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801.1973
Michael Ivanov A
Michael A. Ivanov
A non-universal transition to asymptotic freedom in low-energy quantum gravity
8 pages, 6 figures, Latex
Journal of Gravitational Physics, 2008, vol.2, No.2, pp. 26-31
null
null
hep-th gr-qc quant-ph
null
The model of low-energy quantum gravity by the author has the property of asymptotic freedom at very short distances. The character of transition to asymptotic freedom is studied here. It is shown that this transition is not universal, but the one obeys the scaling rule: the range of this transition in units of $r/E^{1/2}$, where $r$ is a distance between particles and $E$ is an energy of the screening particle, is the same for any micro-particle. This range for a proton is between $10^{-11} - 10^{-13}$ meter, while for an electron it is approximately between $10^{-13} - 10^{-15}$ meter.
[ { "version": "v1", "created": "Sun, 13 Jan 2008 17:35:42 GMT" } ]
2008-03-14T00:00:00
[ [ "Ivanov", "Michael A.", "" ] ]
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801.1974
Georg Weiglein
S. Heinemeyer, V.A. Khoze, M. Ryskin, W. Stirling, M. Tasevsky and G. Weiglein
Central Exclusive Diffractive MSSM Higgs-Boson Production at the LHC
5 pages, to appear in the proceedings of EPS07
J.Phys.Conf.Ser.110:072016,2008
10.1088/1742-6596/110/7/072016
IPPP/07/86, DCPT/07/172
hep-ph
null
The prospects for central exclusive diffractive (CED) production of MSSM Higgs bosons at the LHC are reviewed. It is shown that the CED channels, making use of forward proton detectors at the LHC installed at 220 m and 420 m distance around ATLAS and / or CMS, can provide important information on the Higgs sector of the MSSM. In particular, CED production of the neutral CP-even Higgs bosons h and H and their decays into bottom quarks has the potential to probe interesting regions of the M_A--tan_beta parameter plane of the MSSM and may give access to the bottom Yukawa couplings of the Higgs bosons up to masses of M_H \approx 250 GeV.
[ { "version": "v1", "created": "Sun, 13 Jan 2008 18:05:26 GMT" } ]
2008-11-26T00:00:00
[ [ "Heinemeyer", "S.", "" ], [ "Khoze", "V. A.", "" ], [ "Ryskin", "M.", "" ], [ "Stirling", "W.", "" ], [ "Tasevsky", "M.", "" ], [ "Weiglein", "G.", "" ] ]
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801.1975
Alexander Moskvin
A.S. Moskvin, Yu.D. Panov, and S.-L. Drechsler
Nonrelativistic Multiferroicity in the Nonstoichiometric Spin s=1/2 Spiral Chain Cuprate LiCu2O2
4 pages, 4 figures
null
10.1103/PhysRevB.79.104112
null
cond-mat.str-el cond-mat.mtrl-sci
null
We argue for a recently observed puzzling multiferroic behavior in s=1/2 1D chain cuprate LiCu2O2 with edge-shared arrangement of CuO4 plaquettes and incommensurate spiral spin ordering can be consistently explained if one takes into account the nonrelativistic exchange-induced electric polarization on the Cu2+ centers substituting for the positions native for the Cu1+ ions. These substituent centers are proved to be an effective probe of the spin incommensurability and magnetic field effects.
[ { "version": "v1", "created": "Sun, 13 Jan 2008 18:17:37 GMT" } ]
2009-11-13T00:00:00
[ [ "Moskvin", "A. S.", "" ], [ "Panov", "Yu. D.", "" ], [ "Drechsler", "S. -L.", "" ] ]
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801.1976
Milan Janjic
Milan Janjic
An Enumerative Function
null
null
null
null
math.CO
null
We define an enumerative function F(n,k,P,m) which is a generalization of binomial coefficients. Special cases of this function are also power function, factorials, rising factorials and falling factorials. The first section of the paper is an introduction. In the second section we derive an explicit formula for F. From the expression for the power function we obtain a number theory result. Then we derive a formula which shows that the case of arbitrary m may be reduced to the case m=0. This formula extends Vandermonde convolution. In the second section we describe F by the series of recurrence relations with respect to each of arguments k, n, and P. As a special case of the first recurrence relation we state a binomial identity. As a consequence of the second recurrence relation we obtain relation for coefficients of Chebyshev polynomial of both kind. This means that these polynomials might be defined in pure combinatorial way.
[ { "version": "v1", "created": "Sun, 13 Jan 2008 18:43:46 GMT" }, { "version": "v2", "created": "Sat, 19 Jan 2008 16:52:46 GMT" } ]
2008-01-19T00:00:00
[ [ "Janjic", "Milan", "" ] ]
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801.1977
Grzegorz Michalek
G. Michalek, N. Gopalswamy, S. Yashiro
Space Weather Application Using Projected Velocity Asymmetry of Halo CMEs
accepted for [publication in Solar Physics
null
10.1007/s11207-008-9126-7
null
astro-ph
null
Halo coronal mass ejections (HCMEs) originating from regions close to the center of the Sun are likely to be responsible for severe geomagnetic storms. It is important to predict geo-effectiveness of HCMEs using observations when they are still near the Sun. Unfortunately, coronagraphic observations do not provide true speeds of CMEs due to the projection effects. In the present paper, we present a new technique allowing estimate the space speed and approximate source location using projected speeds measured at different position angles for a given HCME (velocity asymmetry). We apply this technique to HCMEs observed during 2001-2002 and find that the improved speeds are better correlated with the travel times of HCMEs to Earth and with the magnitudes ensuing geomagnetic storms.
[ { "version": "v1", "created": "Sun, 13 Jan 2008 18:45:52 GMT" } ]
2009-11-13T00:00:00
[ [ "Michalek", "G.", "" ], [ "Gopalswamy", "N.", "" ], [ "Yashiro", "S.", "" ] ]
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801.1978
Galina L. Klimchitskaya
G. L. Klimchitskaya, V. M. Mostepanenko
Conductivity of dielectric and thermal atom-wall interaction
4 pages, 2 figures; page size is corrected
J. Phys. A: Math. Theor. v.41, 312002(F), 2008.
10.1088/1751-8113/41/31/312002
null
quant-ph cond-mat.stat-mech physics.optics
null
We compare the experimental data of the first measurement of a temperature dependence of the Casimir-Polder force by Obrecht et al. [Phys. Rev. Lett. {\bf 98}, 063201 (2007)] with the theory taking into account small, but physically real, static conductivity of the dielectric substrate. The theory is found to be inconsistent with the data. The conclusion is drawn that the conductivity of dielectric materials should not be included in the model of the dielectric response in the Lifshitz theory. This conclusion obtained from the long separation measurement is consistent with related but different results obtained for semiconductors and metals at short separations.
[ { "version": "v1", "created": "Sun, 13 Jan 2008 18:48:14 GMT" }, { "version": "v2", "created": "Tue, 15 Jan 2008 21:57:16 GMT" } ]
2009-11-13T00:00:00
[ [ "Klimchitskaya", "G. L.", "" ], [ "Mostepanenko", "V. M.", "" ] ]
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801.1979
Gregory Gutin
G. Gutin, I. Razgon, E.J. Kim
Minimum Leaf Out-branching and Related Problems
The main change is a quadratic kernel derivation
null
null
null
cs.DS cs.DM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Given a digraph $D$, the Minimum Leaf Out-Branching problem (MinLOB) is the problem of finding in $D$ an out-branching with the minimum possible number of leaves, i.e., vertices of out-degree 0. We prove that MinLOB is polynomial-time solvable for acyclic digraphs. In general, MinLOB is NP-hard and we consider three parameterizations of MinLOB. We prove that two of them are NP-complete for every value of the parameter, but the third one is fixed-parameter tractable (FPT). The FPT parametrization is as follows: given a digraph $D$ of order $n$ and a positive integral parameter $k$, check whether $D$ contains an out-branching with at most $n-k$ leaves (and find such an out-branching if it exists). We find a problem kernel of order $O(k^2)$ and construct an algorithm of running time $O(2^{O(k\log k)}+n^6),$ which is an `additive' FPT algorithm. We also consider transformations from two related problems, the minimum path covering and the maximum internal out-tree problems into MinLOB, which imply that some parameterizations of the two problems are FPT as well.
[ { "version": "v1", "created": "Sun, 13 Jan 2008 19:33:29 GMT" }, { "version": "v2", "created": "Mon, 28 Jan 2008 17:41:09 GMT" }, { "version": "v3", "created": "Tue, 14 Oct 2008 20:51:12 GMT" } ]
2008-10-14T00:00:00
[ [ "Gutin", "G.", "" ], [ "Razgon", "I.", "" ], [ "Kim", "E. J.", "" ] ]
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801.198
Michael Trusov
I.M.Narodetskii, M.A.Trusov, A.I.Veselov
Charm and bottom baryons in nonperturbative quark dynamics
Contributed talk at the session of Russian Academy of Sciences "Physics of Fundamental Interactions", ITEP, Moscow, November 26-30, 2007
Phys.Atom.Nucl.72:536-540,2009
10.1134/S1063778809030193
null
hep-ph
null
We use the Field Correlator Method in QCD to calculate the masses of $\Sigma_c$, $\Xi_c$ and recently observed $\Sigma_b$, $\Xi_b$ baryons and their orbital excitations.
[ { "version": "v1", "created": "Sun, 13 Jan 2008 19:47:02 GMT" } ]
2009-04-17T00:00:00
[ [ "Narodetskii", "I. M.", "" ], [ "Trusov", "M. A.", "" ], [ "Veselov", "A. I.", "" ] ]
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801.1981
Andrey O. Matveev
Andrey O. Matveev
Neighboring Fractions in Farey Subsequences
14 pages; v.2,3 - misprints in Corollary 2.3(ii) and Remark 4.1(iii) corrected; v.4 - minor improvements; v.5 - new Section 2 and references added.
null
null
null
math.NT math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present explicit formulas for the computation of the neighbors of several elements of Farey subsequences.
