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712.4279
Troy Lee
Troy Lee, Adi Shraibman
Disjointness is hard in the multi-party number on the forehead model
23 pages. Added background to method and references to more recent work. Journal version to appear in Computational Complexity
null
null
null
cs.CC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We show that disjointness requires randomized communication Omega(n^{1/(k+1)}/2^{2^k}) in the general k-party number-on-the-forehead model of complexity. The previous best lower bound for k >= 3 was log(n)/(k-1). Our results give a separation between nondeterministic and randomized multiparty number-on-the-forehead communication complexity for up to k=log log n - O(log log log n) many players. Also by a reduction of Beame, Pitassi, and Segerlind, these results imply subexponential lower bounds on the size of proofs needed to refute certain unsatisfiable CNFs in a broad class of proof systems, including tree-like Lovasz-Schrijver proofs.
[ { "version": "v1", "created": "Thu, 27 Dec 2007 20:45:53 GMT" }, { "version": "v2", "created": "Tue, 9 Jun 2009 12:15:09 GMT" } ]
2009-06-09T00:00:00
[ [ "Lee", "Troy", "" ], [ "Shraibman", "Adi", "" ] ]
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712.428
Emil Yuzbashyan
Emil A. Yuzbashyan and Oleksandr Tsyplyatyev
Dynamics of emergent Cooper pairing at finite temperatures
4 pages, 1 figure; title edited to match the journal title
Phys. Rev. B 79, 132504 (2009)
10.1103/PhysRevB.79.132504
null
cond-mat.supr-con cond-mat.mes-hall
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the time evolution of a system of fermions with pairing interactions at a finite temperature. The dynamics is triggered by an abrupt increase of the BCS coupling constant. We show that if initially the fermions are in a normal phase, the amplitude of the BCS order parameter averaged over the Boltzman distribution of initial states exhibits damped oscillations with a relatively short decay time. The latter is determined by the temperature, the single-particle level spacing, and the ground state value of the BCS gap for the new coupling. In contrast, the decay is essentially absent when the system was in a superfluid phase before the coupling increase.
[ { "version": "v1", "created": "Thu, 27 Dec 2007 20:50:07 GMT" }, { "version": "v2", "created": "Wed, 2 Jan 2008 03:49:07 GMT" }, { "version": "v3", "created": "Thu, 16 Apr 2009 22:47:30 GMT" }, { "version": "v4", "created": "Sun, 18 Jul 2021 04:02:26 GMT" } ]
2021-07-20T00:00:00
[ [ "Yuzbashyan", "Emil A.", "" ], [ "Tsyplyatyev", "Oleksandr", "" ] ]
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712.4281
Christopher Graney
Christopher M. Graney
Letter to the Editor of Sky and Telescope Concerning Galileo's Observations of Mizar
Text of letter with footnotes to distinguish author's material from material editorially added (and later corrected) by Sky and Telescope
Sky and Telescope: May 2006 p. 12 (letter); July 2007 p. 12 (correction)
null
null
physics.hist-ph
null
Work published in Sky and Telescope in 2004 discusses Galileo's observations of the star Mizar. These observations raise questions regarding Galileo's assumptions about the universe and the conclusions he drew from his observations. Galileo would have expected Mizar to reveal annual parallax and thus provide evidence of Earth's motion, but Mizar shows no such parallax.
[ { "version": "v1", "created": "Thu, 27 Dec 2007 21:01:18 GMT" } ]
2007-12-31T00:00:00
[ [ "Graney", "Christopher M.", "" ] ]
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712.4282
Shihshu Walter Wei
Shihshu Walter Wei
On 1-Harmonic Functions
This is a contribution to the Proceedings of the 2007 Midwest Geometry Conference in honor of Thomas P. Branson, published in SIGMA (Symmetry, Integrability and Geometry: Methods and Applications) at http://www.emis.de/journals/SIGMA/
SIGMA 3 (2007), 127, 10 pages
10.3842/SIGMA.2007.127
null
math.DG math.GT
null
Characterizations of entire subsolutions for the 1-harmonic equation of a constant 1$-tension field are given with applications in geometry via transformation group theory. In particular, we prove that every level hypersurface of such a subsolution is calibrated and hence is area-minimizing over $\mathbb{R}$; and every 7-dimensional $SO(2)\times SO(6)$-invariant absolutely area-minimizing integral current in $\mathbb{R}^8$ is real analytic. The assumption on the $SO(2) \times SO(6)$-invariance cannot be removed, due to the first counter-example in $\mathbb{R}^8$, proved by Bombieri, De Girogi and Giusti.
[ { "version": "v1", "created": "Thu, 27 Dec 2007 21:10:10 GMT" } ]
2008-04-25T00:00:00
[ [ "Wei", "Shihshu Walter", "" ] ]
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712.4283
Christopher M. Johns-Krull
Christopher M. Johns-Krull, Peter R. McCullough, Christopher J. Burke, Jeff A. Valenti, K. A. Janes, J. N. Heasley, L. Prato, R. Bissinger, M. Fleenor, C. N. Foote, E. Garcia-Melendo, B. L. Gary, P. J. Howell, F. Mallia, G. Masi, T. Vanmunster
XO-3b: A Massive Planet in an Eccentric Orbit Transiting an F5V Star
26 pages, 10 figures. Accepted by ApJ. Current version has several small corrections as a result of a bug in the fitting software
null
10.1086/528950
null
astro-ph
null
We report the discovery of a massive (Mpsini = 13.02 +/- 0.64 Mjup; total mass 13.25 +/- 0.64 Mjup), large (1.95 +/- 0.16 Rjup) planet in a transiting, eccentric orbit (e = 0.260 +/- 0.017) around a 10th magnitude F5V star in the constellation Camelopardalis. We designate the planet XO-3b, and the star XO-3, also known as GSC 03727-01064. The orbital period of XO-3b is 3.1915426 +/- 0.00014 days. XO-3 lacks a trigonometric distance; we estimate its distance to be 260 +/- 23 pc. The radius of XO-3 is 2.13 +/- 0.21 Rsun, its mass is 1.41 +/- 0.08 Msun, its vsini = 18.54 +/- 0.17 km/s, and its metallicity is [Fe/H] = -0.177 +/- 0.027. This system is unusual for a number of reasons. XO-3b is one of the most massive planets discovered around any star for which the orbital period is less than 10 days. The mass is near the deuterium burning limit of 13 Mjup, which is a proposed boundary between planets and brown dwarfs. Although Burrows et al. (2001) propose that formation in a disk or formation in the interstellar medium in a manner similar to stars is a more logical way to differentiate planets and brown dwarfs, our current observations are not adequate to address this distinction. XO-3b is also unusual in that its eccentricity is large given its relatively short orbital period. Both the planetary radius and the inclination are functions of the spectroscopically determined stellar radius. Analysis of the transit light curve of XO-3b suggests that the spectroscopically derived parameters may be over estimated. Though relatively noisy, the light curves favor a smaller radius in order to better match the steepness of the ingress and egress. The light curve fits imply a planetary radius of 1.25 +/- 0.15 Rjup, which would correspond to a mass of 12.03 +/- 0.46 Mjup.
[ { "version": "v1", "created": "Thu, 27 Dec 2007 21:11:58 GMT" }, { "version": "v2", "created": "Wed, 2 Jan 2008 20:09:23 GMT" }, { "version": "v3", "created": "Fri, 14 Mar 2008 05:30:10 GMT" } ]
2009-11-13T00:00:00
[ [ "Johns-Krull", "Christopher M.", "" ], [ "McCullough", "Peter R.", "" ], [ "Burke", "Christopher J.", "" ], [ "Valenti", "Jeff A.", "" ], [ "Janes", "K. A.", "" ], [ "Heasley", "J. N.", "" ], [ "Prato", "L.", "" ], [ "Bissinger", "R.", "" ], [ "Fleenor", "M.", "" ], [ "Foote", "C. N.", "" ], [ "Garcia-Melendo", "E.", "" ], [ "Gary", "B. L.", "" ], [ "Howell", "P. J.", "" ], [ "Mallia", "F.", "" ], [ "Masi", "G.", "" ], [ "Vanmunster", "T.", "" ] ]
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712.4284
Congjun Wu
Congjun Wu and S. Das Sarma
The $p_{x,y}$-orbital counterpart of graphene: cold atoms in the honeycomb optical lattice
null
Phys. Rev. B 77, 235107 (2008).
10.1103/PhysRevB.77.235107
null
cond-mat.str-el cond-mat.mtrl-sci
null
We study the ground state properties of the interacting spinless fermions in the $p_{x,y}$-orbital bands in the two dimensional honeycomb optical lattice, which exhibit different novel features from those in the $p_z$-orbital system of graphene. In addition to two dispersive bands with Dirac cones, the tight-binding band structure exhibits another two completely flat bands over the entire Brillouin zone. With the realistic sinusoidal optical potential, the flat bands acquire a finite but much smaller band width compared to the dispersive bands. The band flatness dramatically enhanced interaction effects giving rise to various charge and bond ordered states at commensurate fillings of $n=\frac{i}{6} (i=1 \sim 6)$. At $n=1/6$, the many-body ground states can be exactly solved as the close packed hexagon states which can be stabilized even in the weak interacting regime. The dimerization of bonding strength occurs at both $n=1/2$ and 5/6, and the latter case is accompanied with the charge density wave of holes. The trimerization of bonding strength and charge inhomogeneity appear at $n={1/3},{2/3}$. These crystalline orders exhibit themselves in the noise correlations of the time of flight spectra.
[ { "version": "v1", "created": "Thu, 27 Dec 2007 21:29:46 GMT" }, { "version": "v2", "created": "Mon, 12 May 2008 17:55:30 GMT" } ]
2008-09-22T00:00:00
[ [ "Wu", "Congjun", "" ], [ "Sarma", "S. Das", "" ] ]
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712.4285
Yongseok Oh
Yongseok Oh, Che Ming Ko, K. Nakayama
Nucleon and Delta resonances in K Sigma(1385) photoproduction from nucleons
13 pages, 6 figures, REVTeX, to appear in Phys. Rev. C
Phys.Rev.C77:045204,2008
10.1103/PhysRevC.77.045204
null
nucl-th hep-ph
null
The reaction mechanisms for $K\Sigma(1385)$ photoproduction from the reaction $\gamma p \to K^+\Sigma^{0}(1385)$ in the resonance energy region are investigated in a hadronic model. Both contributions from $N$ and $\Delta$ resonances of masses around 2 GeV as given in the Review of Particle Data Group and by the quark model predictions are included. The Lagrangians for describing the decays of these resonances into $K\Sigma(1385)$ are constructed with the coupling constants determined from the decay amplitudes predicted by a quark model. Comparing the resulting total cross section for the reaction $\gamma p \to K^+\Sigma^{0}(1385)$ with the preliminary data from the Thomas Jefferson National Accelerator Facility, we find that the most important contributions are from the two-star rated resonances $\Delta(2000) F_{35}$, $\Delta(1940) D_{33}$, and $N(2080) D_{13}$, as well as the missing resonance $N\frac32^-(2095)$ predicted in the quark model. Predictions on the differential cross section and photon asymmetry in this reaction are also given.
[ { "version": "v1", "created": "Thu, 27 Dec 2007 21:37:26 GMT" }, { "version": "v2", "created": "Mon, 24 Mar 2008 17:56:03 GMT" } ]
2008-11-26T00:00:00
[ [ "Oh", "Yongseok", "" ], [ "Ko", "Che Ming", "" ], [ "Nakayama", "K.", "" ] ]
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712.4286
Kay J\"org Wiese
Kay Joerg Wiese and Pierre Le Doussal
How to measure the effective action for disordered systems
Proceedings for Path Integrals 2007; 8 pages
Path Integrals - New Trends and Perspectives, World Scientific, Singapore, 2008
null
LPTENS 08/01
cond-mat.dis-nn
null
In contrast to standard critical phenomena, disordered systems need to be treated via the Functional Renormalization Group. The latter leads to a coarse grained disorder landscape, which after a finite renormalization becomes non-analytic, thus overcoming the predictions of the seemingly exact dimensional reduction. We review recent progress on how the non-analytic effective action can be measured both in simulations and experiments, and confront theory with numerical work.
[ { "version": "v1", "created": "Thu, 27 Dec 2007 21:42:58 GMT" } ]
2009-11-18T00:00:00
[ [ "Wiese", "Kay Joerg", "" ], [ "Doussal", "Pierre Le", "" ] ]
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712.4287
Martin Cederwall
Martin Cederwall
M-branes on U-folds
8 pp
null
null
null
hep-th
null
We give a preliminary discussion of how the addition of extra coordinates in M-theory, which together with the original ones parametrise a U-fold, can serve as a tool for formulating brane dynamics with manifest U-duality. The redundant degrees of freedom are removed by generalised self-duality constraints or calibration conditions made possible by the algebraic structure of U-duality. This is the written version of an invited talk at the 7th International Workshop "Supersymmetries and Quantum Symmetries", Dubna, July 30-August 4, 2007.
[ { "version": "v1", "created": "Thu, 27 Dec 2007 21:43:57 GMT" } ]
2007-12-31T00:00:00
[ [ "Cederwall", "Martin", "" ] ]
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712.4288
Sidney Redner
V. Sood, Tibor Antal, S. Redner
Voter Models on Heterogeneous Networks
13 pages, 9 figures, 2 column revetx4 format; version 2 is the final published version that contains minor changes in response to referee comments
Phys. Rev. E 77, 041121 (2008)
10.1103/PhysRevE.77.041121
null
physics.soc-ph cond-mat.stat-mech
null
We study simple interacting particle systems on heterogeneous networks, including the voter model and the invasion process. These are both two-state models in which in an update event an individual changes state to agree with a neighbor. For the voter model, an individual "imports" its state from a randomly-chosen neighbor. Here the average time T_N to reach consensus for a network of N nodes with an uncorrelated degree distribution scales as N mu_1^2/mu_2, where mu_k is the kth moment of the degree distribution. Quick consensus thus arises on networks with broad degree distributions. We also identify the conservation law that characterizes the route by which consensus is reached. Parallel results are derived for the invasion process, in which the state of an agent is "exported" to a random neighbor. We further generalize to biased dynamics in which one state is favored. The probability for a single fitter mutant located at a node of degree k to overspread the population--the fixation probability--is proportional to k for the voter model and to 1/k for the invasion process.
[ { "version": "v1", "created": "Thu, 27 Dec 2007 22:02:07 GMT" }, { "version": "v2", "created": "Tue, 22 Apr 2008 23:32:43 GMT" } ]
2009-09-29T00:00:00
[ [ "Sood", "V.", "" ], [ "Antal", "Tibor", "" ], [ "Redner", "S.", "" ] ]
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712.4289
Brian Welsch
G. H. Fisher and B. T. Welsch
FLCT: A Fast, Efficient Method for Performing Local Correlation Tracking
9 pages, 3 figures
null
null
null
astro-ph
null
We describe the computational techniques employed in the recently updated Fourier local correlation tracking (FLCT) method. The FLCT code is then evaluated using a series of simple, 2D, known flow patterns that test its accuracy and characterize its errors.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 14:55:46 GMT" } ]
2007-12-31T00:00:00
[ [ "Fisher", "G. H.", "" ], [ "Welsch", "B. T.", "" ] ]
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712.429
Adom Giffin
Adom Giffin
Updating Probabilities: A Complex Agent Based Example
Presented at the 7th International Conference on Complex Systems, Boston, 2007. 9 pages, 1 figure
InterJournal of Complex Systems, 2273 (2008)
null
null
stat.ME cond-mat.stat-mech nlin.AO physics.bio-ph physics.data-an q-bio.MN stat.AP
null
It has been shown that one can accommodate data (Bayes) and constraints (MaxEnt) in one method, the method of Maximum (relative) Entropy (ME) (Giffin 2007). In this paper we show a complex agent based example of inference with two different forms of information; moments and data. In this example, several agents each receive partial information about a system in the form of data. In addition, each agent agrees or is informed that there are certain global constraints on the system that are always true. The agents are then asked to make inferences about the entire system. The system becomes more complex as we add agents and allow them to share information. This system can have a geometrical form, such as a crystal structure. The shape may dictate how the agents are able to share information, such as sharing with nearest neighbors. This method can be used to model many systems where the agents or cells have local or partial information but must adhere to some global rules. This could also illustrate how the agents evolve and could illuminate emergent behavior of the system.
