S80
null
10.1155/2008/360517
null
math.NT
null
We prove that a two-variable p-adic l_q-function has the series p-adic expansion which interpolates a linear combinations of terms of the generalized q-Euler polynomials at non positive integers. The proof of this original construction is due to Kubota and Leopoldt in 1964, although the method given this note is due to Washington
[ { "version": "v1", "created": "Tue, 18 Dec 2007 12:20:52 GMT" } ]
2015-05-13T00:00:00
[ [ "Kim", "Min-Soo", "" ], [ "Kim", "Taekyun", "" ], [ "Son", "Jin-Woo", "" ] ]
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712.2943
Bob Diertens
Bob Diertens
Software (Re-)Engineering with PSF
null
null
null
PRG0505
cs.SE
null
This paper investigates the usefulness of PSF in software engineering and reengineering. PSF is based on ACP (Algebra of Communicating Processes) and as some architectural description languages are based on process algebra, we investigate whether PSF can be used at the software architecture level, but we also use PSF at lower abstract levels. As a case study we reengineer the compiler from the Toolkit of PSF.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 12:25:02 GMT" } ]
2007-12-19T00:00:00
[ [ "Diertens", "Bob", "" ] ]
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712.2944
Mariluz Mart\'in Manj\'on
M. Mart\'in Manj\'on, M. Moll\'a, A. I. D\'iaz, R. Terlevich
The evolution of H{\sc ii} galaxies: Testing the bursting scenario through the use of self-consistent models
13 figures and 2 tables, accepted for publication in MNRAS Main Journal
null
10.1111/j.1365-2966.2008.12875.x
null
astro-ph
null
We have computed a series of realistic and self-consistent models of the emitted spectra of H{\sc ii} galaxies. Our models combine different codes of chemical evolution, evolutionary population synthesis and photoionization. The emitted spectrum of H{\sc ii} galaxies is reproduced by means of the photoionization code CLOUDY, using as ionizing spectrum the spectral energy distribution of the modelled H{\sc ii} galaxy, which in turn is calculated according to a Star Formation History (SFH) and a metallicity evolution given by a chemical evolution model that follows the abundances of 15 different elements. The contribution of emission lines to the broad-band colours is explicitly taken into account. The results of our code are compared with photometric and spectroscopic data of H{\sc ii} galaxies. Our technique reproduces observed diagnostic diagrams, abundances, equivalent width-colour and equivalent width-metallicity relations for local H{\sc ii} galaxies.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 12:32:08 GMT" } ]
2009-11-13T00:00:00
[ [ "Manjón", "M. Martín", "" ], [ "Mollá", "M.", "" ], [ "Díaz", "A. I.", "" ], [ "Terlevich", "R.", "" ] ]
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712.2945
Shi-Jie Yang
Shi-Jie Yang, Quan-Sheng Wu, Sheng-Nan Zhang, and Shiping Feng
Giant vortex and Skyrmion in a rotating two-species Bose-Einstein condensate
5 pages, 5 figures
Phys. Rev. A 77, 033621(2008)
10.1103/PhysRevA.77.033621
null
cond-mat.other
null
Numerical simulations are performed for a rotating two-species Bose condensate confined by a harmonic potential. The particle numbers of each species are unequal. When the rotational speed exceeds a critical value, the majority species reside in the center of the potential while the minority species is pushed out to the outskirts, forming a giant vortex hole to contain the majority species. A novel annular Skyrmion forms at the interface of the two species.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 12:33:05 GMT" } ]
2009-11-13T00:00:00
[ [ "Yang", "Shi-Jie", "" ], [ "Wu", "Quan-Sheng", "" ], [ "Zhang", "Sheng-Nan", "" ], [ "Feng", "Shiping", "" ] ]
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712.2946
Thierry Coulbois
Thierry Coulbois (LATP), Arnaud Hilion (LATP), Martin Lustig (LATP)
$\R$-trees, dual laminations, and compact systems of partial isometries
minor update
Math. Proc. of the Cambridge Phil. Soc. 147, 2 (2009) 345-368
10.1017/S0305004109002436
null
math.GR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Let $\FN$ be a free group of finite rank $N \geq 2$, and let $T$ be an $\R$-tree with a very small, minimal action of $\FN$ with dense orbits. For any basis $\CA$ of $\FN$ there exists a {\em heart} $K_{\CA} \subset \bar T$ (= the metric completion of $T$) which is a compact subtree that has the property that the dynamical system of partial isometries $a_{i} : K_{\CA} \cap a_{i} K_{\CA} \to a_{i}\inv K_{\CA} \cap K_{\CA}$, for each $a_{i} \in \CA$, defines a tree $T_{(K_{\CA}, \CA)}$ which contains an isometric copy of $T$ as minimal subtree.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 12:37:42 GMT" }, { "version": "v2", "created": "Wed, 22 Oct 2008 08:22:47 GMT" }, { "version": "v3", "created": "Wed, 1 Apr 2009 16:33:59 GMT" } ]
2015-05-13T00:00:00
[ [ "Coulbois", "Thierry", "", "LATP" ], [ "Hilion", "Arnaud", "", "LATP" ], [ "Lustig", "Martin", "", "LATP" ] ]
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712.2947
Wolfgang Lucha
Z.-F. Li, Wolfgang Lucha, F. Schoberl
Stability in the instantaneous Bethe-Salpeter formalism: reduced exact-propagator bound-state equation with harmonic interaction
13 pages
J.Phys.G35:115002,2008
10.1088/0954-3899/35/11/115002
HEPHY-PUB 855/07
hep-ph nucl-th
null
Several numerical investigations of the Salpeter equation with static confining interactions of Lorentz-scalar type revealed that its solutions are plagued by instabilities of presumably Klein-paradox nature. By proving rigorously that the energies of all predicted bound states are part of real, entirely discrete spectra bounded from below, these instabilities are shown, for confining interactions of harmonic-oscillator shape, to be absent for a reduced version of an instantaneous Bethe-Salpeter formalism designed to generalize the Salpeter equation towards an approximate inclusion of the exact propagators of all bound-state constituents.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 12:55:57 GMT" } ]
2008-11-26T00:00:00
[ [ "Li", "Z. -F.", "" ], [ "Lucha", "Wolfgang", "" ], [ "Schoberl", "F.", "" ] ]
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712.2948
Stefan Nemirovski
Stefan Nemirovski
Finite unions of balls in C^n are rationally convex
V.2 - minor edits, 2 pages
Russian Math. Surveys 63:2 (2008), 381-382.
