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712.4379
Elif Yilmaz
Elif Yilmaz
A Note on Overtwisted Contact Structures
4 pages, 1 figure
null
null
null
math.GT
null
In this note, we use the recent work of Honda-Kazez-Matic [HKM] to prove that a closed contact 3-manifold admitting a compatible open book decomposition with a nontrivial monodromy which can be presented as a product of left handed Dehn twists is overtwisted.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 18:46:59 GMT" } ]
2007-12-31T00:00:00
[ [ "Yilmaz", "Elif", "" ] ]
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712.438
Molaro Paolo
Paolo Molaro, Dieter Reimers, Irina I. Agafonova, Sergei A. Levshakov
Bounds on the fine structure constant variability from FeII absorption lines in QSO spectra
Talk given at ACFC 2007 "Atomic Clocks and Fundamental Constants" conference, Bad Honnef, June 2007, Savely Karshenboim and Ekkehard Peik editors
Eur.Phys.J.ST 163:173-189,2008
10.1140/epjst/e2008-00818-4
null
astro-ph
null
The Single Ion Differential alpha Measurement (SIDAM) method for measuring fine stucture variations (daa)and its figures of merit are illustrated together with the results produced by means of FeII absorption lines of QSO intervening systems. The method provides daa ~= -0.12(+/- 1.79) ppm (parts-per-million) at zabs = 1.15 towards HE 0515--4414 and daa = 5.66(+/-2.67) ppm at zabs= 1.84 towards Q 1101--264, which are so far the most accurate measurements for single systems. SIDAM analysis for 3 systems from the Chand et al. (2004) sample provides inconsistent results which we interpret as due to calibration errors of the Chand et al. data at the level of about 10 ppm. In one system evidence for photo-ionization Doppler shift between MgII and FeII lines is found. This evidence has important bearings on the Many Multiplet method where the signal for daa variability is carried mainly by systems involving MgII absorbers. Some correlations are also found in the Murphy et al. sample which suggest larger errors than previously reported. Thus, we consider unlikely that both the Chand et al. and Murphy et al. datasets could provide an estimate of daa with an accuracy at the level of 1 ppm. A new spectrograph like the ESPRESSO project will be crucial to make progress in the astronomical determination of daa.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 17:42:42 GMT" } ]
2009-06-23T00:00:00
[ [ "Molaro", "Paolo", "" ], [ "Reimers", "Dieter", "" ], [ "Agafonova", "Irina I.", "" ], [ "Levshakov", "Sergei A.", "" ] ]
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712.4381
William Bialek
William Bialek, Rob R. de Ruyter van Steveninck and Naftali Tishby
Efficient representation as a design principle for neural coding and computation
Based on a presentation at the International Symposium on Information Theory 2006
null
null
null
q-bio.NC
null
Does the brain construct an efficient representation of the sensory world? We review progress on this question, focusing on a series of experiments in the last decade which use fly vision as a model system in which theory and experiment can confront each other. Although the idea of efficient representation has been productive, clearly it is incomplete since it doesn't tell us which bits of sensory information are most valuable to the organism. We suggest that an organism which maximizes the (biologically meaningful) adaptive value of its actions given fixed resources should have internal representations of the outside world that are optimal in a very specific information theoretic sense: they maximize the information about the future of sensory inputs at a fixed value of the information about their past. This principle contains as special cases computations which the brain seems to carry out, and it should be possible to test this optimization directly. We return to the fly visual system and report the results of preliminary experiments that are in encouraging agreement with theory.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 17:46:41 GMT" } ]
2007-12-31T00:00:00
[ [ "Bialek", "William", "" ], [ "van Steveninck", "Rob R. de Ruyter", "" ], [ "Tishby", "Naftali", "" ] ]
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712.4382
William Bialek
Samuel F. Taylor, Naftali Tishby and William Bialek
Information and fitness
null
null
null
null
q-bio.PE
null
The growth rate of organisms depends both on external conditions and on internal states, such as the expression levels of various genes. We show that to achieve a criterion mean growth rate over an ensemble of conditions, the internal variables must carry a minimum number of bits of information about those conditions. Evolutionary competition thus can select for cellular mechanisms that are more efficient in an abstract, information theoretic sense. Estimates based on recent experiments suggest that the minimum information required for reasonable growth rates is close to the maximum information that can be conveyed through biologically realistic regulatory mechanisms. These ideas are applicable most directly to unicellular organisms, but there are analogies to problems in higher organisms, and we suggest new experiments for both cases.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 18:08:37 GMT" } ]
2007-12-31T00:00:00
[ [ "Taylor", "Samuel F.", "" ], [ "Tishby", "Naftali", "" ], [ "Bialek", "William", "" ] ]
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712.4383
A. J. Buchmann
A.J. Buchmann
Structure of strange baryons
6 pages, 1 figure, Talk given at IX Int. Conf. on Hypernuclear and Strange Particle Physics, Hyp 2006, Oct. 10-14, 2006, Mainz, Germany
Proceedings of IX Int. Conf. on Hypernuclear and Strange Particle Physics, Oct. 10-14, 2006, Mainz, Germany, eds. J. Pochodzalla and Th. Walcher, Springer-Verlag, 2007, pg. 329
null
null
hep-ph nucl-th
null
The charge radii and quadrupole moments of baryons with nonzero strangeness are calculated using a parametrization method based on the symmetries of the strong interaction.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 18:11:16 GMT" } ]
2008-01-02T00:00:00
[ [ "Buchmann", "A. J.", "" ] ]
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712.4384
Vadim Naumov
Konstantin S. Kuzmin (Dubna, JINR), Vladimir V. Lyubushkin (Dubna, JINR & Irkutsk State U.), Vadim A. Naumov (Dubna, JINR)
Quasielastic axial-vector mass from experiments on neutrino-nucleus scattering
27 pages, 19 figures. Typos corrected; tables, figures and references added, discussion extended; matches published version
Eur.Phys.J.C54:517-538,2008
10.1140/epjc/s10052-008-0582-x
null
hep-ph hep-ex nucl-ex nucl-th
null
We analyze available experimental data on the total and differential charged-current cross sections for quasielastic neutrino and antineutrino scattering off nucleons, measured with a variety of nuclear targets in the accelerator experiments at ANL, BNL, FNAL, CERN, and IHEP, dating from the end of sixties to the present day. The data are used to adjust the poorly known value of the axial-vector mass of the nucleon.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 18:22:53 GMT" }, { "version": "v2", "created": "Sun, 30 Dec 2007 12:53:29 GMT" }, { "version": "v3", "created": "Mon, 28 Apr 2008 17:19:50 GMT" } ]
2008-11-26T00:00:00
[ [ "Kuzmin", "Konstantin S.", "", "Dubna, JINR" ], [ "Lyubushkin", "Vladimir V.", "", "Dubna,\n JINR & Irkutsk State U." ], [ "Naumov", "Vadim A.", "", "Dubna, JINR" ] ]
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712.4385
William Bialek
Gasper Tkacik and William Bialek
Cell biology: Networks, regulation, pathways
null
null
null
null
q-bio.MN
null
This review was written for the Encyclopedia of Complexity and System Science (Springer-Verlag, Berlin, 2008), and is intended as a guide to the growing literature which approaches the phenomena of cell biology from a more theoretical point of view. We begin with the building blocks of cellular networks, and proceed toward the different classes of models being explored, finally discussing the "design principles" which have been suggested for these systems. Although largely a dispassionate review, we do draw attention to areas where there seems to be general consensus on ideas that have not been tested very thoroughly and, more optimistically, to areas where we feel promising ideas deserve to be more fully explored.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 18:45:14 GMT" } ]
2007-12-31T00:00:00
[ [ "Tkacik", "Gasper", "" ], [ "Bialek", "William", "" ] ]
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712.4386
Amol Dighe
Amol Dighe
Neutrinos from a core collapse supernova
5 pages, aipproc format, Plenary talk at NuFact07
AIPConf.Proc.981:75-79,2008
10.1063/1.2899006
TIFR/TH/07-40
hep-ph
null
The neutrino burst from a galactic supernova can help determine the neutrino mass hierarchy and $\theta_{13}$, and provide crucial information about supernova astrophysics. Here we review our current understanding of the neutrino burst, flavor conversions of these neutrinos, and model independent signatures of various neutrino mixing scenarios.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 18:18:58 GMT" } ]
2008-11-26T00:00:00
[ [ "Dighe", "Amol", "" ] ]
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712.4387
Yi Ni
Yi Ni
Dehn surgeries that yield fibred $3$--manifolds
15 pages
null
null
AIM 2007-102
math.GT
null
We study Dehn surgeries on null-homotopic knots that yield fibred $3$--manifolds when an additional (but natural) homological restriction is imposed. The major tool used is Gabai's theory of sutured manifold decomposition. Such surgeries are negative examples to a question of Michel Boileau. Another result we will prove is about surgeries which reduce the Thurston norm of a fibred manifold.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 18:27:24 GMT" } ]
2007-12-31T00:00:00
[ [ "Ni", "Yi", "" ] ]
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712.4388
Dan Edidin
Dan Edidin and Damiano Fulghesu
The integral Chow ring of the stack of hyperelliptic curves of even genus
12 pages, Latex2e
Math Research Letters, v.16 (2009) no. 1., 27-40
null
null
math.AG
null
Let $g$ be an even positive integer. In this paper we compute the integral Chow ring of the stack of smooth hyperelliptic curves of genus $g$.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 18:33:47 GMT" } ]
2009-04-29T00:00:00
[ [ "Edidin", "Dan", "" ], [ "Fulghesu", "Damiano", "" ] ]
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712.4389
Caroline Milstene
C. Milstene, A. Freitas, M. Schmitt, A. Sopczak
Precision Measurement of a Particle Mass at the Linear Collider
6 pages, 4 figures, 3tables, Conference(Workshop)-LCWS/ILC2007-June,2,2007
ECONF C0705302:SUS16,2007
10.2172/919937
FERMILAB-CONF-07-184-E
hep-ph
null
Precision measurement of the stop mass at the ILC is done in a method based on cross-sections measurements at two different center-of-mass energies. This allows to minimize both the statistical and systematic errors. In the framework of the MSSM, a light stop, compatible with electro-weak baryogenesis, is studied in its decay into a charm jet and neutralino, the Lightest Supersymmetric Particle(LSP), as a candidate of dark matter. This takes place for a small stop-neutralino mass difference.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 18:33:51 GMT" } ]
2011-03-18T00:00:00
[ [ "Milstene", "C.", "" ], [ "Freitas", "A.", "" ], [ "Schmitt", "M.", "" ], [ "Sopczak", "A.", "" ] ]
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712.439
Molaro Paolo
Paolo Molaro
Science with a 16m VLT: the case for variability of fundamental constan ts
Talk given at the ESO Workshop: Science with the ELT in the ELT Era. Alan Moorwood editor
null
null
null
astro-ph
null
Only astronomical observations can effectively probe in space-time the variabil ity of the physical dimensionless constants such as the fine structure constant and proton-to-electron mass ratio, \mu, which are related to fund amental forces of nature. Several theories beyond the Standard Model (SM) allow fundamental constants to vary, but they cannot make quantitative predictions so that only laboratory experiments and astronomical observations can show if th is is the case or set the allowed bounds. At the moment of writing there are c laims for a variability of both \alpha and \mu at 5 and 4\sigma of C.L., respectively, although for \alpha they are contrasted by null results. The observations are challenging and a new spectrograph such as ESPRESSO at the combined incoherent focus of 4 VLT units (a potential 16 m equivalent telescope) will allow for a significant improvement in the precision measurement clearing up the controversy. If the variations will be confirmed, the implications are far reaching, revealing new physics beyond the SM and pointing a direction for GUTs theories. A most exciting ossibility is that a variation of \alpha is induced by quintessence through its coupling with the electromagnetic field. If this is the case an accurate measurement of the variability could provide a way for reconstructing the equation of state of Dark Energy (Avelino et al 2006).