[ { "version": "v1", "created": "Thu, 27 Dec 2007 22:15:49 GMT" } ]
2016-09-08T00:00:00
[ [ "Giffin", "Adom", "" ] ]
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712.4291
Renato Renner
Robert Koenig, Renato Renner
Sampling of min-entropy relative to quantum knowledge
48 pages, latex
IEEE Transactions on Information Theory, vol. 57, pp. 4760-4787, 2011
10.1109/TIT.2011.2146730
null
quant-ph
null
Let X_1, ..., X_n be a sequence of n classical random variables and consider a sample of r positions selected at random. Then, except with (exponentially in r) small probability, the min-entropy of the sample is not smaller than, roughly, a fraction r/n of the total min-entropy of all positions X_1, ..., X_n, which is optimal. Here, we show that this statement, originally proven by Vadhan [LNCS, vol. 2729, Springer, 2003] for the purely classical case, is still true if the min-entropy is measured relative to a quantum system. Because min-entropy quantifies the amount of randomness that can be extracted from a given random variable, our result can be used to prove the soundness of locally computable extractors in a context where side information might be quantum-mechanical. In particular, it implies that key agreement in the bounded-storage model (using a standard sample-and-hash protocol) is fully secure against quantum adversaries, thus solving a long-standing open problem.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 17:21:10 GMT" } ]
2012-06-04T00:00:00
[ [ "Koenig", "Robert", "" ], [ "Renner", "Renato", "" ] ]
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712.4292
Zoltan Bajnok
Z. Bajnok and Zs. Simon
Solving topological defects via fusion
LaTeX, 24 pages, 34 eps figures
Nucl.Phys.B802:307-329,2008
10.1016/j.nuclphysb.2008.04.003
null
hep-th
null
Integrable defects in two-dimensional integrable models are purely transmitting thus topological. By fusing them to integrable boundaries new integrable boundary conditions can be generated, and, from the comparison of the two solved boundary theories, explicit solutions of defect models can be extracted. This idea is used to determine the transmission factors and defect energies of topological defects in sinh-Gordon and Lee-Yang models. The transmission factors are checked in Lagrangian perturbation theory in the sinh-Gordon case, while the defect energies are checked against defect thermodynamic Bethe ansatz equations derived to describe the ground-state energy of diagonal defect systems on a cylinder. Defect bootstrap equations are also analyzed and are closed by determining the spectrum of defect bound-states in the Lee-Yang model.
[ { "version": "v1", "created": "Thu, 27 Dec 2007 23:16:02 GMT" } ]
2008-11-26T00:00:00
[ [ "Bajnok", "Z.", "" ], [ "Simon", "Zs.", "" ] ]
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712.4293
Alexei Vinogradov
Alexey V. Vinogradov (Lebedev Physical Institute, Moscow, Russia)
QCD Nuclear Factor and the Moments of the Multiplicity Distributions in High-Order Perturbative Gluodynamics
6 pages, 5 figures
Bull.Lebedev Phys.Inst.35:131-134,2008
10.3103/S1068335608050011
null
nucl-th hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The equation of gluodynamics with modified integral kernel is solved up to 2NLO (next-to-next-to-leading order) and 3NLO (next-to-next-to-next-to-leading order) in perturbative QCD. A relationship between the nuclear factor Ns and the ratio of the cumulant and factorial moments of the multiplicity distribution is examined. A comparison of theoretical results and experimental data in p-Pb and Pb-Pb collisions at 200A GeV and 546A GeV is carried out.
[ { "version": "v1", "created": "Thu, 27 Dec 2007 23:27:04 GMT" }, { "version": "v2", "created": "Wed, 12 Nov 2008 01:04:30 GMT" } ]
2009-02-18T00:00:00
[ [ "Vinogradov", "Alexey V.", "", "Lebedev Physical Institute, Moscow, Russia" ] ]
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712.4294
Anne Thomas
Anne Thomas
Hyperbolic Geometry and Distance Functions on Discrete Groups
Submitted in partial fulfillment of the requirements of the degree of Bachelor of Science with Honours in Pure Mathematics, University of New South Wales, Australia, June 2002. 105 pages
null
null
null
math.GR math.HO
null
Chapter 1 is a short history of non-Euclidean geometry, which synthesises my readings of mostly secondary sources. Chapter 2 presents each of the main models of hyperbolic geometry, and describes the tesselation of the upper half-plane induced by the action of $PSL(2,\mathbb{Z})$. Chapter 3 gives background on symmetric spaces and word metrics. Chapter 4 then contains a careful proof of the following theorem of Lubotzky--Mozes--Raghunathan: the word metric on $PSL(2,\mathbb{Z})$ is not Lipschitz equivalent to the metric induced by its action on the associated symmetric space (the upper half-plane), but for $n \geq 3$, these two metrics on $PSL(n,\mathbb{Z})$ are Lipschitz equivalent.
[ { "version": "v1", "created": "Thu, 27 Dec 2007 23:30:50 GMT" } ]
2007-12-31T00:00:00
[ [ "Thomas", "Anne", "" ] ]
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712.4295
Victor Blanco
Victor Blanco and Justo Puerto
Short Rational Generating Functions For Multiobjective Linear Integer Programming
18 pages
null
null
null
math.OC
null
This paper presents algorithms for solving multiobjective integer programming problems. The algorithm uses Barvinok's rational functions of the polytope that defines the feasible region and provides as output the entire set of nondominated solutions for the problem. Theoretical complexity results on the algorithm are provided in the paper. Specifically, we prove that encoding the entire set of nondominated solutions of the problem is polynomially doable, when the dimension of the decision space is fixed. In addition, we provide polynomial delay algorithms for enumerating this set. An implementation of the algorithm shows that it is useful for solving multiobjective integer linear programs.
[ { "version": "v1", "created": "Thu, 27 Dec 2007 23:32:24 GMT" }, { "version": "v2", "created": "Mon, 3 Mar 2008 16:51:10 GMT" }, { "version": "v3", "created": "Tue, 4 Mar 2008 11:16:20 GMT" } ]
2008-03-04T00:00:00
[ [ "Blanco", "Victor", "" ], [ "Puerto", "Justo", "" ] ]
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712.4296
Eberhard H.-A. Gerbracht
Clemens Adelmann, Eberhard H.-A. Gerbracht
Letters from William Burnside to Robert Fricke: Automorphic Functions, and the Emergence of the Burnside Problem
documentclass amsart, 17 pages
Archive for History of Exact Sciences 63 (2009), 33-50
10.1007/s00407-008-0021-2
null
math.HO math.GR
null
Two letters from William Burnside have recently been found in the Nachlass of Robert Fricke that contain instances of Burnside's Problem prior to its first publication. We present these letters as a whole to the public for the first time. We draw a picture of these two mathematicians and describe their activities leading to their correspondence. We thus gain an insight into their respective motivations, reactions, and attitudes, which may sharpen the current understanding of professional and social interactions of the mathematical community at the turn of the 20th century.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 01:21:44 GMT" } ]
2009-02-17T00:00:00
[ [ "Adelmann", "Clemens", "" ], [ "Gerbracht", "Eberhard H. -A.", "" ] ]
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712.4297
Xiaolei Zhang
Xiaolei Zhang
On the Nature of Quantum Phenomena
null
null
null
null
quant-ph
null
It is shown that a coherent understanding of all quantized phenomena, including those governed by unitary evolution equations as well as those related to irreversible quantum measurements, can be achieved in a scenario of successive nonequilibrium phase transitions, with the lowest hierarchy of these phase transitions occurring in a ``resonant cavity'' formed by the entire matter and energy content of the universe. In this formalism, the physical laws themselves are resonantly-selected and ordered in the universe cavity in a hierarchical manner, and the values of fundamental constants are determined through a Generalized Mach's Principle. The existence of a preferred reference frame in this scenario is shown to be consistent with the relational nature of the origin of physical laws. Covariant unitary evolution is shown to connect smoothly with the reduction of wavefunction in the preferred frame during quantum measurement. The superluminal nature of quantum processes in the lowest hierarchy coexists with the universal speed limit obeyed by processes in higher hierarchies. A natural quantum-to-classical transition is also obtained which is stable against the diffusive tendency of the unitary quantum evolution processes. In this formalism a realistic quasi-classical ontology is established for the foundations of quantum mechanics.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 20:53:15 GMT" } ]
2007-12-31T00:00:00
[ [ "Zhang", "Xiaolei", "" ] ]
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712.4298
Yong-Joo Doh
Yong-Joo Doh, Aarnoud L. Roest, Erik P. A. M. Bakkers, Silvano De Franceschi, and Leo P. Kouwenhoven
Quantum Interference Effects in InAs Semiconductor Nanowires
9 pages, 3 figures
Journal of the Korean Physical Society, vol.54, pp. 135~139,(2009)
10.3938/jkps.54.135
null
cond-mat.mes-hall cond-mat.supr-con
null
We report quantum interference effects in InAs semiconductor nanowires strongly coupled to superconducting electrodes. In the normal state, universal conductance fluctuations are investigated as a function of magnetic field, temperature, bias and gate voltage. The results are found to be in good agreement with theoretical predictions for weakly disordered one-dimensional conductors. In the superconducting state, the fluctuation amplitude is enhanced by a factor up to ~ 1.6, which is attributed to a doubling of charge transport via Andreev reflection. At a temperature of 4.2 K, well above the Thouless temperature, conductance fluctuations are almost entirely suppressed, and the nanowire conductance exhibits anomalous quantization in steps of e^{2}/h.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 08:17:33 GMT" } ]
2020-11-04T00:00:00
[ [ "Doh", "Yong-Joo", "" ], [ "Roest", "Aarnoud L.", "" ], [ "Bakkers", "Erik P. A. M.", "" ], [ "De Franceschi", "Silvano", "" ], [ "Kouwenhoven", "Leo P.", "" ] ]
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712.4299
Robert Maier
Robert S. Maier
P-symbols, Heun Identities, and 3F2 Identities
20 pages
pp. 139-159 in `Special Functions and Orthogonal Polynomials' (eds. D. Dominici and R. S. Maier), American Mathematical Society, 2008
10.1090/conm/471
null
math.CA
null
The usefulness of Riemann P-symbols in deriving identities involving the parametrized special function Hl is explored. Hl is the analytic local solution of the Heun equation, the canonical second-order differential equation on the Riemann sphere with four regular singular points. The identities discussed include ones coming from Moebius automorphisms and F-homotopies, and also quadratic and biquadratic transformations. The case when Hl is identical to a generalized hypergeometric function of 3F2 type is examined, and Pfaff and Euler transformations of 3F2(a1,a2,e+1;b1,e;x) are derived. They extend several 3F2 identities of Bailey and Slater.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 01:10:02 GMT" }, { "version": "v2", "created": "Sun, 30 Dec 2007 02:00:02 GMT" } ]
2018-06-22T00:00:00
[ [ "Maier", "Robert S.", "" ] ]
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712.43
Doris Rosenbaum
E. S. Abers, A. K. Bhatia, D. A. Dicus, W. W. Repko, D. C. Rosenbaum, and V. L. Teplitz
Charges on Strange Quark Nuggets in Space
CitationS added, new subsection added, more discussion, same numerical results
Phys.Rev.D79:023513,2009
10.1103/PhysRevD.79.023513
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Since Witten's seminal 1984 paper on the subject, searches for evidence of strange quark nuggets (SQNs) have proven unsuccessful. In the absence of experimental evidence ruling out SQNs, the validity of theories introducing mechanisms that increase their stability should continue to be tested. To stimulate electromagnetic SQN searches, particularly space searches, we estimate the net charge that would develop on an SQN in space exposed to various radiation baths (and showers) capable of liberating their less strongly bound electrons, taking into account recombination with ambient electrons. We consider, in particular, the cosmic background radiation, radiation from the sun, and diffuse galactic and extragalactic $\gamma $-ray backgrounds. A possible dramatic signal of SQNs in explosive astrophysical events is noted.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 00:59:02 GMT" }, { "version": "v2", "created": "Sun, 2 Mar 2008 21:27:16 GMT" }, { "version": "v3", "created": "Sat, 8 Nov 2008 20:47:56 GMT" } ]
2009-02-26T00:00:00
[ [ "Abers", "E. S.", "" ], [ "Bhatia", "A. K.", "" ], [ "Dicus", "D. A.", "" ], [ "Repko", "W. W.", "" ], [ "Rosenbaum", "D. C.", "" ], [ "Teplitz", "V. L.", "" ] ]
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712.4301
J. Ponce de Leon
J. Ponce de Leon
Embeddings for 4D Einstein equations with a cosmological constant
null
Grav.Cosmol.14:241-247,2008
10.1134/S0202289308030067
null
gr-qc
null
There are many ways of embedding a 4D spacetime in a given higher-dimensional manifold while, satisfying the field equations. In this work we extend and generalize a recent paper by Mashhoon and Wesson ({\it Gen. Rel. Gravit.} {\bf 39}, 1403(2007)) by showing different ways of embedding a solution of the 4D Einstein equations, in vacuum with a cosmological constant, in a Ricci-flat, as well as in an anti-de Sitter, 5D manifold. These embeddings lead to different physics in 4D. In particular, to non-equivalent cosmological terms as functions of the extra coordinate. We study the motion of test particles for different embeddings and show that there is a complete equivalence between several definitions for the effective mass of test particles measured in 4D, obtained from different theoretical approaches like the Hamilton-Jacobi formalism and the principle of least action. For the case under consideration, we find that the effective mass observed in 4D is the same regardless of whether we consider null or non-null motion in 5D.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 01:43:28 GMT" }, { "version": "v2", "created": "Mon, 31 Dec 2007 02:23:54 GMT" } ]
2009-11-13T00:00:00
[ [ "de Leon", "J. Ponce", "" ] ]
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712.4302
Brudnyi Alexander
Alexander Brudnyi
Holomorphic L^{p}-functions on Coverings of Strongly Pseudoconvex Manifolds
8 pages
null
null
null
math.CV math.FA
null
In this paper we will show how to construct holomorphic L^{p}-functions on unbranched coverings of strongly pseudoconvex manifolds. Also, we prove some extension and approximation theorems for such functions.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 01:43:44 GMT" } ]
2007-12-31T00:00:00
[ [ "Brudnyi", "Alexander", "" ] ]
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712.4303
Koji Usami
Koji Usami
Quantum-noise-limited Angular Momentum Measurement for a Micron-sized Dielectric Object
5 pages, 1 figure
null
null
null
quant-ph
null
An approach is described for observing quantum features of micron-sized spinning objects. Specifically, we consider a birefringent (uniaxial positive) dielectric object in the shape of an oblate (i.e., frisbee-like) symmetric top. It can be trapped in the air, its extraordinary axis can be aligned, and its angular momentum along the extraordinary axis can be stabilized, all optically. We show that the angular momentum quantum noise of the object perpendicular to the gigantic angular momentum along the extraordinary axis can be measured as a linear birefringent phase shift of a probe laser in an analogous fashion to the spin quantum nondemolition (QND) measurement in atomic physics.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 02:32:50 GMT" } ]
2007-12-31T00:00:00
[ [ "Usami", "Koji", "" ] ]
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712.4304
Debashish Chowdhury
Debashish Chowdhury (IITK), Ashok Garai (IITK) and Jian-Sheng Wang (NUS)
Traffic of single-headed motor proteins KIF1A: effects of lane changing
4 pages REVTEX with 4 EPS figures; new schematic figure of the model
Physical Review E (Rapid Communication), vol.77, 050902 (R), (2008)
10.1103/PhysRevE.77.050902
null
physics.bio-ph cond-mat.stat-mech q-bio.SC
null
KIF1A kinesins are single-headed motor proteins which move on cylindrical nano-tubes called microtubules (MT). A normal MT consists of 13 protofilaments on which the equispaced motor binding sites form a periodic array. The collective movement of the kinesins on a MT is, therefore, analogous to vehicular traffic on multi-lane highways where each protofilament is the analogue of a single lane. Does lane-changing increase or decrease the motor flux per lane? We address this fundamental question here by appropriately extending a recent model [{\it Phys. Rev. E {\bf 75}, 041905 (2007)}]. By carrying out analytical calculations and computer simulations of this extended model, we predict that the flux per lane can increase or decrease with the increasing rate of lane changing, depending on the concentrations of motors and the rate of hydrolysis of ATP, the ``fuel'' molecules. Our predictions can be tested, in principle, by carrying out {\it in-vitro} experiments with fluorescently labelled KIF1A molecules.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 02:29:42 GMT" }, { "version": "v2", "created": "Fri, 29 Feb 2008 09:27:58 GMT" }, { "version": "v3", "created": "Thu, 17 Apr 2008 13:42:59 GMT" } ]
2008-06-06T00:00:00
[ [ "Chowdhury", "Debashish", "", "IITK" ], [ "Garai", "Ashok", "", "IITK" ], [ "Wang", "Jian-Sheng", "", "NUS" ] ]