10.1070/RM2008v063n02ABEH004518
null
math.CV
null
It is shown that the rational convexity of any finite union of disjoint closed balls in C^n follows easily from the results of Duval and Sibony.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 12:55:01 GMT" }, { "version": "v2", "created": "Sun, 30 Dec 2007 11:24:58 GMT" } ]
2008-08-18T00:00:00
[ [ "Nemirovski", "Stefan", "" ] ]
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712.2949
Jonay I. Gonzalez Hernandez
J. I. Gonz\'alez Hern\'andez, P. Bonifacio, H.-G. Ludwig, E. Caffau, M. Spite, F. Spite, R. Cayrel, P. Molaro, V. Hill, P. Fran\c{c}ois, B. Plez, T. C. Beers, T. Sivarani, J. Andersen, B. Barbuy, E. Depagne, B. Nordstr\"om and F. Primas
First Stars XI. Chemical composition of the extremely metal-poor dwarfs in the binary CS 22876--032
Accepted for publication in Astronomy & Astrophysics
null
10.1051/0004-6361:20078847
null
astro-ph
null
We have used high-resolution, high-S/N ratio spectra from the UVES spectrograph at the ESO VLT telescope. Long-term radial-velocity measurements and broad-band photometry allow us to determine improved orbital elements and stellar parameters for both components. We use OSMARCS 1D models and the {{\scshape turbospectrum}} spectral synthesis code to determine the abundances of Li, O, Na, Mg, Al, Si, Ca, Sc, Ti, Cr, Mn, Fe, Co and Ni. We also use the CO$^5$BOLD model atmosphere code to compute the 3D abundance corrections, especially for Li and O. We find a metallicity of [Fe/H]$\sim -3.6$ for both stars, using 1D models with 3D corrections of $\sim -0.1$ dex from averaged 3D models. We determine the oxygen abundance from the near-UV OH bands; the 3D corrections are large, -1 and -1.5 dex for the secondary and primary respectively, and yield [O/Fe] $\sim 0.8$, close to the high-quality results obtained from the [OI] 630 nm line in metal-poor giants. Other [$\alpha$/Fe] ratios are consistent with those measured in other dwarfs and giants with similar [Fe/H], although Ca and Si are somewhat low ([X/Fe]$\la 0$). Other element ratios follow those of other halo stars. The Li abundance of the primary star is consistent with the Spite plateau, but the secondary shows a lower abundance; 3D corrections are small. The Li abundance in the primary star supports the extension of the {{\em Spite Plateau}} value at the lowest metallicities, without any decrease. The low abundance in the secondary star could be explained by endogenic Li depletion, due to its cooler temperature. If this is not the case, another, yet unknown mechanism may be causing increased scatter in A(Li) at the lowest metallicities.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 13:05:47 GMT" } ]
2009-11-13T00:00:00
[ [ "Hernández", "J. I. González", "" ], [ "Bonifacio", "P.", "" ], [ "Ludwig", "H. -G.", "" ], [ "Caffau", "E.", "" ], [ "Spite", "M.", "" ], [ "Spite", "F.", "" ], [ "Cayrel", "R.", "" ], [ "Molaro", "P.", "" ], [ "Hill", "V.", "" ], [ "François", "P.", "" ], [ "Plez", "B.", "" ], [ "Beers", "T. C.", "" ], [ "Sivarani", "T.", "" ], [ "Andersen", "J.", "" ], [ "Barbuy", "B.", "" ], [ "Depagne", "E.", "" ], [ "Nordström", "B.", "" ], [ "Primas", "F.", "" ] ]
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712.295
Ira Schwartz
Eric Forgoston and Ira B. Schwartz
Delay Induced Instabilities in Self-Propelling Swarms
4 pages, 5 figures Final revision to appear in PRE Rapid Communications
null
10.1103/PhysRevE.77.035203
null
nlin.AO nlin.PS
null
We consider a general model of self-propelling particles interacting through a pairwise attractive force in the presence of noise and communication time delay. Previous work by Erdmann, et al. [Phys. Rev. E {\bf 71}, 051904 (2205)] has shown that a large enough noise intensity will cause a translating swarm of individuals to transition to a rotating swarm with a stationary center of mass. We show that with the addition of a time delay, the model possesses a transition that depends on the size of the coupling amplitude. This transition is independent of the initial swarm state (traveling or rotating) and is characterized by the alignment of all of the individuals along with a swarm oscillation. By considering the mean field equations without noise, we show that the time delay induced transition is associated with a Hopf bifurcation. The analytical result yields good agreement with numerical computations of the value of the coupling parameter at the Hopf point.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 13:06:41 GMT" }, { "version": "v2", "created": "Mon, 25 Feb 2008 18:43:10 GMT" } ]
2009-11-13T00:00:00
[ [ "Forgoston", "Eric", "" ], [ "Schwartz", "Ira B.", "" ] ]
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712.2951
Wenhua Hai
Wenhua Hai, Shiguang Rong, Qianquan Zhu
Discrete chaotic states of a Bose-Einstein condensate
7 pages, 5 figures
Phys. Rev. E 78, 066214 (2008)
10.1103/PhysRevE.78.066214
null
cond-mat.other
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We find the different spatial chaos in a one-dimensional attractive Bose-Einstein condensate interacting with a Gaussian-like laser barrier and perturbed by a weak optical lattice. For the low laser barrier the chaotic regions of parameters are demonstrated and the chaotic and regular states are illustrated numerically. In the high barrier case, the bounded perturbed solutions which describe a set of discrete chaotic states are constructed for the discrete barrier heights and magic numbers of condensed atoms. The chaotic density profiles are exhibited numerically for the lowest quantum number, and the analytically bounded but numerically unbounded Gaussian-like configurations are confirmed. It is shown that the chaotic wave packets can be controlled experimentally by adjusting the laser barrier potential.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 13:06:44 GMT" }, { "version": "v2", "created": "Thu, 22 Jan 2009 06:14:32 GMT" } ]
2009-11-13T00:00:00
[ [ "Hai", "Wenhua", "" ], [ "Rong", "Shiguang", "" ], [ "Zhu", "Qianquan", "" ] ]
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712.2952
Zoltan Esik
S. L. Bloom, Z. Esik, W. Kuich