[ { "version": "v1", "created": "Fri, 28 Dec 2007 18:36:25 GMT" } ]
2007-12-31T00:00:00
[ [ "Molaro", "Paolo", "" ] ]
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712.4391
Merce Romero-Gomez
M. Romero-Gomez, E. Athanassoula, J.J. Masdemont, C. Garcia-Gomez
The formation of spiral arms and rings in barred galaxies
9 pages, 4 figures, conference proceedings of "Chaos, complexity and transport: Theory and Applications", Marseille, June 2007
null
null
LAM-07-06
astro-ph
null
We propose a new theory to explain the formation of spiral arms and of all types of outer rings in barred galaxies. We have extended and applied the technique used in celestial mechanics to compute transfer orbits. Thus, our theory is based on the chaotic orbital motion driven by the invariant manifolds associated to the periodic orbits around the hyperbolic equilibrium points. In particular, spiral arms and outer rings are related to the presence of heteroclinic or homoclinic orbits. Thus, R1 rings are associated to the presence of heteroclinic orbits, while R1R2 rings are associated to the presence of homoclinic orbits. Spiral arms and R2 rings, however, appear when there exist neither heteroclinic nor homoclinic orbits. We examine the parameter space of three realistic, yet simple, barred galaxy models and discuss the formation of the different morphologies according to the properties of the galaxy model. The different morphologies arise from differences in the dynamical parameters of the galaxy.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 18:58:38 GMT" } ]
2007-12-31T00:00:00
[ [ "Romero-Gomez", "M.", "" ], [ "Athanassoula", "E.", "" ], [ "Masdemont", "J. J.", "" ], [ "Garcia-Gomez", "C.", "" ] ]
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712.4392
Manuel Asorey
M. Asorey and J. M. Munoz-Castaneda
Vacuum Structure and Boundary Renormalization Group
8 pages
J.Phys.A41:164043,2008
10.1088/1751-8113/41/16/164043
null
hep-th
null
The vacuum structure is probed by boundary conditions. The behaviour of thermodynamical quantities like free energy, boundary entropy and entanglement entropy under the boundary renormalization group flow are analysed in 2D conformal field theories. The results show that whereas vacuum energy and boundary entropy turn out to be very sensitive to boundary conditions, the vacuum entanglement entropy is independent of boundary properties when the boundary of the entanglement domain does not overlap the boundary of the physical space. In all cases the second law of thermodynamics holds along the boundary renormalization group flow.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 19:02:51 GMT" } ]
2008-11-26T00:00:00
[ [ "Asorey", "M.", "" ], [ "Munoz-Castaneda", "J. M.", "" ] ]
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712.4393
Alan Kostelecky
Alan Kostelecky, Neil Russell, and Jay Tasson
Constraints on Torsion from Lorentz Violation
4 pages two-column REVTeX, accepted in Physical Review Letters
Phys.Rev.Lett.100:111102,2008
10.1103/PhysRevLett.100.111102
IUHET 510, December 2007
gr-qc astro-ph hep-ph
null
Exceptional sensitivity to spacetime torsion can be achieved by searching for its couplings to fermions. Recent experimental searches for Lorentz violation are exploited to extract new constraints involving 19 of the 24 independent torsion components down to levels of order 10^{-31} GeV.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 19:06:18 GMT" }, { "version": "v2", "created": "Tue, 5 Feb 2008 19:10:38 GMT" } ]
2009-11-13T00:00:00
[ [ "Kostelecky", "Alan", "" ], [ "Russell", "Neil", "" ], [ "Tasson", "Jay", "" ] ]
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712.4394
Jean-Paul Blaizot
A. Beraudo, J.-P. Blaizot and C. Ratti
Real and imaginary-time $Q\bar{Q}$ correlators in a thermal medium
32 pages, 8 figures
Nucl.Phys.A806:312-338,2008
10.1016/j.nuclphysa.2008.03.001
null
nucl-th
null
We investigate the behavior of a pair of heavy fermions, denoted by $Q$ and $\bar{Q}$, in a hot/dense medium. Although we have in mind the situation where $Q$ and $\bar{Q}$ denote heavy quarks, our treatment will be limited to simplified models, which bear only some general similarities with QCD. We study in particular the limiting case where the mass of the heavy fermions is infinite. Then a number of results can be derived exactly: a Schr\"odinger equation can be established for the correlator of the heavy quarks; the interaction effects exponentiate, leading to a simple instantaneous effective potential for this Schr\"odinger equation. We consider simple models for the medium in which the $Q\bar Q$ pair propagates. In the case where the medium is a plasma of photons and light charged fermions, an imaginary part develops in this effective potential. We discuss the physical interpretation of this imaginary part in terms of the collisions between the heavy particles and the light fermions of the medium; the same collisions also determine the damping rate of the heavy fermions. Finally we study the connection between the real-time propagator of the heavy fermion pair and its Euclidean counterpart, and show that the real part of the potential entering the Schr\"odinger equation for the real-time propagator is the free energy calculated in the imaginary-time formalism.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 18:58:32 GMT" } ]
2008-11-26T00:00:00
[ [ "Beraudo", "A.", "" ], [ "Blaizot", "J. -P.", "" ], [ "Ratti", "C.", "" ] ]
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712.4395
Zhiwei Yun
Zhiwei Yun
Goresky-MacPherson calculus for the affine flag varieties
null
Canad. J. Math. 62 (2010), no. 2, 473-480
null
null
math.AG math.AT
null
We use the fixed point arrangement technique developed by Goresky-MacPherson to calculate the part of the equivariant cohomology of the affine flag varieties generated by degree 2. This turns out to be a quadric cone. We also describe the spectrum of the full equivariant cohomology ring as an explicit geometric object. We use our results to show that the vertices of the moment map images of the affine flag varieties lie on a paraboloid.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 19:48:27 GMT" } ]
2011-01-07T00:00:00
[ [ "Yun", "Zhiwei", "" ] ]
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712.4396
Lotfi Hermi
Mark S. Ashbaugh, Lotfi Hermi
On Harrell-Stubbe Type Inequalities for the Discrete Spectrum of a Self-Adjoint Operator
42 pages
null
null
null
math.SP math.DG
null
We produce a new proof and extend results by Harrell and Stubbe for the discrete spectrum of a self-adjoint operator. An abstract approach--based on commutator algebra, the Rayleigh-Ritz principle, and an ``optimal'' usage of the Cauchy-Schwarz inequality--is used to produce ``parameter-free'', ``projection-free'' versions of their theorems. We also analyze the strength of the various inequalities that ensue. The results contain classical bounds for the eigenvalues. Extensions of a variety of inequalities \`a la Harrell-Stubbe are illustrated for both geometric and physical problems.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 19:51:02 GMT" } ]
2007-12-31T00:00:00
[ [ "Ashbaugh", "Mark S.", "" ], [ "Hermi", "Lotfi", "" ] ]
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712.4397
William Bialek
William Bialek and Rama Ranganathan
Rediscovering the power of pairwise interactions
null
null
null
null
q-bio.QM
null
Two recent streams of work suggest that pairwise interactions may be sufficient to capture the complexity of biological systems ranging from protein structure to networks of neurons. In one approach, possible amino acid sequences in a family of proteins are generated by Monte Carlo annealing of a "Hamiltonian" that forces pairwise correlations among amino acid substitutions to be close to the observed correlations. In the other approach, the observed correlations among pairs of neurons are used to construct a maximum entropy model for the states of the network as a whole. We show that, in certain limits, these two approaches are mathematically equivalent, and we comment on open problems suggested by this framework
[ { "version": "v1", "created": "Fri, 28 Dec 2007 19:53:09 GMT" } ]
2007-12-31T00:00:00
[ [ "Bialek", "William", "" ], [ "Ranganathan", "Rama", "" ] ]
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712.4398
Yonatan Dubi
Y. Dubi, Y. Meir, Y. Avishai
Island formation in disordered superconducting thin films at finite magnetic fields
7 pages, 7 figures. Some typos corrected, introduction and summary revised, some annotation changed
Phys. Rev. B 78, 024502 (2008).
10.1103/PhysRevB.78.024502
null
cond-mat.supr-con cond-mat.dis-nn
null
The existence of "superconducting islands" (i.e., locally confined regions with superconducting correlations) in amorphous superconducting thin films can account for numerous experimental findings. Such spatial fluctuations in the superconducting gap were indeed observed experimentally, and were shown to persist into the insulating side of the superconductor-insulator transition. In this work a detailed account on the formation and evolution of superconducting islands in disordered two-dimensional superconductors is presented, using a locally self-consistent numerical solution of the Bogoliubov-de-Gennes equations. Specifically, the formation of SC islands is demonstrated, and their evolution with an applied perpendicular magnetic field is studied in details, along with the disorder-induced vortex-pinning. Simulating the presence of a parallel Zeeman field it is demonstrated that the islands are indeed uncorrelated superconducting domains. Experimental predictions based on this analysis are presented.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 19:59:51 GMT" }, { "version": "v2", "created": "Wed, 16 Apr 2008 18:19:39 GMT" } ]
2009-11-13T00:00:00
[ [ "Dubi", "Y.", "" ], [ "Meir", "Y.", "" ], [ "Avishai", "Y.", "" ] ]
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712.4399
Peter Hegarty
Peter Hegarty
The inverse problem for representation functions for general linear forms
15 pages, no figures
null
null
null
math.NT math.CO
null
The inverse problem for representation functions takes as input a triple (X,f,L), where X is a countable semigroup, f : X --> N_0 \cup {\infty} a function, L : a_1 x_1 + ... + a_h x_h an X-linear form and asks for a subset A \subseteq X such that there are f(x) solutions (counted appropriately) to L(x_1,...,x_h) = x for every x \in X, or a proof that no such subset exists. This paper represents the first systematic study of this problem for arbitrary linear forms when X = Z, the setting which in many respects is the most natural one. Having first settled on the "right" way to count representations, we prove that every primitive form has a unique representation basis, i.e.: a set A which represents the function f \equiv 1. We also prove that a partition regular form (i.e.: one for which no non-empty subset of the coefficients sums to zero) represents any function f for which {f^{-1}(0)} has zero asymptotic density. These two results answer questions recently posed by Nathanson. The inverse problem for partition irregular forms seems to be more complicated. The simplest example of such a form is x_1 - x_2, and for this form we provide some partial results. Several remaining open problems are discussed.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 20:09:42 GMT" } ]
2007-12-31T00:00:00
[ [ "Hegarty", "Peter", "" ] ]
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712.44
Melvin Leok
Anthony M. Bloch, Islam I. Hussein, Melvin Leok, Amit K. Sanyal
Geometric structure-preserving optimal control of the rigid body
22 pages, 3 figures
null
null
null
math.OC
null
In this paper we study a discrete variational optimal control problem for the rigid body. The cost to be minimized is the external torque applied to move the rigid body from an initial condition to a pre-specified terminal condition. Instead of discretizing the equations of motion, we use the discrete equations obtained from the discrete Lagrange--d'Alembert principle, a process that better approximates the equations of motion. Within the discrete-time setting, these two approaches are not equivalent in general. The kinematics are discretized using a natural Lie-algebraic formulation that guarantees that the flow remains on the Lie group SO(3) and its algebra so(3). We use Lagrange's method for constrained problems in the calculus of variations to derive the discrete-time necessary conditions. We give a numerical example for a three-dimensional rigid body maneuver.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 20:26:26 GMT" } ]
2007-12-31T00:00:00
[ [ "Bloch", "Anthony M.", "" ], [ "Hussein", "Islam I.", "" ], [ "Leok", "Melvin", "" ], [ "Sanyal", "Amit K.", "" ] ]
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712.4401
Artan Borici
Artan Borici
Creutz Fermions on an Orthogonal Lattice
9 pages, version to be published in PRD
Phys.Rev.D78:074504,2008
10.1103/PhysRevD.78.074504
null
hep-lat
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In a recent paper, Creutz has given a new action describing two species of Dirac fermions with exact chiral symmetry on the lattice. This action depends on a parameter which may be fixed at a certain value in order to get the right continuum limit. In this letter, we elaborate more on this idea and present an action which is free of any other parameter except the fermion mass.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 20:31:01 GMT" }, { "version": "v2", "created": "Tue, 16 Sep 2008 17:26:07 GMT" } ]
2008-11-26T00:00:00
[ [ "Borici", "Artan", "" ] ]
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712.4402
Ruadhan O'Flanagan
Ruadhan O'Flanagan
Judgment
20 pages; minor changes; references added; submitted
null
null
null
math.PR cs.AI math.LO
null
The concept of a judgment as a logical action which introduces new information into a deductive system is examined. This leads to a way of mathematically representing implication which is distinct from the familiar material implication, according to which "If A then B" is considered to be equivalent to "B or not-A". This leads, in turn, to a resolution of the paradox of the raven.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 21:00:01 GMT" }, { "version": "v2", "created": "Sat, 29 Dec 2007 03:57:26 GMT" }, { "version": "v3", "created": "Fri, 18 Jan 2008 21:30:57 GMT" } ]
2011-11-10T00:00:00
[ [ "O'Flanagan", "Ruadhan", "" ] ]
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712.4403
Bert Schroer
Bert Schroer
Localization-Entropy from Holography on Null-Surfaces and the Split Property
35 pages, removal of misprints, bibliographical shortcomings repaired, added paragraph in section 6
null
null
null
hep-th cond-mat.other gr-qc quant-ph
null
Using the conformal equivalence of translational KMS states on chiral theories with dilational KMS states obtained from restricting the vacuum state to an interval (the chiral inversion of the Unruh-effect) it was shown in a previous publications that the diverging volume (length) factor of the thermodynamic limit corresponds to the logarithmic increase in the attenuation length of the localization-caused vacuum polarization cloud near the causal boundary. This is not a coincidence but rather a structural consequence of the fact that both operator algebras are of the same unique von Neumann type which is completely different from that met in quantum mechanical algebras. Together with the technique of holographic projection this leads to the universal area proportionality. The main aim in this paper is to present a derivation which is more in the spirit of recent work on entanglement entropy in condensed matter physics, especially to that of the replica trick as used by Cardy and collaborators. The essential new ingredient is the use of the split property which already has shown its constructive power in securing the existence of models of factorizing theories.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 20:36:11 GMT" }, { "version": "v2", "created": "Wed, 2 Jan 2008 20:22:04 GMT" } ]
2008-01-03T00:00:00
[ [ "Schroer", "Bert", "" ] ]
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712.4404
Alexander Solovyov
Marcus K. Benna, Anatoly Dymarsky, Igor R. Klebanov and Alexander Solovyov
On Normal Modes of a Warped Throat
LaTeX, 29 pages, 4 eps figures
JHEP 0806:070,2008
10.1088/1126-6708/2008/06/070
PUPT-2253, SU-ITP-07/25, ITEP-TH-79/07
hep-th
null
As shown in arXiv:hep-th/0405282, the warped deformed conifold has two bosonic massless modes, a pseudoscalar and a scalar, that are dual to the phase and the modulus of the baryonic condensates in the cascading gauge theory. We reconsider the scalar mode sector, mixing fluctuations of the NS-NS 2-form and the metric, and include non-zero 4-d momentum $k_\mu$. The resulting pair of coupled equations produce a discrete spectrum of $m_4^2=- k_\mu^2$ which is interpreted as the spectrum of $J^{PC}= 0^{+-}$ glueballs in the gauge theory. Similarly, we derive the spectrum of certain pseudoscalar glueballs with $J^{PC}= 0^{--}$, which originate from the decoupled fluctuations of the RR 2-form. We argue that each of the massive scalar or pseudoscalar modes we find belongs to a 4-d massive axial vector or vector supermultiplet. We also discuss our results in the context of a finite length throat embedded into a type IIB flux compactification.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 20:42:10 GMT" } ]
2014-11-18T00:00:00
[ [ "Benna", "Marcus K.", "" ], [ "Dymarsky", "Anatoly", "" ], [ "Klebanov", "Igor R.", "" ], [ "Solovyov", "Alexander", "" ] ]
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712.4405
Steven Detweiler
Ian Vega, Steven Detweiler
Regularization of fields for self-force problems in curved spacetime: foundations and a time-domain application
15 pages, 12 figures, 1 table. More figures, extended summary
Phys.Rev.D77:084008,2008
10.1103/PhysRevD.77.084008
null
gr-qc
null
We propose an approach for the calculation of self-forces, energy fluxes and waveforms arising from moving point charges in curved spacetimes. As opposed to mode-sum schemes that regularize the self-force derived from the singular retarded field, this approach regularizes the retarded field itself. The singular part of the retarded field is first analytically identified and removed, yielding a finite, differentiable remainder from which the self-force is easily calculated. This regular remainder solves a wave equation which enjoys the benefit of having a non-singular source. Solving this wave equation for the remainder completely avoids the calculation of the singular retarded field along with the attendant difficulties associated with numerically modeling a delta function source. From this differentiable remainder one may compute the self-force, the energy flux, and also a waveform which reflects the effects of the self-force. As a test of principle, we implement this method using a 4th-order (1+1) code, and calculate the self-force for the simple case of a scalar charge moving in a circular orbit around a Schwarzschild black hole. We achieve agreement with frequency-domain results to ~ 0.1% or better.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 20:59:22 GMT" }, { "version": "v2", "created": "Tue, 15 Jan 2008 14:51:35 GMT" } ]
2010-05-12T00:00:00
[ [ "Vega", "Ian", "" ], [ "Detweiler", "Steven", "" ] ]