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712.4305
Simon Griffiths
Simon Griffiths
One way cuts in oriented graphs
This paper has been withdrawn by the author. now included in "Subgraphs of weakly quasi-random oriented graphs"
null
null
null
math.CO
null
This paper has been withdrawn by the author.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 02:34:39 GMT" }, { "version": "v2", "created": "Fri, 19 Nov 2010 19:11:10 GMT" } ]
2010-11-22T00:00:00
[ [ "Griffiths", "Simon", "" ] ]
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712.4306
Yoshiyuki Fukumoto
Nobutaka Kunisada and Yoshiyuki Fukumoto
An exact calculation of the transverse susceptibility for an antiferromagnetic Ising $\Delta$ chain
15 pages, 5 figures
null
10.1143/PTP.119.913
null
cond-mat.stat-mech cond-mat.str-el
null
We study the transverse susceptibility of the fully frustrated antiferromagnetic Ising $\Delta$-chain, extending Minami's transfer-matrix method for the transverse susceptibility of general-type Ising linear-chains [JPSJ 67,1998,2255]. For transverse fields $\Gamma_1$ on tip spin sites and $\Gamma_2$ on bottom spin sites, we calculate zero-field transverse-susceptibilities $\chi_{tip}^x=\lim_{\Gamma_1,\Gamma_2 -> 0}M_{tip}^x/\Gamma_1$ and $\chi_{bottom}^x=\lim_{\Gamma_1,\Gamma_2 -> 0}M^x_{bottom}/\Gamma_2$, where $M_{tip (bottom)}^x$ denotes the magnetization for tip (bottom) spin sites. Both the transverse susceptibilities follow Curie's law at low temperatures. We also calculate $\chi_{bottom}^x(\Gamma_1>0)$, transverse susceptibility of the bottom spin chain under finite tip-spin transverse-fields, to understand the Curie type behavior in the zero-field susceptibility. Using the second-order perturbation theory, we discuss the $\Gamma_1$ dependence of $\chi_{bottom}^x(\Gamma_1)$ at zero temperature.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 03:36:45 GMT" } ]
2009-11-13T00:00:00
[ [ "Kunisada", "Nobutaka", "" ], [ "Fukumoto", "Yoshiyuki", "" ] ]
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712.4307
A Brooks Harris
A. B. Harris
Erratum: Landau Analysis of the Symmetry of the Magnetic Structure and Magnetoelectric Interaction in Multiferroics [Phys. Rev. B 76, 05447 (2007)]
null
null
10.1103/PhysRevB.76.054447
null
cond-mat.mtrl-sci
null
An error in the spin wavefunction for the rare earth sublattices of TbMn_2O_5 is corrected.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 03:28:25 GMT" } ]
2009-11-13T00:00:00
[ [ "Harris", "A. B.", "" ] ]
[ 0.031062685, -0.0054404293, -0.041561313, 0.0405165479, -0.0556019507, 0.0618705489, -0.0317252204, -0.0124225263, -0.0349104814, -0.0855689049, 0.0185000077, -0.0741529241, 0.0580482334, 0.0482631065, 0.0273932628, 0.1169118956, -0.0163467694, -0.0135819614, 0.0345282517, 0.0543788113, -0.0324387178, -0.1138540432, 0.0829697326, 0.0285909213, -0.0084218355, -0.0611570515, 0.0624821186, -0.0460206792, 0.0892383307, 0.0420454741, 0.0997879207, -0.0021404969, -0.0348340385, -0.0540220626, -0.1272066683, 0.0948953554, 0.0211246647, -0.0387328006, -0.0019207136, 0.0005542358, -0.0716556758, -0.0862314403, -0.0804724842, 0.132201165, 0.0155440839, 0.044746574, -0.0057462147, -0.0156077892, 0.1420882195, 0.0007170824, 0.0135055156, -0.0858237296, -0.001583872, -0.0746625662, 0.0536653139, -0.0594242662, 0.0483140685, 0.1788843721, 0.0290241167, -0.0024430968, -0.0120912585, -0.0090206647, -0.0106451493, -0.0433705412, -0.0990744233, 0.0333560742, -0.0903085768, -0.0075108502, 0.0871488005, -0.0408478118, -0.1011639535, -0.0097596459, 0.0207424331, -0.0314958803, -0.0220675021, -0.0457913429, 0.0128493514, 0.0880151913, -0.0413574539, 0.0759366751, 0.009453861, -0.0218636449, 0.0854669809, -0.0571818426, -0.0645206869, 0.0249597207, 0.0075936671, -0.0035451979, -0.0733884573, -0.0574876294, 0.0839890167, -0.0168181881, -0.0229848586, 0.036847122, -0.0457148962, -0.140355438, -0.0378918909, -0.0437018089, 0.0711970031, -0.0153020034, -0.0526460297, -0.0034082315, -0.0308333468, -0.0180795528, 0.1026419178, 0.0174170192, 0.0644187629, -0.0961184949, -0.0580991991, -0.0044498127, 0.0245010443, -0.0846005902, -0.1084518358, -0.031292025, 0.0098424628, -0.0493078716, -0.042070955, -0.0204493888, -0.0538182035, 0.0943857133, -0.0423002951, 0.1198678166, 0.0838361233, -0.1064132676, 0.0968319997, 0.0337892696, 0.0953540355, -0.0225261804, -0.0068483157, -0.0504800491, 0.1236391738, 0.0157224592, 0.0094283791, -0.0385289416, -0.0284889936, -0.0128620919, 0.1040179506, -0.0221312083, 0.0083199069, -0.0319545604, 0.0217234939, 0.1443306357, 0.0953540355, -0.0463264659, 0.010326623, 0.0529518127, 0.0890344754, -0.0772107765, 0.073184602, 0.0283361003, 0.0378154442, 0.04418597, 0.0260172281, 0.0409752242, 0.0359807312, -0.1476942748, 0.0671198666, 0.0624311566, 0.0395227447, -0.0163212884, 0.0689036101, 0.0697700009, 0.0668650419, 0.0250616502, 0.1165041849, 0.0369490497, -0.1529945582, -0.0117408801, -0.0441095233, -0.1159945428, -0.0920413584, -0.0303746685, -0.0862824023, 0.0087913256, 0.0530537404, -0.0083645005, 0.0357004292, -0.1335262209, -0.054990381, 0.0220165383, 0.0395991914, -0.0105368504, 0.0292789377, 0.0743567795, -0.0721653178, -0.0334580019, -0.0255458094, 0.0266287997, -0.0035674947, 0.0296611693, 0.0073515871, 0.0988195986, 0.0792493448, 0.0251380969, -0.083632268, -0.0453326628, 0.0443643443, 0.0457913429, -0.0066317176, 0.006854686, -0.012046665, 0.0087403618, 0.0899518281, 0.0061666691, -0.0974435657, 0.0606474094, -0.0558058098, 0.0126200123, 0.0306549724, -0.0677314326, 0.033687342, -0.0264249425, 0.0301708113, 0.034477286, 0.0427080058, 0.0073770694, -0.1240468845, -0.0873526558, 0.008096939, 0.1016735956, -0.0538691692, 0.057589557, -0.0203092378, 0.1713416725, -0.0059054778, 0.09423282, 0.0517541543, -0.0442369319, -0.0331776999, 0.0838870853, 0.0656419024, 0.0083899833, 0.10478241, 0.049995888, 0.0115943579, -0.070789285, 0.0658967197, -0.0365158543, -0.0744587108, 0.0081733847, -0.0260936748, 0.0899008662, -0.0460971259, 0.0996350273, -0.0673746839, 0.0271894056, 0.0182961505, 0.0515502989, 0.122823745, 0.002277463, -0.016729001, 0.0820523798, -0.0477789454, 0.0410261899, -0.0386053883, 0.0232141968 ]
712.4308
Kwan-Woo Lee
K.-W. Lee (UCD, Ku), W. E. Pickett (UCD)
Half Semimetallic Antiferromagnetism in the Sr$_2$CrTO$_6$ System, T=Os, Ru
6 pages
Phys. Rev. B 77, 115101 (2008)
10.1103/PhysRevB.77.115101
null
cond-mat.mtrl-sci cond-mat.str-el
null
Double perovskite Sr$_2$CrOsO$_6$ is (or is very close to) a realization of a spin-asymmetric semimetallic compensated ferrimagnet, according to first principles calculations. This type of near-half metallic antiferromagnet is an unusual occurrence, and more so in this compound because the zero gap is accidental rather than being symmetry determined. The large spin-orbit coupling (SOC) of osmium upsets the spin balance (no net spin moment without SOC): it reduces the Os spin moment by 0.27 $\mu_B$ and induces an Os orbital moment of 0.17 $\mu_B$ in the opposite direction. The effects combine (with small oxygen contributions) to give a net total moment of 0.54 $\mu_B$ per cell in \scoo, reflecting a large impact of SOC in this compound. This value is in moderately good agreement with the measured saturation moment of 0.75 $\mu_B$. The value of the net moment on the Os ion obtained from neutron diffraction (0.73 $\mu_B$ at low temperature) differs from the calculated value (1.14 $\mu_B$). Rather surprisingly, in isovalent Sr$_2$CrRuO$_6$ the smaller SOC-induced spin changes and orbital moments (mostly on Ru) almost exactly cancel. This makes Sr$_2$CrRuO$_6$ a "half (semi)metallic antiferromagnet" (practically vanishing net total moment) even when SOC is included, with the metallic channel being a small-band-overlap semimetal. Fixed spin moment (FSM) calculations are presented for each compound, illustrating how they provide different information than in the case of a nonmagnetic material. These FSM results indicate that the Cr moment is an order of magnitude stiffer against longitudinal fluctuations than is the Os moment.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 03:31:42 GMT" } ]
2008-03-24T00:00:00
[ [ "Lee", "K. -W.", "", "UCD, Ku" ], [ "Pickett", "W. E.", "", "UCD" ] ]
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712.4309
Masaru Takizawa
K. Maekawa, M. Takizawa, H. Wadati, T. Yoshida, A. Fujimori, H. Kumigashira, M. Oshima
Effects of electron-phonon coupling in angle-resolved photoemission spectra of SrTiO3
null
Phys. Rev. B 79, 113103 (2009)
null
null
cond-mat.mtrl-sci cond-mat.str-el
null
We have studied the O 2p valence-band structure of Nb-doped SrTiO3, in which a dilute concentration of electrons are doped into the d0 band insulator, by angle-resolved photoemission spectroscopy (ARPES) measurements. We found that ARPES spectra at the valence band maxima at the M [k = (pi/a, pi/a, 0)]and R [k = (pi/a, pi/a, pi/a)] points start from ~ 3.3 eV below the Fermi level (EF), consistent with the indirect band gap of 3.3 eV and the EF position at the bottom of the conduction band. The peak position of the ARPES spectra were, however, shifted toward higher binding energies by ~ 500 meV from the 3.3 eV threshold. Because the bands at M and R have pure O 2p character, we attribute this ~ 500 meV shift to strong coupling of the oxygen p hole with optical phonons in analogy with the peak shifts observed for d-electron photoemission spectra in various transition-metal oxides.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 03:40:45 GMT" } ]
2009-03-23T00:00:00
[ [ "Maekawa", "K.", "" ], [ "Takizawa", "M.", "" ], [ "Wadati", "H.", "" ], [ "Yoshida", "T.", "" ], [ "Fujimori", "A.", "" ], [ "Kumigashira", "H.", "" ], [ "Oshima", "M.", "" ] ]
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712.431
Nana Pan
Xiaoping Zheng, Nana Pan, Li Zhang
1122 Hz rotation of XTE J1739-285 as a probe of quark matter in the interior of the neutron star
4 pages, 3 figures
null
null
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The recent discovery of burst oscillation at 1122Hz in the X-ray transient XTE J1739-285 supports the suggestion that it contains a submillisecond pulsar. In our estimations of the enormous dissipation effect in the transition boundary layer between quark matter core and hadron matter envelope, combing the viscosities of bulk mater in previous works, we show that XTE J1739-285 can be uniquely restricted to a quark star masquerading as a neutron star (hybrid star) that contains a pure quark matter or mixed quark-hadron matter core from minimizing gravitational wave radiation (r-mode) instability and Keplerian motion constraints at 1122Hz level through a three-parameters image. Such constraints allow the stellar radii in the range $9{\rm km}\leq R\leq 12{\rm km}$ and the stellar masses in the range $1.2M_\odot\leq M\leq 2.0M_\odot$. It perhaps implies that submillisecond pulsars are just probes of quark matter.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 03:53:46 GMT" }, { "version": "v2", "created": "Tue, 8 Jan 2008 07:10:22 GMT" }, { "version": "v3", "created": "Wed, 19 Nov 2008 08:25:19 GMT" } ]
2008-11-19T00:00:00
[ [ "Zheng", "Xiaoping", "" ], [ "Pan", "Nana", "" ], [ "Zhang", "Li", "" ] ]
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712.4311
Valery Pipin
V.V.Pipin and M.R.E.Proctor
Closure tests for mean field magnetohydrodynamics using a self consistent reduced model
submitted to MNRAS
MNRAS, V.388, Issue 1, pp. 367-374, 2008
10.1111/j.1365-2966.2008.13396.x
null
astro-ph
null
The mean electromotive force and alpha effect are computed for a forced turbulent flow using a simple nonlinear dynamical model. The results are used to check the applicability of two basic analytic ansatze of mean-field magnetohydrodynamics - the second order correlation approximation (SOCA) and the tau approximation. In the numerical simulations the effective Reynolds number Re is 2-20, while the magnetic Prandtl number varies from 0.1 to $10^{7}$. We present evidence that the $\tau$ approximation may be appropriate in dynamical regimes where there is a small-scale dynamo. Catastrophic quenching of the $\alpha$ effect is found for high $P_{m}$. Our results indicate that for high $P_{m}$ SOCA gives a very large value of the $\alpha$ coefficient compared with the ``exact'' solution. The discrepancy depends on the properties of the random force that drives the flow, with a larger difference occuring for $\delta$-correlated force compared with that for a steady random force.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 04:33:56 GMT" } ]
2009-01-25T00:00:00
[ [ "Pipin", "V. V.", "" ], [ "Proctor", "M. R. E.", "" ] ]
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712.4312
Ricardo Mu\~noz
Ricardo R. Munoz, Steven R. Majewski and Kathryn V. Johnston
Modeling The Structure And Dynamics of Dwarf Spheroidal Galaxies with Dark Matter And Tides
Submitted to ApJ on Aug. 4th, resubmitted Dec. 31st
null
10.1086/587125
null
astro-ph
null
We report the results of N-body simulations of disrupting satellites aimed at exploring whether the observed features of dSphs can be accounted for with simple, mass-follows-light (MFL) models including tidal disruption. As a test case, we focus on the Carina dwarf Spheroidal (dSph), which presently has the most extensive data at large radius. We find that previous N-body, MFL simulations of dSphs did not sufficiently explore the parameter space of satellite mass, density and orbital shape to find adequate matches to Galactic dSph systems, whereas with a systematic survey of parameter space we are able to find tidally disrupting, MFL satellite models that rather faithfully reproduce Carina's velocity profile, velocity dispersion profile and projected density distribution over its entire sampled radius. The successful MFL model satellites have very eccentric orbits, currently favored by Cold Dark Matter (CDM) models, and central velocity dispersions that still yield an accurate representation of the bound mass and observed central M/L~40 of Carina, despite inflation of the velocity dispersion outside the dSph core by unbound debris. Our survey of parameter space also allows us to address a number of commonly held misperceptions of tidal disruption and its observable effects on dSph structure and dynamics. The simulations suggest that even modest tidal disruption can have a profound effect on the observed dynamics of dSph stars at large radii. Satellites that are well-described by tidally disrupting MFL models could still be fully compatible with L-CDM if for example they represent a later stage in the evolution of luminous subhalos.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 04:58:36 GMT" } ]
2009-11-13T00:00:00
[ [ "Munoz", "Ricardo R.", "" ], [ "Majewski", "Steven R.", "" ], [ "Johnston", "Kathryn V.", "" ] ]
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712.4313
Yasuyuki Watabe
Yasuyuki Watabe (1 and 2), Nozomu Kawakatu (3), Masatoshi Imanishi (3) ((1) Center for Computational Sciences, University of Tsukuba, (2) INAF-Osservatorio Astrofisico di Arcetri, (3) National Astronomical Observatory of Japan)
Nuclear/Circumnuclear Starbursts and Active Galactic Nuclei Mass Accretion in Seyfert Galaxies
27 pages, 8 figures, accepted for publication in ApJ
null
10.1086/528933
null
astro-ph
null
We investigated the correlation between nuclear/circumnuclear starbursts around the active galactic nuclei (AGNs) and the AGN activities for 43 Seyfert galaxies in the CfA and 12 micron samples. We found that circumnuclear starburst luminosity as well as nuclear starburst luminosity are positively correlated with AGN luminosity. Moreover, nuclear starburst luminosity is more strongly correlated with the AGN luminosity normalized with AGN Eddington luminosity than is circumnuclear starburst luminosity. This implies that starbursts nearer the AGN could have a greater effect on AGN mass accretion. We also discuss these results from the viewpoint of the radiation effects from starbursts and sequential starbursts.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 04:59:08 GMT" } ]
2009-11-13T00:00:00
[ [ "Watabe", "Yasuyuki", "", "1 and 2" ], [ "Kawakatu", "Nozomu", "" ], [ "Imanishi", "Masatoshi", "" ] ]
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712.4314
Pyungwon Ko
Nei Cipriano Ribeiro, Takaaki Kajita, Pyungwon Ko, Hisakazu Minakata, Shoei Nakayama, Hiroshi Nunokawa
Probing Nonstandard Neutrino Physics by Two Identical Detectors with Different Baselines
20 pages, 6 figures
Phys.Rev.D77:073007,2008
10.1103/PhysRevD.77.073007
null
hep-ph
null
The Kamioka-Korea two detector system is a powerful experimental setup for resolving neutrino parameter degeneracies and probing CP violation in neutrino oscillation. In this paper, we study sensitivities of this same setup to several nonstandard neutrino physics such as quantum decoherence, tiny violation of Lorentz symmetry, and nonstandard interactions of neutrinos with matter. In most cases, the Kamioka-Korea two-detector setup is more sensitive than the one-detector setup, except for the Lorentz symmetry violation with CPT violation, and the nonstandard neutrino interactions with matter. It can achieve significant improvement on the current bounds on nonstandard neutrino physics.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 15:52:42 GMT" } ]
2008-11-26T00:00:00
[ [ "Ribeiro", "Nei Cipriano", "" ], [ "Kajita", "Takaaki", "" ], [ "Ko", "Pyungwon", "" ], [ "Minakata", "Hisakazu", "" ], [ "Nakayama", "Shoei", "" ], [ "Nunokawa", "Hiroshi", "" ] ]
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712.4315
Mahdi Asgari
Mahdi Asgari, A. Raghuram
A Cuspidality Criterion for the Exterior Square Transfer of Cusp Forms on GL(4)
20 pages
null
null
null
math.NT math.RT
null
For a cuspidal automorphic representation \Pi of GL(4,A), H. Kim proved that the exterior square transfer \wedge^2\Pi is an isobaric automorphic representation of GL(6,A). In this paper we characterize those representations \Pi for which \wedge^2\Pi is cuspidal.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 05:22:05 GMT" } ]