Partial Conway and iteration semirings
null
null
null
null
cs.DM cs.LO
null
A Conway semiring is a semiring $S$ equipped with a unary operation $^*:S \to S$, always called 'star', satisfying the sum star and product star identities. It is known that these identities imply a Kleene type theorem. Some computationally important semirings, such as $N$ or $N^{\rat}\llangle \Sigma^* \rrangle$ of rational power series of words on $\Sigma$ with coefficients in $N$, cannot have a total star operation satisfying the Conway identities. We introduce here partial Conway semirings, which are semirings $S$ which have a star operation defined only on an ideal of $S$; when the arguments are appropriate, the operation satisfies the above identities. We develop the general theory of partial Conway semirings and prove a Kleene theorem for this generalization.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 13:14:38 GMT" } ]
2015-03-13T00:00:00
[ [ "Bloom", "S. L.", "" ], [ "Esik", "Z.", "" ], [ "Kuich", "W.", "" ] ]
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712.2953
Feng-Kun Guo
Feng-Kun Guo, Siegfried Krewald, Ulf-G. Meissner
Hadronic-loop induced mass shifts in scalar heavy-light mesons
14 pages, 2 figures. Version accepted for publication in Phys. Lett. B
Phys.Lett.B665:157-163,2008
10.1016/j.physletb.2008.06.008
null
hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We calculate the mass shifts of heavy-light scalar mesons due to hadronic loops under the assumption that these vanish for the groundstate heavy-light mesons. The results show that the masses calculated in quark models can be reduced significantly. We stress that the mass alone is not a signal for a molecular interpretation. Both the resulting mass and the width suggest the observed $D_0^*$ state could be a dressed $c\bar q$ state. We give further predictions for the bottom scalar mesons which can be used to test the dressing mechanism.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 13:41:42 GMT" }, { "version": "v2", "created": "Thu, 5 Jun 2008 12:15:43 GMT" } ]
2008-11-26T00:00:00
[ [ "Guo", "Feng-Kun", "" ], [ "Krewald", "Siegfried", "" ], [ "Meissner", "Ulf-G.", "" ] ]
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712.2954
Rumin Wang
C. S. Kim, Ru-Min Wang
Study of the exclusive $b \to u \ell^- \bar{\nu}_{\ell}$ decays in the MSSM with and without R-parity violation
28 pages and 10 figures
Phys.Rev.D77:094006,2008
10.1103/PhysRevD.77.094006
null
hep-ph
null
We study the exclusive $b \to u \ell^- \bar{\nu}_{\ell} (\ell=\tau,\mu,e)$ decays in the MSSM with and without R-parity violation. From the experimental measurements of branching ratios $\mathcal{B}(B^-_u \to \tau^- \bar{\nu}_{\tau})$, $\mathcal{B}(B^-_u \to M'^0 \ell'^- \bar{\nu}_{\ell'})$ and $\mathcal{B}(\bar{B}^0_d \to M'^+ \ell'^- \bar{\nu}_{\ell'})$ $(\ell'=\mu,e, M'=\pi,\rho)$, we derive new upper bounds on the relevant new physics parameters within the decays. Using the constrained new physics parameter spaces, we predict the charged Higgs effects and the R-parity violating effects on the branching ratios, the normalized forward-backward asymmetries of charged leptons, and the ratios of longitudinal to transverse polarization of the vector mesons, which have not been measured or have not been well measured yet. We find that the charged Higgs effects and the R-parity violating effects could be large and measurable in some cases. Our results could be used to probe new physics effects in the leptonic decays as well as the semileptonic decays, and will correlate with searches for direct supersymmetric signals in future experiments.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 13:19:55 GMT" } ]
2008-11-26T00:00:00
[ [ "Kim", "C. S.", "" ], [ "Wang", "Ru-Min", "" ] ]
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712.2955
Lilia Boeri
L. Boeri, J. S. Kim, M. Giantomassi, F. S. Razavi, S. Kuroiwa, J. Akimitsu, R. K. Kremer
Pressure effects on the superconducting transition in nH-CaAlSi
6 pages, 5 figures
null
10.1103/PhysRevB.77.144502
null
cond-mat.supr-con cond-mat.mtrl-sci
null
We present a combined experimental and theoretical study of the effects of pressure on T_c of the hexagonal layered superconductors nH-CaAlSi (n = 1, 5, 6), where nH labels the different stacking variants that were recently discovered. Experimentally, the pressure dependence of T_c has been investigated by measuring the magnetic susceptibility of single crystals up to 10 kbar. In contrast to previous results on polycrystalline samples, single crystals with different stacking sequences display different pressure dependences of T_c. 1H-CaAlSi shows a decrease of T_c with pressure, whereas 5H and 6H-CaAlSi exhibit an increase of T_c with pressure. Ab-initio calculations for 1H, 5H and 6H -CaAlSi reveal that an ultrasoft phonon branch associated to out-of-plane vibrations of the Al-Si layers softens with pressure, leading to a structural instability at high pressures. For 1H-CaAlSi the softening is not sufficient to cause an increase of T_c, which is consistent with the present experiments, but adverse to previous reports. For 5H and 6H the softening provides the mechanism to understand the observed increase of T_c with pressure. Calculations for hypothetical 2H and 3H stacking variants reveal qualitative and quantitative differences.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 13:22:09 GMT" } ]
2009-11-13T00:00:00
[ [ "Boeri", "L.", "" ], [ "Kim", "J. S.", "" ], [ "Giantomassi", "M.", "" ], [ "Razavi", "F. S.", "" ], [ "Kuroiwa", "S.", "" ], [ "Akimitsu", "J.", "" ], [ "Kremer", "R. K.", "" ] ]
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712.2956
Thomas Salzburger
Thomas Salzburger, Helmut Ritsch
Twin stimulated amplification of light and matter waves in an atom-photon pair laser
null
null
10.1103/PhysRevA.77.063620
null
quant-ph
null