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712.4406
Patrick Berghaus
Patrick Berghaus (for the IceCube Collaboration)
Status and Results from AMANDA/IceCube
8 pages, 3 figures
null
null
null
astro-ph
null
IceCube is a cubic kilometer-scale neutrino telescope under construction at the South Pole since the austral summer 2004/2005. At the moment it is taking data with 22 deployed strings. The full detector is expected to be completed in 2011 with up to 80 strings each holding 60 digital optical modules. The progenitor detector AMANDA has been operating at the same site since 1997 and is still running as an integral part of IceCube. A summary of AMANDA science for its 10 years of standalone operations is presented, as well as the status and first physics results of the IceCube project.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 20:54:59 GMT" } ]
2019-08-13T00:00:00
[ [ "Berghaus", "Patrick", "", "for the IceCube Collaboration" ] ]
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801.0001
Melvyn B. Nathanson
Melvyn B. Nathanson
Linear forms and complementing sets of integers
10 pages
Journal de Theorie des Nombres de Bordeaux 21 (2009), 343--355
null
null
math.NT math.CO
null
Let $\varphi(x_1,\ldots,x_h,y) = u_1x_1 + \cdots + u_hx_h+vy$ be a linear form with nonzero integer coefficients $u_1,\ldots, u_h, v.$ Let $\mathcal{A} = (A_1,\ldots, A_h)$ be an $h$-tuple of finite sets of integers and let $B$ be an infinite set of integers. Define the representation function associated to the form $\varphi$ and the sets \mca\ and $B$ as follows: $$ R^{(\varphi)}_{\mathcal{A},B}(n) = \text{card}\left( \left\{ (a_1,\ldots, a_h,b) \in A_1 \times \cdots \times A_h \times B: \varphi(a_1, \ldots , a_h,b ) = n \right\} \right).$$ If this representation function is constant, then the set $B$ is periodic and the period of $B$ will be bounded in terms of the diameter of the finite set $\{ \varphi(a_1,\ldots,a_h,0): (a_1,\ldots, a_h) \in A_1 \times \cdots \times A_h\}.$
[ { "version": "v1", "created": "Wed, 2 Jan 2008 20:48:54 GMT" } ]
2021-12-30T00:00:00
[ [ "Nathanson", "Melvyn B.", "" ] ]
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801.0002
Avon Huxor
A. P. Huxor, N. R. Tanvir, A. M. N. Ferguson, M. J. Irwin, R. Ibata, T. Bridges, G. F. Lewis
Globular clusters in the outer halo of M31: the survey
Accepted to MNRAS
null
10.1111/j.1365-2966.2008.12882.x
null
astro-ph
null
We report the discovery of 40 new globular clusters (GCs) that have been found in surveys of the halo of M31 based on INT/WFC and CHFT/Megacam imagery. A subset of these these new GCs are of an extended, diffuse nature, and include those already found in Huxor et al. (2005). The search strategy is described and basic positional and V and I photometric data are presented for each cluster. For a subset of these clusters, K-band photometry is also given. The new clusters continue to be found to the limit of the survey area (~100 kpc), revealing that the GC system of M31 is much more extended than previously realised. The new clusters increase the total number of confirmed GCs in M31 by approximately 10% and the number of confirmed GCs beyond 1 degree (~14 kpc) by more than 75%. We have also used the survey imagery as well recent HST archival data to update the Revised Bologna Catalogue (RBC) of M31 globular clusters.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 21:06:38 GMT" } ]
2009-11-13T00:00:00
[ [ "Huxor", "A. P.", "" ], [ "Tanvir", "N. R.", "" ], [ "Ferguson", "A. M. N.", "" ], [ "Irwin", "M. J.", "" ], [ "Ibata", "R.", "" ], [ "Bridges", "T.", "" ], [ "Lewis", "G. F.", "" ] ]
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801.0003
Rosemary Harris
Gunter M. Sch\"utz, Fernando Pigeard de Almeida Prado, Rosemary J. Harris, Vladimir Belitsky
Short-time behaviour of demand and price viewed through an exactly solvable model for heterogeneous interacting market agents
26 pages, 3 figures. v2: minor alterations, to appear in Physica A (http://www.elsevier.com/wps/find/journaldescription.cws_home/505702/description#description)
Physica A 388 (2009) 4126-4144
10.1016/j.physa.2009.06.025
null
q-fin.GN cond-mat.stat-mech physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We introduce a stochastic heterogeneous interacting-agent model for the short-time non-equilibrium evolution of excess demand and price in a stylized asset market. We consider a combination of social interaction within peer groups and individually heterogeneous fundamentalist trading decisions which take into account the market price and the perceived fundamental value of the asset. The resulting excess demand is coupled to the market price. Rigorous analysis reveals that this feedback may lead to price oscillations, a single bounce, or monotonic price behaviour. The model is a rare example of an analytically tractable interacting-agent model which allows us to deduce in detail the origin of these different collective patterns. For a natural choice of initial distribution the results are independent of the graph structure that models the peer network of agents whose decisions influence each other.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 21:01:30 GMT" }, { "version": "v2", "created": "Tue, 16 Jun 2009 16:10:15 GMT" } ]
2009-07-20T00:00:00
[ [ "Schütz", "Gunter M.", "" ], [ "Prado", "Fernando Pigeard de Almeida", "" ], [ "Harris", "Rosemary J.", "" ], [ "Belitsky", "Vladimir", "" ] ]
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801.0004
Luca Fabrizio Di Cerbo
Luca Fabrizio Di Cerbo
A Ricci nilsoliton is nongradient
null
null
null
null
math.DG
null
In this brief note, we clarify that a Ricci nilsoliton cannot be of gradient type.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 21:05:18 GMT" } ]
2008-01-03T00:00:00
[ [ "Di Cerbo", "Luca Fabrizio", "" ] ]
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801.0005
Stephen Doty
S. Doty, A. Giaquinto, and J. Sullivan
On the defining relations for generalized q-Schur algebras
33 pages; to appear in "Advances in Math"
null
null
null
math.QA math.RA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We show that the defining relations needed to describe a generalized q-Schur algebra as a quotient of a quantized enveloping algebra are determined completely by the defining ideal of a certain finite affine variety, the points of which correspond bijectively to the set of weights. This explains, unifies, and extends previous results.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 21:09:42 GMT" }, { "version": "v2", "created": "Wed, 30 Apr 2008 01:51:12 GMT" }, { "version": "v3", "created": "Fri, 6 Mar 2009 14:09:29 GMT" } ]
2009-03-06T00:00:00
[ [ "Doty", "S.", "" ], [ "Giaquinto", "A.", "" ], [ "Sullivan", "J.", "" ] ]
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801.0006
Boudewijn Roukema
Boudewijn F. Roukema (1), Zbigniew Bulinski (1), Agnieszka Szaniewska (1), Nicolas E. Gaudin (2,1) ((1) Torun Centre for Astronomy, (2) ENSP, Universite Louis Pasteur)
The optimal phase of the generalised Poincare dodecahedral space hypothesis implied by the spatial cross-correlation function of the WMAP sky maps
20 pages, 22 figures, accepted in Astronomy & Astrophysics, software available at http://adjani.astro.umk.pl/GPLdownload/dodec/ and MCMCs at http://adjani.astro.umk.pl/GPLdownload/MCMC
Astronomy & Astrophysics 486 (2008) 55
10.1051/0004-6361:20079339
null
astro-ph gr-qc
null
Several studies have proposed that the shape of the Universe may be a Poincare dodecahedral space (PDS) rather than an infinite, simply connected, flat space. Both models assume a close to flat FLRW metric of about 30% matter density. We study two predictions of the PDS model. (i) For the correct model, the spatial two-point cross-correlation function, $\ximc$, of temperature fluctuations in the covering space, where the two points in any pair are on different copies of the surface of last scattering (SLS), should be of a similar order of magnitude to the auto-correlation function, $\xisc$, on a single copy of the SLS. (ii) The optimal orientation and identified circle radius for a "generalised" PDS model of arbitrary twist $\phi$, found by maximising $\ximc$ relative to $\xisc$ in the WMAP maps, should yield $\phi \in \{\pm 36\deg\}$. We optimise the cross-correlation at scales < 4.0 h^-1 Gpc using a Markov chain Monte Carlo (MCMC) method over orientation, circle size and $\phi$. Both predictions were satisfied: (i) an optimal "generalised" PDS solution was found, with a strong cross-correlation between points which would be distant and only weakly correlated according to the simply connected hypothesis, for two different foreground-reduced versions of the WMAP 3-year all-sky map, both with and without the kp2 Galaxy mask: the face centres are $(l,b)_{i=1,6}\approx (184d, 62d), (305d, 44d), (46d, 49d), (117d, 20d), (176d, -4d), (240d, 13d) to within ~2d, and their antipodes; (ii) this solution has twist \phi= (+39 \pm 2.5)d, in agreement with the PDS model. The chance of this occurring in the simply connected model, assuming a uniform distribution $\phi \in [0,2\pi]$, is about 6-9%.
[ { "version": "v1", "created": "Wed, 2 Jan 2008 01:16:48 GMT" }, { "version": "v2", "created": "Mon, 12 May 2008 14:10:43 GMT" } ]
2009-11-13T00:00:00
[ [ "Roukema", "Boudewijn F.", "" ], [ "Bulinski", "Zbigniew", "" ], [ "Szaniewska", "Agnieszka", "" ], [ "Gaudin", "Nicolas E.", "" ] ]
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801.0007
Jonathan Barmak
Jonathan Ariel Barmak, Elias Gabriel Minian
One-point reductions of finite spaces, h-regular CW-complexes and collapsibility
We wrote a more detailed introduction. 13 pages, 8 figures
Algebr. Geom. Topol. 8 (2008) 1763-1780
10.2140/agt.2008.8.1763
null
math.AT math.CO math.GT
null
We investigate one-point reduction methods of finite topological spaces. These methods allow one to study homotopy theory of cell complexes by means of elementary moves of their finite models. We also introduce the notion of h-regular CW-complex, generalizing the concept of regular CW-complex, and prove that the h-regular CW-complexes, which are a sort of combinatorial-up-to-homotopy objects, are modeled (up to homotopy) by their associated finite spaces. This is accomplished by generalizing a classical result of McCord on simplicial complexes.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 21:23:51 GMT" }, { "version": "v2", "created": "Fri, 4 Jan 2008 20:34:14 GMT" } ]
2014-10-01T00:00:00
[ [ "Barmak", "Jonathan Ariel", "" ], [ "Minian", "Elias Gabriel", "" ] ]
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801.0008
Ruslan Sharipov
Ruslan Sharipov
A cubic identity for the Infeld-van der Waerden field and its application
AmSTeX, 18 pages, amsppt style
null
null
null
math.DG math-ph math.MP
null
A cubic identity for the Infeld-van der Waerden field is found and its application to verifying an explicit formula for the spinor components of the metric connection is demonstrated.
[ { "version": "v1", "created": "Sun, 30 Dec 2007 21:23:59 GMT" } ]
2008-01-03T00:00:00
[ [ "Sharipov", "Ruslan", "" ] ]
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801.0009
Jean-Paul Blaizot
Jean-Paul Blaizot
Non Perturbative Renormalization Group and Bose-Einstein Condensation
Lectures given at the 2006 ECT* School "Renormalization Group and Effective Field Theory Approaches to Many-Body Systems", Trento, Italy. Late submission to arXiv
null
null
null
cond-mat.stat-mech
null
These lectures are centered around a specific problem, the effect of weak repulsive interactions on the transition temperature $T_c$ of a Bose gas. This problem provides indeed a beautiful illustration of many of the techniques which have been discussed at this school on effective theories and renormalization group. Effective theories are used first in order to obtain a simple hamiltonian describing the atomic interactions: because the typical atomic interaction potentials are short range, and the systems that we consider are dilute, these potentials can be replaced by a contact interaction whose strength is determined by the s-wave scattering length. Effective theories are used next in order to obtain a simple formula for the shift in $T_c$: one exploits there the fact that near $T_c$ the physics is dominated by low momentum modes whose dynamics is most economically described in terms of classical fields; the ingredients needed to calculate the shift of $T_c$ can be obtained from this classical field theory. Finally the renormalization group is used both to obtain a qualitative understanding, and also as a non perturbative tool to evaluate quantitatively the shift in $T_c$.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 22:02:12 GMT" } ]
2008-01-03T00:00:00
[ [ "Blaizot", "Jean-Paul", "" ] ]
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801.001
Eduardo J. Dubuc
Eduardo J. Dubuc
2-filteredness and the point of every Galois topos
5 pages, result presented at CT2007, Cavoeiro
null
null
null
math.CT math.AG
null
A locally connected topos is a Galois topos if the Galois objects generate the topos. We show that the full subcategory of Galois objects in any connected locally connected topos is an inversely 2-filtered 2-category, and as an application of the construction of 2-filtered bi-limits of topoi, we show that every Galois topos has a point.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 22:08:02 GMT" } ]
2008-01-03T00:00:00
[ [ "Dubuc", "Eduardo J.", "" ] ]
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801.0011
Quang-Cuong Pham
Nicolas Tabareau, Jean-Jacques Slotine, Quang-Cuong Pham
How synchronization protects from noise
14 pages, 5 figures
null
null
null
q-bio.NC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Synchronization phenomena are pervasive in biology. In neuronal networks, the mechanisms of synchronization have been extensively studied from both physiological and computational viewpoints. The functional role of synchronization has also attracted much interest and debate. In particular, synchronization may allow distant sites in the brain to communicate and cooperate with each other, and therefore it may play a role in temporal binding and in attention and sensory-motor integration mechanisms. In this article, we study another role for synchronization: the so-called "collective enhancement of precision." We argue, in a full nonlinear dynamical context, that synchronization may help protect interconnected neurons from the influence of random perturbations -- intrinsic neuronal noise -- which affect all neurons in the nervous system. This property may allow reliable computations to be carried out even in the presence of significant noise (as experimentally found e.g., in retinal ganglion cells in primates), as mathematically it is key to obtaining meaningful downstream signals, whether in terms of precisely-timed interaction (temporal coding), population coding, or frequency coding. Using stochastic contraction theory, we show how synchronization of nonlinear dynamical systems helps protect these systems from random perturbations. Our main contribution is a mathematical proof that, under specific quantified conditions, the impact of noise on each individual system and on the spatial mean can essentially be cancelled through synchronization. Similar concepts may be applicable to questions in systems biology.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 22:28:47 GMT" }, { "version": "v2", "created": "Sun, 6 Apr 2008 16:37:38 GMT" }, { "version": "v3", "created": "Thu, 13 Nov 2008 20:56:31 GMT" }, { "version": "v4", "created": "Wed, 1 Apr 2009 04:47:34 GMT" }, { "version": "v5", "created": "Thu, 18 Jun 2009 06:07:40 GMT" } ]
2009-06-18T00:00:00
[ [ "Tabareau", "Nicolas", "" ], [ "Slotine", "Jean-Jacques", "" ], [ "Pham", "Quang-Cuong", "" ] ]
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801.0012
Janos Polonyi
Janos Polonyi
Semiclassical Coulomb field
Final version to appear in Physical Review D, 13 pages, 5 figures
Phys.Rev.D77:125018,2008
10.1103/PhysRevD.77.125018
null
quant-ph
null
The contribution of different modes of the Coulomb field to decoherence and to the dynamical breakdown of the time reversal invariance is calculated in the one-loop approximation for non-relativistic electron gas. The dominant contribution was found to come from the usual collective modes in the plasma, namely the zero-sound and the plasmon oscillations. The length scale of the quantum-classical transition is found to be close to the Thomas-Fermi screening length. It is argued that the extension of these modes to the whole Fock-space yield optimal pointer states.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 23:19:42 GMT" }, { "version": "v2", "created": "Thu, 22 May 2008 11:32:46 GMT" } ]
2010-09-17T00:00:00
[ [ "Polonyi", "Janos", "" ] ]
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801.0013
Carl Henney
C. J. Henney, C. U. Keller, J. W. Harvey, M. K. Georgoulis, N. L. Hadder, A. A. Norton, N.-E. Raouafi, R. M. Toussaint
SOLIS Vector Spectromagnetograph: status and science
4 pages, 2 figures, Solar Polarimetry Workshop 5, PASP
Solar Polarization 5, In ASP Conference Series, Vol. 405, 2009., p.47
null
null
astro-ph
null
The Vector Spectromagnetograph (VSM) instrument has been recording photospheric and chromospheric magnetograms daily since August 2003. Full-disk photospheric vector magnetograms are observed at least weekly and, since November 2006, area-scans of active regions daily. Quick-look vector magnetic images, plus X3D and FITS formated files, are now publicly available daily. In the near future, Milne-Eddington inversion parameter data will also be available and a typical observing day will include three full-disk photospheric vector magnetograms. Besides full-disk observations, the VSM is capable of high temporal cadence area-scans of both the photosphere and chromosphere. Carrington rotation and daily synoptic maps are also available from the photospheric magnetograms and coronal hole estimate images.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 23:20:18 GMT" } ]
2009-08-13T00:00:00
[ [ "Henney", "C. J.", "" ], [ "Keller", "C. U.", "" ], [ "Harvey", "J. W.", "" ], [ "Georgoulis", "M. K.", "" ], [ "Hadder", "N. L.", "" ], [ "Norton", "A. A.", "" ], [ "Raouafi", "N. -E.", "" ], [ "Toussaint", "R. M.", "" ] ]
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801.0014
Horacio E. Castillo
Horacio E. Castillo
Time reparametrization symmetry in spin glass models
v2: Added a more detailed discussion of the physical consequences of the symmetry. (14 pages, no figures) v1: 11 pages, no figures
Phys. Rev. B 78, 214430 (2008)
10.1103/PhysRevB.78.214430
null
cond-mat.dis-nn cond-mat.soft cond-mat.stat-mech
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the long-time aging dynamics of spin-glass models with two-spin interactions by performing a Renormalization Group transformation on the time variable in the non-equilibrium dynamical generating functional. We obtain the RG equations and find that the flow converges to an exact fixed point. We show that this fixed point is invariant under reparametrizations of the time variable. This continuous symmetry is broken, as evidenced by the fact that the observed correlations and responses are not invariant under it. We argue that this gives rise to the presence of Goldstone modes, and that those Goldstone modes shape the behavior of fluctuations in the nonequilibrium dynamics.