2007-12-31T00:00:00
[ [ "Asgari", "Mahdi", "" ], [ "Raghuram", "A.", "" ] ]
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712.4316
Akihiro Tanaka
Akihiro Tanaka, Keisuke Totsuka, Xiao Hu
Geometric phases and the magnetization process in quantum antiferromagnets
Substantial enhancement from previous submission; added new section on fractionalized phases
Phy. Rev. B 79 064412 (2009)
10.1103/PhysRevB.79.064412
null
cond-mat.stat-mech cond-mat.str-el
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The physics underlying the magnetization process of quantum antiferromagnets is revisited from the viewpoint of geometric phases. A continuum variant of the Lieb-Schultz-Mattis-type approach to the problem is put forth, where the commensurability condition of Oshikawa {\it et al} derives from a Berry connection formulation of the system's crystal momentum. %, similar to that developed by Haldane for ferromagnets. %Building on the physical picture which arises, We then go on to formulate an effective field theory which can deal with higher dimensional cases as well. We find that a topological term, whose principle function is to assign Berry phase factors to space-time vortex objects, ultimately controls the magnetic behavior of the system. We further show how our effective action maps into a ${\bf Z}_2$ gauge theory under certain conditions, which in turn allows for the occurrence of a fractionalized phase with topological order.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 06:44:18 GMT" }, { "version": "v2", "created": "Mon, 15 Dec 2008 08:47:16 GMT" } ]
2009-05-14T00:00:00
[ [ "Tanaka", "Akihiro", "" ], [ "Totsuka", "Keisuke", "" ], [ "Hu", "Xiao", "" ] ]
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712.4317
I Wayan Sudiarta
I. Wayan Sudiarta and D. J. Wallace Geldart
The Finite Difference Time Domain Method for Computing Single-Particle Density Matrix
22 pages, 9 figures, some corrections
null
null
null
physics.comp-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A general method for numerical computation of the thermal density matrix of a single-particle quantum system is presented. The Schrodinger equation in imaginary time tau is solved numerically by the finite difference time domain (FDTD) method using a set of initial wave functions at tau=0 . By choosing this initial set appropriately, the set of wave functions generated by the FDTD method can be used to construct the thermal density matrix. The theoretical basis of the method, a numerical algorithm for its implementation, and illustrative examples in one, two and three dimensions are given in this paper. The numerical results show that the procedure is efficient and accurately determines the density matrix and thermodynamic properties of single-particle systems. Extensions of the method to more general cases are briefly indicated.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 07:08:15 GMT" }, { "version": "v2", "created": "Mon, 7 Jul 2008 04:17:37 GMT" }, { "version": "v3", "created": "Thu, 12 Feb 2009 13:37:48 GMT" } ]
2009-02-12T00:00:00
[ [ "Sudiarta", "I. Wayan", "" ], [ "Geldart", "D. J. Wallace", "" ] ]
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712.4318
Peter de Blanc
Peter de Blanc
Convergence of Expected Utilities with Algorithmic Probability Distributions
2 pages + title page, references
null
null
null
cs.AI
null
We consider an agent interacting with an unknown environment. The environment is a function which maps natural numbers to natural numbers; the agent's set of hypotheses about the environment contains all such functions which are computable and compatible with a finite set of known input-output pairs, and the agent assigns a positive probability to each such hypothesis. We do not require that this probability distribution be computable, but it must be bounded below by a positive computable function. The agent has a utility function on outputs from the environment. We show that if this utility function is bounded below in absolute value by an unbounded computable function, then the expected utility of any input is undefined. This implies that a computable utility function will have convergent expected utilities iff that function is bounded.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 07:50:00 GMT" } ]
2007-12-31T00:00:00
[ [ "de Blanc", "Peter", "" ] ]
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712.4319
Altan Baykal
A. Baykal, U. Kiziloglu, N. Kiziloglu, E. Beklen, M. Ozbey
Recent RXTE/ASM and ROTSEIIId Observations of EXO 2030+375
to appear at Astronomy and Astrophysics
null
10.1051/0004-6361:20078721
null
astro-ph
null
Using the archival RXTE/ASM and SWIFT/BAT observations, the new orbital phases of Type I outbursts of EXO 2030+375 are estimated. A possible correlation between the Type II outburst and optical brightness variations is investigated. In order to estimate the phases of Type I outbursts, we fitted Gaussian profiles to the RXTE/ASM and SWIFT/BAT light curves. The time corresponding to the maximum value of the profiles is treated as the arrival time of Type I outburst. We used differential magnitudes in the time-series analysis of the optical light curve. MIDAS and its suitable packages were used to reduce and analyze the spectra. Prior to the Type II outburst, orbital phases of Type I outbursts were delayed for 6 days after the periastron passage, which is consistent with findings of Wilson et al., (2002, 2005). After the giant Type II outburst, the phase of Type I outbursts underwent a sudden shift of 13 days after the periastron passage. The amplitudes of Type I outbursts were increased between MJD 52500 and 53500. These amplitudes then decreased for 10 orbital cycles until the Type II outburst was triggered. If the change of outburst amplitudes correlated with the mass accretion, then during the decrease of these amplitudes mass should be deposited in a disk around neutron star temporarily. The release of this stored mass may ignite the Type II outburst. We report that the optical light curve became fainter by 0.4 mag during the decrease of amplitude of the Type I outbursts. The observed H$\alpha$ profiles and their equivalent widths during the decay and after the giant outburst are consistent with previous observations of the system.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 07:52:32 GMT" } ]
2009-11-13T00:00:00
[ [ "Baykal", "A.", "" ], [ "Kiziloglu", "U.", "" ], [ "Kiziloglu", "N.", "" ], [ "Beklen", "E.", "" ], [ "Ozbey", "M.", "" ] ]
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712.432
Tam\'as V\'ertesi
K.F. P\'al and T. V\'ertesi
Efficiency of higher dimensional Hilbert spaces for the violation of Bell inequalities
8 pages, no figures, REVTeX; published version
Phys. Rev. A 77, 042105 (2008)
10.1103/PhysRevA.77.042105
null
quant-ph
null
We have determined numerically the maximum quantum violation of over 100 tight bipartite Bell inequalities with two-outcome measurements by each party on systems of up to four dimensional Hilbert spaces. We have found several cases, including the ones where each party has only four measurement choices, where two dimensional systems, i.e., qubits are not sufficient to achieve maximum violation. In a significant proportion of those cases when qubits are sufficient, one or both parties have to make trivial, degenerate 'measurements' in order to achieve maximum violation. The quantum state corresponding to the maximum violation in most cases is not the maximally entangled one. We also obtain the result, that bipartite quantum correlations can always be reproduced by measurements and states which require only real numbers if there is no restriction on the size of the local Hilbert spaces. Therefore, in order to achieve maximum quantum violation on any bipartite Bell inequality (with any number of settings and outcomes), there is no need to consider complex Hilbert spaces.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 17:54:30 GMT" }, { "version": "v2", "created": "Wed, 16 Apr 2008 16:47:50 GMT" } ]
2009-11-13T00:00:00
[ [ "Pál", "K. F.", "" ], [ "Vértesi", "T.", "" ] ]
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712.4321
Salah A. Aly
Salah A. Aly and Andreas Klappenecker
Subsystem Code Constructions
5 pages, trading dimensions of subsystem codes, MDS subsystem codes, and propagation rules. All stabilizer codes are converted to subsystem codes. A talk given at QEC07, and submitted to IEEE ISIT 2008
Proc. of IEEE ISIT 08, Toronto, CA, 2008
null
null
quant-ph cs.IT math.IT
null
Subsystem codes are the most versatile class of quantum error-correcting codes known to date that combine the best features of all known passive and active error-control schemes. The subsystem code is a subspace of the quantum state space that is decomposed into a tensor product of two vector spaces: the subsystem and the co-subsystem. A generic method to derive subsystem codes from existing subsystem codes is given that allows one to trade the dimensions of subsystem and co-subsystem while maintaining or improving the minimum distance. As a consequence, it is shown that all pure MDS subsystem codes are derived from MDS stabilizer codes. The existence of numerous families of MDS subsystem codes is established. Propagation rules are derived that allow one to obtain longer and shorter subsystem codes from given subsystem codes. Furthermore, propagation rules are derived that allow one to construct a new subsystem code by combining two given subsystem codes.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 09:26:40 GMT" }, { "version": "v2", "created": "Sun, 30 Dec 2007 21:29:21 GMT" }, { "version": "v3", "created": "Wed, 9 Jan 2008 02:28:10 GMT" } ]
2008-12-05T00:00:00
[ [ "Aly", "Salah A.", "" ], [ "Klappenecker", "Andreas", "" ] ]
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712.4322
Holger Then
H. Then
Spectral resolution in hyperbolic orbifolds, quantum chaos, and cosmology
24 pages. Contribution to the TSL Expository Lecture Series V "Computational Physical Sciences 2006", Universiti Putra Malaysia
null
null
null
nlin.CD
null
We present a few subjects from physics that have one in common: the spectral resolution of the Laplacian.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 09:54:53 GMT" } ]
2007-12-31T00:00:00
[ [ "Then", "H.", "" ] ]
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712.4323
Bent J{\o}rgensen
Bent J{\o}rgensen, Yuri Goegebeur and Jos\'e Ra\'ul Mart\'inez
Dispersion Models for Extremes
23 pages. Abstract submitted to the 56th Session of the ISI, Lisboa, 2007
null
null
null
math.ST stat.ME stat.TH
null
We propose extreme value analogues of natural exponential families and exponential dispersion models, and introduce the slope function as an analogue of the variance function. The set of quadratic and power slope functions characterize well-known families such as the Rayleigh, Gumbel, power, Pareto, logistic, negative exponential, Weibull and Fr\'echet. We show a convergence theorem for slope functions, by which we may express the classical extreme value convergence results in terms of asymptotics for extreme dispersion models. The main idea is to explore the parallels between location families and natural exponential families, and between the convolution and minimum operations.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 09:56:24 GMT" } ]
2007-12-31T00:00:00
[ [ "Jørgensen", "Bent", "" ], [ "Goegebeur", "Yuri", "" ], [ "Martínez", "José Raúl", "" ] ]
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712.4324
Alexey Shorokhov Dr
V.A. Margulis, A.V. Shorokhov
Hybrid-impurity resonances in anisotropic quantum dots
Submitted to Physica E. 11 pages, 2 figures. New references, figures and paragraphes, minor corrections
null
null
null
cond-mat.mes-hall
null
The absorption of electromagnetic radiation of an anisotropic quantum dot is theoretically investigated taking into account the processes associated with simultaneous scattering from ionized impurities. It is shown that the scattering of electrons by impurities leads to the resonance absorption even if we have only one impurity in the quantum dot. Explicit formula is derived for the absorption coefficient. The positions of the resonances peaks are found. The effects of external magnetic field on the resonance absorption are studied.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 09:56:33 GMT" }, { "version": "v2", "created": "Fri, 16 May 2008 11:38:30 GMT" } ]
2008-05-16T00:00:00
[ [ "Margulis", "V. A.", "" ], [ "Shorokhov", "A. V.", "" ] ]
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712.4325
Alexei Kovalev
Alexei Kovalev and Jason D. Lotay
Deformations of Compact Coassociative 4-folds with Boundary
22 pages. v2: largely rewritten, correcting an error in the previous version, examples and references added
J. Geom. Phys. 59 (2009), 63-73
null
null
math.DG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Coassociative 4-folds are a particular class of 4-dimensional submanifolds which are defined in a 7-dimensional manifold M with a G_2 structure given by a `positive' differential 3-form, sometimes called G_2-form. Assuming that a G_2-form on M is closed, we study deformations of a compact coassociative submanifold N with boundary contained in fixed, codimension 1 submanifold S of M with a compatible Hermitian symplectic structure. We show that `small' coassociative deformations of N with special Lagrangian boundary in S are unobstructed and form a smooth moduli space of finite dimension not greater than the first Betti number of the boundary of N. It is also shown that N is `stable' under small deformations of the closed G_2-form on the ambient 7-manifold M. The results can be compared to those for special Lagrangian submanifolds of Calabi--Yau manifolds proved by A.Butscher in math.DG/0110052.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 09:58:30 GMT" }, { "version": "v2", "created": "Mon, 21 Jul 2008 16:25:08 GMT" } ]
2009-01-13T00:00:00
[ [ "Kovalev", "Alexei", "" ], [ "Lotay", "Jason D.", "" ] ]
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712.4326
Da Xu
Da Xu
A Random Matrix Model of Black Holes
12 pages
null
null
null
physics.gen-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A random matrix model of black holes is given based on analysis of Gaussian complex ensembles, based on the generalization of chRMT of QCD. Spacetime freedoms are incorporated in terms of eigenvalues of the ensemble. Classical observables of black holes can be computed using this model and it satisfies asymptotic freedom and holographic principle.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 10:04:36 GMT" }, { "version": "v2", "created": "Mon, 23 Jun 2008 23:46:37 GMT" } ]
2008-06-24T00:00:00
[ [ "Xu", "Da", "" ] ]
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712.4327
Toyokazu Sekiguchi
Kazuhide Ichikawa, Toyokazu Sekiguchi and Tomo Takahashi
Primordial Helium Abundance from CMB: a constraint from recent observations and a forecast
17 pages, 6 figures, 4 tables; update after WMAP 5-year results, accepted for publication in Phys. Rev. D
Phys.Rev.D78:043509,2008
10.1103/PhysRevD.78.043509
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We studied a constraint on the primordial helium abundance Y_p from current and future observations of CMB. Using the currently available data from WMAP, ACBAR, CBI and BOOMERANG, we obtained the constraint as Y_p = 0.25^{+0.10}_{-0.07} at 68% C.L. We also provide a forecast for the Planck experiment using the Markov chain Monte Carlo approach. In addition to forecasting the constraint on Y_p, we investigate how assumptions for Y_p affect constraints on the other cosmological parameters.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 10:04:40 GMT" }, { "version": "v2", "created": "Mon, 18 Aug 2008 15:43:20 GMT" } ]
2008-11-26T00:00:00
[ [ "Ichikawa", "Kazuhide", "" ], [ "Sekiguchi", "Toyokazu", "" ], [ "Takahashi", "Tomo", "" ] ]
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712.4328
Umberto D'Alesio
U. D'Alesio and F. Murgia (University and INFN, Cagliari, Italy)
Azimuthal and Single Spin Asymmetries in Hard Scattering Processes
70 pages, 34 ps figures. Invited review paper to be published in Progress in Particle and Nuclear Physics
Prog.Part.Nucl.Phys.61:394-454,2008
10.1016/j.ppnp.2008.01.001
null
hep-ph
null
In this article we review the present understanding of azimuthal and single spin asymmetries for inclusive and semi-inclusive particle production in unpolarized and polarized hadronic collisions at high energy and moderately large transverse momentum. After summarizing the experimental information available, we discuss and compare the main theoretical approaches formulated in the framework of perturbative QCD. We then present in some detail a generalization of the parton model with inclusion of spin and intrinsic transverse momentum effects. In this context, we extensively discuss the phenomenology of azimuthal and single spin asymmetries for several processes in different kinematical configurations. A comparison with the predictions of other approaches, when available, is also given. We finally emphasize some relevant open points and challenges for future theoretical and experimental investigation.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 10:33:23 GMT" } ]
2008-12-18T00:00:00
[ [ "D'Alesio", "U.", "", "University and INFN, Cagliari, Italy" ], [ "Murgia", "F.", "", "University and INFN, Cagliari, Italy" ] ]
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712.4329
Karlheinz Kiyek
S. Greco (Torino), K. Kiyek (Paderborn)
On the value-semigroup of a simple complete ideal in a two-dimensional regular local ring
Latex, 7 pages
null
null
null
math.AC
null