We consider ultracold atoms in a far detuned optical lattice orientated across a high-Q optical resonator. Applying an external driving laser to the atoms, which is red detuned from the cavity mode by one vibrational quantum, induces cavity-enhanced sideband cooling. For a dense and cold enough atomic ensemble we predict an oscillation threshold for optical Raman sideband lasing concurrent with coherent matter-wave amplification. Above this oscillation threshold photons and atoms in the lowest band are dominantly created pairwise via stimulated emission with a strong suppression of competing spontaneous processes. In close analogy to a nondegenerate parametric oscillator we find sub-Poissonian photon statistics and almost perfect nonclassical atom-photon number correlations. Injecting atoms in higher vibrational bands via tunneling or incoherent scattering then leads to continuous, simultaneous generation of a coherent atom beam and laser light with nonclassical atom-field correlations.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 13:26:00 GMT" } ]
2009-11-13T00:00:00
[ [ "Salzburger", "Thomas", "" ], [ "Ritsch", "Helmut", "" ] ]
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712.2957
Decio Levi
G. Dattoli, D. Levi, P. Winternitz
Heisenberg Algebra, Umbral Calculus and Orthogonal Polynomials
19 pages, 5 figures
null
10.1063/1.2909731
null
math-ph math.MP
null
Umbral calculus can be viewed as an abstract theory of the Heisenberg commutation relation $[\hat P,\hat M]=1$. In ordinary quantum mechanics $\hat P$ is the derivative and $\hat M$ the coordinate operator. Here we shall realize $\hat P$ as a second order differential operator and $\hat M$ as a first order integral one. We show that this makes it possible to solve large classes of differential and integro-differential equations and to introduce new classes of orthogonal polynomials, related to Laguerre polynomials. These polynomials are particularly well suited for describing so called flatenned beams in laser theory
[ { "version": "v1", "created": "Tue, 18 Dec 2007 13:28:43 GMT" } ]
2009-11-13T00:00:00
[ [ "Dattoli", "G.", "" ], [ "Levi", "D.", "" ], [ "Winternitz", "P.", "" ] ]
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712.2958
Joel Goossens
Vincent N\'elis, Jo\"el Goossens, Nicolas Navet, Raymond Devillers and Dragomir Milojevic
Power-Aware Real-Time Scheduling upon Identical Multiprocessor Platforms
The manuscript corresponds to the final version of SUTC 2008 conference
null
null
null
cs.OS
null
In this paper, we address the power-aware scheduling of sporadic constrained-deadline hard real-time tasks using dynamic voltage scaling upon multiprocessor platforms. We propose two distinct algorithms. Our first algorithm is an off-line speed determination mechanism which provides an identical speed for each processor. That speed guarantees that all deadlines are met if the jobs are scheduled using EDF. The second algorithm is an on-line and adaptive speed adjustment mechanism which reduces the energy consumption while the system is running.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 13:42:45 GMT" }, { "version": "v2", "created": "Mon, 10 Mar 2008 16:10:50 GMT" } ]
2008-03-10T00:00:00
[ [ "Nélis", "Vincent", "" ], [ "Goossens", "Joël", "" ], [ "Navet", "Nicolas", "" ], [ "Devillers", "Raymond", "" ], [ "Milojevic", "Dragomir", "" ] ]
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712.2959
Te Sun Han
Te Sun Han
Joint Source-Channel Coding Revisited: Information-Spectrum Approach
null
null
null
null
cs.IT math.IT
null
Given a general source with countably infinite source alphabet and a general channel with arbitrary abstract channel input/channel output alphabets, we study the joint source-channel coding problem from the information-spectrum point of view. First, we generalize Feinstein's lemma (direct part) and Verdu-Han's lemma (converse part) so as to be applicable to the general joint source-channel coding problem. Based on these lemmas, we establish a sufficient condition as well as a necessary condition for the source to be reliably transmissible over the channel with asymptotically vanishing probability of error. It is shown that our sufficient condition is equivalent to the sufficient condition derived by Vembu, Verdu and Steinberg, whereas our necessary condition is shown to be stronger than or equivalent to the necessary condition derived by them. It turns out, as a direct consequence, that separation principle in a relevantly generalized sense holds for a wide class of sources and channels, as was shown in a quite dfifferent manner by Vembu, Verdu and Steinberg. It should also be remarked that a nice duality is found between our necessary and sufficient conditions, whereas we cannot fully enjoy such a duality between the necessary condition and the sufficient condition by Vembu, Verdu and Steinberg. In addition, we demonstrate a sufficient condition as well as a necessary condition for the epsilon-transmissibility. Finally, the separation theorem of the traditional standard form is shown to hold for the class of sources and channels that satisfy the semi-strong converse property.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 13:33:58 GMT" } ]
2007-12-19T00:00:00
[ [ "Han", "Te Sun", "" ] ]
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712.296
Cristiano De Michele
Cristiano De Michele, Rolf Schilling, Francesco Sciortino
Event-Driven Simulation of the Dynamics of Hard Ellipsoids
Proceedings of IWCS2007 Sendai (Japan)
null
10.1063/1.2897771
null
cond-mat.soft cond-mat.mtrl-sci
null
We introduce a novel algorithm to perform event-driven simulations of hard rigid bodies of arbitrary shape, that relies on the evaluation of the geometric distance. In the case of a monodisperse system of uniaxial hard ellipsoids,we perform molecular dynamics simulations varying the aspect-ratio X0 and the packing fraction phi. We evaluate the translational Dtrans and the rotational Drot diffusion coefficient and the associated isodiffusivity lines in the phi-X0 plane. We observe a decoupling of the translational and rotational dynamics which generates an almost perpendicular crossing of the Dtrans and Drot isodiffusivity lines. While the self intermediate scattering function exhibits stretched relaxation, i.e. glassy dynamics, only for large phi and X0 about equals to 1, the second order orientational correlator C2(t) shows stretching only for large and small X0 values. We discuss these findings in the context of a possible pre-nematic order driven glass transition.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 13:45:10 GMT" } ]