[ { "version": "v1", "created": "Sat, 29 Dec 2007 09:31:01 GMT" }, { "version": "v2", "created": "Wed, 13 Aug 2008 21:42:03 GMT" } ]
2009-11-13T00:00:00
[ [ "Castillo", "Horacio E.", "" ] ]
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801.0015
Motohico Mulase
Andrew R. Hodge and Motohico Mulase
Hitchin integrable systems, deformations of spectral curves, and KP-type equations
35 pages. Reference updated
Advanced Studies in Pure Mathematics vol. 59, 31--77 (2010)
null
null
math.AG math-ph math.MP nlin.SI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
An effective family of spectral curves appearing in Hitchin fibrations is determined. Using this family the moduli spaces of stable Higgs bundles on an algebraic curve are embedded into the Sato Grassmannian. We show that the Hitchin integrable system, the natural algebraically completely integrable Hamiltonian system defined on the Higgs moduli space, coincides with the KP equations. It is shown that the Serre duality on these moduli spaces corresponds to the formal adjoint of pseudo-differential operators acting on the Grassmannian. From this fact we then identify the Hitchin integrable system on the moduli space of Sp(2m)-Higgs bundles in terms of a reduction of the KP equations. We also show that the dual Abelian fibration (the SYZ mirror dual) to the Sp(2m)-Higgs moduli space is constructed by taking the symplectic quotient of a Lie algebra action on the moduli space of GL-Higgs bundles.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 23:36:46 GMT" }, { "version": "v2", "created": "Mon, 14 Jan 2008 01:13:22 GMT" }, { "version": "v3", "created": "Fri, 29 Aug 2008 23:13:29 GMT" } ]
2010-10-05T00:00:00
[ [ "Hodge", "Andrew R.", "" ], [ "Mulase", "Motohico", "" ] ]
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801.0016
Jan {\AA}man
Jan E. Aman, Narit Pidokrajt
Ruppeiner Geometry of Black Hole Thermodynamics
5 pages, 2 figures. Talk given at 30th Spanish Relativity Meeting (ERE 2007): Relativistic Astrophysics And Cosmology, 10-14 Sep 2007, Puerto de La Cruz, Tenerife, Spain
null
10.1051/eas:0830042
null
gr-qc
null
The Hessian of the entropy function can be thought of as a metric tensor on state space. In the context of thermodynamical fluctuation theory Ruppeiner has argued that the Riemannian geometry of this metric gives insight into the underlying statistical mechanical system; the claim is supported by numerous examples. We study these geometries for some families of black holes and find that the Ruppeiner geometry is flat for Reissner--Nordstr\"om black holes in any dimension, while curvature singularities occur for the Kerr black holes. Kerr black holes have instead flat Weinhold curvature.
[ { "version": "v1", "created": "Fri, 28 Dec 2007 23:57:11 GMT" } ]
2009-11-13T00:00:00
[ [ "Aman", "Jan E.", "" ], [ "Pidokrajt", "Narit", "" ] ]
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801.0017
Y. M. Pihlstr\"om
Ylva M. Pihlstr\"om, Vincent L. Fish, Lor\'ant O. Sjouwerman, Laura K. Zschaechner, Philip B. Lockett, Moshe Elitzur
Excited-state OH Masers and Supernova Remnants
Accepted to ApJ, 7 pages including 1 table and 4 figures
null
10.1086/529009
null
astro-ph
null
The collisionally pumped, ground-state 1720 MHz maser line of OH is widely recognized as a tracer for shocked regions and observed in star forming regions and supernova remnants. Whereas some lines of excited states of OH have been detected and studied in star forming regions, the subject of excited-state OH in supernova remnants -- where high collision rates are to be expected -- is only recently being addressed. Modeling of collisional excitation of OH demonstrates that 1720, 4765 and 6049 MHz masers can occur under similar conditions in regions of shocked gas. In particular, the 6049 and 4765 MHz masers become more significant at increased OH column densities where the 1720 MHz masers begin to be quenched. In supernova remnants, the detection of excited-state OH line maser emission could therefore serve as a probe of regions of higher column densities. Using the Very Large Array, we searched for excited-state OH in the 4.7, 7.8, 8.2 and 23.8 GHz lines in four well studied supernova remnants with strong 1720 MHz maser emission (SgrAEast, W28, W44 and IC443). No detections were made, at typical detection limits of around 10 mJy/beam. The search for the 6 GHz lines were done using Effelsberg since the VLA receivers did not cover those frequencies, and are reported on in an accompanying letter (Fish, Sjouwerman & Pihlstrom 2007). We also cross-correlated the positions of known supernova remnants with the positions of 1612 MHz maser emission obtained from blind surveys. No probable associations were found, perhaps except in the SgrAEast region. The lack of detections of excited-state OH indicates that the OH column densities suffice for 1720 MHz inversion but not for inversion of excited-state transitions, consistent with the expected results for C-type shocks.
[ { "version": "v1", "created": "Sat, 29 Dec 2007 00:41:39 GMT" } ]
2009-11-13T00:00:00
[ [ "Pihlström", "Ylva M.", "" ], [ "Fish", "Vincent L.", "" ], [ "Sjouwerman", "Loránt O.", "" ], [ "Zschaechner", "Laura K.", "" ], [ "Lockett", "Philip B.", "" ], [ "Elitzur", "Moshe", "" ] ]
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801.0018
Tatsuru Kikuchi
Tatsuru Kikuchi, Nobuchika Okada and Michihisa Takeuchi
Unparticle physics at the photon collider
29 pages, 16 figures; version to appear in Phys. Rev. D
Phys.Rev.D77:094012,2008
10.1103/PhysRevD.77.094012
KEK-TH-1202
hep-ph hep-th
null
Recently, a conceptually new physics beyond the Standard Model (SM), unparticle, has been proposed, where a hidden conformal sector is coupled to the SM sector through higher dimensional operators. In this setup, we investigate unparticle physics at the photon collider, in particular, unparticle effects on the gamma gamma to gamma gamma process. Since this process occurs at loop level in the SM, the unparticle effects can be significant even if the cutoff scale is very high. In fact, we find that the unparticle effects cause sizable deviations from the SM results. The scaling dimension of the unparticle d_U reflects the dependence of the cross section on the final state photon invariant mass, so that precision measurements of this dependence may reveal the scaling dimension of the unparticle.
[ { "version": "v1", "created": "Sat, 29 Dec 2007 01:28:40 GMT" }, { "version": "v2", "created": "Sat, 5 Jan 2008 12:59:24 GMT" }, { "version": "v3", "created": "Thu, 3 Apr 2008 17:27:23 GMT" } ]
2008-11-26T00:00:00
[ [ "Kikuchi", "Tatsuru", "" ], [ "Okada", "Nobuchika", "" ], [ "Takeuchi", "Michihisa", "" ] ]
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801.0019
Changxing Miao
Changxing Miao, Guixiang Xu and Lifeng Zhao
Global well-posedness, scattering and blow-up for the energy-critical, focusing Hartree equation in the radial case
35 pages, 2 figures
Colloquium Mathematicum, 114(2009)213-236
10.4064/cm114-2-5
null
math.AP math-ph math.MP
null
We establish global existence, scattering for radial solutions to the energy-critical focusing Hartree equation with energy and $\dot{H}^1$ norm less than those of the ground state in $\mathbb{R}\times \mathbb{R}^d$, $d\geq 5$.
[ { "version": "v1", "created": "Sat, 29 Dec 2007 01:26:12 GMT" }, { "version": "v2", "created": "Thu, 3 Jan 2008 13:48:09 GMT" } ]
2009-01-11T00:00:00
[ [ "Miao", "Changxing", "" ], [ "Xu", "Guixiang", "" ], [ "Zhao", "Lifeng", "" ] ]
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801.002
Shu Chen
Shu Chen, Li Wang, Yajiang Hao, Yupeng Wang
Intrinsic relation between ground-state fidelity and the characterization of a quantum phase transition
5 pages, 3 figures
Phys. Rev. A 77, 032111 (2008)
10.1103/PhysRevA.77.032111
null
cond-mat.other cond-mat.stat-mech
null
The notion of fidelity in quantum information science has been recently applied to analyze quantum phase transitions from the viewpoint of the ground state (GS) overlap for various many-body systems. In this work, we unveil the intrinsic relation between the GS fidelity and the derivatives of GS energy and find that they play equivalent role in identifying the quantum phase transition. The general connection between the two approaches enables us to understand the different singularity and scaling behaviors of fidelity exhibited in various systems on general grounds. Our general conclusions are illustrated via several quantum spin models which exhibit different kinds of QPTs.
[ { "version": "v1", "created": "Sat, 29 Dec 2007 01:26:48 GMT" }, { "version": "v2", "created": "Tue, 25 Mar 2008 01:12:42 GMT" } ]
2008-03-25T00:00:00
[ [ "Chen", "Shu", "" ], [ "Wang", "Li", "" ], [ "Hao", "Yajiang", "" ], [ "Wang", "Yupeng", "" ] ]
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801.0021
Ming-Ho Siu
M. Stewart Siu, Marvin Weinstein
Bootstrap Approximations in Contractor Renormalization
Some clarifications added for Phys Rev submission
null
10.1103/PhysRevB.77.155116
null
cond-mat.str-el cond-mat.other
null
We propose a bootstrap method for approximating the long-range terms in the Contractor Renormalization (CORE) method. The idea is tested on the 2-D Heisenberg antiferromagnet and the frustrated J_2-J_1 model. We obtain renormalization group flows that directly reveal the Neel phase of the unfrustrated HAF and the existence of a phase transition in the J_2-J_1 model for weak frustration. However, we find that this bootstrap method is dependent on blocking and truncation schemes. For this reason, we discuss these dependencies and unresolved issues that researchers who use this approach must consider.
[ { "version": "v1", "created": "Sat, 29 Dec 2007 01:35:38 GMT" }, { "version": "v2", "created": "Fri, 18 Jan 2008 22:24:56 GMT" }, { "version": "v3", "created": "Fri, 29 Feb 2008 03:48:28 GMT" } ]
2009-11-13T00:00:00
[ [ "Siu", "M. Stewart", "" ], [ "Weinstein", "Marvin", "" ] ]
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801.0022
C. Q. Geng
C. Q. Geng and Y. K. Hsiao
Direct CP and T Violation in Baryonic B Decays
6 pages, Talk given at 4th International Conference on Flavor Physics (ICFP 2007), Beijing, China, 24-28 Sep 2007
Int.J.Mod.Phys.A23:3290-3295,2008
10.1142/S0217751X08041992
null
hep-ph
null
We review the direct CP and T violation in the three-body baryonic B decays in the standard model. In particular, we emphasize that the direct CP violating asymmetry in $B^\pm\to p\bar p K^{*\pm}$ is around 22% and the direct $T$ violating asymmetry in $\bar B^0 \ra \Lambda \bar p \pi^+$ can be as large as 12%, which are accessible to the current B factories at KEK and SLAC as well as SuperB and LHCb.
[ { "version": "v1", "created": "Sat, 29 Dec 2007 01:40:00 GMT" } ]
2008-11-26T00:00:00
[ [ "Geng", "C. Q.", "" ], [ "Hsiao", "Y. K.", "" ] ]
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801.0023
Sheldon Joyner
Sheldon Joyner
On a generalization of Chen's iterated integrals
v3 contains a corrected version of the proof of Theorem 12
J. Number Theory, 130 no.2, Feb 2010, pp. 254-288
null
null
math.NT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Chen's iterated integrals may be generalized by interpolation of functions of the positive integer number of times which particular forms are iterated in integrals along specific paths, to certain complex values. These generalized iterated integrals satisfy both an additive and a (non-classical) multiplicative iterative property, in addition to a comultiplication formula. This theory is developed in the first part of the paper, after which various applications are discussed, including the expression of certain zeta functions as complex iterated integrals (from which an obstruction to the existence of a contour integration proof of the functional equation for the Dedekind zeta function emerges); an elegant reformulation of a result of Gel'fand and Shilov in the theory of distributions which gives a way of thinking about complex iterated derivatives; and a direct topological proof of the monodromy of polylogarithms.
[ { "version": "v1", "created": "Sat, 29 Dec 2007 01:51:37 GMT" }, { "version": "v2", "created": "Tue, 22 Jul 2008 21:51:15 GMT" }, { "version": "v3", "created": "Tue, 24 Aug 2010 17:28:59 GMT" } ]
2010-08-25T00:00:00
[ [ "Joyner", "Sheldon", "" ] ]
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801.0024
C. Q. Geng
C. Q. Geng, S. H. Ho and J. N. Ng
CPT conserving cosmological birefringence
4 pages, Talk given at 4th International Conference on Flavor Physics (ICFP 2007), Beijing, China, 24-28 Sep 2007
Int.J.Mod.Phys.A23:3408-3411,2008
10.1142/S0217751X08042213
null
astro-ph
null
We demonstrate that the cosmological birefringence can arise from CPT conserving effect, originated from the CPT-even dimension-six Chern-Simons-like term. We show that a sizable rotation polarization angle in the data of the cosmic microwave background radiation polarization can be induced.
[ { "version": "v1", "created": "Sat, 29 Dec 2007 01:51:53 GMT" } ]
2009-06-23T00:00:00
[ [ "Geng", "C. Q.", "" ], [ "Ho", "S. H.", "" ], [ "Ng", "J. N.", "" ] ]
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801.0025
Jaime Besprosvany
J. Besprosvany
Cosmology with dark energy decaying through its chemical-potential contribution
7 pages; presented at 2nd International Conference on Quantum Theories and Renormalization Group in Gravity and Cosmology, Barcelona, July, 2006
J.Phys.A40:7099-7104,2007
10.1088/1751-8113/40/25/S68
null
astro-ph
null
The consideration of dark energy's quanta, required also by thermodynamics, introduces its chemical potential into the cosmological equations. Isolating its main contribution, we obtain solutions with dark energy decaying to matter or radiation. When dominant, their energy densities tend asymptotically to a constant ratio, explaining today's dark energy-dark matter coincidence, and in agreement with supernova redshift data.
[ { "version": "v1", "created": "Sat, 29 Dec 2007 01:56:44 GMT" } ]
2008-11-26T00:00:00
[ [ "Besprosvany", "J.", "" ] ]
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801.0026
Hiroyuki Kawamura
Hiroyuki Kawamura, Jiro Kodaira, Kazuhiro Tanaka
Double-spin asymmetries for small-Q_T Drell-Yan pair production in transversely polarized p\bar{p} collisions
18 pages, 8 figures; references added; version to appear in PLB
Phys.Lett.B662:139-149,2008
10.1016/j.physletb.2008.02.056
null
hep-ph
null
We discuss the Drell-Yan process at a measured transverse-momentum $Q_T$ of the produced lepton pair in collisions of transversely polarized protons and antiprotons, to be observed at the proposed spin experiments at GSI. The large logarithmic contributions from multiple soft gluon emission, accompanying the Drell-Yan mechanism at small $Q_T$, are resummed to all orders in QCD perturbation theory up to next-to-leading logarithmic (NLL) accuracy. Numerical evaluation shows the impact of the NLL as well as LL effect on the dilepton $Q_T$ spectra. For the corresponding $Q_T$-dependent spin asymmetry $\aqt$, the LL effect gives significant modification while the NLL effect is marginal, leading to QCD prediction that $\aqt$ at GSI is flat at small and moderate $Q_T$ and almost equals the conventional asymmetry $A_{TT}$ associated with the $Q_T$-integrated cross sections. This flat behavior in turn allows us to use analytic saddle-point evaluation of the resummation formula in the limit $Q_T\to 0$, not only to obtain quantitative estimate of $\aqt$, but also to clarify mechanisms behind the relation $\aqt \simeq A_{TT}$ characteristic of $p\bar{p}$ collisions at GSI.