Let R be a two-dimensional regular local ring with maximal ideal \mathfrak m, and let \wp be a simple complete \mathfrak m-primary ideal which is residually rational. Let R_0:= R\subsetneqq ...\subsetneqq R_r be the quadratic sequence associated to \wp, let \Gamma_\wp be the value-semigroup associated to \wp, and let ((e_j(\wp))_{0\leq j\leq r} be the multiplicity sequence of \wp. We associate to \wp a sequence of natural integers, the formal characteristic sequence of \wp, and we show that the value-semigroup, the multiplicity sequence and the formal characteristic sequence are equivalent data. Furthermore, we give a new proof that \Gamma_\wp is symmetric, and give a formula for c_\wp, the conductor of \Gamma_\wp, in terms of entries of the Hamburger-Noether tableau of \wp.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 11:53:02 GMT" } ]
2007-12-31T00:00:00
[ [ "Greco", "S.", "", "Torino" ], [ "Kiyek", "K.", "", "Paderborn" ] ]
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712.433
Chang-Guang Shi
Chang-Guang Shi, Minoru Hirayama
Approximate vortex solution of Faddeev model
9pages,4figures
Int.J.Mod.Phys.A23:1361-1369,2008
10.1142/S0217751X08039517
null
hep-th
null
Through an Ansatz specifying the azimuthal-angle dependence of the solution, the static field equation for vortex of the Faddeev model is converted to an algebraic ordinary differential equation. An approximate analytic expression of the vortex solution is explored so that the energy per unit vortex length becomes as small as possible. It is observed that the minimum energy of vortex is approximately proportional to the integer which specifies the solution.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 10:51:14 GMT" } ]
2008-11-26T00:00:00
[ [ "Shi", "Chang-Guang", "" ], [ "Hirayama", "Minoru", "" ] ]
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712.4331
Konrad Tywoniuk
A. Capella, L. Bravina, E.G. Ferreiro, A.B. Kaidalov, K. Tywoniuk, E. Zabrodin
Charmonium dissociation and recombination at RHIC and LHC
16 pages, 5 figures
Eur.Phys.J.C58:437-444,2008
10.1140/epjc/s10052-008-0772-6
null
hep-ph nucl-th
null
Charmonium production at heavy-ion colliders is considered within the comovers interaction model. The formalism is extended by including possible secondary J/psi production through recombination and an estimate of recombination effects is made with no free parameters involved. The comovers interaction model also includes a comprehensive treatment of initial-state nuclear effects, which are discussed in the context of such high energies. With these tools, the model properly describes the centrality and the rapidity dependence of experimental data at RHIC energy, $\sqrt{s}$ = 200 GeV, for both Au+Au and Cu+Cu collisions. Predictions for LHC, $\sqrt{s}$ = 5.5 TeV, are presented and the assumptions and extrapolations involved are discussed.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 10:59:15 GMT" } ]
2008-12-18T00:00:00
[ [ "Capella", "A.", "" ], [ "Bravina", "L.", "" ], [ "Ferreiro", "E. G.", "" ], [ "Kaidalov", "A. B.", "" ], [ "Tywoniuk", "K.", "" ], [ "Zabrodin", "E.", "" ] ]
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712.4332
Peter Waddell
Peter J Waddell
Comparing a Menagerie of Models for Estimating Molecular Divergence Times
null
null
null
null
q-bio.GN q-bio.PE
null
Estimation of molecular evolutionary divergence times requires models of rate change. These vary with regard to the assumption of what quantity is penalized. The possibilities considered are the rate of evolution, the log of the rate of evolution and the inverse of the rate of evolution. These models also vary with regard to how time affects the expected variance of rate change. Here the alternatives are not at all, linearly with time and as the product of rate and time. This results in a set of nine models, both random walks and Brownian motion. A priori any of these models could be correct, yet different researchers may well prefer, or simply use, one rather than the others. Another variable is whether to use a scaling factor to take account of the variance of the process of rate change being unknown and therefore avoid minimizing the penalty function with unrealistically large times. Here the difference these models and assumptions make on a tree of mammals, with the root fixed and with a single internal node fixed, is measured. The similarity of models is measured as the correlation of their time estimates and visualized with a least squares tree. The fit of model to data is measured and Q-Q plots are shown. Comparing model estimates with each other, the age of clades within Laurasiatheria are seen to vary far more across models than those within Supraprimates (informally called Euarchontoglires). Especially problematic are the often-used fossil calibrated nodes of horse/rhino and whale/hippo clashing with times within Supraprimates and in particular no fossil rodent teeth older than ~60 mybp. A scaling factor in addition to penalizing rate change is seen to yield consistent relative time estimates irrespective of exactly where the calibration point is placed.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 20:47:55 GMT" } ]
2007-12-31T00:00:00
[ [ "Waddell", "Peter J", "" ] ]
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712.4333
Anil Zengino\u{g}lu C
An{\i}l Zengino\u{g}lu
Hyperboloidal foliations and scri-fixing
14 pages, 14 figures. Published version
Class.Quant.Grav.25:145002,2008
10.1088/0264-9381/25/14/145002
AEI-2007-177
gr-qc
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We discuss a gauge choice which allows us to avoid the introduction of artificial timelike outer boundaries in numerical studies of test fields based on a 3+1 decomposition of asymptotically flat background spacetimes. The main idea is to include null infinity in the computational domain by conformally compactifying the metric on hyperboloidal foliations and fixing the spatial coordinate location of null infinity, i.e. scri-fixing. We construct such coordinates explicitly on Minkowski, Schwarzschild and Kerr spacetimes.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 14:03:57 GMT" }, { "version": "v2", "created": "Tue, 24 Jun 2008 17:31:59 GMT" } ]
2008-11-26T00:00:00
[ [ "Zenginoğlu", "Anıl", "" ] ]
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712.4334
Fabien Durand
Maria Isabel Cortez, Fabien Durand (LAMFA)
Self-similar tiling systems, topological factors and stretching factors
null
null
null
null
math.DS
null
In this paper we prove that if two self-similar tiling systems, with respective stretching factors $\lambda_1$ and $\lambda_2$, have a common factor which is a non periodic tiling system, then $\lambda_1$ and $\lambda_2$ are multiplicatively dependent.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 11:23:47 GMT" } ]
2007-12-31T00:00:00
[ [ "Cortez", "Maria Isabel", "", "LAMFA" ], [ "Durand", "Fabien", "", "LAMFA" ] ]
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712.4335
Volker Ossenkopf
Volker Ossenkopf
The stability of spectroscopic instruments: A unified Allan variance computation scheme
accepted for publication in Astronomy & Astrophysics
null
10.1051/0004-6361:20079188
null
astro-ph
null
The Allan variance is a standard technique to characterise the stability of spectroscopic instruments used in astronomical observations. The period for switching between source and reference measurement is often derived from the Allan minimum time. We propose a new approach for the computation of the Allan variance of spectrometer data combining the advantages of the two existing methods into a unified scheme. Using the Allan variance spectrum we derive the optimum strategy for symmetric observing schemes minimising the total uncertainty of the data resulting from radiometric and drift noise. The unified Allan variance computation scheme is designed to trace total-power and spectroscopic fluctuations within the same framework. The method includes an explicit error estimate both for the individual Allan variance spectra and for the derived stability time. A new definition of the instrument stability time allows to characterise the instrument even in the case of a fluctuation spectrum shallower than 1/f, as measured for the total power fluctuations in high-electron-mobility transistors. We find a non-linear impact of the binning of spectrometer channels on the resulting noise and the Allan time deviating from the description in existing theoretical treatments.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 11:24:16 GMT" } ]
2009-11-13T00:00:00
[ [ "Ossenkopf", "Volker", "" ] ]
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712.4336
Viacheslav Shtyk
V.I. Gerasimenko, V.O. Shtyk
The von Neumann Hierarchy for Correlation Operators of Quantum Many-Particle Systems
26 pages
J. Stat. Mech. (2008) P03007
10.1088/1742-5468/2008/03/P03007
null
math-ph math.AP math.MP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The Cauchy problem for the von Neumann hierarchy of nonlinear equations is investigated. One describes the evolution of all possible states of quantum many-particle systems by the correlation operators. A solution of such nonlinear equations is constructed in the form of an expansion over particle clusters whose evolution is described by the corresponding order cumulant (semi-invariant) of evolution operators for the von Neumann equations. For the initial data from the space of sequences of trace class operators the existence of a strong and a weak solution of the Cauchy problem is proved. We discuss the relationships of this solution both with the $s$-particle statistical operators, which are solutions of the BBGKY hierarchy, and with the $s$-particle correlation operators of quantum systems.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 14:56:22 GMT" }, { "version": "v2", "created": "Thu, 5 Jun 2008 11:37:17 GMT" } ]
2010-04-27T00:00:00
[ [ "Gerasimenko", "V. I.", "" ], [ "Shtyk", "V. O.", "" ] ]
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712.4337
Fabien Durand
Fabien Durand (LAMFA)
Cobham-Semenov theorem and $\NN^d$-subshifts
24 pages
null
null
null
math.DS math.CO
null
We give a new proof of the Cobham's first theorem using ideas from symbolic dynamics and of the Cobham-Semenov theorem (in the primitive case) using ideas from tiling dynamics.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 11:26:03 GMT" } ]
2007-12-31T00:00:00
[ [ "Durand", "Fabien", "", "LAMFA" ] ]
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712.4338
A. Sherman
A. Sherman and M. Schreiber
Fluctuating charge density waves in the Hubbard model
8 pages, 4 figures
Phys. Rev. B 77, 155117 (2008)
10.1103/PhysRevB.77.155117
null
cond-mat.str-el
null
The charge susceptibility of the two-dimensional repulsive Hubbard model is investigated using the diagram technique developed for the case of strong correlations. In this technique, a power series in the hopping constant is used. It is shown that once the Fermi level crosses one of the Hubbard subbands a sharp peak appears in the momentum dependence of the static susceptibility. With further departure from half-filling the peak transforms to a ridge around the $\Gamma$ point. In the considered range $0\leq|1-\bar{n}|\alt 0.2$ of the electron filling $\bar{n}$ the static susceptibility is finite which points to the absence of the long-range charge ordering. However, for $|1-\bar{n}|\approx 0.12$ the susceptibility maxima are located halfway between the center and the boundaries of the Brillouin zone. In this case an interaction of carriers with tetragonal distortions can stabilize the charge density wave with the wavelength of four lattice spacings, as observed experimentally in the low-temperature tetragonal phase of lanthanum cuprates. In the range of parameters inherent in cuprate perovskites the character of the susceptibility evolution with $\bar{n}$ depends only weakly on the ratio of the nearest-neighbor hopping constant to the Hubbard repulsion and on details of the initial band structure. The location of the susceptibility maxima in the Brillouin zone is mainly determined by the value of $\bar{n}$.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 11:36:38 GMT" }, { "version": "v2", "created": "Sun, 9 Mar 2008 08:56:42 GMT" } ]
2009-11-13T00:00:00
[ [ "Sherman", "A.", "" ], [ "Schreiber", "M.", "" ] ]
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712.4339
Sergey Simakov S
A.S. Kholodov, S.S. Simakov, Y.A. Kholodov, A.A. Nadolsky, A.N. Shushlebin
Global dynamical model of the cardiovascular system
null
Proceedings of the III European Conference on Computational Mechanics, eds. C.A. Mota Soares et. al. 2006, pp. 1467.1-1467.9
null
null
physics.bio-ph physics.med-ph q-bio.TO
null
Blood system functions are very diverse and important for most processes in human organism. One of its primary functions is matter transport among different parts of the organism including tissue supplying with oxygen, carbon dioxide excretion, drug propagation etc. Forecasting of these processes under normal conditions and in the presence of different pathologies like atherosclerosis, loss of blood, anatomical abnormalities, pathological changing in chemical transformations and others is significant issue for many physiologists. In this connection should be pointed out that global processes are of special interest as they include feedbacks and interdependences among different regions of the organism. Thus the main goal of this work is to develop the model allowing to describe effectively blood flow in the whole organism. As we interested in global processes the models of the four vascular trees (arterial and venous parts of systemic and pulmonary circulation) must be closed with heart and peripheral circulation models. As one of the model applications the processes of the blood loss is considered in the end of the paper.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 11:38:10 GMT" } ]
2007-12-31T00:00:00
[ [ "Kholodov", "A. S.", "" ], [ "Simakov", "S. S.", "" ], [ "Kholodov", "Y. A.", "" ], [ "Nadolsky", "A. A.", "" ], [ "Shushlebin", "A. N.", "" ] ]
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712.434
Michael Kunzinger
Michael Kunzinger
Recent Progress in Special Colombeau Algebras: Geometry, Topology, and Algebra
12 pages, contribution for conference "Generalized Functions 2007", Banach Center, Bedlewo, Poland
null
null
null
math.FA math.AC
null
Over the past few years there has been considerable progress in the structural understanding of special Colombeau algebras. We present some of the main trends in this development: non-smooth differential geometry, locally convex theory of modules over the ring of generalized numbers, and algebraic aspects of Colombeau theory. Some open problems are given and directions of further research are outlined.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 11:47:33 GMT" } ]
2007-12-31T00:00:00
[ [ "Kunzinger", "Michael", "" ] ]
[ 0.0809380487, 0.0259708501, 0.0557175204, 0.0379760154, 0.0580895059, 0.0191211291, 0.0563468225, -0.085682027, -0.0295530371, -0.0313199274, 0.0218924824, -0.1195675731, -0.1151140407, -0.0035882373, 0.11714717, 0.0662704483, 0.0155873513, 0.0205854699, 0.1697181761, 0.0978324115, 0.0318040065, -0.0586704016, -0.021069549, 0.019351067, -0.0090825362, -0.0203797352, -0.0052855401, 0.112984091, 0.0458180979, -0.0610907972, 0.0684003979, -0.0410741232, -0.021069549, 0.0631723404, -0.1572289318, 0.0720309913, 0.0049799653, 0.0954604223, 0.0110067511, 0.0675774589, 0.0881992355, 0.0992362425, -0.0209969357, -0.0036094158, 0.0737736747, -0.0035247018, -0.0160714313, 0.0383148715, -0.0649634302, 0.0367174111, 0.0274230875, 0.0803087428, 0.0861176923, -0.0735800415, -0.0684488043, 0.0106860492, -0.1067878753, -0.0468104631, 0.0065592737, -0.03153776, 0.0137236463, -0.1198580191, 0.0386295207, 0.0116057992, -0.1078528538, -0.0398155153, -0.0988973901, 0.0301097278, -0.0072067296, 0.0118478388, -0.010607386, 0.0496181212, 0.0559111498, 0.1112414077, -0.0324575119, -0.0090704346, -0.0039270925, 0.1487091333, -0.0096452786, -0.0485289432, -0.1173408031, 0.0231268853, 0.0804539695, -0.0144255608, 0.062591441, 0.0008229347, 0.0628334805, 0.0725634769, -0.0269632135, 0.0081022764, 0.0048619709, -0.0340065658, -0.0040178578, 0.0408078805, 0.1651678383, -0.002493008, 0.0765329227, 0.0619621426, -0.0211905688, 0.1407702416, -0.0294562206, -0.0044928603, 0.0894578397, -0.0611876138, 0.2077668011, 0.0402995944, 0.0774042681, -0.0492792651, -0.0597353764, -0.0765329227, -0.1157917529, -0.0599774159, -0.0627850741, 0.0604130886, 0.0024491383, -0.0858272463, -0.0770170018, 0.0247485507, 0.0583315454, -0.016398184, -0.1411575079, 0.0089615164, -0.0172332209, -0.002086079, 0.0616716929, -0.0240950435, 0.0003174879, -0.0420422815, -0.0282702278, -0.0437365584, 0.0881024227, -0.0378307924, 0.0515544377, -0.0385085009, -0.0924107283, -0.0320944525, 0.0196294133, 0.0019453934, 0.0560563765, 0.0064382539, 0.0856336132, -0.0339339525, 0.0945890844, 0.0086226612, 0.056104783, 0.0255109761, -0.0720793977, 0.0957992822, 0.0410741232, 0.0175841786, -0.0547493622, -0.0229816623, 0.0128765078, 0.0563468225, -0.0863113254, -0.0784692466, -0.0107284058, 0.0052159536, 0.0506830961, 0.0532971248, 0.0166644268, 0.1305077672, -0.083794117, -0.0182376858, 0.0109885987, 0.022933254, -0.1143395156, 0.0531034917, -0.0591544807, -0.065592736, 0.0419696681, -0.0499085672, -0.0973967388, 0.0148370285, -0.0770654157, -0.0483837202, -0.0245912243, -0.1053356379, -0.0849559084, -0.0365479812, -0.0305453986, 0.0343696252, 0.021844076, 0.056104783, -0.1216975152, 0.0233326182, 0.0212631803, 0.0155147389, -0.0320460461, 0.0603646785, -0.0151879862, -0.0325301252, 0.0645277649, 0.09700948, 0.0189032946, -0.1561639607, -0.0154905356, 0.0766781494, -0.0380970351, -0.0598805994, 0.001372062, -0.021214772, 0.0353377834, -0.0251237117, -0.0265517458, -0.0095545137, 0.0516996607, -0.0017820167, -0.0677226856, -0.0561531894, 0.0053097443, 0.0004507988, 0.0715953186, 0.1046579331, 0.0025928493, -0.0434945188, -0.1079496667, 0.0023462714, -0.0201982055, 0.0840361565, -0.0218198709, 0.1017534509, 0.0255835876, 0.013130649, 0.062591441, 0.0608487576, 0.0164707955, -0.0456728749, 0.0406142473, -0.0037243846, 0.1097891703, -0.0360639021, -0.0288511217, -0.0415824056, -0.0167007335, -0.0284154508, -0.0013085266, 0.0016640223, -0.0092519643, -0.006335387, 0.0052704127, -0.0333046503, 0.0323122889, 0.1312822849, -0.115501307, 0.0605099052, -0.0637532324, -0.0082717035, 0.0054821973, 0.0229211524, 0.0025913366, 0.0324575119, 0.1018502712, -0.0539748333, 0.0193752721, 0.0784208328 ]