2009-11-13T00:00:00
[ [ "De Michele", "Cristiano", "" ], [ "Schilling", "Rolf", "" ], [ "Sciortino", "Francesco", "" ] ]
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712.2961
Marina Burlak
Marina Burlak
The frequency distribution of the height above the Galactic plane for the novae
11 pages, 2 figures, 1 table
null
null
null
astro-ph
null
In order to examine the hypothesis of the existence of two different kinds of nova populations in the Galaxy - 'disk' novae and 'bulge' novae - the frequency distribution in the z-direction was obtained for 64 novae. The fact that large number of fast novae related to disk novae are found at a significant distance from the Galactic plane (up to z~3700 pc) can't result from photometric measurements errors. Slow novae considered to belong to bulge novae show more close concentration to the Galactic plane (z<1700 pc). A Kolmogorov-Smirnov test run on the data showed that the two populations hypothesis probability amounts to 95.56%.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 14:35:07 GMT" } ]
2007-12-19T00:00:00
[ [ "Burlak", "Marina", "" ] ]
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712.2962
Maria Julia Redondo
Ibrahim Assem, Maria Julia Redondo
The first Hochschild cohomology group of a schurian cluster-tilted algebra
17 pages
Manuscripta Math. 128 (2009), no. 3, 373-388
null
null
math.RA math.RT
null
Given a cluster-tilted algebra B we study its first Hochschild cohomology group HH^1(B) with coefficients in the B-B-bimodule B. We find several consequences when B is representation-finite, and also in the case where B is cluster-tilted of type \tilde{\mathbb{A}}.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 13:51:56 GMT" } ]
2010-11-01T00:00:00
[ [ "Assem", "Ibrahim", "" ], [ "Redondo", "Maria Julia", "" ] ]
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712.2963
Mehdi Saeedi
Mehdi Saeedi, Morteza Saheb Zamani, Mehdi Sedighi
Algebraic Characterization of CNOT-Based Quantum Circuits with its Applications on Logic Synthesis
8 pages, 13 figures, 10Th EUROMICRO Conference on Digital System Design, Architectures, Methods and Tools, Germany, 2007
null
10.1109/DSD.2007.4341490
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The exponential speed up of quantum algorithms and the fundamental limits of current CMOS process for future design technology have directed attentions toward quantum circuits. In this paper, the matrix specification of a broad category of quantum circuits, i.e. CNOT-based circuits, are investigated. We prove that the matrix elements of CNOT-based circuits can only be zeros or ones. In addition, the columns or rows of such a matrix have exactly one element with the value of 1. Furthermore, we show that these specifications can be used to synthesize CNOT-based quantum circuits. In other words, a new scheme is introduced to convert the matrix representation into its SOP equivalent using a novel quantum-based Karnaugh map extension. We then apply a search-based method to transform the obtained SOP into a CNOT-based circuit. Experimental results prove the correctness of the proposed concept.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 14:00:19 GMT" }, { "version": "v2", "created": "Fri, 9 Apr 2010 08:47:21 GMT" } ]
2010-04-12T00:00:00
[ [ "Saeedi", "Mehdi", "" ], [ "Zamani", "Morteza Saheb", "" ], [ "Sedighi", "Mehdi", "" ] ]
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712.2964
Hendrik Bartko
H. Bartko, W. Bednarek
Gamma-Ray Emission from PWNe Interacting with Molecular Clouds
accepted for publication in MNRAS
null
10.1111/j.1365-2966.2008.12870.x
MPP-2007-192
astro-ph
null
We consider a situation in which a pulsar is formed inside or close to a high density region of a molecular cloud. Right after birth, the pulsar was very active and accelerated hadrons and leptons to very high energies. Hadrons diffuse through the supernova remnant (SNR) and some of them are trapped in the nearby cloud interacting with the matter. We extend a recent time-dependent model for the gamma-radiation of pulsar wind nebulae (PWNe) to describe this more complicated astrophysical scenario. The example calculations have been performed for two objects, IC443 and W41, which have recently been discovered as sources of TeV gamma-rays. In this model the low energy TeV emission should be correlated with the birth place of the pulsar and the region of dense soft radiation rather than with its present position, provided that the injection rate of relativistic particles into the PWNa has been much more efficient at early times. The high energy TeV emission should be correlated with the location of dense clouds which were able to capture high energy hadrons due to their strong magnetic fields.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 14:19:08 GMT" } ]
2009-11-13T00:00:00
[ [ "Bartko", "H.", "" ], [ "Bednarek", "W.", "" ] ]
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712.2965
Thomas G. Rizzo
Carola F. Berger, James S. Gainer, JoAnne L. Hewett, Ben Lillie, Thomas G. Rizzo
General Features of Supersymmetric Signals at the ILC: Solving the LHC Inverse Problem
102 pages, 75 figures; discussion added, typos fixed
Phys.Rev.D80:095018,2009
10.1103/PhysRevD.80.095018
SLAC-PUB-12797
hep-ph hep-ex
null
