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47

Sep 23, 2013
09/13

by
Daniel Maldonado-Mundo; Lianyi He; Patrik Ohberg; Manuel Valiente

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We consider the effect of a momentum kick on the ground state of a non-interacting two-dimensional Fermi gas subject to Rashba spin-orbit coupling. Although the total momentum is a constant of motion, the gas does not obey the rules of Galilean relativity. Upon imprinting a small overall velocity to the non-interacting gas, we find that the Fermi sea is deformed in a non-trivial way. We also consider a weakly repulsive Fermi gas, and find, from its Hartree shift, that the total ground state of...

Source: http://arxiv.org/abs/1303.2628v2

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70

Sep 18, 2013
09/13

by
Josu Doncel; Urtzi Ayesta; Konstantine Avrachenkov; Peter Jacko

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In this paper we address the problem of fast and fair transmission of flows in a router, which is a fundamental issue in networks like the Internet. We model the interaction between a TCP source and a bottleneck queue with the objective of designing optimal packet admission controls in the bottleneck queue. We focus on the relaxed version of the problem obtained by relaxing the fixed buffer capacity constraint that must be satisfied at all time epoch. The relaxation allows us to reduce the...

Source: http://arxiv.org/abs/1209.3638v2

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110

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The survey of more than 24,000 people in twenty-four countries, conducted March 17 to April 21, finds a change in global opinion that could present a formidable challenge to the United States in the future. Around the world, people have a new concern: slumping economic conditions. However, the publics of two emerging Asian superpowers—China and India—remain upbeat about national economic conditions, though Indians are less positive than they were a year ago. In contrast, some of the most...

Topics: documentcloud, chinafile, 4130-china-file

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60

Sep 23, 2013
09/13

by
Pablo Shmerkin

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We prove that the set of exceptional $\lambda\in (1/2,1)$ such that the associated Bernoulli convolution is singular has zero Hausdorff dimension, and likewise for biased Bernoulli convolutions, with the exceptional set independent of the bias. This improves previous results by Erd\"os, Kahane, Solomyak, Peres and Schlag, and Hochman. A theorem of this kind is also obtained for convolutions of homogeneous self-similar measures. The proofs are very short, and rely on old and new results on...

Source: http://arxiv.org/abs/1303.3992v2

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64

Sep 23, 2013
09/13

by
Paweł J. Szabłowski

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Throughout the paper we treat vector of orthogonal polynomials ${p_{j}(x))}_{j=0}^{n}$ as a linear transformation of the vector ${x^{j}}_{j=0}^{n}$ by some lower triangular $% (n+1)\times (n+1)$ matrix $\mathbf{\Pi}_{n}.$ Using Cholesky decomposition of the moment matrix of measure $\alpha $ with infinite support we give interpretation of the matrix $\mathbf{\Pi}_{n}.$ Using this approach we are able to prove quickly some known and formulate some new properties of the system of orthogonal...

Source: http://arxiv.org/abs/1303.0627v2

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43

Sep 21, 2013
09/13

by
Taha Sochi; P. J. Storey

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Resonances, which are also described as autoionizing or quasi-bound states, play an important role in the scattering of atoms and ions with electrons. The current article is an overview of the main methods, including a recently-proposed one, that are used to find and analyze resonances.

Source: http://arxiv.org/abs/1301.7222v2

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47

Sep 21, 2013
09/13

by
V. D. Pal'shin; K. Hurley; D. S. Svinkin; R. L. Aptekar; S. V. Golenetskii; D. D. Frederiks; E. P. Mazets; P. P. Oleynik; M. V. Ulanov; T. Cline; I. G. Mitrofanov; D. V. Golovin; A. S. Kozyrev; M. L. Litvak; A. B. Sanin; W. Boynton; C. Fellows; K. Harshman; J. Trombka; T. McClanahan; R. Starr; J. Goldsten; R. Gold; A. Rau; A. von Kienlin; V. Savchenko; D. M. Smith; W. Hajdas; S. D. Barthelmy; J. Cummings; N. Gehrels; H. Krimm; D. Palmer; K. Yamaoka; M. Ohno; Y. Fukazawa; Y. Hanabata; T....

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Between the launch of the \textit{GGS Wind} spacecraft in 1994 November and the end of 2010, the Konus-\textit{Wind} experiment detected 296 short-duration gamma-ray bursts (including 23 bursts which can be classified as short bursts with extended emission). During this period, the IPN consisted of up to eleven spacecraft, and using triangulation, the localizations of 271 bursts were obtained. We present the most comprehensive IPN localization data on these events. The short burst detection...

Source: http://arxiv.org/abs/1301.3740v2

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58

Sep 18, 2013
09/13

by
W. T. Giele; D. A. Kosower; P. Z. Skands

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We present a simple formalism for the evolution of timelike jets in which tree-level matrix element corrections can be systematically incorporated, up to arbitrary parton multiplicities and over all of phase space, in a way that exponentiates the matching corrections. The scheme is cast as a shower Markov chain which generates one single unweighted event sample, that can be passed to standard hadronization models. Remaining perturbative uncertainties are estimated by providing several...

Source: http://arxiv.org/abs/1102.2126v2