712.4341
Yongming Li
Yongming Li
Finite Automata Based on Quantum Logic and Their Determinization
null
null
null
null
cs.LO
null
We give the quantum subset construction of orthomodular lattice-valued finite automata, then we show the equivalence between orthomodular lattice-valued finite automata, orthomodular lattice-valued deterministic finite automata and orthomodular lattice-valued finite automata with empty string-moves. Based on these equivalences, we study the algebraic operations on orthomodular lattice-valued regular languages, then we establish Kleene theorem in the frame of quantum logic.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 11:48:44 GMT" } ]
2007-12-31T00:00:00
[ [ "Li", "Yongming", "" ] ]
[ -0.0332792401, 0.0552210622, -0.1234410629, 0.0083747869, -0.0079349736, 0.010702135, -0.098078467, 0.0236888584, -0.1390788853, 0.0844931081, 0.0383126661, -0.0722760633, -0.076185517, 0.015576737, 0.0845419765, -0.013988521, 0.0559540838, 0.0063406485, 0.0835157484, 0.0643105432, 0.0096514681, -0.0966124237, 0.0836134851, -0.0553187989, -0.0630399734, -0.0089062285, 0.0349407606, 0.0255336314, 0.0851772651, -0.1216818094, 0.0733511597, -0.04806187, -0.034085568, -0.0234445166, -0.0477930941, 0.0567359738, -0.0137075288, 0.0134021025, -0.1049688831, 0.0104822284, -0.0665096119, -0.0891355872, -0.0078372369, -0.0144527685, 0.0970522389, 0.0614273213, 0.0035857039, 0.1212908626, -0.0721294582, -0.0002878642, -0.0662164018, 0.0311290398, -0.0157599933, -0.0513116047, -0.0207567662, -0.0662164018, -0.0514582098, 0.0417578742, 0.0713964328, -0.0582020208, 0.0426375009, -0.0970522389, 0.0142328618, 0.1165995151, -0.1025254726, 0.0457406305, -0.1675201803, -0.001827976, 0.0252648573, 0.0527287833, -0.0797040239, 0.0531197302, 0.1390788853, 0.106043987, 0.0538038835, -0.0703213364, -0.0332059376, 0.0750126764, 0.050431978, 0.0302738473, 0.0195472781, 0.0086557791, 0.0990069658, -0.1592125744, -0.0115145687, 0.0642128065, -0.0263888258, 0.0048043546, -0.078286849, -0.065092437, 0.0561006889, 0.0218563005, 0.0023380378, -0.0025625259, 0.0809257329, 0.0201825649, 0.0866921768, 0.0147337606, -0.0046608043, -0.0946576968, -0.0903084278, -0.1249071062, 0.0801927075, -0.0344032086, 0.0728624761, -0.000701335, 0.0201581307, 0.0020371929, -0.0806325227, -0.0354294404, -0.08503066, -0.0916767344, -0.0793619528, 0.0102867549, 0.0218074322, -0.0256313682, -0.0053999354, 0.0294675212, 0.0243852288, 0.045032043, -0.0726181418, -0.0532663316, 0.0950975046, -0.0529242568, 0.0554165319, 0.0344276428, -0.0168106593, -0.1191406623, -0.0517025515, 0.0509695262, 0.139176622, 0.0168717448, 0.0092177633, -0.045398552, -0.0604010895, -0.0709077492, 0.0221861601, -0.0101279337, 0.0308113974, -0.0170794334, 0.1138628945, -0.0974920467, 0.0531197302, 0.0853727385, -0.0942667499, 0.0214042701, -0.0109342588, -0.0552210622, -0.0289544053, 0.0187776033, -0.0002464408, -0.1506117731, 0.1031118929, 0.0797040239, 0.0683177337, -0.1453340203, -0.0729113445, 0.0398520119, 0.0673892424, 0.0054701837, 0.0742307901, 0.0142206447, 0.0077578262, 0.0284168553, 0.0895265341, 0.0042087734, -0.0628444999, -0.0191074647, -0.066656217, -0.0656299889, -0.0149536682, -0.0067377025, -0.0148803657, -0.0655322522, -0.0132188471, 0.0323018767, -0.0876206756, -0.1186519787, -0.0292476155, -0.0101829106, 0.0683666021, 0.0019180767, -0.0752570182, -0.0252648573, 0.0219906885, -0.0435415618, 0.0415868349, 0.0807302594, 0.0829781964, -0.015711125, -0.0171649531, 0.0595214628, 0.0413913615, 0.0746706054, 0.1323350668, -0.0922631547, 0.0477197915, 0.0659720674, 0.0750615448, -0.1049688831, 0.1057507768, 0.0478908308, 0.0765764639, -0.0450564772, 0.0037292542, 0.052142363, 0.0597658046, -0.0598146729, -0.0687086806, -0.0082770502, 0.008979531, -0.0315199867, 0.0628444999, -0.0003878913, 0.0142817302, 0.0701747313, -0.0015523288, 0.0089489883, -0.0216852613, 0.028514592, -0.0062978887, 0.0220273398, 0.0630888417, -0.0370176584, -0.0828315914, 0.0727158785, -0.0141229089, 0.0145138539, -0.0260223132, -0.0388990827, 0.0207812004, -0.0698815212, -0.0614761896, -0.0354538746, -0.0191563331, 0.0011613832, 0.0349163264, -0.1335079074, -0.068024531, -0.0424420275, 0.0599124059, 0.0648480952, 0.0400719196, -0.000486773, 0.0548301153, -0.0459605381, -0.0336213186, 0.0712009594, 0.0347941555, -0.0473777167, -0.0180812329, 0.0664607435, 0.0331082009, 0.0414890982, -0.0546346419, 0.0539504886 ]
712.4342
Sergey Simakov S
S.S. Simakov, A.S. Kholodov, A.V. Evdokimov, Y.A. Kholodov
Numerical simulations of cardiovascular diseases and global matter transport
null
AITTH: Proceedings of the International Conf. - Minsk: United Institute of Informatics Problems of the NAS of Belarus, 2005. - eds. S. Ablameyko, et. al., Vol. 2, pp. 188-192
null
null
physics.bio-ph physics.med-ph q-bio.TO
null
Numerical model of the peripheral circulation and dynamical model of the large vessels and the heart are discussed in this paper. They combined together into the global model of blood circulation. Some results of numerical simulations concerning matter transport through the human organism and heart diseases are represented in the end.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 11:53:21 GMT" } ]
2007-12-31T00:00:00
[ [ "Simakov", "S. S.", "" ], [ "Kholodov", "A. S.", "" ], [ "Evdokimov", "A. V.", "" ], [ "Kholodov", "Y. A.", "" ] ]
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712.4343
Lara Silvers
L. J. Silvers
Long-term Nonlinear Behaviour of the Magnetorotational Instability in a Localised Model of an Accretion Disc
10 pages, 10 figures, 2 tables, accepted by MNRAS
null
10.1111/j.1365-2966.2008.12906.x
null
astro-ph
null
For more than a decade, the so-called shearing box model has been used to study the fundamental local dynamics of accretion discs. This approach has proved to be very useful because it allows high resolution and long term studies to be carried out, studies that would not be possible for a global disc. Localised disc studies have largely focused on examining the rate of enhanced transport of angular momentum, essentially a sum of the Reynolds and Maxwell stresses. The dominant radial-azimuthal component of this stress tensor is, in the classic Shakura-Sunayaev model, expressed as a constant alpha times the pressure. Previous studies have estimated alpha based on a modest number of orbital times. Here we use much longer baselines, and perform a cumulative average for alpha. Great care must be exercised when trying to extract numerical alpha values from simulations: dissipation scales, computational box aspect ratio, and even numerical algorithms all affect the result. This study suggests that estimating alpha becomes more, not less, difficult as computational power increases.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 13:44:04 GMT" } ]
2009-11-13T00:00:00
[ [ "Silvers", "L. J.", "" ] ]
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712.4344
Rodion Stepanov
A. Chupin and R. Stepanov
Full perturbation solution for the flow in a rotated torus
4 pages, 6 figures
null
10.1103/PhysRevE.77.057301
null
physics.flu-dyn
null
We present a perturbation solution for a pressure-driven fluid flow in a rotating toroidal channel. The analysis shows the difference between the solutions of full and simplified equations studied earlier. The result is found to be reliable for {\it low} Reynolds number ($\R$) as was the case for a previously studied solution for high $\R$. The convergence conditions are defined for the whole range of governing parameters. The viscous flow exhibits some interesting features in flow pattern and hydrodynamic characteristics.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 12:36:00 GMT" }, { "version": "v2", "created": "Mon, 25 Feb 2008 18:22:04 GMT" } ]
2009-11-13T00:00:00
[ [ "Chupin", "A.", "" ], [ "Stepanov", "R.", "" ] ]
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712.4345
Palash Baran Pal
Jos\'e F. Nieves, Palash B. Pal
Lorentz-symmetry violating decays in a medium
16 pages, Latex, no figures
Phys.Rev.D77:113001,2008
10.1103/PhysRevD.77.113001
null
hep-ph
null
Various decay processes, such as the decay of a spin-1 particle into two photons or the gravitational decay of a spin-1/2 fermion, are forbidden in the vacuum by a combination of requirements, including angular momentum conservation, Lorentz invariance and gauge invariance. We show that such processes can occur in a medium, such as a thermal background of particles, even if it is homogeneous and isotropic. We carry out a model-independent analysis of the vertex function for such processes in terms of a set of form factors, and show that the amplitude can be non-zero while remaining consistent with the symmetry principles mentioned above. The results simulate Lorentz symmetry violating effects, although in this case they arise from completely Lorentz-invariant physics.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 12:36:15 GMT" } ]
2008-11-26T00:00:00
[ [ "Nieves", "José F.", "" ], [ "Pal", "Palash B.", "" ] ]
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712.4346
Richard Pincak
M. Pudlak, R. Pincak
Electronic properties of double-layer carbon nanotubes
26 pages, 10 figures. European Physical Journal B, in press, Condensed Matter - Mesoscopic and Nanoscale Systems
null
10.1088/1742-6596/129/1/012011
null
cond-mat.mtrl-sci cond-mat.other
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The electronic spectra for double-wall zigzag and armchair nanotubes are found. The influence of nanotube curvatures on the electronic spectra is also calculated. Our finding that the outer shell is hole doped by the inner shell is in the difference between Fermi levels of individual shells which originate from the different hybridization of pi-orbital. The shift and rotation of the inner nanotube with respect to the outer nanotube are investigated. We found stable semimetal characteristics of the armchair DWNTs in regard of the shift and rotation of the inner nanotube. We predict the shift of k_F towards the bigger wave vectors with decreasing of the radius of the armchair nanotube.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 12:58:04 GMT" }, { "version": "v2", "created": "Thu, 24 Jul 2008 11:56:46 GMT" }, { "version": "v3", "created": "Tue, 20 Jan 2009 13:37:22 GMT" } ]
2009-11-13T00:00:00
[ [ "Pudlak", "M.", "" ], [ "Pincak", "R.", "" ] ]
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712.4347
Debades Bandyopadhyay
Debarati Chatterjee and Debades Bandyopadhyay
Role of antikaon condensation in r-mode instability
LaTeX; 11 pages; 5 figures; published in the proceedings of the workshop on Physics and Astrophysics of Hadronic Matter (held in Santiniketan, India, 6-11 November, 2006), Ed. A.B. Santra, Narosa Publishing House, India
null
null
null
astro-ph
null
We investigate the effect of antikaon condensed matter on bulk viscosity in rotating neutron stars. We use relativistic field theoretical models to construct the equation of state of neutron stars with the condensate, where the phase transition from nucleonic to $K^-$ condensed phase is assumed to be of first order. We calculate the coefficient of bulk viscosity due to the non-leptonic weak interaction n --> p + K^-. The influence of antikaon bulk viscosity on the gravitational radiation reaction driven instability in the r-modes is investigated. We compare our results with the previously studied non-leptonic weak interaction $n + p --> p + \Lambda$ involving hyperons on the damping of the r-mode oscillations. We find that the bulk viscosity coefficient due to the non-leptonic weak process involving the condensate is suppressed by several orders of magnitude in comparison with the non-superfluid hyperon bulk viscosity coefficient. Consequently, the antikaon bulk viscosity may not be able to damp the r-mode instability, while hyperon bulk viscosity can effectively suppress r-mode oscillations at low temperatures. Hence neutron stars containing $K^-$ condensate in their core could be possible sources of gravitational waves.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 13:27:07 GMT" } ]
2007-12-31T00:00:00
[ [ "Chatterjee", "Debarati", "" ], [ "Bandyopadhyay", "Debades", "" ] ]
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712.4348
Akihiro Ishibashi
Akihiro Ishibashi
Higher Dimensional Bondi Energy with a Globally Specified Background Structure
23 pages, no figures, references are added, minor corrections, numerous minor revisions, to appear in Class. Quantum Grav
Class.Quant.Grav.25:165004,2008
10.1088/0264-9381/25/16/165004
KEK-Cosmo-3, KEK/TH/1213
gr-qc hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A higher (even spacetime) dimensional generalization of the Bondi energy has recently been proposed by gr-qc/0304054 within the framework of conformal infinity and Hamiltonian formalizm. The gauge condition employed in gr-qc/0304054 to derive the Bondi energy expression is, however, peculiar in the sense that cross-sections of null infinity specified by that gauge are anisotropic and in fact non-compact. For this reason, that gauge is difficult to use for explicit computations of the Bondi energy in general, asymptotically flat radiative spacetimes. Also it is not clear, under that gauge condition, whether apparent difference between the expressions of higher dimensional Bondi energy and the 4-dimensional one is due to the choice of gauges or qualitatively different nature of higher dimensional gravity from 4-dimensional gravity. In this paper, we consider instead, Gaussian null conformal gauge as one of more natural gauge conditions that admit a global specification of background structure with compact, spherical cross-sections of null infinity. Accordingly, we modify the previous definition of higher dimensional news tensor so that it becomes well-defined in the Gaussian null conformal gauge and derive, for vacuum solutions, the expression for the Bondi energy-momentum in the new gauge choice, which takes a universal form in arbitrary (even spacetime) dimensions greater than or equal to four.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 13:13:22 GMT" }, { "version": "v2", "created": "Tue, 1 Apr 2008 11:02:15 GMT" }, { "version": "v3", "created": "Sun, 22 Jun 2008 22:34:40 GMT" } ]
2009-11-13T00:00:00
[ [ "Ishibashi", "Akihiro", "" ] ]
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712.4349
Dmitri Khveshchenko
R. H. Crooks and D. V. Khveshchenko
Entanglement propagation through spin chains in the presence of a staggered magnetic field
Latex, 4+ pages
Phy. Rev. A77, 062305 (2008)
10.1103/PhysRevA.77.062305
null
cond-mat.str-el quant-ph
null
We study the dynamics of entanglement in the XY spin chain subject to a staggered magnetic field and contrast it to the previously studied uniform field case. We find that, depending on parameter values, a staggered field can provide better conditions for a perfect entanglement transfer, while even a modest amount of exchange anisotropy appears to have a strong detrimental effect. We also study interactions between different waves of entanglement and assess the possibility of simultaneous transmission of multiple bits of quantum information.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 15:09:05 GMT" } ]
2009-11-13T00:00:00
[ [ "Crooks", "R. H.", "" ], [ "Khveshchenko", "D. V.", "" ] ]
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712.435
A. J. Blustin
A. J. Blustin (UCL-MSSL)
Publication and citation statistics for UK astronomers
10 pages, 3 figures, added bibliography
Astron.Geophys.48:632-635,2007
10.1111/j.1468-4004.2007.48632.x
null
astro-ph
null
This article presents a survey of publication and citation statistics for 835 UK professional astronomers: the majority of academics and contract researchers within the UK astronomical community. I provide histograms of these bibliometrics for the whole sample as well as of the median values for the individual departments. I discuss the distribution of top bibliometric performers in the sample, and make some remarks on the usage of bibliometrics in a real-world assessment exercise.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 13:31:53 GMT" } ]
2009-06-25T00:00:00
[ [ "Blustin", "A. J.", "", "UCL-MSSL" ] ]
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712.4351
Carlos P. Herrero
Carlos P. Herrero and Rafael Ramirez
Diffusion of muonium and hydrogen in diamond
4 pages, 3 figures
Phys. Rev. Lett. 99, 205504 (2007)
10.1103/PhysRevLett.99.205504
null
cond-mat.mtrl-sci
null
Jump rates of muonium and hydrogen in diamond are calculated by quantum transition-state theory, based on the path-integral centroid formalism. This technique allows us to study the influence of vibrational mode quantization on the effective free-energy barriers Delta F for impurity diffusion, which are renormalized respect to the zero-temperature classical calculation. For the transition from a tetrahedral (T) site to a bond-center (BC) position, Delta F is larger for hydrogen than for muonium, and the opposite happens for the transition from BC to T. The calculated effective barriers decrease for rising temperature, except for the muonium transition from T to BC sites. Calculated jump rates are in good agreement to available muon spin rotation data.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 13:39:51 GMT" } ]
2009-11-13T00:00:00
[ [ "Herrero", "Carlos P.", "" ], [ "Ramirez", "Rafael", "" ] ]
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712.4352
Carlo Burigana Dr.