We present the first detailed, large-scale study of the Minimal Supersymmetric Standard Model (MSSM) at a $\sqrt s=500$ GeV International Linear Collider, including full Standard Model backgrounds and detector simulation. We investigate 242 points in the MSSM parameter space, which we term models, that have been shown by Arkani-Hamed et al to be difficult to study at the LHC. In fact, these points in MSSM parameter space correspond to 162 pairs of models which give indistinguishable signatures at the LHC, giving rise to the so-called LHC Inverse Problem. We first determine whether the production of the various SUSY particles is visible above the Standard Model background for each of these parameter space points, and then make a detailed comparison of their various signatures. Assuming an integrated luminosity of 500 fb$^{-1}$, we find that only 82 out of 242 models lead to visible signatures of some kind with a significance $\geq 5$ and that only 57(63) out of the 162 model pairs are distinguishable at $5(3)\sigma$. Our analysis includes PYTHIA and CompHEP SUSY signal generation, full matrix element SM backgrounds for all $2\to 2, 2\to 4$, and $2\to 6$ processes, ISR and beamstrahlung generated via WHIZARD/GuineaPig, and employs the fast SiD detector simulation org.lcsim.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 23:54:20 GMT" }, { "version": "v2", "created": "Thu, 28 Feb 2008 15:45:47 GMT" } ]
2009-11-18T00:00:00
[ [ "Berger", "Carola F.", "" ], [ "Gainer", "James S.", "" ], [ "Hewett", "JoAnne L.", "" ], [ "Lillie", "Ben", "" ], [ "Rizzo", "Thomas G.", "" ] ]
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712.2966
Nils Lavesson
Nils Lavesson, Leif Lonnblad
Merging parton showers and matrix elements -- back to basics
null
JHEP 0804:085,2008
10.1088/1126-6708/2008/04/085
LU-TP 07-38
hep-ph
null
We make a thorough comparison between different schemes of merging fixed-order tree-level matrix element generators with parton-shower models. We use the most basic benchmark of the O(alpha_S) correction to e+e- -> jets, where the simple kinematics allows us to study in detail the transition between the matrix-element and parton-shower regions. We find that the CKKW-based schemes give a reasonably smooth transition between these regions, although problems may occur if the parton shower used is not ordered in transverse momentum. However, the so-called Pseudo-Shower and MLM schemes turn out to have potentially serious problems due to different scale definitions in different regions of phase space, and due to sensitivity to the details in the initial conditions of the parton shower programs used.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 14:09:55 GMT" }, { "version": "v2", "created": "Wed, 23 Apr 2008 09:11:56 GMT" } ]
2009-04-30T00:00:00
[ [ "Lavesson", "Nils", "" ], [ "Lonnblad", "Leif", "" ] ]
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712.2967
Malek Zareyan
G. Mohammadkhani, M. Zareyan, and Ya. M. Blanter
Magnetic interference pattern in planar SNS Josephson junctions
6 pages, 4 figures, Accepted by Phys. Rev. B
Phys. Rev. B 77, 014520 (2008)
10.1103/PhysRevB.77.014520
null
cond-mat.supr-con cond-mat.mes-hall
null
We study the Josephson current through a ballistic normal metal layer of thickness $D$ on which two superconducting electrodes are deposited within a distance $L$ of each other. In the presence of an ({\it in-layer}) magnetic field we find that the oscillations of the critical current $I_c(\Phi)$ with the magnetic flux $\Phi$ are significantly different from an ordinary magnetic interference pattern. Depending on the ratio $L/D$ and temperature, $I_c(\Phi)$-oscillations can have a period smaller than flux quantum $\Phi_0$, nonzero minima and damping rate much smaller than $1/\Phi$. Similar anomalous magnetic interference pattern was recently observed experimentally.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 14:13:42 GMT" } ]
2009-11-13T00:00:00
[ [ "Mohammadkhani", "G.", "" ], [ "Zareyan", "M.", "" ], [ "Blanter", "Ya. M.", "" ] ]
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712.2968
John F. Donoghue
Thibault Damour and John F. Donoghue
Constraints on the variability of quark masses from nuclear binding
21 pages, 7 figures
Phys.Rev.D78:014014,2008
10.1103/PhysRevD.78.014014
null
hep-ph hep-th nucl-th
null
Based on recent work on nuclear binding, we update and extend the anthropic constraints on the light quark masses, with results that are more tightly constrained than previously obtained. We find that heavy nuclei would fall apart (because the attractive nuclear central potential becomes too weak) if the sum of the light quark masses m_u+m_d would exceed their physical values by 64% (at 95% confidence level). We summarize the anthropic constraints that follow from requiring the existence both of heavy atoms and of hydrogen. With the additional assumption that the quark Yukawa couplings do not vary, these constraints provide a remarkably tight anthropic window for the Higgs vacuum expectation value: 0.39 < v/v_physical < 1.64.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 14:21:35 GMT" } ]
2008-12-18T00:00:00
[ [ "Damour", "Thibault", "" ], [ "Donoghue", "John F.", "" ] ]
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712.2969
Tord Riemann
J. Gluza and T. Riemann
New results for 5-point functions
9 pages, 1 figure, to appear in Proc. of Linear Collider Workshop 2007 (LCWS 07), Hamburg (Germany), May 30 - June 3, 2007
ECONF C0705302:LOOP01,2007
null
DESY 07-013, HEPTOOLS 07-086, SFB/CPP-07-86
hep-ph
null
Bhabha scattering is one of the processes at the ILC where high precision data will be expected. The complete NNLO corrections include radiative loop corrections, with contributions from Feynman diagrams with five external legs. We take these diagrams as an example and discuss several features of the evaluation of pentagon diagrams. The tensor functions are usually reduced to simpler scalar functions. Here we study, as an alternative, the application of Mellin-Barnes representations to 5-point functions. There is no evidence for an improved numerical evaluation of their finite, physical parts. However, the approach gives interesting insights into the treatment of the IR-singularities.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 14:23:11 GMT" } ]
2009-02-16T00:00:00
[ [ "Gluza", "J.", "" ], [ "Riemann", "T.", "" ] ]
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712.297
Anette Wr{\aa}lsen
Anette Wr{\aa}lsen
Rigid objects in higher cluster categories
2nd version 17 pages. More details have been added and some proofs have been improved. Some references have also been added
null
null
null