[ { "version": "v1", "created": "Sun, 13 Jan 2008 20:02:36 GMT" }, { "version": "v2", "created": "Sat, 19 Jan 2008 22:23:09 GMT" }, { "version": "v3", "created": "Sat, 23 Feb 2008 19:07:40 GMT" }, { "version": "v4", "created": "Sun, 30 Nov 2008 12:14:36 GMT" }, { "version": "v5", "created": "Mon, 10 May 2010 16:25:45 GMT" } ]
2010-05-11T00:00:00
[ [ "Matveev", "Andrey O.", "" ] ]
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801.1982
Luciano da Fontoura Costa
Luciano da Fontoura Costa
Inward and Outward Node Accessibility in Complex Networks as Revealed by Non-Linear Dynamics
null
null
null
null
physics.soc-ph cond-mat.dis-nn
null
In this work, the outward and inward accessibilities of individual nodes are defined and their potential for application is illustrated with respect to the investigation of 6 different types of networks. The outward accessibility quantifies the potential of an individual node for accessing other nodes through random walks. The inward accessibility measures the potential of a given node of being accessed by other nodes. Both the inward and outward accessibilities are measured with respect to successive time steps along the walks, providing an interesting means for the characterization of the transient non-linear dynamics of accessibility. Self-avoiding walks are considered here because they are more purposive and necessarily finite (unlike traditional random walks). The results include the identification of the fact that the inward values tend to be much smaller than the outward values, the tendency of the inward accessibility to be highly correlated with the node degree while the outward values are mostly uncorrelated with that measurements, the distinct behavior of the accessibility in geographical networks, the dominance of hubs in scale free networks, as well as the enhanced uniformity of the accessibilities for the path-regular model. Also investigated was the possibility to predict the accessibility of a given node in terms of its respective degree. The concepts of inward and outward accessibility, as well as the several obtained results, have several implications and potential for applications to several real-time problems including disease spreading, WWW surfing, protein interaction, cortical networks and network attacks, among others.
[ { "version": "v1", "created": "Sun, 13 Jan 2008 20:46:44 GMT" } ]
2008-01-15T00:00:00
[ [ "Costa", "Luciano da Fontoura", "" ] ]
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801.1983
Tien-Cuong Dinh
Tien-Cuong Dinh, Viet-Anh Nguyen and Nessim Sibony
Exponential estimates for plurisubharmonic functions and stochastic dynamics
24 pages, theorem and references added
null
null
null
math.CV math.DS
null
We prove exponential estimates for plurisubharmonic functions with respect to Monge-Ampere measures with Holder continuous potential. As an application, we obtain several stochastic properties for the equilibrium measures associated to holomorphic maps on projective spaces. More precisely, we prove the exponential decay of correlations, the central limit theorem for general d.s.h. observables, and the large deviations theorem for bounded d.s.h. observables and Holder continuous observables.
[ { "version": "v1", "created": "Sun, 13 Jan 2008 20:55:50 GMT" }, { "version": "v2", "created": "Tue, 4 Mar 2008 20:51:46 GMT" } ]
2008-03-04T00:00:00
[ [ "Dinh", "Tien-Cuong", "" ], [ "Nguyen", "Viet-Anh", "" ], [ "Sibony", "Nessim", "" ] ]
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801.1984
Emre Kahya Mr.
E. O. Kahya
A Decisive test to confirm or rule out the existence of dark matter emulators using gravitational wave observations
4 Pages, no figures, Contributed to 12th Annual Gravitational Wave Data Analysis Workshop (GWDAW-12 2007): Connecting Gravitational Waves with Observational Astrophysics, Cambridge, Massachusetts, 13-16 Dec 2007
Class.Quant.Grav.25:184008,2008
10.1088/0264-9381/25/18/184008
UFIFT-QG-08-01
gr-qc astro-ph hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider stable modified theories of gravity that reproduce galactic rotation curves and the observed amount of weak lensing without dark matter. In any such model gravity waves follow a different geodesic from that of other massless particles. For a specific class of models which we call "dark matter emulators," over cosmological distances this results in an easily detectable and difference between the arrival times of the pulse of gravity waves from some cosmic event and those of photons or neutrinos. For a repeat of SN 1987a (which took place in the Large Magellanic Cloud) the time lag is in the range of days. For the recent gamma ray burst, GRB 070201 (which seems to have taken place on the edge of the Andromeda galaxy) the time lag would be in the range of about two years.
[ { "version": "v1", "created": "Sun, 13 Jan 2008 21:00:08 GMT" }, { "version": "v2", "created": "Sun, 19 Oct 2008 15:04:33 GMT" } ]
2008-11-07T00:00:00
[ [ "Kahya", "E. O.", "" ] ]
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801.1985
Constantinos Skordis
Constantinos Skordis
Generalizing TeVeS Cosmology
12 pages
Phys.Rev.D77:123502,2008
10.1103/PhysRevD.77.123502
pi-cosmo-70
astro-ph
null
I consider an extented version of Bekenstein's Tensor-Vector-Scalar theory where the action of the vector field is of a general Einstein-Ether form. This work presents the cosmological equations of this theory, both at the background and perturbed level, for scalar, vector and tensor perturbation modes. By solving the background equations in the radiation era analytically, to an excellent approximation, I construct the primordial adiabatic perturbation for a general family of scalar field kinetic functions.
[ { "version": "v1", "created": "Sun, 13 Jan 2008 21:11:33 GMT" } ]
2008-11-26T00:00:00
[ [ "Skordis", "Constantinos", "" ] ]
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801.1986
Karl-Heinz Kampert
Karl-Heinz Kampert
Ultra High-Energy Cosmic Ray Observations
9 pages, 8 figures, Invited paper presented at TAUP 2007 (Sendai, Japan), to appear in Journal of Physics
J.Phys.Conf.Ser.120:062002,2008
10.1088/1742-6596/120/6/062002
null
astro-ph
null
The year 2007 has furnished us with outstanding results about the origin of the most energetic cosmic rays: a flux suppression as expected from the GZK-effect has been observed in the data of the HiRes and Auger experiments and correlations between the positions of nearby AGN and the arrival directions of trans-GZK events have been observed by the Pierre Auger Observatory. The latter finding marks the beginning of ultra high-energy cosmic ray astronomy and is considered a major breakthrough starting to shed first light onto the sources of the most extreme particles in nature. This report summarizes those observations and includes other major advances of the field, mostly presented at the 30th International Cosmic Ray Conference held in Merida, Mexico, in July 2007. With increasing statistics becoming available from current and even terminated experiments, systematic differences amongst different experiments and techniques can be studied in detail which is hoped to improve our understanding of experimental techniques and their limitations.
[ { "version": "v1", "created": "Sun, 13 Jan 2008 21:46:40 GMT" } ]
2009-06-23T00:00:00
[ [ "Kampert", "Karl-Heinz", "" ] ]
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801.1987
Neal E. Young
Christos Koufogiannakis and Neal E. Young
A Nearly Linear-Time PTAS for Explicit Fractional Packing and Covering Linear Programs
corrected version of FOCS 2007 paper: 10.1109/FOCS.2007.62. Accepted to Algorithmica, 2013
Algorithmica 70(4):648-674(2014)
10.1007/s00453-013-9771-6
null
cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We give an approximation algorithm for packing and covering linear programs (linear programs with non-negative coefficients). Given a constraint matrix with n non-zeros, r rows, and c columns, the algorithm computes feasible primal and dual solutions whose costs are within a factor of 1+eps of the optimal cost in time O((r+c)log(n)/eps^2 + n).
[ { "version": "v1", "created": "Sun, 13 Jan 2008 22:04:49 GMT" }, { "version": "v2", "created": "Wed, 13 Mar 2013 16:03:10 GMT" } ]
2015-06-02T00:00:00
[ [ "Koufogiannakis", "Christos", "" ], [ "Young", "Neal E.", "" ] ]
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801.1988
Andras Lorincz
Istvan Szita and Andras Lorincz
Online variants of the cross-entropy method
8 pages
null
null
null
cs.LG
null
The cross-entropy method is a simple but efficient method for global optimization. In this paper we provide two online variants of the basic CEM, together with a proof of convergence.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 06:56:42 GMT" } ]
2008-01-15T00:00:00
[ [ "Szita", "Istvan", "" ], [ "Lorincz", "Andras", "" ] ]
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801.1989
Chiu Fan Lee
Chiu Fan Lee
Density functional methods for polymers: a coil-globule transition case study
null
null
null
null
cond-mat.soft cond-mat.stat-mech
null
We consider a free energy functional on the monomer density function that is suitable for the study of coil-globule transition. We demonstrate, with explicitly stated assumptions, why the entropic contribution is in the form of the Kullback-Leibler distance, and that the energy contribution is given by two-body and three-body terms. We then solve for the free energy analytically on a set of trial density functions, and reproduce de Gennes' classical theory on polymer coil-globule transition. We then discuss how our formalism can be applied to study polymer dynamics from the perspective of dynamical density function theory.
[ { "version": "v1", "created": "Sun, 13 Jan 2008 23:42:44 GMT" }, { "version": "v2", "created": "Mon, 14 Jan 2008 22:23:35 GMT" }, { "version": "v3", "created": "Fri, 18 Jan 2008 17:46:51 GMT" } ]
2011-11-10T00:00:00
[ [ "Lee", "Chiu Fan", "" ] ]
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801.199
Daniel Valdez-Balderas
Daniel Valdez-Balderas and David Stroud
Effects of inhomogeneities and thermal fluctuations on the spectral function of a model d-wave superconductor
Accepted for publication in Phys. Rev. B. Scheduled Issue: 01 Jan 2008. 26 Pages and 10 figures
null
10.1103/PhysRevB.77.014515
null
cond-mat.supr-con cond-mat.mes-hall
null
We compute the spectral function $A({\bf k}, \omega)$ of a model two-dimensional high-temperature superconductor, at both zero and finite temperatures $T$. We assume that an areal fraction $c_{\beta}$ of the superconductor has a large gap $\Delta$ ($\beta$ regions), while the rest has a smaller $\Delta$ ($\alpha$ regions), both of which are randomly distributed in space. We find that $A({\bf k}, \omega)$ is most strongly affected by inhomogeneity near the point $\mathbf k = (\pi, 0)$ (and the symmetry-related points). For $c_\beta\simeq 0.5$, $A({\bf k}, \omega)$ exhibits two double peaks (at positive and negative energy) near this k-point if the difference between $\Delta_\alpha$ and $\Delta_\beta$ is sufficiently large in comparison to the hopping integral. The strength of the inhomogeneity required to produce a split spectral function peak suggests that inhomogeneity is unlikely to be the cause of a second branch in the dispersion relation. Thermal fluctuations also affect $A({\bf k}, \omega)$ most strongly near $\mathbf k = (\pi,0)$. Typically, peaks that are sharp at $T = 0$ become reduced in height, broadened, and shifted toward lower energies with increasing $T$; the spectral weight near $\mathbf k = (\pi, 0)$ becomes substantial at zero energy for $T$ greater than the phase-ordering temperature.