Carlo Burigana
Sunyaev-Zeldovich and Cosmic Microwave Background
21 pages. Invited Lecture at the First MCCT-SKADS Training School, September 23-29, 2007, Medicina, Bologna, Italy. PoS(MCCT-SKADS)013
PoS MCCT-SKADS:013,2007
null
null
astro-ph
null
Since its original formulation the Sunyaev-Zeldovich (SZ) effect has been recognized as a ``powerful laboratory'' for our comprehension of physical processes in cosmic structures and to derive crucial information on some general properties of the universe. After a discussion of the fundamental concepts and of some well established applications of the SZ effect towards galaxy clusters, I will focus on dedicated themes related to the SZ effect and other features in the cosmic microwave background (CMB) of particular interest in the view of the extremely high angular resolution observations achievable in the future with the Square Kilometre Array (SKA). SKA will allow the mapping of the thermal and density structure of clusters of galaxies at radio and centimetre bands with unprecedented resolution and sensitivity and with an extremely accurate control of extragalactic radio source contamination. The signatures from SZ effects and free-free emission at galactic scales and in the intergalactic medium probe the structure evolution at various cosmic times. The detection of these sources and their imaging at the high resolution and sensitivity achievable with SKA will greatly contribute to the comprehension of crucial cosmological and astrophysical aspects, as the physical conditions of early ionized halos, quasars and proto-galactic gas. The spectacular improvement in our understanding of the properties of extragalactic radio sources at very faint fluxes achievable with SKA will allow to accurately model their contribution to the diffuse radio background, greatly contributing to the interpretation of next generation of CMB spectrum experiments devoted to probe the thermal plasma history at early times.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 15:09:50 GMT" } ]
2009-06-23T00:00:00
[ [ "Burigana", "Carlo", "" ] ]
[ 0.0417904183, 0.044451423, -0.0227198973, 0.0490638278, -0.1006619409, 0.0084265098, 0.0210345965, 0.0203630086, -0.0838342682, 0.0065511363, 0.0335793234, -0.046073366, -0.1045140624, 0.0232647695, 0.0375328138, 0.051344689, -0.109379895, 0.0939714238, 0.0952385664, -0.0024360849, -0.0342889242, -0.0328950658, -0.0633572191, 0.0588968694, -0.1027907431, -0.0529666319, -0.010251198, 0.0668038502, 0.0535241775, -0.0508378297, -0.0241137557, -0.0748122036, -0.1408050805, -0.0721765384, -0.0507364571, 0.1315802634, -0.069439508, 0.0215287823, -0.0455411673, -0.1058318913, 0.0218075532, 0.0054645599, -0.0566666946, 0.0140272873, -0.007628209, -0.0660942495, -0.0872808993, -0.087737076, -0.0310957208, -0.0112649128, -0.0286121182, 0.0563118942, 0.0348464698, -0.0660435632, -0.1091771573, -0.0302087199, -0.0248867143, 0.0402191617, -0.0633572191, 0.0151297031, -0.0263819452, -0.0219469387, 0.0235055275, 0.0252161715, -0.084138386, -0.004849995, 0.1021318287, 0.0336553529, 0.0322614945, 0.0342382379, 0.0589982383, -0.0638640746, 0.0185003076, 0.0376848727, 0.058947552, -0.0685778484, 0.0396616161, 0.0538789779, 0.0381917283, 0.0123609928, -0.0259004291, -0.0838342682, 0.0331484936, -0.0216428246, -0.0257863868, 0.0415369906, -0.0454397947, 0.0517755151, -0.0573762953, 0.1016249731, -0.007216387, -0.02678743, -0.0285107475, -0.0603667535, 0.0972153097, -0.0217061825, 0.0625969321, -0.0265340023, 0.12600483, 0.0668038502, 0.0807424337, 0.0482781976, 0.0321601219, -0.0877877548, 0.064928472, -0.032920409, -0.0099850968, -0.0556529798, 0.0424239933, -0.019767452, -0.057021495, -0.0400417596, 0.0079893451, 0.0820602626, -0.0931604505, -0.0352772959, -0.12124037, -0.060164012, -0.0002686742, 0.070351854, -0.0066905222, 0.0486583412, 0.064168185, 0.0975701138, 0.0417650752, -0.115056701, 0.099850975, -0.0459973402, -0.0596064702, 0.0532200597, 0.1008139998, 0.0015395803, -0.0337060392, -0.054487206, -0.061380472, -0.0324895792, -0.0281052608, -0.0857096389, 0.0019989202, -0.0280038901, 0.0263566021, 0.050432343, 0.0761807188, 0.0447808802, 0.0465295389, 0.0387239307, -0.0534228049, -0.0162067749, 0.02678743, 0.049089171, -0.0226311982, -0.0887001008, -0.002455092, -0.0815027207, 0.0688819662, -0.0291950051, 0.0590996109, 0.0484809428, -0.0539803468, -0.0309690069, 0.0593023524, 0.000067416, -0.0638640746, 0.043412365, -0.0381157026, 0.0150536746, -0.0888014734, 0.0050400663, -0.1049195528, -0.1312761456, -0.0582379512, -0.004821484, -0.0590489246, -0.0653339624, 0.005505742, 0.1643232703, 0.0430068783, -0.1120155603, 0.0370766409, -0.0152944317, 0.0210219249, 0.0170304198, 0.0964043364, -0.0459213108, 0.0139766019, 0.0744067132, -0.0318560079, 0.0372033566, -0.0239743702, -0.0508378297, -0.0711628273, 0.0564132631, -0.0140146157, 0.1457722783, 0.0030300589, -0.0709600821, 0.0088003175, 0.0806917474, -0.101016745, 0.0524597764, 0.1344186664, -0.0169670619, 0.0733423159, -0.0400671028, -0.0428041331, -0.1224568263, 0.1554025859, 0.0491145141, -0.0481007993, 0.0231887419, 0.0549940616, -0.0601133257, 0.107048355, 0.0489624552, -0.1224568263, -0.035936214, -0.0938700512, 0.0526625179, 0.0323121808, 0.0165108908, -0.1091771573, 0.0995468572, 0.1484079361, 0.1068456098, 0.0631544739, 0.0289922617, 0.0569708087, -0.0020226792, 0.0798300952, 0.0313744918, -0.0372540429, 0.0698956773, -0.0050464021, 0.0968605131, -0.0449329391, -0.030690236, 0.0197167657, 0.0041023795, 0.0177400205, -0.0882946178, 0.0370513014, 0.0282066315, -0.0543351471, 0.0989893153, 0.0117590996, 0.0699463636, 0.0018120164, -0.0396109298, 0.0805903748, -0.0489877984, 0.1191115677, 0.025292201, -0.077549234, -0.0367218405, 0.0174105633, -0.0008046366 ]
712.4353
Manuel Asorey
M. Asorey, J. Clemente-Gallardo and J.M. Munoz-Castaneda
Boundary conditions: The path integral approach
8 pages
J.Phys.Conf.Ser.87:012004,2007
10.1088/1742-6596/87/1/012004
null
quant-ph
null
The path integral approach to quantum mechanics requires a substantial generalisation to describe the dynamics of systems confined to bounded domains. Non-local boundary conditions can be introduced in Feynman's approach by means of boundary amplitude distributions and complex phases to describe the quantum dynamics in terms of the classical trajectories. The different prescriptions involve only trajectories reaching the boundary and correspond to different choices of boundary conditions of selfadjoint extensions of the Hamiltonian. One dimensional particle dynamics is analysed in detail.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 13:52:23 GMT" } ]
2008-11-26T00:00:00
[ [ "Asorey", "M.", "" ], [ "Clemente-Gallardo", "J.", "" ], [ "Munoz-Castaneda", "J. M.", "" ] ]
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712.4354
Asit K. De
Asit K. De, A. Harindranath, Jyotirmoy Maiti
Investigation of Lattice QCD with Wilson fermions with Gaussian Smearing
25 pages, 19 figures
null
null
null
hep-lat
null
We present a detailed study of pion and rho mass, decay constants and quark mass in Lattice QCD with two flavors of dynamical quarks. We use Wilson gauge and fermion action at $\beta=5.6$ on $ 16^3 \times 32 $ lattice at eight values of the Wilson hopping parameter in the range 0.156 - 0.158. We perform a detailed investigation of the effect of gaussian smearing on both source and sink. We determine the optimum smearing parameter for various correlators for each value of the Wilson hopping parameter. The effects of smearing on observables are compared with those measured using local operators. We also investigate systematic effects in the extraction of masses and decay constants using different types of correlation functions for pion observables. We make interesting observations regarding chiral extrapolations and finite volume effects of different operators.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 13:55:17 GMT" } ]
2007-12-31T00:00:00
[ [ "De", "Asit K.", "" ], [ "Harindranath", "A.", "" ], [ "Maiti", "Jyotirmoy", "" ] ]
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712.4355
Toshimitsu Yamazaki
Toshimitsu Yamazaki
Interplay between Yukawa and Tomonaga in the Birth of Mesons
Invited tals at the Yukawa Centennial Session at INPC07, June, 2007, Tokyo. to be published in NPA. Nucl. Phys. A, in press
Nucl.Phys.A805:29-35,2008; Erratum-ibid.A808:220,2008
10.1016/j.nuclphysa.2008.02.228 10.1016/j.nuclphysa.2008.05.010
null
hep-ph
null
Light is shed on the early stage in the birth of Yukawa's meson theory, particularly on the interplay between Yukawa and Tomonaga in 1933. The discovery of the muon by Nishina' group in 1937 is also reviewed. It is pointed out that Heisenberg's attempt to explain the nuclear force in terms of the Heitler-London scheme, overcome by Yukawa and abandoned since then, is now being revived as a mechanism for a super strong nuclear force caused by a migrating real Kbar meson.
[ { "version": "v1", "created": "Thu, 27 Dec 2007 23:42:29 GMT" }, { "version": "v2", "created": "Wed, 19 Mar 2008 15:13:00 GMT" } ]
2008-11-26T00:00:00
[ [ "Yamazaki", "Toshimitsu", "" ] ]
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712.4356
Jungkai Alfred Chen
Jungkai Alfred Chen, Meng Chen
An optimal boundedness on weak $\bQ$-Fano threefolds
null
Advances in Mathematics 219 (2008), 2086-2104
null
null
math.AG
null
Let $X$ be a terminal weak $\bQ$-Fano threefold. We prove that $P_{-6}(X)>0$ and $P_{-8}(X)>1$. We also prove that the anti-canonical volume has a universal lower bound $-K_X^3 \geq 1/330$. This lower bound is optimal.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 14:00:17 GMT" }, { "version": "v2", "created": "Fri, 18 Jan 2008 02:33:10 GMT" } ]
2009-11-10T00:00:00
[ [ "Chen", "Jungkai Alfred", "" ], [ "Chen", "Meng", "" ] ]
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712.4357
Anna Karczewska
Anna Karczewska
Convolution type stochastic Volterra equations
Monograph, 101 pages
Lecture Notes in Nonlinear Analysis, Juliusz Schauder Center for Nonlinear Studies 10, Torun, 2007
null
null
math.PR
null
The aim of this work is to present, in self-contained form, results concerning fundamental and the most important questions related to linear stochastic Volterra equations of convolution type. The paper is devoted to study the existence and some kind of regularity of solutions to stochastic Volterra equations in Hilbert space and the space of tempered distributions, as well. In recent years the theory of Volterra equations, particularly fractional ones, has undergone a big development. This is an emerging area of research with interesting mathematical questions and various important applications. The increasing interest in these equations comes from their applications to problems from physics and engeenering, particularly from viscoelasticity, heat conduction in materials with memory or electrodynamics with memory.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 14:14:55 GMT" } ]
2007-12-31T00:00:00
[ [ "Karczewska", "Anna", "" ] ]
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712.4358
Lionel Levine
Lionel Levine
Limit Theorems for Internal Aggregation Models
Berkeley Ph.D. thesis
null
null
null
math.PR math.AP math.CO
null
We study the scaling limits of three different aggregation models on the integer lattice Z^d: internal DLA, in which particles perform random walks until reaching an unoccupied site; the rotor-router model, in which particles perform deterministic analogues of random walks; and the divisible sandpile, in which each site distributes its excess mass equally among its neighbors. As the lattice spacing tends to zero, all three models are found to have the same scaling limit, which we describe as the solution to a certain PDE free boundary problem in R^d. In particular, internal DLA has a deterministic scaling limit. We find that the scaling limits are quadrature domains, which have arisen independently in many fields such as potential theory and fluid dynamics. Our results apply both to the case of multiple point sources and to the Diaconis-Fulton smash sum of domains. In the special case when all particles start at a single site, we show that the scaling limit is a Euclidean ball in R^d, and give quantitative bounds on the rate of convergence to a ball. We also improve on the previously best known bounds of Le Borgne and Rossin in Z^2 and Fey and Redig in higher dimensions for the shape of the classical abelian sandpile model. Lastly, we study the sandpile group of a regular tree whose leaves are collapsed to a single sink vertex, and determine the decomposition of the full sandpile group as a product of cyclic groups. For the regular ternary tree of height n, for example, the sandpile group is isomorphic to (Z_3)^{2^{n-3}} x (Z_7)^{2^{n-4}} x ... x Z_{2^{n-1}-1} x Z_{2^n-1}. We use this result to prove that rotor-router aggregation on the regular tree yields a perfect ball.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 15:24:58 GMT" } ]
2007-12-31T00:00:00
[ [ "Levine", "Lionel", "" ] ]
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712.4359
James Silipo
Adelina Fabiano, Jacques Guenot, James Silipo
Bochner transforms, perturbations and amoebae of holomorphic almost periodic mappings in tube domains
null
Complex Var. Elliptic Eq. Vol. 52 No. 8, 2007, 709-739
10.1080/17476930701475094
null
math.CV
null
We give an alternative representation of the closure of the Bochner transform of a holomorphic almost periodic mapping in a tube domain. For such mappings we introduce a new notion of amoeba and we show that, for mappings which are regular in the sense of Ronkin, this new notion agrees with Favorov's one. We prove that the amoeba complement of a regular holomorphic almost periodic mapping, defined on Cn and taking its values in Cm+1, is a Henriques m-convex subset of Rn. Finally, we compare some different notions of regularity.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 14:14:33 GMT" } ]
2011-09-15T00:00:00
[ [ "Fabiano", "Adelina", "" ], [ "Guenot", "Jacques", "" ], [ "Silipo", "James", "" ] ]
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712.436
Karl Schlechta
Karl Schlechta (LIF)
Factorization (Splitting)
null
null
null
null
math.LO
null
We show some elementary facts about the semantical analogue of Parikh's Splitting, which we call Factorization.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 14:24:52 GMT" } ]
2007-12-31T00:00:00
[ [ "Schlechta", "Karl", "", "LIF" ] ]
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712.4361
Federico Rom\'a
D. H. Linares, F. Roma, A. J. Ramirez-Pastor
Entropy-driven phase transition in a system of long rods on a square lattice
14 pages, 6 figures. Accepted for publication in JSTAT
null
10.1088/1742-5468/2008/03/P03013
null
cond-mat.stat-mech cond-mat.dis-nn
null
The isotropic-nematic (I-N) phase transition in a system of long straight rigid rods of length k on square lattices is studied by combining Monte Carlo simulations and theoretical analysis. The process is analyzed by comparing the configurational entropy of the system with the corresponding to a fully aligned system, whose calculation reduces to the 1D case. The results obtained (1) allow to estimate the minimum value of k which leads to the formation of a nematic phase and provide an interesting interpretation of this critical value; (2) provide numerical evidence on the existence of a second phase transition (from a nematic to a non-nematic state) occurring at density close to 1 and (3) allow to test the predictions of the main theoretical models developed to treat the polymers adsorption problem.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 14:43:09 GMT" }, { "version": "v2", "created": "Mon, 10 Mar 2008 15:59:27 GMT" } ]
2009-11-13T00:00:00
[ [ "Linares", "D. H.", "" ], [ "Roma", "F.", "" ], [ "Ramirez-Pastor", "A. J.", "" ] ]
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712.4362
Lars Kadison
F. Castano Iglesias and Lars Kadison
Similarity, Codepth Two Bicomodules and QF Bimodules
11 pages
null
null
null
math.RA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
For any k-coalgebra C it is shown that similar quasi-finite C-comodules have strongly equivalent coendomorphism coalgebras; (the converse is in general not true). As an application we give a general result about codepth two coalgebra homomorphisms. Also a notion of codepth two bicomodule is introduced. The last section applies similarity to an endomorphism ring theorem for quasi-Frobenius (QF) bimodules and then to finite depth ring extensions. For QF extensions, we establish that left and right depth two are equivalent notions as well as a converse endomorphism theorem, and characterize depth three in terms of separability and depth two.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 15:14:38 GMT" }, { "version": "v2", "created": "Mon, 18 Aug 2008 16:26:45 GMT" } ]
2008-08-18T00:00:00
[ [ "Iglesias", "F. Castano", "" ], [ "Kadison", "Lars", "" ] ]
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712.4363
Andrzej Krolak
Robert J. Budzy\'nski, Witold Kondracki and Andrzej Kr\'olak
Applications of distance between probability distributions to gravitational wave data analysis
18 pages, 5 figures
Class.Quant.Grav.25:015005,2008
10.1088/0264-9381/25/1/015005
null
gr-qc
null
We present a definition of the distance between probability distributions. Our definition is based on the $L_1$ norm on space of probability measures. We compare our distance with the well-known Kullback-Leibler divergence and with the proper distance defined using the Fisher matrix as a metric on the parameter space. We consider using our notion of distance in several problems in gravitational wave data analysis: to place templates in the parameter space in searches for gravitational-wave signals, to assess quality of search templates, and to study the signal resolution.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 15:15:14 GMT" } ]
2008-11-26T00:00:00
[ [ "Budzyński", "Robert J.", "" ], [ "Kondracki", "Witold", "" ], [ "Królak", "Andrzej", "" ] ]
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712.4364
Dietrich Stauffer
Dietrich Stauffer, Przemyslaw A. Grabowicz and Janusz A. Holyst
Opinion Dynamics with Hopfield Neural Networks
Enlarged from 7 to 9 pages with new authors, new simulations, and a theory
null
null
null
physics.soc-ph
null
In Hopfield neural networks with up to 10^8 nodes we store two patterns through Hebb couplings. Then we start with a third random pattern which is supposed to evolve into one of the two stored patterns, simulating the cognitive process of associative memory leading to one of two possible opinions. With probability p each neuron independently, instead of following the Hopfield rule, takes over the corresponding value of another network, thus simulating how different people can convince each other. A consensus is achieved for high p.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 15:18:23 GMT" }, { "version": "v2", "created": "Mon, 17 Mar 2008 11:25:16 GMT" } ]
2008-03-17T00:00:00
[ [ "Stauffer", "Dietrich", "" ], [ "Grabowicz", "Przemyslaw A.", "" ], [ "Holyst", "Janusz A.", "" ] ]
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712.4365
Gianluca Panati
Gianluca Panati, Herbert Spohn, Stefan Teufel
Motions of electrons in adiabatically perturbed periodic structures
23 pages, no figures
in A. Mielke (editor), "Analysis, Modeling and Simulation of Multiscale Problems" (Final Report of the DFG Priority Program SPP 1095), Springer, 2006
null
null
math-ph math.MP
null
We study the motion of electrons in a periodic background potential (usually resulting from a crystalline solid). For small velocities one would use either the non-magnetic or the magnetic Bloch hamiltonian, while in the relativistic regime one would use the Dirac equation with a periodic potential. The dynamics, with the background potential included, is perturbed either through slowly varying external electromagnetic potentials or through a slow deformation of the crystal. In either case we discuss how the Hilbert space of states decouples into almost invariant subspaces and explain the effective dynamics within such a subspace.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 15:33:04 GMT" } ]
2007-12-31T00:00:00
[ [ "Panati", "Gianluca", "" ], [ "Spohn", "Herbert", "" ], [ "Teufel", "Stefan", "" ] ]
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712.4366
Sera Cremonini
Sera Cremonini, Robert de Mello Koch, Antal Jevicki
Matrix Model Maps and Reconstruction of AdS SUGRA Interactions
28 pages
Phys.Rev.D77:105005,2008
10.1103/PhysRevD.77.105005
null
hep-th
null
We consider the question of reconstructing (cubic) SUGRA interactions in AdS/CFT. The method we introduce is based on the matrix model maps (MMP) which were previously successfully employed at the linearized level. The strategy is to start with the map for 1/2 BPS configurations which is exactly known (to all orders) in the hamiltonian framework. We then use the extension of the matrix model map with the corresponding Ward identities to completely specify the interaction. A central point in this construction is the non-vanishing of off-shell interactions (even for highest-weight states).