math.RT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study maximal $m$-rigid objects in the $m$-cluster category $\mathcal C_H^m$ associated with a finite dimensional hereditary algebra $H$ with $n$ nonisomorphic simple modules. We show that all maximal $m$-rigid objects in these categories have exactly $n$ nonisomorphic indecomposable summands, and that any almost complete $m$-rigid object in $\mathcal C_H^m$ has exactly $m+1$ nonisomorphic complements. We also show that the maximal $m$-rigid objects and the $m$-cluster tilting objects in these categories coincide, and that the class of finite dimensional algebras associated with maximal $m$-rigid objects is closed under certain factor algebras.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 14:23:12 GMT" }, { "version": "v2", "created": "Tue, 10 Feb 2009 16:11:40 GMT" } ]
2009-02-10T00:00:00
[ [ "Wrålsen", "Anette", "" ] ]
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712.2971
Rui Azevedo
R. Azevedo, N. Calvet, L. Hartmann, D.Folha, F.Gameiro, J. Muzerolle
CaII Infrared triplet line models in Classical T Tauri stars
null
Astron.Astrophys.225:456,2006
10.1051/0004-6361:20054315
null
astro-ph
null
We study the formation of the calcium II infrared triplet lines 8498\AA, 8542\AA and 8662\AA, in the accreting magnetospheric flows of Classical T Tauri stars (CTTS), and present a grid of models for a large range of magnetospheric conditions. We apply our models to the interpretation of multi epoch observations of the CTTS DI Cep. We find that these lines form in the magnetospheric infall and that the variability of the CaII triplet lines in DI Cep can be explained in the context of changes in the mass accretion rate/temperature of the accretion column gas.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 14:26:10 GMT" } ]
2009-06-25T00:00:00
[ [ "Azevedo", "R.", "" ], [ "Calvet", "N.", "" ], [ "Hartmann", "L.", "" ], [ "Folha", "D.", "" ], [ "Gameiro", "F.", "" ], [ "Muzerolle", "J.", "" ] ]
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712.2972
Ricardo Sa Earp
Ricardo Sa Earp and Eric Toubiana
An asymptotic theorem for minimal surfaces and existence results for minimal graphs in $H^2 \times R$
This paper was presented in the International Congress on Minimal and Constant Mean Curvature Surfaces, Buzios, Brazil, August 2007 (27 pages 7 figures)
null
null
null
math.DG
null
In this paper we prove a general and sharp Asymptotic Theorem for minimal surfaces in $H^2\times R$. As a consequence, we prove that there is no properly immersed minimal surface whose asymptotic boundary $C$ is a Jordan curve homologous to zero in the asymptotic boundary of $ H^2\times R,$ say $\partial_\infty H^2\times R$, such that $C$ is contained in a slab between two horizontal circles of $\partial_\infty H^2\times R$ with width equal to $\pi.$ We construct minimal vertical graphs in $H^2\times R$ over certain unbounded admissible domains taking certain prescribed finite boundary data and certain prescribed asymptotic boundary data. Our admissible unbounded domains $\Om$ in $H^2\times \{0\}$ are non necessarily convex and non necessarily bounded by convex arcs; each component of its boundary is properly embedded with zero, one or two points on its asymptotic boundary, satisfying a further geometric condition.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 00:11:43 GMT" } ]
2007-12-19T00:00:00
[ [ "Earp", "Ricardo Sa", "" ], [ "Toubiana", "Eric", "" ] ]
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712.2973
Joana Sousa
J. C. Sousa and M. S. Cunha
Towards the undestanding of radial velocity pulsation in roAp stars
5 pages and 5 figures
J.Phys.Conf.Ser.118:012074,2008
10.1088/1742-6596/118/1/012074
null
astro-ph
null
High-resolution spectroscopic time series of rapidly oscillating Ap stars show evidence for a co-existence of standing and running waves in their atmospheric layers. With the purpose of understanding these observations we have carried out a theoretical analysis of the pulsations in the outermost layers of these stars, starting from the simplest possible model that still retains all important physical ingredients. In our analysis we considered an isothermal atmosphere in a plane-parallel approximation. Moreover we assumed that in the region considered the magnetic pressure is much larger than the gas pressure and, consequently, that the magnetoacoustic wave has decoupled into its acoustic and magnetic components. Using the analytical solutions for the velocity components appropriate to this model we estimate the velocity component parallel to the line of sight averaged over the visible stellar disk. Fitting the latter to a function of the form Acos($\sigma$t+phase), with $\sigma$ the dimensionless oscillation frequency and t the dimensionless time, we derive the amplitude A and the phase for our model as function of height in the atmosphere.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 14:35:20 GMT" } ]
2009-06-23T00:00:00
[ [ "Sousa", "J. C.", "" ], [ "Cunha", "M. S.", "" ] ]
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712.2974
Roland Speicher
Roland Speicher
On the rate of convergence and Berry-Esseen type theorems for a multivariate free central limit theorem
14 pages
null
null
null
math.OA
null
We address the question of a Berry Esseen type theorem for the speed of convergence in a multivariate free central limit theorem. For this, we estimate the difference between the operator-valued Cauchy transforms of the normalized partial sums in an operator-valued free central limit theorem and the Cauchy transform of the limiting operator-valued semicircular element.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 14:36:41 GMT" } ]
2007-12-19T00:00:00
[ [ "Speicher", "Roland", "" ] ]
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712.2975
Loredana Prisinzano
L. Prisinzano (1), G. Micela (1), E. Flaccomio (1), J. R. Stauffer (2), T. Megeath (3), L. Rebull (2), M. Robberto (4), K. Smith (4), E. D. Feigelson (5), N. Grosso (6), S. Wolk (7) ((1) INAF - Osservatorio Astronomico di Palermo, Italy (2) Spitzer Science Center, California Institute of Technology, Pasadena, CA (3) Department of Physics, University of Toledo, OH (4) Space Telescope Science Institute, Baltimore, MD (5) Department of Astronomy and Astrophysics, Penn State University PA, USA (6) Observatoire astronomique de Strasbourg, Universite' Louis-Pasteur, CNRS, INSU, Strasbourg, France (7) Harvard Smithsonian Center for Astrophysics, Cambridge)