[ { "version": "v1", "created": "Sun, 13 Jan 2008 23:13:29 GMT" } ]
2009-11-13T00:00:00
[ [ "Valdez-Balderas", "Daniel", "" ], [ "Stroud", "David", "" ] ]
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801.1991
Bhagawan Sahu
Bhagawan Sahu, Hongki Min, Allan. H. MacDonald, Sanjay K. Banerjee
Energy gaps, magnetism, and electric field effects in bilayer graphene nanoribbons
8 pages, 8 figures (contents and figures changed)
Phys. Rev. B 78, 045404 (2008)
10.1103/PhysRevB.78.045404
null
cond-mat.mtrl-sci
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Using a first principles density functional electronic structure method, we study the energy gaps and magnetism in bilayer graphene nanoribbons as a function of the ribbon width and the strength of an external electric field between the layers. We assume AB (Bernal) stacking and consider both armchair and zigzag edges and two edge alignments distinguished by a 60$^o$ rotation of one layer with respect to the other. Armchair ribbons exhibit three classes of bilayer gaps which decrease with increasing ribbon width. An external electric field between the layers increases the gap in narrow ribbons and decreases the gap for wide ribbons, a property which can be understood semi-analytically using a $\pi$-band tight-binding model and perturbation theory. The magnetic properties of zigzag edge ribbons are different for the two different edge alignments, and not robust for all exchange-correlation approximations considered. Bilayer ribbon gaps are sensitive to the presence or absence of magnetism.
[ { "version": "v1", "created": "Sun, 13 Jan 2008 23:14:19 GMT" }, { "version": "v2", "created": "Wed, 2 Apr 2008 21:32:30 GMT" }, { "version": "v3", "created": "Wed, 2 Jul 2008 17:20:08 GMT" } ]
2009-11-13T00:00:00
[ [ "Sahu", "Bhagawan", "" ], [ "Min", "Hongki", "" ], [ "MacDonald", "Allan. H.", "" ], [ "Banerjee", "Sanjay K.", "" ] ]
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801.1992
David Pask
T. Bates and D. A. Pask
C*-algebras of labelled graphs II - Simplicity results
18 pages, 4 figures
null
null
null
math.OA math.DS
null
We prove simplicity and pure infiniteness results for a certain class of labelled graph $C^*$-algebras. We show, by example, that this class of unital labelled graph $C^*$-algebras is strictly larger than the class of unital graph $C^*$-algebras.
[ { "version": "v1", "created": "Sun, 13 Jan 2008 23:32:37 GMT" } ]
2008-01-15T00:00:00
[ [ "Bates", "T.", "" ], [ "Pask", "D. A.", "" ] ]
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801.1993
Boris Solomyak
Richard Kenyon, Boris Solomyak
On the characterization of expansion maps for self-affine tilings
Revised version. A typo corrected (after publication!) in the definition of the set $\Omega$ at the bottom of p.13
Discrete Comput. Geom. (2010) 43: 577-593
null
null
math.MG math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider self-affine tilings in $\R^n$ with expansion matrix $\phi$ and address the question which matrices $\phi$ can arise this way. In one dimension, $\lambda$ is an expansion factor of a self-affine tiling if and only if $|\lambda|$ is a Perron number, by a result of Lind. In two dimensions, when $\phi$ is a similarity, we can speak of a complex expansion factor, and there is an analogous necessary condition, due to Thurston: if a complex $\lambda$ is an expansion factor of a self-similar tiling, then it is a complex Perron number. We establish a necessary condition for $\phi$ to be an expansion matrix for any $n$, assuming only that $\phi$ is diagonalizable over the complex numbers. We conjecture that this condition on $\phi$ is also sufficient for the existence of a self-affine tiling.
[ { "version": "v1", "created": "Sun, 13 Jan 2008 23:56:34 GMT" }, { "version": "v2", "created": "Sun, 4 Apr 2010 20:44:35 GMT" } ]
2011-07-20T00:00:00
[ [ "Kenyon", "Richard", "" ], [ "Solomyak", "Boris", "" ] ]
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801.1994
Victor Flambaum
V.V. Flambaum
Variation of fundamental constants in space and time: theory and observations
Proceeding of ACFC, BadHonnef, 2007: to be published in EPJ
Eur.Phys.J.ST 163:159-171,2008
10.1140/epjst/e2008-00817-5
null
nucl-th
null
Review of recent works devoted to the temporal and spatial variation of the fundamental constants and dependence of the fundamental constants on the gravitational potential (violation of local position invariance) is presented. We discuss the variation of the fine structure constant $\alpha=e^2/\hbar c$, strong interaction and fundamental masses (Higgs vacuum), e.g. the electron-to-proton mass ratio $\mu=m_e/M_p$ or $X_e=m_e/\Lambda_{QCD}$ and $X_q=m_q/\Lambda_{QCD}$. We also present new results from Big Bang nucleosynthesis and Oklo natural nuclear reactor data and propose new measurements of enhanced effects in atoms, nuclei and molecules, both in quasar and laboratory spectra.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 00:17:46 GMT" } ]
2009-08-18T00:00:00
[ [ "Flambaum", "V. V.", "" ] ]
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801.1995
Arjen van der Wel
Arjen van der Wel
The Dependence of Galaxy Morphology and Structure on Environment and Stellar Mass
Accepted for publication in ApJ Letters, 5 pages, 5 figures. Minor changes made to match published version
null
10.1086/529432
null
astro-ph
null
From the Sloan Digital Sky Survey (SDSS) Data Release 5 (DR5), we extract a sample of 4594 galaxies at redshifts 0.02<z<0.03, complete down to a stellar mass of M=10^10 Msol. We quantify their structure (Sersic index), morphology (Sersic index + ``Bumpiness''), and local environment. We show that morphology and structure are intrinsically different galaxy properties, and we demonstrate that this is a physically relevant distinction by showing that these properties depend differently on galaxy mass and environment. Structure mainly depends on galaxy mass whereas morphology mainly depends on environment. This is driven by variations in star formation activity, as traced by color, which only weakly affects the structure of a galaxy but strongly affects its morphological appearance. The implication of our results is that the existence of the morphology-density relation is intrinsic and not just due to a combination of more fundamental, underlying relations. Our findings have consequences for high-redshift studies, which often use some measure of structure as a proxy for morphology. A direct comparison with local samples selected through visually classified morphologies may lead to biases in the inferred evolution of the morphological mix of the galaxy population, and misinterpretations in terms of how galaxy evolution depends on mass and environment.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 00:20:42 GMT" }, { "version": "v2", "created": "Thu, 31 Jan 2008 20:45:59 GMT" } ]
2009-11-13T00:00:00
[ [ "van der Wel", "Arjen", "" ] ]
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801.1996
Yue Shen
Yue Shen, B. T. Draine, Eric T. Johnson (Princeton)
Modeling Porous Dust Grains with Ballistic Aggregates I: Geometry and Optical Properties
Updated calculations and references; conclusions unchanged; ApJ in press
Astrophys.J. 689 (2008) 260-275
10.1086/592765
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We investigate the scattering and absorption of light by random ballistic aggregates of spherical monomers. We present a general measure for the porosity of an irregular particle. Three different classes of ballistic aggregates are considered, with different degrees of porosity. Scattering and absorption cross sections are calculated, using the discrete dipole approximation (DDA), for grains of three compositions (50% silicate and 50% graphite; 50% silicate and 50% amorphous carbon; and 100% silicate), for wavelengths from 0.1 micron to 4 micron. For fixed particle mass, increased porosity increases the extinction at short wavelengths, but decreases the extinction at wavelengths long compared to the overall aggregate size. Scattering and absorption cross sections are insensitive to monomer size as long as the constituent monomers are small compared with the incident wavelength. We compare our accurate DDA results with two other approximations: the analytical multi-layer sphere (MLS) model and effective medium theory (EMT). For high porosity and/or absorptive materials, the MLS model does not provide a good approximation for scattering and absorption by ballistic aggregates. The EMT method provides a much better approximation than the MLS model for these aggregates, with a typical difference less than 20% in extinction and scattering cross sections compared with DDA results, for all types, compositions and wavelengths probed in this study.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 01:15:01 GMT" }, { "version": "v2", "created": "Thu, 21 Aug 2008 03:27:21 GMT" } ]
2009-11-13T00:00:00
[ [ "Shen", "Yue", "", "Princeton" ], [ "Draine", "B. T.", "", "Princeton" ], [ "Johnson", "Eric T.", "", "Princeton" ] ]
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801.1997
Galyna Dobrovolska
G. Dobrovolska, P. Etingof
An upper bound for the lower central series quotients of a free associative algebra
7 pages; introduction expanded
null
null
null
math.RA math.RT
null
Feigin and Shoikhet conjectured in math/0610410 that successive quotients $B_m(A_n)$ of the lower central series filtration of a free associative algebra $A_n$ have polynomial growth. In this paper we give a proof of this conjecture, using the structure of $W_n$-representation on $B_m(A_n)$ which was defined in math/0610410 . We also prove that the number of squares in a Young diagram $D$ corresponding to an irreducible $W_n$-module in the Jordan-Holder series of $B_m(A_n)$ is bounded above by the integer $(m-1)^2+2[(n-2)/2](m-1)$. This bound combined with MAGMA computations by Rains in math/0610410 allows us to confirm the $W_n$-module structure of $B_3(A_3)$ conjectured in math/0610410 .