[ { "version": "v1", "created": "Sat, 29 Dec 2007 05:40:14 GMT" }, { "version": "v2", "created": "Wed, 27 Feb 2008 13:24:31 GMT" } ]
2008-11-26T00:00:00
[ [ "Kawamura", "Hiroyuki", "" ], [ "Kodaira", "Jiro", "" ], [ "Tanaka", "Kazuhiro", "" ] ]
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801.0027
Shi-Jie Xiong
Shi-Jie Xiong and Ye Xiong
Anderson localization of electron states in graphene in different types of disorder
24 pages, 12 figures
Phys. Rev. B, 76, 214204 (2007)
10.1103/PhysRevB.76.214204
null
cond-mat.dis-nn cond-mat.mes-hall
null
Anderson localization of electron states on graphene lattice with diagonal and off-diagonal (OD) disorder in the absence of magnetic field is investigated by using the standard finite-size scaling analysis. In the presence of diagonal disorder all states are localized as predicted by the scaling theory for two-dimensional systems. In the case of OD disorder, the states at the Dirac point (E=0) are shown to be delocalized due to the specific chiral symmetry, although other states ($E \neq 0$) are still localized. In OD disorder the conductance at E=0 in an $M\times L$ rectangular system at the thermodynamical limit is calculated with the transfer-matrix technique for various values of ratio $M/L$ and different types of distribution functions of the OD elements $t_{nn'}$. It is found that if all the $t_{nn'}$'s are positive the conductance is independent of $L/M$ as restricted by 2 delocalized channels at E=0. If the distribution function includes the sign randomness of elements $t_{nn'}$, the conductivity, rather than the conductance, becomes $L/M$ independent. The calculated value of the conductivity is around $\frac{4e^2}{h}$, in consistence with the experiments.
[ { "version": "v1", "created": "Sat, 29 Dec 2007 02:18:25 GMT" } ]
2008-01-03T00:00:00
[ [ "Xiong", "Shi-Jie", "" ], [ "Xiong", "Ye", "" ] ]
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801.0028
Barry Taylor
Peter J. Mohr, Barry N. Taylor, and David B. Newell
CODATA Recommended Values of the Fundamental Physical Constants: 2006
105 pages, 7 figures, 46 tables; describes in detail the 2006 CODATA adjustment of the values of the constants
Rev.Mod.Phys.80:633-730,2008
10.1103//RevModPhys.80.633
null
physics.atom-ph physics.chem-ph physics.data-an
null
This paper gives the 2006 self-consistent set of the basic constants and conversion factors of physics and chemistry recommended by the Committee on Data for Science and Technology (CODATA) for international use. Further, it describes in detail the adjustment of the values of the constants, including the selection of the final set of input data based on the results of least-squares analyses. The 2006 adjustment takes into account the data considered in the 2002 adjustment as well as the data that became available between 31 December 2002, the closing date of that adjustment, and 31 December 2006, the closing date of the new adjustment. The new data have led to a significant reduction in the uncertainties of many recommended values. The 2006 set replaces the previously recommended 2002 CODATA set and also may be found on the World Wide Web at physics.nist.gov/constants.
[ { "version": "v1", "created": "Sat, 29 Dec 2007 02:39:17 GMT" } ]
2012-03-26T00:00:00
[ [ "Mohr", "Peter J.", "" ], [ "Taylor", "Barry N.", "" ], [ "Newell", "David B.", "" ] ]
[ 0.0691158324, 0.0091600707, 0.0764626116, -0.0144244796, 0.0635940582, 0.003489133, -0.0100491708, -0.0838561803, -0.0003842287, -0.016612133, 0.0495088398, 0.0412027724, -0.1376701295, -0.0421152674, 0.1494624019, 0.062704958, 0.0179223865, 0.0854471996, 0.0072297878, 0.0459290408, -0.0736549273, -0.0535799824, -0.0029773156, 0.0057616029, 0.0077503794, -0.0802529827, -0.0408050157, -0.0258540958, 0.038933225, -0.0724382624, 0.0183084439, -0.0431915484, -0.0199930537, -0.0188231859, 0.0042612464, 0.0476838425, 0.0387226492, 0.0161909815, 0.0161207896, -0.0292701125, -0.1094997004, -0.0850728452, -0.030206006, 0.0815164447, -0.0702389106, -0.1227894053, 0.0018147586, -0.0408752076, 0.0264624264, -0.0046356041, -0.0890503973, -0.0358681716, 0.0768837631, 0.0473094843, 0.016097391, 0.111839436, 0.037061438, 0.0307675432, -0.0371550247, -0.0427002013, -0.0339261889, -0.0150562087, -0.0810484961, -0.0274217185, -0.0227188468, 0.0101895556, -0.0769773498, 0.055919718, 0.0528312661, 0.0360553488, -0.0550774112, 0.0966779366, 0.0133014061, -0.0083762594, -0.0181680582, 0.0099848285, 0.022028625, 0.0280300509, -0.0419982821, -0.0107452432, -0.0076860366, 0.0029027364, -0.0442912243, -0.0566684343, -0.0542819016, 0.0291531254, 0.0542819016, -0.0926535875, -0.0762754306, 0.0678523779, -0.0233388785, -0.0623305961, 0.0094993329, 0.0754331276, -0.051240243, -0.1330842525, 0.0770241469, -0.0126111833, 0.1003279313, -0.0103182411, -0.0560133085, -0.0608331673, 0.0404774509, -0.0126930736, 0.1106227711, 0.0991112664, 0.0503043495, -0.1209176183, -0.0301592126, 0.1087509841, -0.0319608077, -0.0054691355, -0.0883484781, 0.0040301974, -0.0653254613, -0.0109850662, -0.104352273, 0.0894247517, -0.0819843858, 0.0042144516, 0.0335284323, 0.0992048532, 0.0950401202, 0.0014557552, 0.0709408298, -0.0470989086, -0.0931215361, -0.1142727658, 0.0353066325, -0.0544222854, 0.0966779366, -0.0336454213, 0.1152086556, -0.0336454213, -0.0824055448, -0.0285681915, -0.0154539635, -0.0638280287, 0.0572299697, -0.0007552964, 0.0118449191, 0.0363829136, -0.0047262688, 0.0874125808, -0.0154071692, 0.0586806089, -0.0408752076, 0.0365700908, -0.0174427405, -0.0022388359, -0.1352367997, 0.000936626, 0.0663549453, -0.0243800618, 0.104352273, -0.0358915664, 0.0805805475, 0.037505988, 0.039564956, -0.011382821, 0.0625177771, -0.0203557126, -0.0690222457, 0.089143984, 0.1105291843, 0.0449463502, -0.0643895641, -0.0749183819, -0.1511470228, -0.074777998, 0.0387226492, -0.0338325985, 0.0535799824, -0.0307675432, 0.0540479273, 0.0684139132, 0.0664953291, -0.034885481, -0.0760882497, -0.0428639837, 0.0557325371, -0.0508190915, 0.0128100608, -0.0807677284, -0.0293870978, -0.0621434189, -0.0058171717, 0.0520825498, 0.0304867756, -0.0591017604, 0.0201334376, 0.0338793956, 0.0590081699, 0.0741228759, -0.0731401816, -0.0284512043, 0.0529248528, -0.1343009174, 0.0728126168, -0.0096455663, 0.0161675829, -0.0297848545, 0.1030420214, -0.1083766222, -0.1110907197, -0.0542351082, -0.0506787077, 0.0413431562, -0.0666825101, -0.0069373208, 0.0175831243, 0.0664017424, -0.0443146229, 0.1972866356, -0.0418812931, -0.031867221, -0.1092189327, 0.0064518251, -0.0217010621, 0.0501171686, -0.0640152097, 0.174076438, 0.1161445528, 0.0712215975, -0.0023704462, -0.0657466128, -0.0131259253, 0.0331540741, 0.0238536205, -0.0056446157, -0.0079434076, -0.0161207896, -0.0439870581, 0.078942731, -0.0175363291, -0.0333880484, -0.013816148, 0.03425375, -0.0639684126, -0.0426066145, 0.0214787871, -0.0116518913, -0.1702392697, 0.0895651355, -0.0213851966, -0.0081130387, 0.0059575555, -0.0180627704, 0.0033399747, 0.0060657687, 0.0537671596, -0.061113935, 0.1343944967, -0.1080958545, -0.0476838425, -0.0312588885 ]
801.0029
Shi-Jie Xiong
Shi-Jie Xiong and Ye Xiong
Vibration Induced Non-adiabatic Geometric Phase and Energy Uncertainty of Fermions in Graphene
9 pages, 5 figures
Europhys. Lett. 80, 60008 (2007)
10.1209/0295-5075/80/60008
null
cond-mat.mes-hall cond-mat.mtrl-sci
null
We investigate geometric phase of fermion states under relative vibrations of two sublattices in graphene by solving time-dependent Sch\"{o}dinger equation using Floquet scheme. In a period of vibration the fermions acquire different geometric phases depending on their momenta. There are two regions in the momentum space: the adiabatic region where the geometric phase can be approximated by the Berry phase and the chaotic region where the geometric phase drastically fluctuates in changing parameters. The energy of fermions due to vibrations shows spikes in the chaotic region. The results suggest a possible dephasing mechanism which may cause classical-like transport properties in graphene.
[ { "version": "v1", "created": "Sat, 29 Dec 2007 02:47:45 GMT" } ]
2008-01-03T00:00:00
[ [ "Xiong", "Shi-Jie", "" ], [ "Xiong", "Ye", "" ] ]
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801.003
Luis Dieulefait
Luis Dieulefait, Jorge Jimenez Urroz
Small primitive roots and malleability of RSA moduli
null
null
null
null
math.NT
null
In a paper of P. Paillier and J. Villar a conjecture is made about the malleability of an RSA modulus. In this paper we present an explicit algorithm refuting the conjecture. Concretely we can factorize an RSA modulus n using very little information on the factorization of a concrete n' coprime to n. However, we believe the conjecture might be true, when imposing some extra conditions on the auxiliary n' allowed to be used. In particular, the paper shows how subtle the notion of malleability is.
[ { "version": "v1", "created": "Sat, 29 Dec 2007 03:16:02 GMT" } ]
2008-01-03T00:00:00
[ [ "Dieulefait", "Luis", "" ], [ "Urroz", "Jorge Jimenez", "" ] ]
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801.0031
Takeshi Nakamori
T. Nakamori, H. kubo, T. Yoshida, T. Tanimori, R. Enomoto, et al (for the CANGAROO-III collaboration)
Observation of an extended VHE gamma-ray emission from MSH 15-52 with CANGAROO-III
9 pages, 9 figures, Accepted in ApJ
null
10.1086/529029
null
astro-ph
null
We have observed the supernova remnant MSH 15-52 (G320.4-1.2), which contains the gamma-ray pulsar PSR B1509-58, using the CANGAROO-III imaging atmospheric Cherenkov telescope array from April to June in 2006. We detected gamma rays above 810 GeV at the 7 sigma level during a total effective exposure of 48.4 hours. We obtained a differential gamma-ray flux at 2.35 TeV of (7.9+/-1.5_{stat}+/-1.7_{sys}) \times 10^{-13} cm^{-2}s^{-1}TeV^{-1} with a photon index of 2.21+/-0.39_{stat}+/-0.40_{sys}, which is compatible with that of the H.E.S.S. observation in 2004. The morphology shows extended emission compared to our Point Spread Function. We consider the plausible origin of the high energy emission based on a multi-wavelength spectral analysis and energetics arguments.
[ { "version": "v1", "created": "Sat, 29 Dec 2007 14:01:00 GMT" } ]
2009-11-13T00:00:00
[ [ "Nakamori", "T.", "" ], [ "kubo", "H.", "" ], [ "Yoshida", "T.", "" ], [ "Tanimori", "T.", "" ], [ "Enomoto", "R.", "" ] ]
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801.0032
Chiang-Mei Chen
Chiang-Mei Chen
Extremal dilatonic black holes in 4D Gauss-Bonnet gravity
4 pages, contribution to the proceedings of the 8th Asia-Pacific International Conference on Gravitation and Astrophysics (ICGA8)
Prog.Theor.Phys.Suppl.172:161-164,2008
10.1143/PTPS.172.161
null
hep-th
null
This is a report of our recent investigation on the extremal dilatonic black holes in four dimensional Gauss-Bonnet gravity. We found that a global solution can exist only when the dilaton coupling is less than a critical value which can be determined numerically. Moreover, the black hole horizon is stretched by the Gauss-Bonnet correction and the entropy is twice the value given by Bekenstein-Hawking formula.
[ { "version": "v1", "created": "Sat, 29 Dec 2007 04:37:26 GMT" } ]
2008-11-26T00:00:00
[ [ "Chen", "Chiang-Mei", "" ] ]
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801.0033
Gabriella B\"ohm
Gabriella B\"ohm and Dragos Stefan
Examples of para-cocyclic objects induced by BD-laws
22 pages, 8 eps figures
Algebr. Represent. Theory 12 (2009), no. 2-5, 153-180
10.1007/s10468-009-9160-7
null
math.KT math.QA
null
In a recent paper arXiv:0705.3190, we gave a general construction of a para-cocyclic structure on a cosimplex, associated to a so called admissible septuple -- consisting of two categories, three functors and two natural transformations, subject to compatibility relations. The main examples of such admissible septuples were induced by algebra homomorphisms. In this note we provide more general examples coming from appropriate (`locally braided') morphisms of monads.
[ { "version": "v1", "created": "Sat, 29 Dec 2007 07:24:03 GMT" } ]
2012-01-27T00:00:00
[ [ "Böhm", "Gabriella", "" ], [ "Stefan", "Dragos", "" ] ]
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801.0034
Kouji Kashiwa
Yuji Sakai, Kouji Kashiwa, Hiroaki Kouno, Masanobu Yahiro
Polyakov loop extended NJL model with imaginary chemical potential
5 pages, 5 figures
Phys.Rev.D77:051901,2008
10.1103/PhysRevD.77.051901
null
hep-ph hep-lat hep-th nucl-th
null
The Polyakov loop extended Nambu--Jona-Lasinio (PNJL) model with imaginary chemical potential is studied. The model possesses the extended ${\mathbb Z}_{3}$ symmetry that QCD does. Quantities invariant under the extended ${\mathbb Z}_{3}$ symmetry, such as the partition function, the chiral condensate and the modified Polyakov loop, have the Roberge-Weiss (RW) periodicity. The phase diagram of confinement/deconfinement transition derived with the PNJL model is consistent with the RW prediction on it and the results of lattice QCD. The phase diagram of chiral transition is also presented by the PNJL model.
[ { "version": "v1", "created": "Sat, 29 Dec 2007 07:14:58 GMT" } ]
2008-11-26T00:00:00
[ [ "Sakai", "Yuji", "" ], [ "Kashiwa", "Kouji", "" ], [ "Kouno", "Hiroaki", "" ], [ "Yahiro", "Masanobu", "" ] ]
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801.0035
Yi-Fei Wang
Yi-Fei Wang, Yang Zhao, and Chang-De Gong
Four-Step Evolution of Spin-Hall Conductance: Tight-Binding Electrons with Rashba Coupling in a Magnetic Field
4 pages, 5 figures
Phys. Rev. B 78, 045301 (2008)
10.1103/PhysRevB.78.045301
null
cond-mat.mes-hall cond-mat.mtrl-sci
null
An intriguing magneto-transport property is demonstrated by tight-binding lattice electrons with Rashba spin-orbit coupling (SOC) in a magnetic field. With the flux strength $\phi={2\pi/N}$ ($N$ is an integer) and the Zeeman splitting fixed, when increasing the Rashba SOC $\lambda$, the spin-Hall and charge-Hall conductances (SHC and CHC) undergo four-step evolutions: the SHC shows size-dependent resonances and jumps at three critical $\lambda_{c}$'s, and changes its sign at $\lambda_{c1}$ and $\lambda_{c3}$; while the CHC exhibits three quantum jumps by $-Ne^2/h$, $+2Ne^2/h$ and $-Ne^2/h$. Such four-step evolutions are also reflected in topological characters and spin polarizations of edge states of a cylindrical system, and are robust against weak disorder.