X-ray properties of protostars in the Orion Nebula
Comments: 38 pages, 14 Postscript figures, 14 Tables. Accepted for publication in ApJ
null
10.1086/528842
null
astro-ph
null
The origin and evolution of the X-rays in very young stellar objects (YSOs) are not yet well understood since it is very hard to observe YSOs in the protostellar phase. We study the X-ray properties of Class 0-I objects in the Orion Nebula Cluster (ONC) and compare them with those of the more evolved Class II and III members. Using Chandra Orion Ultradeep Project (COUP) data, we study the X-ray properties of stars in different evolutionary classes: luminosities, NH, temperatures and time variability are compared in order to understand if the interaction between the circumstellar material and the central object can influence the X-ray emission. We have assembled the deepest and most complete photometric catalog of objects in the ONC region from the UV to 8 microns using data from HST, [email protected] ESO and ISPI@4m CTIO telescopes, and Spitzer IRAC. We select high probability candidate Class 0-I protostars, distinguishing between those having a spectral energy distribution which rises from K up to 8 microns (Class 0-Ia) from those where the SED rises from K up to 4.5 microns and decreasing afterwards (Class 0-Ib). We select a sample of bona fide Class II stars and a set of Class III stars with IR emission consistent with normal photospheres. Our principal result is that Class 0-Ia objects are significantly less luminous in X-rays, both in the total and hard bands, than the more evolved Class II stars with mass larger than 0.5 Msun; these latter show X-ray luminosities similar to those of Class 0-Ib stars. This result supports the hypothesis that the onset of X-ray emission occurs at a very early stage of star formation. Temporal variability and spectral properties of Class 0-I stars are similar to those of the more evolved Class II and III objects, except for a larger absorption likely due to gas in the circumstellar material.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 15:14:15 GMT" } ]
2009-11-13T00:00:00
[ [ "Prisinzano", "L.", "" ], [ "Micela", "G.", "" ], [ "Flaccomio", "E.", "" ], [ "Stauffer", "J. R.", "" ], [ "Megeath", "T.", "" ], [ "Rebull", "L.", "" ], [ "Robberto", "M.", "" ], [ "Smith", "K.", "" ], [ "Feigelson", "E. D.", "" ], [ "Grosso", "N.", "" ], [ "Wolk", "S.", "" ] ]
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712.2976
Massimo Bianchi
Massimo Bianchi and Sergio Ferrara
Enriques and Octonionic Magic Supergravity Models
24 pages
JHEP 0802:054,2008
10.1088/1126-6708/2008/02/054
CERN-PH-TH/256, ROM2F/2007/22, UCLA/07/TEP/29
hep-th
null
We reconsider the Enriques Calabi Yau (FHSV) model and its string derivation and argue that the Octonionic magic supergravity theory admits a string interpretation closely related to the Enriques model. The uplift to D=6 of the Octonionic magic model has 16 abelian vectors related to the rank of Type I and Heterotic strings.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 14:48:44 GMT" } ]
2009-12-10T00:00:00
[ [ "Bianchi", "Massimo", "" ], [ "Ferrara", "Sergio", "" ] ]
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712.2977
Massimo Cappi
M. Cappi (1), F. Tombesi (1,2), and M. Giustini (1,2) ((1) INAF-IASF Bologna, (2) Universita' degli Studi di Bologna)
Outflows and winds in AGNs: a case for Simbol-X
5 pages, 6 figures, to appear in proceedings of "Simbol-X: the hard X-ray Universe in focus", held in Bologna (Italy), May 14-16, 2007
null
null
null
astro-ph
null
Chandra and XMM-Newton X-ray observations are accumulating evidence for massive, high velocity outflows in Seyfert galaxies and quasars, most likely originating very close to the central supermassive black hole. These results are offering new potential to probe the launching regions of relativistic jets/outflows, and to quantify their feedback impact on the host galaxy and/or cluster of galaxies. The most important signature of these phenomena is the detection of blueshifted absorption lines of highly ionized iron at energies usually greater than ~7 keV. The lack of sensitivity of present day X-ray observatories at these energies gives rise to bias against the detection of more ``extreme'' outflows, with highest velocity and ionization, which would be blueshifted at energies >10 keV. Thus, simulations with Simbol-X were carried out to test its capability of detecting absorption lines/edges between 5-20 keV, in order to probe the dynamics (i.e. measurement of velocity variations) of the absorbing gas, as well as the highest (up to relativistic speeds) velocity and ionization components. We found that the unprecedented sensitivity of Simbol-X between 5-30 keV is a great opportunity to obtain important improvements in this research field.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 14:58:12 GMT" } ]
2007-12-19T00:00:00
[ [ "Cappi", "M.", "" ], [ "Tombesi", "F.", "" ], [ "Giustini", "M.", "" ] ]
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712.2978
V. A. Kuz'menko
V. A. Kuz'menko
On the physical nature of Anderson localization effect
6 pages, 2 figures, substantial text overlap with arXiv:0712.2978v1
null
null
null
physics.gen-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
An alternative explanation of the physical nature of Anderson localization phenomenon and one of the most direct ways of its experimental study are discussed.
[ { "version": "v1", "created": "Tue, 18 Dec 2007 14:58:47 GMT" }, { "version": "v2", "created": "Tue, 15 Jan 2008 13:55:07 GMT" }, { "version": "v3", "created": "Sat, 23 Feb 2008 08:06:30 GMT" }, { "version": "v4", "created": "Tue, 3 Jun 2008 11:19:35 GMT" }, { "version": "v5", "created": "Tue, 29 Jul 2008 08:43:37 GMT" }, { "version": "v6", "created": "Fri, 5 Apr 2013 15:37:00 GMT" } ]
2013-04-08T00:00:00
[ [ "Kuz'menko", "V. A.", "" ] ]
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