[ { "version": "v1", "created": "Mon, 14 Jan 2008 01:14:02 GMT" }, { "version": "v2", "created": "Thu, 27 Mar 2008 18:17:44 GMT" } ]
2008-03-27T00:00:00
[ [ "Dobrovolska", "G.", "" ], [ "Etingof", "P.", "" ] ]
[ 0.0292409714, -0.0396521538, 0.0262023024, 0.0643102154, 0.0357666388, -0.0116004962, 0.0802507773, -0.0281201508, -0.0815957636, -0.0570373312, 0.0362647809, 0.0026012384, -0.1174620315, 0.0077772518, 0.038257353, 0.0143216001, 0.0625168979, -0.0532514453, 0.048045855, 0.062118385, 0.0796031877, -0.0768135935, 0.043612387, 0.0171983745, 0.0369621813, -0.0363893174, -0.0038979659, -0.0908612162, 0.1477490962, -0.0468254052, 0.0718321651, -0.026077766, 0.0097075542, -0.0478964113, -0.0926545262, 0.0564395599, 0.0196641795, -0.0489674211, -0.032180015, 0.1009735093, -0.0991801918, 0.0176217947, -0.0934515521, -0.0050810548, 0.1535275578, 0.0228024777, 0.0723303109, 0.000818822, -0.0244712569, 0.0553436466, -0.0366383903, 0.1555201262, 0.0374852307, -0.0003829471, -0.0347952619, 0.0256294385, -0.0335249975, 0.0426659137, 0.0351688676, -0.0727786347, 0.1000768542, -0.0405239016, 0.0475975275, -0.0285684783, -0.0901139975, 0.0242470913, -0.0769630373, 0.0333755538, 0.1779365391, 0.0414205603, -0.1594056338, -0.0020174775, 0.1124806032, 0.0655555651, -0.0319558494, 0.0612715408, -0.0033126485, -0.0219805427, -0.0303368848, 0.057684917, 0.0750700906, -0.0074721393, 0.0577845424, 0.0216442961, 0.0914589837, -0.0433633141, 0.0600261837, 0.0944976583, -0.0771622881, -0.0302372575, 0.0148321968, 0.0249195844, 0.0255298093, 0.1248345375, 0.0737251043, -0.0142842392, 0.0787563473, 0.0439112708, 0.0183565561, -0.0140849827, -0.0633637384, -0.01250338, 0.0996783376, -0.1017705351, 0.0949957967, 0.0977355838, 0.0017933134, 0.0202370435, -0.1174620315, -0.0100749349, -0.0140849827, -0.0279956143, -0.0549949445, 0.0092031853, 0.0386060514, -0.0797526315, -0.0966396704, 0.0723303109, 0.0061302674, 0.1079973206, -0.0635131821, -0.0461031012, -0.0368127413, -0.0051339823, 0.1801283658, 0.0110338591, -0.0045393244, -0.0317814983, 0.0718321651, -0.0202619508, 0.0498889834, -0.0184437297, 0.0879221708, 0.0361153409, -0.0608232133, -0.03472054, 0.0508852676, -0.0314577073, 0.1085950881, 0.038257353, 0.0568380728, 0.0355175696, 0.009215638, -0.0140974363, 0.0004039625, 0.0434878506, -0.0206853729, -0.0091035562, 0.050686013, 0.0083065284, -0.091907315, 0.0331264846, 0.0538990311, -0.0287926439, 0.0265759081, -0.0810976177, -0.0442101583, 0.0475477129, 0.0866768137, -0.0407231599, 0.0080636833, 0.054546617, -0.054148104, 0.0138359116, 0.0452811643, 0.1639885455, -0.1349966526, -0.0393034518, -0.0792544931, -0.0771622881, 0.0683451667, 0.0264264662, -0.1196538582, -0.0519562736, 0.022254521, 0.0504120328, -0.1580108404, -0.0986322388, 0.0108408285, -0.0432138704, 0.0798024461, 0.0455551408, 0.0120239174, 0.0033562358, -0.0864277408, 0.0605243295, 0.1431661844, -0.0153303389, -0.0008951, -0.0423421226, -0.043438036, 0.058980085, 0.0119554233, 0.1278233975, 0.0484692752, -0.1280226558, 0.0129392548, 0.0118744746, -0.0145955784, 0.0133377686, -0.0761660039, -0.0514581315, -0.0010375377, 0.0036239875, -0.032902319, -0.0313082635, 0.0329770409, 0.005840722, -0.0162020884, 0.0039633471, -0.0422424935, -0.0634135529, 0.0407231599, 0.024508616, -0.0100873876, 0.0908114016, -0.142369166, -0.0018991687, 0.0003183443, 0.137586996, -0.0470495708, 0.0121920407, -0.0023521672, 0.1319081634, 0.0823927894, 0.0198260769, -0.0124971531, 0.0272484012, 0.0191660374, 0.0193030257, 0.0395276174, -0.0136615615, -0.0353183113, -0.0208472684, -0.0424417518, 0.0029032375, 0.0074596857, -0.0108283749, -0.0022058378, -0.0087174959, 0.0479213186, 0.0580336154, 0.0527533032, 0.1195542291, 0.0048288698, 0.0135992933, -0.0523547903, -0.0213703178, 0.0423172154, 0.0430893376, -0.1192553416, -0.0169119425, 0.0212706905, -0.0412462093, -0.0637124404, 0.0044832835 ]
801.1998
James Atkinson
James Atkinson
Backlund transformations for integrable lattice equations
9 pages
null
10.1088/1751-8113/41/13/135202
null
nlin.SI
null
We give new Backlund transformations (BTs) for some known integrable (in the sense of being multidimensionally consistent) quadrilateral lattice equations. As opposed to the natural auto-BT inherent in every such equation, these BTs are of two other kinds. Specifically, it is found that some equations admit additional auto-BTs (with Backlund parameter), whilst some pairs of apparently distinct equations admit a BT which connects them.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 01:25:32 GMT" } ]
2009-11-13T00:00:00
[ [ "Atkinson", "James", "" ] ]
[ -0.0197114926, -0.0570408739, 0.1012304351, 0.0034564242, -0.0522216335, -0.0845342577, -0.0272563733, -0.0624131449, -0.0992290005, 0.0202776883, 0.0071893623, -0.0077358065, -0.0303375293, 0.0510365739, 0.0532750189, 0.0941200778, 0.1011250988, -0.077107884, 0.0214627478, 0.0663633421, -0.0718409568, -0.0814267695, 0.1306199133, 0.0054084808, -0.0963848606, -0.0390016325, 0.004486768, -0.1260903627, -0.0043781372, -0.0862723514, 0.0924873278, -0.0357624702, -0.1027051732, -0.0530906767, 0.0321282856, 0.1141870916, 0.0435048603, 0.0650992841, 0.0128447311, -0.0570408739, 0.0153004378, -0.040897727, -0.0494038239, 0.006175478, -0.0806367323, -0.0107050398, -0.0358941443, 0.1008617505, -0.0574622303, 0.0036901443, 0.0569882058, 0.0310222302, -0.0250574294, -0.0236616917, -0.0661526695, 0.0153267728, -0.0516159348, 0.0627818331, 0.0015093052, -0.0170911942, -0.0289417915, -0.0664686859, -0.0554081276, 0.0371582061, -0.1527410299, -0.0049245814, -0.144524619, 0.0145762349, 0.0026334662, -0.0112975696, -0.078213945, -0.0152609358, 0.039449323, 0.0835335404, 0.020857051, 0.0756331459, 0.0342350602, 0.1004403979, -0.0016796576, 0.1020731479, 0.0795833468, 0.0460593216, 0.0201196801, -0.0372108743, -0.0223317929, -0.0166303385, -0.0442948975, -0.0000746834, -0.0829015151, -0.0627818331, 0.1254583299, 0.0171965342, -0.0820061341, -0.0382379256, 0.0080584064, -0.0021824851, 0.0593056567, -0.021607589, -0.0507468916, -0.0103429379, -0.0213442426, 0.0122851189, 0.0597796813, -0.135570839, 0.0866937041, -0.0039699501, 0.062571153, -0.0388436243, -0.0447952561, 0.0253076088, -0.0774239004, 0.0094936453, 0.0338927098, -0.077107884, -0.0053393524, -0.0461383238, -0.0997030288, -0.0282570906, -0.0499568507, -0.0079201488, -0.0218972694, -0.1194540188, 0.1097628623, 0.0014566359, 0.0380799212, -0.0114160758, 0.0181709155, -0.1687525064, -0.1139764115, 0.0184210949, 0.0970168933, -0.0075909658, -0.050141193, -0.025426114, -0.1170312315, 0.0000649623, -0.0005974676, 0.068838805, 0.0816374496, -0.0901172087, 0.075685814, 0.0196983255, -0.0181709155, -0.0823748186, -0.0287047792, 0.148106128, 0.0725783259, 0.0641512349, 0.0251232665, 0.0107642924, -0.0439788848, -0.024004044, 0.0806894004, 0.0420827866, -0.0008525847, -0.0451902784, 0.0146025689, 0.078213945, 0.1072347388, -0.0316542611, 0.0795306787, -0.0181182474, 0.0100795915, 0.0113963243, 0.0488771312, -0.0026384038, -0.0711562559, 0.0058561703, -0.1024418324, -0.0626238212, 0.031733267, -0.0053130179, -0.081795454, -0.0699975267, 0.008519263, 0.0177232269, -0.0895905122, -0.0692601576, -0.1412591189, -0.0792146623, 0.0409503989, -0.0115214139, 0.0091644619, -0.0993343368, 0.0437155366, 0.0268876888, -0.1061286852, 0.0206858758, -0.034788087, -0.0474287234, -0.0530906767, 0.1654870063, 0.0431098379, 0.1252476424, 0.0461383238, -0.121876806, 0.0496671684, 0.0591476485, 0.0580942631, 0.0815847814, 0.0278620701, -0.0924873278, 0.0758438259, 0.0054973606, -0.0846396014, 0.0550394394, 0.0199880078, 0.0407133847, -0.0942254141, -0.0854823068, 0.0041279579, -0.0494038239, 0.0335503593, 0.0041444171, -0.0469546989, 0.1268277317, -0.0083151693, -0.0259264726, 0.0489824675, 0.0684174448, -0.0993870124, 0.0499831848, -0.0272827093, -0.0763178468, 0.0174203776, 0.0636772066, 0.0464280061, -0.0182630867, -0.0207648799, 0.0231086649, 0.0279147401, -0.0423198007, -0.1100788787, -0.0120876096, -0.0040785805, -0.0273090433, 0.0511945821, -0.0026713221, -0.0638352185, -0.0928560123, 0.0006842897, -0.0251100995, 0.0288101193, -0.0565668494, -0.0181709155, 0.0181709155, -0.0141680473, 0.0343403965, 0.0757384822, -0.011185647, -0.0193428081, 0.0689968094, -0.0311539043, -0.0137071908, -0.0944360942, 0.0990183204 ]
801.1999
Wolfgang Staubach
Wilhelm Schlag, Avy Soffer, Wolfgang Staubach
Decay for the wave and Schroedinger evolutions on manifolds with conical ends, Part I
32 pages, This paper differs in terms of both generalizations and improvement of the exposition from the paper "Decay estimates for the Schroedinger evolution on asymptotically conic surfaces of revolution, Part I", and is therefore posted as a new paper
null
null
null
math.AP math-ph math.MP
null
Global in time dispersive estimates for the Schroedinger and wave evolutions are obtained on manifolds with conical ends whose Hamiltonian flow exhibits trapping. This paper deals with the case of initial data with "zero angular momentum".