[ { "version": "v1", "created": "Sat, 29 Dec 2007 07:53:49 GMT" } ]
2008-07-09T00:00:00
[ [ "Wang", "Yi-Fei", "" ], [ "Zhao", "Yang", "" ], [ "Gong", "Chang-De", "" ] ]
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801.0036
Adrian Palcu
Adrian Palcu
Charged and Neutral Currents in a 3-3-1 Model with Right-Handed Neutrinos
14 pages, 1 Table, no figures
Mod.Phys.Lett. A23 (2008) 387-399
10.1142/S0217732308026509
null
hep-ph
null
The charged and the neutral currents are obtained by using a formal algebraical approach (developed and applied by the author) within the exact solution of a 3-3-1 gauge model with right-handed neutrinos. The entire Standard Model phenomenology is recovered without imposing any supplemental condition, but only by choosing an adecquate set of parameters from the very beginning of the calculus. A new and rich phenomenology regarding the particles and their currents occurs as well. The appealing feature of our results resides in the exact expressions of the currents which need not the adjustment usually due to the small mixing angle $\phi$ between neutral bosons $Z$ and $Z^{\prime}$ (like in the most of the papers in the literature treating the same issue). The required mixing was considered and aleready performed as an intermediate step by the solving method itself, since the physical eigenstates of those bosons were determined and then identified in the neutral currents.
[ { "version": "v1", "created": "Sat, 29 Dec 2007 08:26:32 GMT" } ]
2009-02-24T00:00:00
[ [ "Palcu", "Adrian", "" ] ]
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801.0037
Viktor Maslov Professor
V. P. Maslov
Quasithermodynamics and a Correction to the Stefan--Boltzmann Law
Latex, 9pages
null
10.1007/s11232-008-0015-x
null
math-ph math.MP
null
We provide a correction to the Stefan--Boltzmann law and discuss the problem of a phase transition from the superfluid state into the normal state.
[ { "version": "v1", "created": "Sat, 29 Dec 2007 08:43:13 GMT" } ]
2009-11-13T00:00:00
[ [ "Maslov", "V. P.", "" ] ]
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801.0038
Patricia Whitelock
John Menzies, Michael Feast, Patricia Whitelock, Enrico Olivier, Noriyuki Matsunaga and Gary Da Costa
Asymptotic Giant Branch Stars in the Phoenix Dwarf Galaxy
9 Pages, 7 figures, accepted for MNRAS
null
10.1111/j.1365-2966.2008.12907.x
null
astro-ph
null
JHKs near-infrared photometry of stars in the Phoenix dwarf galaxy is presented and discussed. Combining these data with the optical photometry of Massey et al. allows a rather clean separation of field stars from Phoenix members. The discovery of a Mira variable (P = 425 days), which is almost certainly a carbon star, leads to an estimate of the distance modulus of 23.10+/-0.18 that is consistent with other estimates and indicates the existence of a significant population of age ~2 Gyr. The two carbon stars of Da Costa have M{bol} = -3.8 and are consistent with belonging to a population of similar age; some other possible members of such a population are identified. A Da Costa non-carbon star is Delta Ks~0.3 mag brighter than these two carbon stars. It may be an AGB star of the dominant old population. The nature of other stars lying close to it in the Ks,(J-Ks) diagram needs studying.
[ { "version": "v1", "created": "Sat, 29 Dec 2007 09:15:43 GMT" } ]
2009-11-13T00:00:00
[ [ "Menzies", "John", "" ], [ "Feast", "Michael", "" ], [ "Whitelock", "Patricia", "" ], [ "Olivier", "Enrico", "" ], [ "Matsunaga", "Noriyuki", "" ], [ "Da Costa", "Gary", "" ] ]
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801.0039
Mikio Morii
M. Morii, S. Kitamoto, N. Shibazaki, D. Takei, N. Kawai, M. Arimoto, M. Ueno, Y. Terada, T. Kohmura, S. Yamauchi
Suzaku Observation of AXP 1E 1841-045 in SNR Kes 73
To appear in the proceedings of the "40 Years of Pulsars: Millisecond Pulsars, Magnetars and More" conference, held 12-17 August 2007, in Montreal QC (AIP, in press, eds: C. Bassa, Z. Wang, A. Cumming, V. Kaspi)
AIP Conf.Proc.983:268-270,2008
10.1063/1.2900159
null
astro-ph
null
Anomalous X-ray pulsars (AXPs) are thought to be magnetars, which are neutron stars with ultra strong magnetic field of $10^{14}$-- $10^{15}$ G. Their energy spectra below $\sim$10 keV are modeled well by two components consisting of a blackbody (BB) ($\sim$0.4 keV) and rather steep power-law (POW) function (photon index $\sim$2-4). Kuiper et al.(2004) discovered hard X-ray component above $\sim$10 keV from some AXPs. Here, we present the Suzaku observation of the AXP 1E 1841-045 at the center of supernova remnant Kes 73. By this observation, we could analyze the spectrum from 0.4 to 50 keV at the same time. Then, we could test whether the spectral model above was valid or not in this wide energy range. We found that there were residual in the spectral fits when fit by the model of BB + POW. Fits were improved by adding another BB or POW component. But the meaning of each component became ambiguous in the phase-resolved spectroscopy. Alternatively we found that NPEX model fit well for both phase-averaged spectrum and phase-resolved spectra. In this case, the photon indices were constant during all phase, and spectral variation seemed to be very clear. This fact suggests somewhat fundamental meaning for the emission from magnetars.
[ { "version": "v1", "created": "Sat, 29 Dec 2007 09:21:25 GMT" } ]
2009-06-23T00:00:00
[ [ "Morii", "M.", "" ], [ "Kitamoto", "S.", "" ], [ "Shibazaki", "N.", "" ], [ "Takei", "D.", "" ], [ "Kawai", "N.", "" ], [ "Arimoto", "M.", "" ], [ "Ueno", "M.", "" ], [ "Terada", "Y.", "" ], [ "Kohmura", "T.", "" ], [ "Yamauchi", "S.", "" ] ]
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801.004
Tao Wang
Miao Li, Tower Wang, Yi Wang
General Single Field Inflation with Large Positive Non-Gaussianity
27 pages, 3 figure; final version published in JCAP
JCAP 0803:028,2008
10.1088/1475-7516/2008/03/028
USTC-ICTS-07-25
astro-ph gr-qc hep-th
null
Recent analysis of the WMAP three year data suggests $f_{NL}^{local}\simeq86.8$ in the WMAP convention. It is necessary to make sure whether general single field inflation can produce a large positive $f_{NL}$ before turning to other scenarios. We give some examples to generate a large positive $f_{NL}^{equil}$ in general single field inflation. Our models are different from ghost inflation. Due to the appearance of non-conventional kinetic terms, $f_{NL}^{equil}\gg1$ can be realized in single field inflation.
[ { "version": "v1", "created": "Sat, 29 Dec 2007 09:33:13 GMT" }, { "version": "v2", "created": "Wed, 9 Jan 2008 15:52:50 GMT" }, { "version": "v3", "created": "Sat, 29 Mar 2008 13:35:18 GMT" } ]
2009-06-23T00:00:00
[ [ "Li", "Miao", "" ], [ "Wang", "Tower", "" ], [ "Wang", "Yi", "" ] ]
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801.0041
Nick Kersting
P. Huang, N. Kersting, H.H. Yang
Extracting MSSM Masses From Heavy Higgs Decays to Four Leptons at the LHC
version to be published in PRD
Phys.Rev.D77:075011,2008
10.1103/PhysRevD.77.075011
SCUPHY-TH-08001
hep-ph
null
It is well known that finding and measuring the masses of particles in the Minimal Supersymmetric Standard Model (MSSM) at the Large Hadron Collider (LHC) may be possible using invariant mass distributions in exclusive channels containing n_j jets and n_l leptons. We perform this analysis for the (n_j, n_l) = (0,4) decay of heavy Higgs bosons to neutralinos, pp \to H/A \to \chi_i \chi_j (i,j =2,3,4), which then decay to four leptons and two lightest neutralinos \chi_1 via on-shell sleptons. When i=j and the sleptons are degenerate, our Monte Carlo study shows that the LHC will be able to measure the Higgs and relevant neutralino and slepton masses to roughly 30%; however, if one of these is already known within 5%, the other three may be found to equal or better accuracy. This would provide the first accurate measurement of the H/A mass via invariant mass distribution techniques.
[ { "version": "v1", "created": "Sat, 29 Dec 2007 14:12:19 GMT" }, { "version": "v2", "created": "Thu, 10 Jan 2008 18:03:07 GMT" }, { "version": "v3", "created": "Tue, 11 Mar 2008 13:55:55 GMT" } ]
2008-11-26T00:00:00
[ [ "Huang", "P.", "" ], [ "Kersting", "N.", "" ], [ "Yang", "H. H.", "" ] ]
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801.0042
Michael Skeide
B. V. Rajarama Bhat, Volkmar Liebscher, Michael Skeide
A Problem of Powers and the Product of Spatial Product Systems
Contribution to the proceedings of nthe 28th Quantum Probability Confernece, Sep 2-8, 2007, in Guanajuato, Mexico
Number XXIII in Quantum Probability and White Noise Analysis, pages 93-106. World Scientific, 2008
null
null
math.OA
null
In the 2002 AMS summer conference on ``Advances in Quantum Dynamics'' in Mount Holyoke Robert Powers proposed a sum operation for spatial E0-semigroups. Still during the conference Skeide showed that the Arveson system of that sum is the product of spatial Arveson systems. This product may but need not coincide with the tensor product of Arveson systems. The Powers sum of two spatial E0-semigroups is, therefore, up to cocycle conjugacy Skeide's product of spatial noises.
[ { "version": "v1", "created": "Sat, 29 Dec 2007 09:59:46 GMT" } ]
2013-11-20T00:00:00
[ [ "Bhat", "B. V. Rajarama", "" ], [ "Liebscher", "Volkmar", "" ], [ "Skeide", "Michael", "" ] ]
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801.0043
Dmitry Makarov
D. Makarov, I. Karachentsev
Dark Matter Problem in the Local Supercluster
2 pages, 3 figures. To appear in the proceedings of the IAU Symposium 244 "Dark Galaxies and Lost Baryons", Cardiff 25-29 June 2007, eds. J.I. Davies & M.J. Disney
null
10.1017/S1743921307014329
null
astro-ph
null
The Local Supercluster is an ideal laboratory to study distribution of luminous and dark matter in the nearby Universe. The 1100 small groups have been selected using algorithm based on assumption that a total energy of physical pair of galaxies must be negative. The properties of the groups have been considered.
[ { "version": "v1", "created": "Sat, 29 Dec 2007 10:30:17 GMT" } ]
2009-11-13T00:00:00
[ [ "Makarov", "D.", "" ], [ "Karachentsev", "I.", "" ] ]
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801.0044
Vladimir Burdyuzha
V.Burdyuzha, G.Vereshkov, J.Pacheco
Cosmology of gravitational vacuum
8 pages, Preprint of Lebedev Physical Institute No 9, 2003
null
null
null
gr-qc
null
Production of gravitational vacuum defects and their contribution to the energy density of our Universe are discussed. These topological microstructures (defects) could be produced in the result of creation of the Universe from "nothing" when a gravitational vacuum condensate has appeared. They must be isotropically distributed over the isotropic expanding Universe. After Universe inflation these microdefects are smoothed, stretched and broken up. A part of them could survive and now they are perceived as the structures of Lambda-term and an unclustered dark matter. It is shown that the parametrization noninvariance of the Wheeler-De Witt equation can be used to describe phenomenologically vacuum topological defects of different dimensions (worm-holes, micromembranes, microstrings and monopoles). The mathematical illustration of these processes may be the spontaneous breaking of the local Lorentz-invariance of the quasi-classical equations of gravity. Probably the gravitational vacuum condensate has fixed time in our Universe. Besides, 3-dimensional topological defects renormalize Lambda-term.
[ { "version": "v1", "created": "Sat, 29 Dec 2007 10:45:45 GMT" } ]
2008-01-03T00:00:00
[ [ "Burdyuzha", "V.", "" ], [ "Vereshkov", "G.", "" ], [ "Pacheco", "J.", "" ] ]
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801.0045
Peter Zeiler Skands
B. C. Allanach, C. Balazs, G. Belanger, M. Bernhardt, F. Boudjema, D. Choudhury, K. Desch, U. Ellwanger, P. Gambino, R. Godbole, T. Goto, J. Guasch, M. Guchait, T. Hahn, S. Heinemeyer, C. Hugonie, T. Hurth, S. Kraml S.Kreiss, J. Lykken, F. Moortgat, S. Moretti, S. Penaranda, T. Plehn, W. Porod, A. Pukhov, P. Richardson, M. Schumacher, L. Silvestrini, P. Skands, P. Slavich, M. Spira, G. Weiglein, P. Wienemann
SUSY Les Houches Accord 2
35 pages
Comp.Phys.Commun.180:8-25,2009
10.1016/j.cpc.2008.08.004
FERMILAB-PUB-07-036-T, SLAC-PUB-12765, CERN-PH-TH/2007-148, DAMTP-2007-76, Edinburgh 2007/31, KEK-TH-1170,LAPTH-1204/07, LPT-ORSAY-07-81, SHEP-07-13
hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The Supersymmetry Les Houches Accord (SLHA) provides a universal set of conventions for conveying spectral and decay information for supersymmetry analysis problems in high energy physics. Here, we propose extensions of the conventions of the first SLHA to include various generalisations: the minimal supersymmetric standard model with violation of CP, R-parity, and flavour, as well as the simplest next-to-minimal model.
[ { "version": "v1", "created": "Sat, 29 Dec 2007 10:53:21 GMT" }, { "version": "v2", "created": "Tue, 23 Sep 2008 15:22:08 GMT" }, { "version": "v3", "created": "Sun, 22 Nov 2009 23:01:24 GMT" } ]
2009-11-23T00:00:00
[ [ "Allanach", "B. C.", "" ], [ "Balazs", "C.", "" ], [ "Belanger", "G.", "" ], [ "Bernhardt", "M.", "" ], [ "Boudjema", "F.", "" ], [ "Choudhury", "D.", "" ], [ "Desch", "K.", "" ], [ "Ellwanger", "U.", "" ], [ "Gambino", "P.", "" ], [ "Godbole", "R.", "" ], [ "Goto", "T.", "" ], [ "Guasch", "J.", "" ], [ "Guchait", "M.", "" ], [ "Hahn", "T.", "" ], [ "Heinemeyer", "S.", "" ], [ "Hugonie", "C.", "" ], [ "Hurth", "T.", "" ], [ "Kreiss", "S. Kraml S.", "" ], [ "Lykken", "J.", "" ], [ "Moortgat", "F.", "" ], [ "Moretti", "S.", "" ], [ "Penaranda", "S.", "" ], [ "Plehn", "T.", "" ], [ "Porod", "W.", "" ], [ "Pukhov", "A.", "" ], [ "Richardson", "P.", "" ], [ "Schumacher", "M.", "" ], [ "Silvestrini", "L.", "" ], [ "Skands", "P.", "" ], [ "Slavich", "P.", "" ], [ "Spira", "M.", "" ], [ "Weiglein", "G.", "" ], [ "Wienemann", "P.", "" ] ]
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801.0046
H. Geiges
Hansj\"org Geiges
A contact geometric proof of the Whitney-Graustein theorem
7 pages
Enseign. Math. (2) 55 (2009), 93-102
null
null
math.GT math.SG
null
The Whitney-Graustein theorem states that regular closed curves in the 2-plane are classified, up to regular homotopy, by their rotation number. Here we give a simple proof based on contact geometry.