[ { "version": "v1", "created": "Fri, 28 Dec 2007 15:58:15 GMT" }, { "version": "v2", "created": "Thu, 24 Jan 2008 04:03:17 GMT" } ]
2008-11-26T00:00:00
[ [ "Cremonini", "Sera", "" ], [ "Koch", "Robert de Mello", "" ], [ "Jevicki", "Antal", "" ] ]
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712.4367
Maurizio Bonesini M.
M. Bonesini (for the HARP Collaboration)
Deuteron production in p-Be interactions at 450 GeV/c and the coalescing model
EPS Conference HEP 2007, Manchester
J.Phys.Conf.Ser.110:032004,2008
10.1088/1742-6596/110/3/032004
null
hep-ex
null
The analysis of the deuteron production in p--Be interactions at 450 GeV/c taken by the NA56/SPY experiment at CERN SPS is presented. In the framework of the coalescence model, the coalescence factor $\kappa$ is determined as $(0.79 \pm 0.05 \pm 0.13) \times 10^{-2}$. Our results disfavour the hypothesis that coalescence be the dominant mechanism for deuteron production in $p+Be$ interactions at low $p_T$.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 16:14:39 GMT" } ]
2019-08-13T00:00:00
[ [ "Bonesini", "M.", "", "for the HARP Collaboration" ] ]
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712.4368
Felipe Asenjo A
Felipe Asenjo, Cristian A. Far\'ias and Pablo S. Moya
Statistical relativistic temperature transformation for ideal gas of bradyons, luxons and tachyons
5 pages, no figures
null
null
null
physics.gen-ph physics.class-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Starting from a microcanonical statistical approach and special relativity, the relativistic transformations for temperature and pressure for an ideal gas of bradyons, luxons or tachyons is found. These transformations are in agreement with the three laws of thermodynamic and our temperature transformation is the same as Ott's. Besides, it is shown that the thermodynamic $dS$ element is Lorentz-invariant.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 16:11:48 GMT" }, { "version": "v2", "created": "Thu, 5 Mar 2009 15:48:33 GMT" } ]
2009-03-05T00:00:00
[ [ "Asenjo", "Felipe", "" ], [ "Farías", "Cristian A.", "" ], [ "Moya", "Pablo S.", "" ] ]
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712.4369
Gianluca Panati
Gianluca Panati, Herbert Spohn and Stefan Teufel
The time-dependent Born-Oppenheimer approximation
17 pages, no figures
ESAIM: Math. Modelling and Numerical Analysis 41, 297-314 (2007)
10.1051/m2an:2007023
null
math-ph math.MP
null
We explain why the conventional argument for deriving the time-dependent Born-Oppenheimer approximation is incomplete and review recent mathematical results, which clarify the situation and at the same time provide a systematic scheme for higher order corrections. We also present a new elementary derivation of the correct second-order time-dependent Born-Oppenheimer approximation and discuss as applications the dynamics near a conical intersection of potential surfaces and reactive scattering.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 16:19:45 GMT" } ]
2007-12-31T00:00:00
[ [ "Panati", "Gianluca", "" ], [ "Spohn", "Herbert", "" ], [ "Teufel", "Stefan", "" ] ]
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712.437
Maurizio Bonesini M.
M. Bonesini (for the MICE Collaboration)
The design of the time-of-flight system for MICE
EPS Conference HEP 2007, Manchester
J.Phys.Conf.Ser.110:092004,2008
10.1088/1742-6596/110/9/092004
null
physics.ins-det
null
The international Muon Ionization Cooling Experiment (MICE) will carry out a systematic investigation of ionization cooling of a muon beam. As the emittance measurement will be done on a particle-by-particle basis, a sophisticated beam instrumentation is needed to measure particle coordinates and timing vs RF. The MICE time-of-flight system will measure timings with a resolution better than 70 ps per plane, in a harsh environment due to high particle rates, fringe magnetic fields and electron backgrounds from RF dark noise.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 16:32:34 GMT" } ]
2019-08-13T00:00:00
[ [ "Bonesini", "M.", "", "for the MICE Collaboration" ] ]
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712.4371
Niko Jokela
Niko Jokela, Matti Jarvinen, Esko Keski-Vakkuri
The Partition Function of a Multi-Component Coulomb Gas on a Circle
15 pages, 1 figure, v2: added discussion and references, version to appear in J. Phys. A
J.Phys.A41:145003,2008
10.1088/1751-8113/41/14/145003
HIP-2007-73/TH
cond-mat.stat-mech hep-th math-ph math.MP
null
We study a two-dimensional Coulomb gas consisting of a mixture of particles carrying various positive multiple integer charges, confined on a unit circle. We consider the system in the canonical and grand canonical ensembles, and attempt to calculate the partition functions analytically, using Toeplitz and confluent Vandermonde determinants. Just like in the simple one-component system (Dyson gas), the partition functions simplify at special temperature $\beta=2$, allowing us to find compact expressions for them.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 16:33:30 GMT" }, { "version": "v2", "created": "Thu, 13 Mar 2008 12:01:02 GMT" } ]
2008-11-26T00:00:00
[ [ "Jokela", "Niko", "" ], [ "Jarvinen", "Matti", "" ], [ "Keski-Vakkuri", "Esko", "" ] ]
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712.4372
Brant M. Johnson
PHENIX Collaboration: S. Afanasiev, et al
Source breakup dynamics in Au+Au Collisions at sqrt(s_NN)=200 GeV via three-dimensional two-pion source imaging
345 authors, 6 pages text, RevTeX-4, 3 figures. Submitted to Physical Review Letters. Plain text data tables for the points plotted in figures for this and previous PHENIX publications are (or will be) publicly available at http://www.phenix.bnl.gov/papers.html
Phys.Rev.Lett.100:232301,2008
10.1103/PhysRevLett.100.232301
null
nucl-ex
null
A three-dimensional (3D) correlation function obtained from mid-rapidity, low pT pion pairs in central Au+Au collisions at sqrt(s_NN)=200 GeV is studied. The extracted model-independent source function indicates a long range tail in the directions of the pion pair transverse momentum (out) and the beam (long). Model comparisons to these distensions indicate a proper breakup time \tau_0 ~ 9 fm/c and a mean proper emission duration \Delta\tau ~ 2 fm/c, leading to sizable emission time differences (<|\Delta \tau_LCM |> ~ 12 fm/c), partly due to resonance decays. They also suggest an outside-in "burning" of the emission source reminiscent of many hydrodynamical models.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 20:18:34 GMT" } ]
2008-11-26T00:00:00
[ [ "PHENIX Collaboration", "", "" ], [ "Afanasiev", "S.", "" ] ]
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712.4373
Takayuki Tsuchida
Takayuki Tsuchida
New reductions of integrable matrix PDEs: $Sp(m)$-invariant systems
33 pages; (v4) to appear in JMP; This paper states clearly that the elementary function solutions of (a vector/matrix generalization of) the derivative NLS equation can be expressed as the partial $x$-derivatives of elementary functions. Explicit soliton solutions are given in the author's talks at http://poisson.ms.u-tokyo.ac.jp/~tsuchida/
J. Math. Phys. 51 (2010) 053511
10.1063/1.3315862
OIQP-06-22
nlin.SI math-ph math.AP math.MP nlin.PS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We propose a new type of reduction for integrable systems of coupled matrix PDEs; this reduction equates one matrix variable with the transposition of another multiplied by an antisymmetric constant matrix. Via this reduction, we obtain a new integrable system of coupled derivative mKdV equations and a new integrable variant of the massive Thirring model, in addition to the already known systems. We also discuss integrable semi-discretizations of the obtained systems and present new soliton solutions to both continuous and semi-discrete systems. As a by-product, a new integrable semi-discretization of the Manakov model (self-focusing vector NLS equation) is obtained.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 17:10:07 GMT" }, { "version": "v2", "created": "Thu, 24 Jan 2008 11:17:46 GMT" }, { "version": "v3", "created": "Thu, 13 Mar 2008 12:27:53 GMT" }, { "version": "v4", "created": "Thu, 21 Jan 2010 10:16:34 GMT" }, { "version": "v5", "created": "Thu, 29 Dec 2011 10:34:59 GMT" } ]
2011-12-30T00:00:00
[ [ "Tsuchida", "Takayuki", "" ] ]
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712.4374
Kin Hung Fung
Kin Hung Fung, C. T. Chan
Analytical study of the plasmonic modes of metal nanoparticle circular array
18 pages, 6 figures
Phys. Rev. B 77, 205423 (2008)
10.1103/PhysRevB.77.205423
null
physics.optics cond-mat.mes-hall
null
We analyze the plasmonic modes of a metal nanoparticle circular array. Closed form solutions to the eigenmode problem are given. For each polarization, the plasmonic mode with the highest quality is found to be an antiphase mode. We found that the significant suppression in radiative loss can be understood as the cancellation of the dipolar radiation term in the radiative linewidth. The remaining finite radiative linewidth decreases exponentially as the number of particle increases.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 17:15:20 GMT" } ]
2016-07-29T00:00:00
[ [ "Fung", "Kin Hung", "" ], [ "Chan", "C. T.", "" ] ]
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712.4375
Vladimir Dobrev
V.K. Dobrev
Positive Energy Representations, Holomorphic Discrete Series and Finite-Dimensional Irreps
28 pages, TEX with Harvmac using amssym.def, amssym.tex, epsf.tex; v2: new texts in Sections 1 & 3, new refs; v3: added 5 figures; v4,v5: small corrections
J.Phys.A41:425206,2008
10.1088/1751-8113/41/42/425206
SISSA 77/2007/EP, INRNE-TH-07-12
hep-th math-ph math.MP math.QA math.RT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Let G be a semi-simple non-compact Lie group with unitary lowest/highest weight representations. We consider explicitly the relation between three types of representations of G: positive energy (unitary lowest weight)representations, (holomorphic) discrete series representations and non-unitary finite-dimensional irreps. We consider mainly the conformal groups SO(n,2) treating in full detail the cases n=1,3,4.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 17:22:12 GMT" }, { "version": "v2", "created": "Fri, 18 Jul 2008 16:38:41 GMT" }, { "version": "v3", "created": "Tue, 19 Aug 2008 18:54:54 GMT" }, { "version": "v4", "created": "Tue, 4 Sep 2012 13:38:33 GMT" }, { "version": "v5", "created": "Sun, 5 Dec 2021 14:55:33 GMT" } ]
2021-12-07T00:00:00
[ [ "Dobrev", "V. K.", "" ] ]
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712.4376
Jialun Ping
Hourong Pang, Jialun Ping, Fan Wang
Study on $N\bar{N}$ $S$-wave Elastic Cross Section and Possible Bound States Within a Constituent Quark Model
15 pages, 8 figures
Chin.Phys.Lett.25:3192-3195,2008
10.1088/0256-307X/25/9/027
null
nucl-th
null
In the framework of a chiral constituent quark model, considering the contributions of $\pi$ annihilation and one-gluon annihilation, the proton-antiproton $S$-wave elastic scattering cross section experimental data can be reproduced by adjusting properly one-gluon annihilation coupling constant. Meanwhile, using the fixed model parameter, we do a dynamical calculation for all possible $S$-wave nucleon-antinucleon states, the results show that, there is no $S$-wave bound state as indicated by a strong enhancement at threshold of $p\bar{p}$ in $J/\psi$ and $B$ decays.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 17:23:43 GMT" } ]
2008-11-26T00:00:00
[ [ "Pang", "Hourong", "" ], [ "Ping", "Jialun", "" ], [ "Wang", "Fan", "" ] ]
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712.4377
Markus Mueller
Markus Mueller
Quantum Kolmogorov Complexity and the Quantum Turing Machine
Ph.D. thesis, Technical University of Berlin, August 2007. 114 pages, 4 figures
null
null
null
quant-ph
null
The purpose of this thesis is to give a formal definition of quantum Kolmogorov complexity (QC), and rigorous mathematical proofs of its basic properties. The definition used here is similar to that by Berthiaume, van Dam, and Laplante. It defines the QC of some indeterminate-length qubit string \rho as the minimum base length of any quantum input which makes a quantum Turing machine (QTM) halt and output \rho, up to some error tolerance. First, we prove that there is a QTM which is universal in the sense of input base length. Furthermore, we show several general properties of QTMs, including a result on mutually orthogonal ``halting spaces'', and a way to transform every almost-halting input into a deterministically-halting input by adding at most a constant number of qubits. Afterwards, we apply these results to QC. In particular, we show that QC is invariant, incompressible, agrees with classical Kolmogorov complexity for classical strings, and is closely related to von Neumann entropy for ergodic quantum information sources.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 17:29:09 GMT" } ]
2007-12-31T00:00:00
[ [ "Mueller", "Markus", "" ] ]
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712.4378
Alireza Saffarzadeh
Alireza Saffarzadeh
Temperature dependence of surface magnetization in local-moment systems
9 pages,8 figures
Surface Science 600 (2006) 4785
10.1016/j.susc.2006.07.048
null
cond-mat.dis-nn
null
We present a theory to study the temperature-dependent behavior of surface states in a ferromagnetic semi-infinite crystal. Our approach is based on the single-site approximation for the \emph{s-f} model. The effect of the semi-infinite nature of the crystal is taken into account by a localized perturbation method. Using the mean-field theory for the layer-dependent magnetization, the local density of states and the electron-spin polarization are investigated at different temperatures for ordinary and surface transition cases. The results show that the surface magnetic properties may differ strongly from those in the bulk and the coupling constant of atoms plays a decisive role in the degree of spin polarization. In particular, for the case in which the exchange coupling constant on the surface and between atoms in the first and second layer is higher than the corresponding in the bulk, an enhancement of surface Curie temperature and hence the spin polarization can be obtained.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 17:37:00 GMT" } ]
2009-11-13T00:00:00
[ [ "Saffarzadeh", "Alireza", "" ] ]
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