[ { "version": "v1", "created": "Mon, 14 Jan 2008 01:36:45 GMT" } ]
2008-01-15T00:00:00
[ [ "Schlag", "Wilhelm", "" ], [ "Soffer", "Avy", "" ], [ "Staubach", "Wolfgang", "" ] ]
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801.2
Qingjun Liu
Qing-Jun Liu and Wei-Qin Zhao
Elastic parton scattering and non-statistical event-by-event mean-pt fluctuations in Au + Au collisions at RHIC
6 pages, 3 figures
Phys.Rev.C77:034902,2008
10.1103/PhysRevC.77.034902
null
nucl-th
null
Non-statistical event-by-event mean-pt fluctuations in Au + Au collisions at sqrt(s_NN) = 130 and 200 GeV are analyzed in AMPT with string-melting, and the results are compared with STAR data. The analysis suggests that in-medium elastic parton scattering may contribute greatly to the mean-p_t fluctuations in relativistic heavy-ion collisions. Furthermore, it is demonstrated that non-statistical event-by-event mean-pt fluctuations can be used to probe the initial partonic dynamics in these collisions. The comparison shows that with an in-medium elastic parton scattering cross section sigma_p=10 mb, AMPT with string-melting can well reproduce sqrt(s_NN) = 130 GeV data on the centrality dependence of non-statistical event-by-event mean-pt fluctuations. The comparison also shows that the fluctuation data for sqrt(s_NN) = 200 GeV Au + Au collisions can be well reproduced with sigma_p between 6 and 10 mb.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 01:58:19 GMT" } ]
2008-11-26T00:00:00
[ [ "Liu", "Qing-Jun", "" ], [ "Zhao", "Wei-Qin", "" ] ]
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801.2001
Wolfgang Staubach
Wilhelm Schlag, Avy Soffer, Wolfgang Staubach
Decay for the wave and Schroedinger evolutions on manifolds with conical ends, Part II
28 pages
null
null
null
math.AP math-ph math.MP
null
Global in time dispersive estimates for the Schroedinger and wave evolutions are obtained on manifolds with conical ends whose Hamiltonian flow exhibits trapping. This paper deals with the case of initial data with fixed "nonzero angular momentum".
[ { "version": "v1", "created": "Mon, 14 Jan 2008 01:40:33 GMT" } ]
2008-01-15T00:00:00
[ [ "Schlag", "Wilhelm", "" ], [ "Soffer", "Avy", "" ], [ "Staubach", "Wolfgang", "" ] ]
[ 0.0675445125, 0.1350890249, 0.0375914127, 0.0566326343, -0.0370730981, 0.0820573047, -0.0245926399, 0.0035770494, -0.0315080397, 0.0095888106, 0.0467573889, 0.0030826048, -0.0779653564, 0.0487760864, 0.0039078156, 0.0821118653, -0.0472484231, -0.0083066653, 0.0812934786, 0.1533118486, -0.0942786038, -0.0885498747, 0.0200914908, 0.0817299485, -0.0032104785, -0.0581602976, -0.0510948598, 0.0765468106, 0.0669989213, -0.0759466588, 0.0272660498, -0.0464845896, -0.0626341701, 0.0138376225, -0.0601244345, 0.231986478, -0.0692358539, 0.0320809148, -0.1429455727, 0.0528953187, -0.0119826039, -0.0217828322, -0.0798749328, 0.1730623543, 0.0611610636, -0.0122417603, -0.0785655081, 0.0053093098, 0.0414924063, -0.0433201455, -0.0393100344, -0.0011875189, 0.0983159989, 0.0047466662, -0.0351362415, -0.076274015, 0.055514168, 0.0378369279, -0.0504401475, -0.0669989213, 0.0261339433, -0.0536864288, -0.0721820593, 0.06307064, -0.0828756988, -0.0413014516, -0.1131561548, 0.0273888092, -0.0532499552, 0.0868039727, -0.0889317915, 0.0395282693, 0.0144855147, 0.0643255115, -0.0522951633, -0.0186456684, -0.0406467393, 0.0119757839, 0.0132306498, 0.1308333874, 0.0161359366, -0.0226148628, 0.0611610636, -0.0401011445, -0.0169816073, 0.0115461284, 0.0515858941, -0.0127191553, -0.0682537854, 0.0129101127, -0.0230786167, 0.101316765, -0.0364183858, -0.0017851146, 0.0897501782, -0.1002255827, 0.0930237398, 0.0214963946, 0.0003789319, -0.0352180786, -0.0091932556, -0.0010170209, 0.0735460445, -0.0224375445, 0.2099444866, -0.0545048192, -0.0312625244, 0.024838157, -0.0822755471, -0.0380551666, 0.0420107208, -0.0593606047, -0.0389553979, 0.0751828253, -0.0299530998, -0.0371822156, -0.0510130189, 0.0566871949, -0.0823301002, 0.0889863446, 0.0161768552, 0.001359722, -0.0040510339, 0.0222875066, 0.0820027441, -0.0370185375, -0.0664533228, -0.0542047434, -0.0615429804, -0.0086613018, 0.0198323335, -0.0303077344, -0.0418197624, -0.1698979139, -0.0792202204, 0.0417652056, 0.0600698777, 0.06956321, 0.0569054335, -0.0238697287, 0.0692358539, 0.0374277346, 0.0090432167, 0.0052172407, 0.0751828253, 0.1097189113, -0.0078701908, 0.097388491, 0.0521314852, -0.0650893375, -0.0176635999, 0.0202006102, 0.053550031, 0.0715819076, 0.0373458937, 0.0517768525, 0.0554868877, 0.0515858941, 0.0263794605, -0.057887502, -0.0003780795, 0.0272251293, 0.0079793092, -0.064598307, 0.0870767683, -0.0516677313, -0.0394464321, -0.0621431321, -0.0116757071, -0.1053541601, 0.0116484277, -0.1097189113, -0.0840760022, -0.0668898001, 0.0594151653, 0.0134829869, -0.0621976927, -0.1294148415, -0.09416949, 0.0059128725, 0.0111028338, 0.1326884031, -0.0261339433, 0.01749992, -0.0012650957, 0.0353817567, 0.0035940991, 0.0410286523, -0.0217009932, 0.0038157466, -0.0812934786, 0.109773472, 0.0901320949, 0.0151538672, 0.0106731784, -0.0538501069, 0.1091733202, 0.0205279663, 0.0142399976, -0.0887681097, 0.0300894976, -0.0796566904, 0.0208416823, 0.0216737129, -0.0332539417, 0.024756318, 0.0590332486, 0.0778016746, 0.0413014516, 0.0042010723, 0.0254519507, -0.0348907225, 0.0787837431, 0.0363911055, -0.1042629704, -0.0555414483, -0.0765468106, -0.0234605335, -0.0065403054, 0.1063362285, -0.0854945481, 0.1077002138, 0.0737097189, 0.054886736, 0.0498399921, -0.0187957063, 0.0619248971, -0.0216464344, 0.0420107208, 0.0123099601, 0.0271978509, -0.073273249, -0.1176300198, 0.0269659739, -0.0338268168, -0.0810206756, -0.0150583889, -0.0042726812, 0.0097388495, -0.0618703365, -0.0627432838, 0.0214554761, 0.0361728668, 0.0480395332, -0.0301167779, 0.0342087299, -0.0224239044, 0.0278662033, 0.0690176114, -0.0436475016, -0.0126645956, 0.0240743253, 0.0721274987, 0.0750191435, 0.0260111839, -0.0247426778 ]
801.2002
Nirav Mehta
N. P. Mehta, Seth T. Rittenhouse, J. P. D'Incao, Chris H. Greene
Efimov states embedded in the three-body continuum
4 pages 3 figures
Phys. Rev. A 78, 020701 (2008)
10.1103/PhysRevA.78.020701
null
cond-mat.other
null
We consider a multichannel generalization of the Fermi pseudopotential to model low-energy atom-atom interactions near a magnetically tunable Feshbach resonance, and calculate the adiabatic hyperspherical potential curves for a system of three such interacting atoms. In particular, our model suggests the existence of a series of quasi-bound Efimov states attached to excited three-body thresholds, far above open channel collision energies. We discuss the conditions under which such states may be supported, and identify which interaction parameters limit the lifetime of these states. We speculate that it may be possible to observe these states using spectroscopic methods, perhaps allowing for the measurement of multiple Efimov resonances for the first time.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 02:25:13 GMT" } ]
2009-11-13T00:00:00
[ [ "Mehta", "N. P.", "" ], [ "Rittenhouse", "Seth T.", "" ], [ "D'Incao", "J. P.", "" ], [ "Greene", "Chris H.", "" ] ]
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801.2003
Max Spolaor
Max Spolaor (1), Duncan A. Forbes (1), George K. T. Hau (1,2), Robert N. Proctor (1), Sarah Brough (1) ((1) Centre for Astrophysics and Supercomputing, Swinburne University of Technology, (2) Department of Physics, University of Durham)
The early-type galaxies NGC 1407 and NGC 1400 - I: spatially resolved radial kinematics and surface photometry
11 pages, 6 tables, 6 figures, Accepted for publication in MNRAS
null
10.1111/j.1365-2966.2008.12891.x
null
astro-ph
null
This is the first paper of a series focused on investigating the star formation and evolutionary history of the two early-type galaxies NGC 1407 and NGC 1400. They are the two brightest galaxies of the NGC 1407 (or Eridanus-A) group, one of the 60 groups studied as part of the Group Evolution Multi-wavelength Study (GEMS). Here we present new high signal-to-noise long-slit spectroscopic data obtained at the ESO 3.6m telescope and high-resolution multi-band imaging data from the HST/ACS and wide-field imaging from Subaru Suprime-Cam. We spatially resolved integrated spectra out to 0.6 (NGC 1407) and 1.3 (NGC 1400) effective radii. The radial profiles of the kinematic parameters v(rot), sigma, h3 and h4 are measured. The surface brightness profiles are fitted to different galaxy light models and the colour distributions analysed. The multi-band images are modelled to derive isophotal shape parameters and residual galaxy images. The parameters from the surface brightness profile fitting are used to estimate the mass of the possible central supermassive black hole in NGC 1407. The galaxies are found to be rotationally supported and to have a flat core in the surface brightness profiles. Elliptical isophotes are observed at all radii and no fine structures are detected in the residual galaxy images. From our results we can also discard a possible interaction between NGC 1400, NGC 1407 and the group intergalactic medium. We estimate a mass of 1.03x10^9 M(sun) for the supermassive black hole in NGC 1407 galaxy.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 03:44:51 GMT" } ]