[ { "version": "v1", "created": "Sat, 29 Dec 2007 10:57:08 GMT" } ]
2009-06-29T00:00:00
[ [ "Geiges", "Hansjörg", "" ] ]
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801.0047
Vladimir Burdyuzha
V.Burdyuzha
When did vacuum energy of the Universe become cosmological constant?
3 pages. submitted to Phys. Letters
null
null
null
hep-ph
null
A quark-gluon phase transition in the Universe is researched after which vacuum (dark) energy has hardened and become cosmological constant. Before this a vacuum component of the Universe was changing by jumps during phase transitions since vacuum condensates of quantum fields carried a negative contribution in its positive density energy. This quintessence period of the Universe life took place during the first parts of a second when our Universe was losing high symmetry. Using Zel'dovich's formula the modern value of vacuum energy is also calculated. It is shown that a quantum chromodynamical vacuum which is characterized by pseudogoldstone bosons existed definitely when temperature of the Universe was T~150 MeV. Therefore there is a large probability that dark energy is vacuum energy.
[ { "version": "v1", "created": "Sat, 29 Dec 2007 10:58:14 GMT" } ]
2008-01-03T00:00:00
[ [ "Burdyuzha", "V.", "" ] ]
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801.0048
Keith S Cover
Keith S Cover
A robust and reliable method for detecting signals of interest in multiexponential decays
23 pages with 8 figures
Rev Sci Instrum 79:055106, 2008
10.1063/1.2930799
null
physics.gen-ph physics.data-an physics.med-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The concept of rejecting the null hypothesis for definitively detecting a signal was extended to relaxation spectrum space for multiexponential reconstruction. The novel test was applied to the problem of detecting the myelin signal, which is believed to have a time constant below 40ms, in T2 decays from MRI's of the human brain. It was demonstrated that the test allowed the detection of a signal in a relaxation spectrum using only the information in the data, thus avoiding any potentially unreliable prior information. The test was implemented both explicitly and implicitly for simulated T2 measurements. For the explicit implementation, the null hypothesis was that a relaxation spectrum existed that had no signal below 40ms and that was consistent with the T2 decay. The confidence level by which the null hypothesis could be rejected gave the confidence level that there was signal below the 40ms time constant. The explicit implementation assessed the test's performance with and without prior information where the prior information was the nonnegative relaxation spectrum assumption. The test was also implemented implicitly with a data conserving multiexponential reconstruction algorithm that used left invertible matrices and that has been published previously. The implicit and explicit implementations demonstrated similar characteristics in detecting the myelin signal in both the simulated and experimental T2 decays, providing additional evidence to support the close link between the two tests. [Full abstract in paper]
[ { "version": "v1", "created": "Sat, 29 Dec 2007 10:58:32 GMT" }, { "version": "v2", "created": "Mon, 30 Jun 2008 09:10:05 GMT" } ]
2009-11-13T00:00:00
[ [ "Cover", "Keith S", "" ] ]
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801.0049
H. Geiges
Hansj\"org Geiges
Horizontal loops in Engel space
4 pages
Math. Ann. 342 (2008), 291-296
null
null
math.GT math.SG
null
A simple proof is given of the following result first observed by J. Adachi: embedded circles tangent to the standard Engel structure on Euclidean 4-space are classified, up to isotopy via such embeddings, by their rotation number.
[ { "version": "v1", "created": "Sat, 29 Dec 2007 11:13:23 GMT" } ]
2008-09-29T00:00:00
[ [ "Geiges", "Hansjörg", "" ] ]
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801.005
Takeru Ken Suzuki
Takeru K. Suzuki
Evolution of Alfven wave-driven solar winds to red giants
7 pages, 4 figures embedded, a contribution talk in IAUSymp 247
null
10.1017/S1743921308014889
null
astro-ph
null
In this talk we introduce our recent results of global 1D MHD simulations for the acceleration of solar and stellar winds. We impose transverse photospheric motions corresponding to the granulations, which generate outgoing Alfven waves. The Alfven waves effectively dissipate by 3-wave coupling and direct mode conversion to compressive waves in density-stratified atmosphere. We show that the coronal heating and the solar wind acceleration in the open magnetic field regions are natural consequence of the footpoint fluctuations of the magnetic fields at the surface (photosphere). We also discuss winds from red giant stars driven by \Alfven waves, focusing on different aspects from the solar wind. We show that red giants wind are highly structured with intermittent magnetized hot bubbles embedded in cool chromospheric material.
[ { "version": "v1", "created": "Sat, 29 Dec 2007 11:13:52 GMT" } ]
2009-11-13T00:00:00
[ [ "Suzuki", "Takeru K.", "" ] ]
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801.0051
Giedrius Alkauskas
Giedrius Alkauskas
The moments of Minkowski question mark function: the dyadic period function
26 pages, 1 figure (submitted). The current paper is an essential revision of the previous version (September 2006-May 2007). Some results from an article arXiv:0801.0054 were merged into a new version
Glasgow Mathematical Journal 52 (1) (2010), 41-64.
10.1017/S0017089509990152
null
math.NT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The Minkowski question mark function ?(x) arises as a real distribution of rationals in the Farey tree. We examine the generating function of moments of ?(x). It appears that the generating function is a direct dyadic analogue of period functions for Maass wave forms and it is defined in the cut plane C(0,infinity). The exponential generating function satisfies the integral equation with kernel being the Bessel function. The solution of this integral equation leads to the definition of dyadic eigenfunctions, arising from a certain Hilbert-Schmidt operator. Finally, we describe p-adic distribution of rationals in the Stern-Brocot tree. Surprisingly, the Eisenstein series G_1(z) does manifest in both real and p-adic cases.
[ { "version": "v1", "created": "Sat, 29 Dec 2007 13:32:05 GMT" }, { "version": "v2", "created": "Mon, 13 Oct 2008 10:17:13 GMT" } ]
2009-12-05T00:00:00
[ [ "Alkauskas", "Giedrius", "" ] ]
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801.0052
Vladimir Burdyuzha
V.Burdyuzha, G.Vereshkov
Cosmology of Vacuum
8 pages
Astrophys.Space Sci.305:235-239,2006
10.1007/s10509-006-9197-6
null
astro-ph
null
Shortly the vacuum component of the Universe from the geometry point of view and from the point of view of the standard model of physics of elementary particles is discussed. Some arguments are given to the calculated value of the cosmological constant (Zeldovich approximation). A new component of space vacuum (the gravitational vacuum condensate) is involved the production of which has fixed time in our Universe. Also the phenomenon of vacuum selforganization must be included in physical consideration of the Universe evolution.
[ { "version": "v1", "created": "Sat, 29 Dec 2007 11:18:12 GMT" } ]
2009-12-15T00:00:00
[ [ "Burdyuzha", "V.", "" ], [ "Vereshkov", "G.", "" ] ]
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801.0053
Sangara narayanan M V Dr
Richa Sethi and M. V. Sangaranarayanan
Non-Equilibrium Thermodynamics formalism for Marcus cross-exchange electron transfer reaction rates
9 pages
null
null
null
physics.chem-ph
null
The cross-exchange electron transfer expression arising from Marcus theory is deduced using Onsager's non-equilibrium Thermodynamics formalism.
[ { "version": "v1", "created": "Sat, 29 Dec 2007 11:21:47 GMT" } ]
2008-01-03T00:00:00
[ [ "Sethi", "Richa", "" ], [ "Sangaranarayanan", "M. V.", "" ] ]
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801.0054
Giedrius Alkauskas
Giedrius Alkauskas, J\"orn Steuding
Statistical properties of the Calkin--Wilf tree: real an p-adic distribution
19 pages (preprint). Some results of this paper are already well-known, some (p-adic distribution and properties of the moments) are new and will be merged into paper arXiv:0801.0051
null
null
null
math.NT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We examine statistical properties of the Calkin--Wilf tree and give number-theoretical applications.
[ { "version": "v1", "created": "Sat, 29 Dec 2007 11:31:42 GMT" }, { "version": "v2", "created": "Tue, 23 Sep 2008 11:22:23 GMT" } ]
2008-09-23T00:00:00
[ [ "Alkauskas", "Giedrius", "" ], [ "Steuding", "Jörn", "" ] ]
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801.0055
Denis Krotov
Denis Krotov (Sobolev Institute of Mathematics, Novosibirsk, Russia), Vladimir Potapov (Sobolev Institute of Mathematics, Novosibirsk, Russia)
On connection between reducibility of an n-ary quasigroup and that of its retracts
English: 19pp; Russian: 20pp. V.2: case n=4 added, Russian translation added, title changed (old title: On reducibility of n-ary quasigroups, II)
Discrete Math. 311(1) 2011, 58-66
10.1016/j.disc.2010.09.023
null
math.CO math.GR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
An $n$-ary operation $Q:S^n\to S$ is called an $n$-ary quasigroup of order $|S|$ if in the equation $x_0=Q(x_1,...,x_n)$ knowledge of any $n$ elements of $x_0,...,x_n$ uniquely specifies the remaining one. An $n$-ary quasigroup $Q$ is (permutably) reducible if $Q(x_1,...,x_n)=P(R(x_{s(1)},...,x_{s(k)}),x_{s(k+1)},...,x_{s(n)})$ where $P$ and $R$ are $(n-k+1)$-ary and $k$-ary quasigroups, $s$ is a permutation, and $1<k<n$. An $m$-ary quasigroup $R$ is called a retract of $Q$ if it can be obtained from $Q$ or one of its inverses by fixing $n-m>0$ arguments. We show that every irreducible $n$-ary quasigroup has an irreducible $(n-1)$-ary or $(n-2)$-ary retract; moreover, if the order is finite and prime, then it has an irreducible $(n-1)$-ary retract. We apply this result to show that all $n$-ary quasigroups of order 5 or 7 whose all binary retracts are isotopic to $Z_5$ or $Z_7$ are reducible for $n>3$. Keywords: $n$-ary quasigroups, retracts, reducibility, latin hypercubes
[ { "version": "v1", "created": "Tue, 1 Jan 2008 09:11:32 GMT" }, { "version": "v2", "created": "Wed, 8 Jun 2011 03:09:00 GMT" } ]
2011-06-09T00:00:00
[ [ "Krotov", "Denis", "", "Sobolev Institute of Mathematics, Novosibirsk, Russia" ], [ "Potapov", "Vladimir", "", "Sobolev Institute of Mathematics, Novosibirsk, Russia" ] ]
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801.0056
Giedrius Alkauskas
Giedrius Alkauskas
Generating and zeta functions, structure, spectral and analytic properties of the moments of Minkowski question mark function
34 pages, 4 figures (submitted 01/2008). Minor revisions and typos. A graph of dyadic zeta function on the critical line was added. Theorem 3 was strengthened
Involve, a Journal of Mathematics Vol. 2 (2009), No. 2, 121-159
10.2140/involve.2009.2.121
null
math.NT
null
In this paper we are interested in moments of Minkowski question mark function ?(x). It appears that, to certain extent, the results are analogous to the results obtained for objects associated with Maass wave forms: period functions, L-series, distributions, spectral properties. These objects can be naturally defined for ?(x) as well. Despite the fact that there are various nice results about the nature of ?(x), these investigations are mainly motivated from the perspective of metric number theory, Hausdorff dimension, singularity and generalizations. In this work it is shown that analytic and spectral properties of various integral transforms of ?(x) do reveal significant information about the question mark function. We prove asymptotic and structural results about the moments, calculate certain integrals involving ?(x), define an associated zeta function, generating functions, Fourier series, and establish intrinsic relations among these objects. At the end of the paper it is shown that certain object associated with ?(x) establish a bridge between realms of imaginary and real quadratic irrationals.
[ { "version": "v1", "created": "Sat, 29 Dec 2007 12:01:49 GMT" }, { "version": "v2", "created": "Tue, 27 May 2008 14:37:57 GMT" } ]
2010-11-17T00:00:00
[ [ "Alkauskas", "Giedrius", "" ] ]
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801.0057
Alexander Flanchik B
V.M.Kontorovich and A.B.Flanchik
On the connection between gamma and radio radiation spectra in pulsars
15 pages, 3 figures, Russian version accepted to JETP, partly published in JETP Letters, Vol. 85, #6 (2007)
J.Exp.Theor.Phys.106:869-877,2008
10.1134/S106377610805004X
null
astro-ph
null
The model of pulsar radio emission is discussed in which a coherent radio emis-sion is excited in a vacuum gap above polar cap of neutron star. Pulsar X and gamma radiation are considered as the result of low-frequency radio emission inverse Comp-ton scattering on ultra relativistic electrons accelerated in the gap. The influence of the pulsar magnetic field on Compton scattering is taken into account. The relation of radio and gamma radiation spectra has been found in the framework of the model.
[ { "version": "v1", "created": "Sat, 29 Dec 2007 11:46:42 GMT" } ]
2009-06-23T00:00:00
[ [ "Kontorovich", "V. M.", "" ], [ "Flanchik", "A. B.", "" ] ]
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801.0058
Olli Punkkinen
Olli Punkkinen, Ali Naji, Rudolf Podgornik, Ilpo Vattulainen, and Per-Lyngs Hansen
Ionic Cloud Distribution close to a Charged Surface in the Presence of Salt
6 pages, 2 figures
Europhys. Lett. 82, 48001 (2008)
10.1209/0295-5075/82/48001
null
physics.bio-ph cond-mat.soft
null
Despite its importance, the understanding of ionic cloud distribution close to a charged macroion under physiological salt conditions has remained very limited especially for strongly coupled systems with, for instance, multivalent counterions. Here we present a formalism that predicts both counterion and coion distributions in the vicinity of a charged macroion for an arbitrary amount of added salt and in both limits of mean field and strong coupling. The distribution functions are calculated explicitly for ions next to an infinite planar charged wall. We present a schematic phase diagram identifying different physical regimes in terms of electrostatic coupling parameter and bulk salt concentration.
[ { "version": "v1", "created": "Sat, 29 Dec 2007 11:49:47 GMT" } ]
2009-05-24T00:00:00
[ [ "Punkkinen", "Olli", "" ], [ "Naji", "Ali", "" ], [ "Podgornik", "Rudolf", "" ], [ "Vattulainen", "Ilpo", "" ], [ "Hansen", "Per-Lyngs", "" ] ]
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801.0059
Ron Peled
Ron Peled, Ariel Yadin and Amir Yehudayoff
The Maximal Probability that k-wise Independent Bits are All 1
30 pages, 4 figures. This version adds an appendix with short proofs of some of the cited results
Random Struct. Alg., 38, 502-525, 2011
null
null
math.PR math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A k-wise independent distribution on n bits is a joint distribution of the bits such that each k of them are independent. In this paper we consider k-wise independent distributions with identical marginals, each bit has probability p to be 1. We address the following question: how high can the probability that all the bits are 1 be, for such a distribution? For a wide range of the parameters n,k and p we find an explicit lower bound for this probability which matches an upper bound given by Benjamini et al., up to multiplicative factors of lower order. The question we investigate can be seen as a relaxation of a major open problem in error-correcting codes theory, namely, how large can a linear error correcting code with given parameters be? The question is a type of discrete moment problem, and our approach is based on showing that bounds obtained from the theory of the classical moment problem provide good approximations for it. The main tool we use is a bound controlling the change in the expectation of a polynomial after small perturbation of its zeros.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 02:52:17 GMT" }, { "version": "v2", "created": "Thu, 3 Jan 2008 00:56:55 GMT" }, { "version": "v3", "created": "Sun, 31 Jul 2011 14:58:06 GMT" } ]
2011-08-02T00:00:00
[ [ "Peled", "Ron", "" ], [ "Yadin", "Ariel", "" ], [ "Yehudayoff", "Amir", "" ] ]
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801.006
Dibyendu Roy
N. Kumar
Deflection of Ultra Slow Light by Earth Gravity on Laboratory Length Scale
8 pages
EPL, 82 (2008) 60002
10.1209/0295-5075/82/60002
null
physics.optics
null
The high speed of light in vacuo together with the weakness of Earth gravity rules out any experimental detection of gravitational deflection of light on the laboratory length scale. Recent advances in coherent optics that produce ultra slow light in highly dispersive media with the group velocities down to ~102 ms-1, or even less, however, open up this possibility. In this work, we present a theoretical study for a possible laboratory observation of the deflection of such an ultra slow light in the highly dispersive medium under Earth gravity. Our general relativistic calculation is based on the Gordon optical metric modified so as to include dispersion. The calculated linear vertical deflection turns out to be ~0.1 mm for a horizontal traversal of 0.1 m, and a group speed vg ~ 102 ms-1. Experimental realizability and some conceptual points involved will be briefly discussed.
[ { "version": "v1", "created": "Sat, 29 Dec 2007 12:36:16 GMT" } ]
2009-11-13T00:00:00
[ [ "Kumar", "N.", "" ] ]
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801.0061
Danilo Silva
Danilo Silva, Frank R. Kschischang
Security for Wiretap Networks via Rank-Metric Codes
5 pages, to be published at the 2008 IEEE International Symposium on Information Theory
null
10.1109/ISIT.2008.4594971
null
cs.IT cs.CR math.IT
null
The problem of securing a network coding communication system against a wiretapper adversary is considered. The network implements linear network coding to deliver $n$ packets from source to each receiver, and the wiretapper can eavesdrop on $\mu$ arbitrarily chosen links. A coding scheme is proposed that can achieve the maximum possible rate of $k=n-\mu$ packets that are information-theoretically secure from the adversary. A distinctive feature of our scheme is that it is universal: it can be applied on top of any communication network without requiring knowledge of or any modifications on the underlying network code. In fact, even a randomized network code can be used. Our approach is based on Rouayheb-Soljanin's formulation of a wiretap network as a generalization of the Ozarow-Wyner wiretap channel of type II. Essentially, the linear MDS code in Ozarow-Wyner's coset coding scheme is replaced by a maximum-rank-distance code over an extension of the field in which linear network coding operations are performed.
[ { "version": "v1", "created": "Sat, 29 Dec 2007 12:50:14 GMT" }, { "version": "v2", "created": "Fri, 2 May 2008 02:45:13 GMT" } ]
2016-11-17T00:00:00
[ [ "Silva", "Danilo", "" ], [ "Kschischang", "Frank R.", "" ] ]
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801.0062
Alexandre Barabanov
A.F. Barabanov, A.M. Belemuk, L.A. Maksimov
On the Kinetic Equation and Electrical Resistivity in Systems with Strong Spin- Hole Interaction
6 pages, 3 figures
JETP Lett. 86, 321- 327 (2007)
null
null
cond-mat.str-el cond-mat.supr-con
null
The problem of constructing the kinetic equation with the description of motion of a hole in systems with strong spin- hole interaction (such as high- temperature superconductors) in terms of the spin polaron has been considered in the framework of the regular antiferromagnetic $s-d$ model. It has been shown by the example of the electrical resistivity that kinetics is determined by the properties of the bands of the spin polaron (rather than "bar hole") and their quasiparticle residues $Z_{k}$. The cases of low and optimal doping of the $CuO_{2}$ plane have been considered. It has been shown that the rearrangement of the spectrum of the lower polaron band, as well as the strong doping dependence of the quasiparticle residues $Z_{k}$ is decisive in the unified consideration of these cases.
[ { "version": "v1", "created": "Sat, 29 Dec 2007 13:06:13 GMT" } ]
2008-01-03T00:00:00
[ [ "Barabanov", "A. F.", "" ], [ "Belemuk", "A. M.", "" ], [ "Maksimov", "L. A.", "" ] ]
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801.0063
Hvedri Inassaridze
Jiri Rosicky and Walter Tholen
Factorization, Fibration and Torsion
To be published in "Journal of homotopy and Related Structures"
null
null
null
math.AT
null
A simple definition of torsion theory is presented, as a factorization system with both classes satisfying the 3--for--2 property. Comparisons with the traditional notion are given, as well as connections with the notions of fibration and of weak factorization system, as used in abstract homotopy theory.
[ { "version": "v1", "created": "Sat, 29 Dec 2007 13:13:49 GMT" } ]
2008-01-03T00:00:00
[ [ "Rosicky", "Jiri", "" ], [ "Tholen", "Walter", "" ] ]
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801.0064
Alessandro Marconi
Giovanna De Francesco (1), Alessandro Capetti (1), Alessandro Marconi (2) ((1)INAF - Osservatorio Astronomico di Torino, Italy, (2) Dipartimento di Astronomia e Scienza dello Spazio, Universit\`a di Firenze, Italy)
Measuring supermassive black holes with gas kinematics - II. The LINERs IC 989, NGC 5077, and NGC 6500
Accepted for publication in A&A
null
10.1051/0004-6361:20078570
null
astro-ph
null
We present results from a kinematical study of the gas in the nucleus of a sample of three LINER galaxies, obtained from archival HST/STIS long-slit spectra. We found that, while for the elliptical galaxy NGC 5077, the observed velocity curves are consistent with gas in regular rotation around the galaxy's center, this is not the case for the two remaining objects. By modeling the surface brightness distribution and rotation curve from the emission lines in NGC 5077, we found that the observed kinematics of the circumnuclear gas can be accurately reproduced by adding to the stellar mass component a black hole mass of M_bh = 6.8 (-2.8,+4.3) 10**8 M_sun (uncertainties at a 1 sigma level); the radius of its sphere of influence (R_sph ~ 0".34) is well-resolved at the HST resolution. The BH mass estimate in NGC 5077 is in fairly good agreement with both the M_bh-M_bul (with an upward scatter of ~ 0.4 dex) and M_bh-sigma correlations (with an upward scatter of 0.5 dex in the Tremaine et al. form and essentially no scatter using the Ferrarese et al. form) and provides further support for the presence of a connection between the ``residuals'' from the M_bh-sigma correlation and the bulge effective radius. This indicates the presence of a black hole's ``fundamental plane'' in the sense that a combination of at least sigma and R_e drives the correlations between M_bh and host bulge properties.
[ { "version": "v1", "created": "Sat, 29 Dec 2007 14:02:26 GMT" } ]
2009-11-13T00:00:00
[ [ "De Francesco", "Giovanna", "" ], [ "Capetti", "Alessandro", "" ], [ "Marconi", "Alessandro", "" ] ]
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801.0065
Miguel Pi\~nar
Lidia Fernandez, Teresa E. Perez, Miguel A. Pinar, Yuan Xu
Krall--type Orthogonal Polynomials in several variables
10 pages
null
null
null
math.CA
null
For a bilinear form obtained by adding a Dirac mass to a positive definite moment functional in several variables, explicit formulas of orthogonal polynomials are derived from the orthogonal polynomials associated with the moment functional. Explicit formula for the reproducing kernel is also derived and used to establish certain inequalities for classical orthogonal polynomials.
[ { "version": "v1", "created": "Sat, 29 Dec 2007 13:59:26 GMT" } ]
2008-01-03T00:00:00
[ [ "Fernandez", "Lidia", "" ], [ "Perez", "Teresa E.", "" ], [ "Pinar", "Miguel A.", "" ], [ "Xu", "Yuan", "" ] ]
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801.0066
Alexander Orlov Yur'evich
J.W. van de Leur and A. Yu. Orlov
Random turn walk on a half line with creation of particles at the origin
23 pages, 2 figures, has been reported on the workshop "Random and integrable models in mathematics and physics" in Brussel, September 11-15, 2007
null
null
null
cond-mat.dis-nn cond-mat.other math-ph math.MP math.PR nlin.SI
null
We consider a version of random motion of hard core particles on the semi-lattice $ 1, 2, 3,...$, where in each time instant one of three possible events occurs, viz., (a) a randomly chosen particle hops to a free neighboring site, (b) a particle is created at the origin (namely, at site 1) provided that site 1 is free and (c) a particle is eliminated at the origin (provided that the site 1 is occupied). Relations to the BKP equation are explained. Namely, the tau functions of two different BKP hierarchies provide generating functions respectively (I) for transition weights between different particle configurations and (II) for an important object: a normalization function which plays the role of the statistical sum for our non-equilibrium system. As an example we study a model where the hopping rate depends on two parameters ($r$ and $\beta$). For time $\time\to\infty$ we obtain the asymptotic configuration of particles obtained from the initial empty state (the state without particles) and find an analog of the first order transition at $\beta=1$.
[ { "version": "v1", "created": "Sat, 29 Dec 2007 14:19:17 GMT" } ]
2008-01-03T00:00:00
[ [ "van de Leur", "J. W.", "" ], [ "Orlov", "A. Yu.", "" ] ]
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801.0067
Marcelo Botta Cantcheff
Marcelo Botta Cantcheff
Einstein-Cartan formulation of Chern-Simons Lorentz-violating Gravity
Final version
Phys.Rev.D78:025002,2008
10.1103/PhysRevD.78.025002
null
hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider a modification of the standard Einstein theory in four dimensions, alternative to R. Jackiw and S.-Y. Pi, Phys. Rev. D 68, 104012 (2003), since it is based on the first-order (Einstein-Cartan) approach to General Relativity, whose gauge structure is manifest. This is done by introducing an additional topological term in the action which becomes a Lorentz-violating term by virtue of the dependence of the coupling on the space-time point. We obtain a condition on the solutions of the Einstein equations, such that they persist in the deformed theory, and show that the solutions remarkably correspond to the classical solutions of a collection of independent 2+1-d (topological) Chern-Simons gravities. Finally, we study the relation with the standard second-order approach and argue that they both coincide to leading order in the modulus of the Lorentz-violating vector field.
[ { "version": "v1", "created": "Sat, 29 Dec 2007 14:27:57 GMT" }, { "version": "v2", "created": "Thu, 17 Apr 2008 13:01:59 GMT" }, { "version": "v3", "created": "Thu, 1 May 2008 14:43:24 GMT" }, { "version": "v4", "created": "Fri, 18 Jul 2008 16:25:29 GMT" } ]
2008-11-26T00:00:00
[ [ "Cantcheff", "Marcelo Botta", "" ] ]
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801.0068
Jean-Philippe Uzan
Jean-Philippe Uzan, Chris Clarkson, and George F.R. Ellis
Time drift of cosmological redshifts as a test of the Copernican principle
4 pages. Version matching the published text in PRL
Phys.Rev.Lett.100:191303,2008
10.1103/PhysRevLett.100.191303
null
astro-ph gr-qc
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present the time drift of the cosmological redshift in a general spherically symmetric spacetime. We demonstrate that its observation would allow us to test the Copernican principle and so determine if our universe is radially inhomogeneous, an important issue in our understanding of dark energy. In particular, when combined with distance data, this extra observable allows one to fully reconstruct the geometry of a spacetime describing a spherically symmetric under-dense region around us, purely from background observations.
[ { "version": "v1", "created": "Sat, 29 Dec 2007 14:36:16 GMT" }, { "version": "v2", "created": "Wed, 23 Jul 2008 16:20:50 GMT" } ]
2009-06-23T00:00:00
[ [ "Uzan", "Jean-Philippe", "" ], [ "Clarkson", "Chris", "" ], [ "Ellis", "George F. R.", "" ] ]
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801.0069
N\'eji Bettaibi
N\'eji Bettaibi and Rym H. bettaieb
$q$-Analogue of the Dunkl transform on the real line
20 pages. to appear in Tamsui Oxford Journal Sciences
null
null
null
math.QA
null
In this paper, we consider a $q$-analogue of the Dunkl operator on $\mathbb{R}$, we define and study its associated Fourier transform which is a $q$-analogue of the Dunkl transform. In addition to several properties, we establish an inversion formula and prove a Plancherel theorem for this $q$-Dunkl transform. Next, we study the $q$-Dunkl intertwining operator and its dual via the $q$-analogues of the Riemann-Liouville and Weyl transforms. Using this dual intertwining operator, we provide a relation between the $q$-Dunkl transform and the $q^2$-analogue Fourier transform introduced and studied by R. Rubin.
[ { "version": "v1", "created": "Sat, 29 Dec 2007 14:40:08 GMT" } ]
2008-01-03T00:00:00
[ [ "Bettaibi", "Néji", "" ], [ "bettaieb", "Rym H.", "" ] ]
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801.007
Gavin Salam
Gavin P. Salam
Recent progress in defining and understanding jets
7 pages, 4 figures. Presented at the 37th International Symposium on Multiparticle Dynamics, Berkeley, USA, August 2007
Acta Phys.Polon.Supp.1:455-461,2008
null
null
hep-ph
null
This talk reviews some key developments that have taken place in hadron-collider jet finding over the past couple of years, including: technical advances such as the complete formulation of an infrared safe seedless cone algorithm and fast computational approaches to sequential recombination jet finders like the kt algorithm, together with universal methods for subtracting pileup; progress in understanding the sensitivity of jet algorithms to the underlying event and hadronisation; and work that exploits our knowledge of QCD divergences to better define and predict heavy-flavour jet cross sections.
[ { "version": "v1", "created": "Wed, 2 Jan 2008 14:32:55 GMT" } ]
2009-01-16T00:00:00
[ [ "Salam", "Gavin P.", "" ] ]
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801.0071
Richard Shurtleff
Richard Shurtleff
Dual Phase Cosmic Rays
19 pages, 2 figures, 11 problems, LaTeX
null
null
null
astro-ph hep-th
null
A calculation based on flat spacetime symmetries shows how there can be two quantum phases. For one, extreme phase change determines a conventional classical trajectory and four-momentum, i.e. mass times four-velocity. The other phase occurs in an effective particle state, with the effective energy and momentum being the rate of change of the phase with respect to time and distance. A cosmic ray proton moves along a classical trajectory, but exists in an effective particle state with an effective energy that depends on the local gravitational potential. Assumptions are made so that a cosmic ray proton in an ultra-high energy state detected near the Earth was in a much less energetic state in interstellar space. A 300 EeV proton incident on the Earth was a 2 PeV proton in interstellar space. The model predicts such protons are in states with even more energy near the Sun than when near the Earth.
[ { "version": "v1", "created": "Sun, 30 Dec 2007 15:22:40 GMT" } ]
2008-01-05T00:00:00
[ [ "Shurtleff", "Richard", "" ] ]
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801.0072
Vladimir Shevelev
Vladimir Shevelev
On the Basis Polynomials in the Theory of Permutations with Prescribed Up-Down Structure
Revised argument in Section 13; results unchanged
null
null
null
math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Let $\pi=(\pi_1,\pi_2,\hdots,\pi_n)$ be permutation of the elements $1,2,\hdots,n. $ Positive integer $k\leq2^{n-1}$ we call index of $\pi,$ if in its binary notation as $n$-digital binary number, the 1's correspond to the ascent points. We study behavior and properties of numbers of permutations of $n$ elements having index $k.$
[ { "version": "v1", "created": "Sun, 30 Dec 2007 09:06:13 GMT" }, { "version": "v2", "created": "Wed, 22 Sep 2010 15:20:48 GMT" } ]
2010-09-23T00:00:00
[ [ "Shevelev", "Vladimir", "" ] ]
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