2009-11-13T00:00:00
[ [ "Spolaor", "Max", "" ], [ "Forbes", "Duncan A.", "" ], [ "Hau", "George K. T.", "" ], [ "Proctor", "Robert N.", "" ], [ "Brough", "Sarah", "" ] ]
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801.2004
Yanxia Zhang
Dan Gao, Yanxia Zhang and Yongheng Zhao
The Application of kd-tree in Astronomy
4 pages, 3 tables, ADASS XVII conference
null
null
null
astro-ph
null
The basic idea of the kd-tree algorithm is to recursively partition a point set P by hyperplanes, and to store the obtained partitioning in a binary tree. Due to its immense popularity, many applications in astronomy have been implemented. The algorithm can been used to solve a near neighbor problem for cross-identification of huge catalogs and realize the classification of astronomical objects. Since kd-tree can speed up query and partition spaces, some approaches based on it have been applied for photometric redshift measurement. We give the case studies of kd-tree in astronomy to show its importance and performance.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 03:21:32 GMT" } ]
2008-01-15T00:00:00
[ [ "Gao", "Dan", "" ], [ "Zhang", "Yanxia", "" ], [ "Zhao", "Yongheng", "" ] ]
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801.2005
Max Spolaor
Max Spolaor (1), Duncan A. Forbes (1), Robert N. Proctor (1), George K. T. Hau (1,2), Sarah Brough (1)((1) Centre for Astrophysics and Supercomputing, Swinburne University, (2) Department of Physics, University of Durham)
The early-type galaxies NGC 1407 and NGC 1400 - II: star formation and chemical evolutionary history
14 pages, 9 tables, 6 figures, Accepted for publication in MNRAS
null
10.1111/j.1365-2966.2008.12892.x
null
astro-ph
null
We present a possible star formation and chemical evolutionary history for two early-type galaxies NGC 1407 and NGC 1400. They are the two brightest galaxies of the NGC 1407 (or Eridanus-A) group, one of the 60 groups studied as part of the Group Evolution Multi-wavelength Study (GEMS). Our analysis is based on new high signal-to-noise spatially resolved integrated spectra obtained at the ESO 3.6m telescope, out to 0.6 (NGC 1407) and 1.3 (NGC 1400) effective radii. Using Lick/IDS indices we estimate luminosity-weighted ages, metallicities and $\alpha$-element abundance ratios. Colour radial distributions from HST/ACS and Subaru Suprime-Cam multi-band wide-field imaging are compared to colours predicted from spectroscopically determinated ages and metallicities using single stellar population models. The galaxies formed over half of their mass in a single short-lived burst of star formation (> 100 M(sun)/year) at redshift z>5. This likely involved an outside-in mechanism with supernova-driven galactic winds, as suggested by the flatness of the alpha-element radial profiles and the strong negative metallicity gradients. Our results support the predictions of the revised version of the monolithic collapse model for galaxy formation and evolution. We speculate that, since formation the galaxies have evolved quiescently and that we are witnessing the first infall of NGC 1400 in the group.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 03:49:26 GMT" } ]
2009-11-13T00:00:00
[ [ "Spolaor", "Max", "" ], [ "Forbes", "Duncan A.", "" ], [ "Proctor", "Robert N.", "" ], [ "Hau", "George K. T.", "" ], [ "Brough", "Sarah", "" ] ]
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801.2006
Jason Behrstock
Jason Behrstock, Bruce Kleiner, Yair Minsky, Lee Mosher
Geometry and rigidity of mapping class groups
Version 4, 98 pages. Cleaned up some notation involving the partial order on subsurfaces (at the end of section 4).
null
null
null
math.GT math.GR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the large scale geometry of mapping class groups MCG(S), using hyperbolicity properties of curve complexes. We show that any self quasi-isometry of MCG(S) (outside a few sporadic cases) is a bounded distance away from a left-multiplication, and as a consequence obtain quasi-isometric rigidity for MCG(S), namely that groups quasi-isometric to MCG(S) are virtually equal to it. (The latter theorem was proved by Hamenstadt using different methods). As part of our approach we obtain several other structural results: a description of the tree-graded structure on the asymptotic cone of MCG(S); a characterization of the image of the curve-complex projection map from MCG(S) to the product of the curve complexes of essential subsurfaces of S; and a construction of Sigma-hulls in MCG(S), an analogue of convex hulls.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 03:48:14 GMT" }, { "version": "v2", "created": "Sat, 3 May 2008 18:19:08 GMT" }, { "version": "v3", "created": "Mon, 23 Feb 2009 17:07:52 GMT" }, { "version": "v4", "created": "Fri, 9 Apr 2010 18:09:43 GMT" } ]
2010-04-12T00:00:00
[ [ "Behrstock", "Jason", "" ], [ "Kleiner", "Bruce", "" ], [ "Minsky", "Yair", "" ], [ "Mosher", "Lee", "" ] ]
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801.2007
Qiang Yuan
Qiang Yuan, Tong-Jie Zhang, Bao-Quan Wang
Reconstruction of Gas Temperature and Density Profiles of the Galaxy Cluster RX J1347.5-1145
6 pages, 1 figure. The published version, 2008, Chin. J. Astron. Astrophys., 8, 671
Chin.J.Astron.Astrophys.8:671-676, 2008
10.1088/1009-9271/8/6/05
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We use observations of Sunyaev-Zel'dovich effect and X-ray surface brightness to reconstruct the radial profiles of gas temperature and density under the assumption of a spherically symmetric distribution of the gas. The method of reconstruction, first raised by Silk & White, depends directly on the observations of the Sunyaev-Zel'dovich effect and the X-ray surface brightness, without involving additional assumptions such as the equation of state of the gas or the conditions of hydrostatic equilibrium. We applied this method to the cluster RX J1347.5-1145, which has both the Sunyaev-Zel'dovich effect and X-ray observations with relative high precision. It is shown that it will be an effective method to obtain the gas distribution in galaxy clusters. Statistical errors of the derived temperature and density profiles of gas were estimated according to the observational uncertainties.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 03:42:23 GMT" }, { "version": "v2", "created": "Mon, 3 Mar 2008 11:39:17 GMT" }, { "version": "v3", "created": "Sun, 14 Dec 2008 04:03:50 GMT" } ]
2009-06-23T00:00:00
[ [ "Yuan", "Qiang", "" ], [ "Zhang", "Tong-Jie", "" ], [ "Wang", "Bao-Quan", "" ] ]
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801.2008
Tiberiu Harko
C. S. J. Pun, L. \'A. Gergely, M. K. Mak, Z. Kov\'acs, G. M. Szab\'o, T. Harko
Viscous dissipative Chaplygin gas dominated homogenous and isotropic cosmological models
14 pages, 9 figures, to appear in PRD
Phys.Rev.D77:063528,2008
10.1103/PhysRevD.77.063528
null
gr-qc astro-ph hep-th
null
The generalized Chaplygin gas, which interpolates between a high density relativistic era and a non-relativistic matter phase, is a popular dark energy candidate. We consider a generalization of the Chaplygin gas model, by assuming the presence of a bulk viscous type dissipative term in the effective thermodynamic pressure of the gas. The dissipative effects are described by using the truncated Israel-Stewart model, with the bulk viscosity coefficient and the relaxation time functions of the energy density only. The corresponding cosmological dynamics of the bulk viscous Chaplygin gas dominated universe is considered in detail for a flat homogeneous isotropic Friedmann-Robertson-Walker geometry. For different values of the model parameters we consider the evolution of the cosmological parameters (scale factor, energy density, Hubble function, deceleration parameter and luminosity distance, respectively), by using both analytical and numerical methods. In the large time limit the model describes an accelerating universe, with the effective negative pressure induced by the Chaplygin gas and the bulk viscous pressure driving the acceleration. The theoretical predictions of the luminosity distance of our model are compared with the observations of the type Ia supernovae. The model fits well the recent supernova data. From the fitting we determine both the equation of state of the Chaplygin gas, and the parameters characterizing the bulk viscosity. The evolution of the scalar field associated to the viscous Chaplygin fluid is also considered, and the corresponding potential is obtained. Hence the viscous Chaplygin gas model offers an effective dynamical possibility for replacing the cosmological constant, and to explain the recent acceleration of the universe.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 03:52:51 GMT" } ]
2008-11-26T00:00:00
[ [ "Pun", "C. S. J.", "" ], [ "Gergely", "L. Á.", "" ], [ "Mak", "M. K.", "" ], [ "Kovács", "Z.", "" ], [ "Szabó", "G. M.", "" ], [ "Harko", "T.", "" ] ]
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801.2009
Athanasios Gentimis
Thanos Gentimis
On Limit Aperiodic G-Sets
9 pages,0 figures
null
null
null
math.GN math.GR
null
We prove that the property to be limit aperiodic is preserved by the standard construction with groups like extension, HNN extension and free product. We also construct a non-limit aperiodic G-space.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 04:38:33 GMT" } ]
2008-01-15T00:00:00
[ [ "Gentimis", "Thanos", "" ] ]
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801.201
Dillon Mayhew
Rhiannon Hall and Dillon Mayhew
Contracting an element from a cocircuit
23 pages, 1 figure. Minor changes to introduction
null
null
null
math.CO
null
We consider the situation that M and N are 3-connected matroids such that |E(N)| > 3 and C* is a cocircuit of M with the property that M/y has an N-minor for some y in C*. We show that either there is an element x in C* such that si(M/x) or co(si(M/x)) is 3-connected with an N-minor, or there is a four-element fan of M that contains two elements of C* and an element x such that si(M/x) is 3-connected with an N-minor.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 04:48:59 GMT" }, { "version": "v2", "created": "Mon, 14 Apr 2008 05:44:11 GMT" } ]
2008-04-14T00:00:00
[ [ "Hall", "Rhiannon", "" ], [ "Mayhew", "Dillon", "" ] ]
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801.2011
C. Q. Geng
Chian-Shu Chen, Chao-Qiang Geng and Dmitry V. Zhuridov
Same-sign single dilepton productions at the LHC
10 pages, 5 figures
Phys.Lett.B666:340-343,2008
10.1016/j.physletb.2008.07.088
null
hep-ph
null
We examine the same-sign single dilepton productions of $\ell_i^{\pm}\ell_j^{\pm} (\ell_{i,j}=e,\mu)$ in high-energy proton-proton collisions at the Large Hadron Collider (LHC) in models with doubly charged Higgs scalars as well as heavy Majorana neutrinos. We demonstrate that these spectacular productions can be detected at the LHC for a class model in which the doubly charged Higgs scalars couple only to the right-handed charged leptons. The ranges of the possible doubly charged Higgs masses and mixings to observe the processes at the LHC are discussed.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 04:50:15 GMT" } ]
2008-11-26T00:00:00
[ [ "Chen", "Chian-Shu", "" ], [ "Geng", "Chao-Qiang", "" ], [ "Zhuridov", "Dmitry V.", "" ] ]
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801.2012
Taejung Kim
Taejung Kim
The linear flows in the space of Krichever-Lax matrices over an algebraic curve
null
null
null
null
math.DS math.AG
null
In \cite{kri02}, I. M. Krichever invented the space of matrices parametrizing the cotangent bundle of moduli space of stable vector bundles over a compact Riemann surface, which is named as the Hitchin system after the investigation \cite{hit87}. We study a necessary and sufficient condition for the linearity of flows on the space of Krichever-Lax matrices in a Lax representation in terms of cohomological classes using the similar technique and analysis from the work \cite{grif85} by P. A. Griffiths.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 04:58:57 GMT" } ]
2008-01-15T00:00:00
[ [ "Kim", "Taejung", "" ] ]
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801.2013
Piotr Bizon
Piotr Bizo\'n
Huygens' principle and anomalously small radiation tails
9 pages, for the proceedings of the Mathisson conference held in Warsaw, 2007
Acta Phys.Polon.Supp.1:77,2008
null
null
math-ph gr-qc math.MP
null
This is a short account of recent joint work with T. Chmaj and A. Rostworowski on asymptotic behavior of linear and nonlinear waves, as presented at the conference devoted to Myron Mathisson held at the Banach Center, Warsaw 2007.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 05:17:25 GMT" } ]
2011-03-28T00:00:00
[ [ "Bizoń", "Piotr", "" ] ]
[ 0.0051152231, 0.1164349169, 0.0308043845, 0.0061926702, -0.024219593, 0.0303804707, -0.045528315, -0.0627957284, -0.0146391476, -0.0306065567, -0.1059783846, -0.0536391921, -0.1441306025, 0.0676000789, -0.0330087356, 0.1348610222, -0.0193445869, 0.01081686, 0.0055144085, 0.0823522732, -0.1370088607, -0.0841044486, 0.010880447, 0.0163348019, 0.0044051684, -0.037643522, 0.0131059932, 0.0668652952, 0.1745393276, 0.007920118, 0.045810923, -0.0389717855, -0.0487783179, -0.078282699, -0.06980443, 0.1020218581, -0.0315391682, 0.0353826508, 0.0367674343, 0.0401022211, -0.0620044209, -0.0319065601, -0.0775479153, 0.088908799, 0.0383217819, 0.059347894, 0.0362304784, 0.0783957466, 0.0523109287, 0.0579913706, -0.0327261239, 0.0065035401, 0.0792435706, -0.0063198442, -0.1914958805, -0.0395370014, 0.1263827533, 0.0425043963, -0.0440304875, -0.0447087474, 0.0846696645, -0.0434370078, -0.0548826717, -0.0942218453, -0.0085065318, -0.0437196158, -0.0248130728, -0.0332913436, -0.0116222957, -0.0599696338, 0.0280206855, -0.0416848324, -0.0871001035, -0.0126326233, -0.037643522, -0.0033966072, -0.0075739217, -0.0687305182, -0.0745522603, 0.1114044785, 0.0084005529, 0.0171119757, -0.0094179455, -0.0854609683, -0.0247282889, 0.0224956777, -0.0092342496, -0.0310304705, -0.1015696824, 0.0535261482, 0.0656783357, 0.0540913679, 0.0105059901, -0.0207152423, 0.0679957345, -0.029447861, 0.1191479638, -0.0058288113, 0.0471957065, -0.0061043547, 0.0302956868, 0.0317087322, 0.0586131103, -0.0552500635, 0.0414587446, 0.0572848506, -0.0251239426, -0.099534899, -0.0462065749, 0.0503609292, 0.0105978381, -0.037784826, -0.0518870167, 0.0061750072, -0.110160999, -0.0051964736, -0.1015696824, 0.0932044536, 0.0200511105, -0.0094956635, 0.0127315363, -0.0031175308, 0.0788479149, 0.0083864229, 0.1269479692, -0.0602522455, 0.0878914073, -0.054289192, -0.0030769059, -0.0358065628, 0.0636435524, -0.0901522785, -0.0317652561, -0.0308891665, -0.0560413711, -0.0110853389, 0.1068827361, 0.0000774967, 0.0911131501, 0.0128516452, 0.088626191, 0.086195752, 0.0952392444, -0.0751740038, 0.0640957281, 0.1296610236, 0.0613826811, 0.0619478971, 0.0379826538, -0.0389717855, -0.0240924191, 0.0164478458, 0.0046241903, 0.0577370226, -0.0362022147, -0.0559848472, 0.1107262149, 0.0449348353, -0.0523957126, -0.0140597988, 0.0197543707, 0.0318782963, -0.101965338, 0.0272011179, 0.0474500544, 0.008075553, -0.0213087201, -0.0445674434, -0.0554196313, -0.0898131505, -0.1102175191, -0.0691261664, 0.0126820803, 0.0656218156, 0.0994783789, 0.1176783964, -0.0517457128, -0.083143577, -0.105017513, -0.0432957038, -0.0147239305, 0.0651696399, 0.0914522782, -0.0581609383, -0.0334326476, 0.0023226929, -0.0030574764, 0.0910001025, 0.0105978381, -0.0415152647, -0.0505587533, 0.0137347989, 0.0007921884, 0.0683913827, 0.0317087322, -0.115643613, 0.0253500286, 0.029532643, -0.0434935279, 0.0687305182, -0.0264380742, -0.0029320687, 0.089191407, -0.0682783425, -0.035071779, 0.0611565933, 0.0696913823, 0.0949001089, -0.076134868, 0.0118625136, 0.0422783084, -0.0292217731, 0.0819566175, 0.016080454, 0.0086831627, -0.0397913493, -0.051152233, 0.1624436677, 0.0882870629, 0.1404001564, -0.1182436123, 0.0634739846, 0.0630783364, 0.0863653198, 0.0654522479, 0.0339130834, -0.0109581649, 0.0308609046, 0.0328674279, 0.0615522452, 0.0728000849, -0.0462065749, -0.0388304815, 0.0228630695, 0.0244315509, 0.0291652512, 0.0486087538, 0.0156565402, -0.1033218578, -0.040384829, -0.0461500548, 0.0340543874, -0.0339413434, -0.0029779926, -0.0738739967, -0.0290239472, 0.0048714732, 0.0585000664, 0.0420239605, -0.1286436319, 0.0601957217, 0.0414304845, 0.0275261197, 0.0016594449, -0.0483261421, 0.0231739394 ]
801.2014
Matthew Ballard
Matthew Robert Ballard
Meet homological mirror symmetry
34 pages. Published version. Comments still very welcome
Modular forms and string duality, 191--224, Fields Inst. Commun., 54, Amer. Math. Soc., Providence, RI, 2008
null
null
math.AG math.CT math.SG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we introduce the interested reader to homological mirror symmetry. After recalling a little background knowledge, we tackle the simplest cases of homological mirror symmetry: curves of genus zero and one. We close by outlining the current state of the field and mentioning what homo- logical mirror symmetry has to say about other aspects of mirror symmetry.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 05:24:51 GMT" }, { "version": "v2", "created": "Tue, 19 May 2009 17:42:24 GMT" } ]
2009-05-19T00:00:00
[ [ "Ballard", "Matthew Robert", "" ] ]
[ 0.0283258874, -0.0245522074, 0.0426285975, 0.0870275572, -0.0318899155, 0.0004764415, -0.0183442738, -0.0582357869, -0.0271611717, -0.0317967385, -0.0178434458, -0.1281187385, -0.011216213, -0.0243658535, 0.0864684954, 0.0781291351, -0.000676991, 0.0155023662, 0.1018427461, 0.1087378636, -0.0141512966, -0.0484987646, 0.0177386198, 0.0135456445, -0.0582357869, 0.0000325984, -0.0035815008, -0.0487782955, 0.1240189299, -0.0870741457, 0.0145007111, -0.048731707, -0.0045656855, -0.0011399655, -0.114701204, 0.2150531113, 0.0055702529, 0.0486385301, -0.0189033356, 0.1231803373, -0.008182128, 0.0633605346, 0.0173193235, 0.0061089341, -0.0514804348, -0.0665751547, 0.0031418207, -0.0048801592, -0.0370845497, -0.0132544655, -0.0322160386, 0.0638730079, 0.0944351554, 0.0211512372, -0.0698363557, 0.0509213731, -0.057350602, 0.0513872579, -0.0534837469, -0.0419530608, 0.0207202937, 0.0504554845, -0.064711608, -0.0030224374, -0.0516202003, -0.0093759615, -0.0968111753, 0.0439796671, 0.0307019074, 0.0326120406, 0.0516667888, 0.0251578595, -0.0182743892, 0.0963452831, 0.0076696533, -0.0544155203, -0.0258799829, 0.16576235, 0.043653544, -0.0486851186, 0.0184141565, -0.0077162418, 0.0752406344, 0.0259498674, -0.0797131434, -0.0019479871, 0.1053834781, 0.0135456445, -0.077197358, 0.0814369246, 0.1215031445, 0.0212444142, 0.0164108444, -0.0056139301, 0.0460761562, -0.1314731091, 0.0415803529, -0.0062312293, -0.0394605696, 0.0797597319, 0.0053518689, 0.0110880937, 0.0086247204, -0.0735634491, 0.1029608697, -0.0242493823, 0.0115772747, -0.1076197326, -0.040881522, 0.0516667888, -0.1156329811, -0.0758928806, 0.0557200015, -0.0309115555, 0.0557200015, 0.1078060865, 0.0221528932, -0.0444222577, -0.0806449205, -0.0711874291, -0.0303524919, -0.0798063204, -0.0042453888, -0.1050107703, 0.0522724427, -0.0427450687, 0.0059633446, -0.0126371654, -0.0111463293, -0.0139998831, 0.1668804735, 0.032262627, -0.0083976006, -0.0461693332, 0.0037067079, -0.0536701009, 0.0470778085, -0.0040881522, 0.0316336788, -0.0191246327, 0.0515736118, -0.0127186961, 0.0857230797, -0.0207785293, 0.1398590654, 0.0246686786, -0.028978128, 0.1232735142, -0.044864852, 0.0286054183, -0.0037824144, -0.0647581965, 0.0954135135, 0.0359897166, -0.0125556355, -0.0224673674, 0.0681125745, -0.0062428764, -0.0585153177, 0.0852571949, 0.0756133422, 0.0502225421, -0.0136388214, 0.0270679928, -0.027580468, 0.0452841483, -0.0999791995, 0.0354073569, -0.0112977428, -0.0982088298, 0.021034766, -0.0423024744, -0.0534371585, -0.0320529789, -0.0185189806, 0.1355729103, -0.040881522, -0.1879385263, -0.0435137786, 0.0244823247, 0.0730043799, 0.0498498343, 0.0552541129, -0.036315836, -0.0302360207, 0.0345687643, 0.0552075244, -0.0881456882, -0.0467283949, 0.0008779045, -0.1748937219, 0.0894035771, 0.0696965903, 0.0712340176, 0.0878661573, -0.0899626464, 0.0398332775, 0.0483589992, -0.0112045649, -0.0708613023, 0.0408116393, -0.1232735142, 0.0591209717, 0.0205921736, -0.0649445504, -0.014978244, 0.0617765225, 0.0323790982, -0.1118127108, 0.005212103, 0.0053111035, 0.0267185792, 0.0402525775, 0.0352675915, 0.021628771, 0.0291877761, -0.0152577758, -0.0472641662, 0.0943419784, 0.1679054201, -0.0319132097, 0.0295604859, 0.0930374935, 0.0167369656, 0.0513872579, 0.053297393, 0.045354031, -0.0930374935, -0.0615435801, -0.0033602049, 0.1034267545, -0.0282792989, -0.0179133285, 0.0323325098, 0.0001713406, -0.0276270565, 0.0054071927, -0.0410212874, -0.0545552857, -0.0536235124, 0.0145123582, 0.0664353892, -0.0205921736, 0.0124857528, 0.0293974243, 0.0149433026, -0.0949476287, -0.1135830805, 0.0743088648, -0.0862821415, 0.041976355, 0.0487782955, -0.0332875773, 0.0334273428, -0.080598332, 0.0382259712 ]
801.2015
Takaya Nozawa
T. Nozawa, T. Kozasa, N. Tominaga, I. Sakon, M. Tanaka, T. Suzuki, K. Nomoto, K. Maeda, H. Umeda, M. Limongi, T. Onaka
Early Formation of Dust in the Ejecta of Type Ib SN 2006jc and Temperature and Mass of the Dust
25 pages including 6 figures and 1 table. Accepted for publication in ApJ
null
10.1086/589961
null
astro-ph
null
SN 2006jc is a peculiar supernova (SN), in which the formation of dust has been confirmed at an early epoch of ~50 days after the explosion. We investigate the possibility of such an earlier formation of dust grains in the expanding ejecta of SN 2006jc, applying the Type Ib SN model that is developed to reproduce the observed light curve. We find that the rapid decrease of the gas temperature in SN 2006jc enables the condensation of C grains in the C-rich layer at 40-60 days after the explosion, which is followed by the condensation of silicate and oxide grains until ~200 days. The average radius of each grain species is confined to be less than 0.01 micron due to the low gas density at the condensation time. The calculated total dust mass reaches ~1.5 Msun, of which C dust shares 0.7 Msun. On the other hand, based on the calculated dust temperature, we show that the dust species and mass evaluated to reproduce the spectral energy distribution observed by AKARI and MAGNUM at day 200 are different from those obtained by the dust formation calculations; the dust species contributing to the observed flux are hot C and FeS grains with masses of $5.6 \times 10^{-4}$ Msun and $2.0 \times 10^{-3}$ Msun, respectively, though we cannot defy the presence of a large amount of cold dust such as silicate and oxide grains up to 0.5 Msun. One of the physical processes responsible for the difference between calculated and evaluated masses of C and FeS grains could be considered to be the destruction of small-sized clusters by energetic photons and electrons prevailing within the ejecta at the earlier epoch.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 05:34:37 GMT" }, { "version": "v2", "created": "Tue, 20 May 2008 08:05:23 GMT" } ]
2009-11-13T00:00:00
[ [ "Nozawa", "T.", "" ], [ "Kozasa", "T.", "" ], [ "Tominaga", "N.", "" ], [ "Sakon", "I.", "" ], [ "Tanaka", "M.", "" ], [ "Suzuki", "T.", "" ], [ "Nomoto", "K.", "" ], [ "Maeda", "K.", "" ], [ "Umeda", "H.", "" ], [ "Limongi", "M.", "" ], [ "Onaka", "T.", "" ] ]
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801.2016
Peter Moran
Peter J. Moran and Derek B. Leinweber
Impact of Dynamical Fermions on QCD Vacuum Structure
9 pages, 8 figures
Phys.Rev.D78:054506,2008
10.1103/PhysRevD.78.054506
ADP-08-02/T661
hep-lat
null
We examine how dynamical fermions affect both the UV and infrared structure of the QCD vacuum. We consider large $28^3 \times 96$ lattices from the MILC collaboration, using a gluonic definition of the topological charge density, founded on a new over-improved stout-link smearing algorithm. The algorithm reproduces established results from the overlap formalism and is designed to preserve nontrivial topological objects including instantons. At short distances we focus on the topological charge correlator, $<q(x) q(0) >$, where negative values at small $x$ reveal a sign-alternating layered structure to the topological-charge density of the QCD vacuum. We find that the magnitudes of the negative dip in the $<q(x)q(0)>$ correlator and the positive $<q(0)^2>$ contact term are both increased with the introduction of dynamical fermion degrees of freedom. This is in accord with expectations based on charge renormalization and the vanishing of the topological susceptibility in the chiral limit. At large distances we examine the extent to which instanton-like objects are found on the lattice, and how their distributions vary between quenched and dynamical gauge fields. We show that dynamical gauge fields contain more instanton-like objects with an average size greater than in the quenched vacuum. Finally, we directly visualize the topological charge density in order to investigate the effects of dynamical sea-quark degrees of freedom on topology.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 05:41:24 GMT" } ]
2009-01-09T00:00:00
[ [ "Moran", "Peter J.", "" ], [ "Leinweber", "Derek B.", "" ] ]
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801.2017
Sanil Unnikrishnan
Sanil Unnikrishnan, H. K. Jassal, T. R. Seshadri
Scalar Field Dark Energy Perturbations and their Scale Dependence
12 pages, 13 figures, added new section, accepted for publication in Phys. Rev. D
Phys.Rev.D78:123504,2008
10.1103/PhysRevD.78.123504
null
astro-ph gr-qc
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We estimate the amplitude of perturbation in dark energy at different length scales for a quintessence model with an exponential potential. It is shown that on length scales much smaller than hubble radius, perturbation in dark energy is negligible in comparison to that in in dark matter. However, on scales comparable to the hubble radius ($\lambda_{p}>1000\mathrm{Mpc}$) the perturbation in dark energy in general cannot be neglected. As compared to the $\Lambda$CDM model, large scale matter power spectrum is suppressed in a generic quintessence dark energy model. We show that on scales $\lambda_{p} < 1000\mathrm{Mpc}$, this suppression is primarily due to different background evolution compared to $\Lambda$CDM model. However, on much larger scales perturbation in dark energy can effect matter power spectrum significantly. Hence this analysis can act as a discriminator between $\Lambda$CDM model and other generic dark energy models with $w_{de} \neq -1$.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 06:48:34 GMT" }, { "version": "v2", "created": "Wed, 9 Apr 2008 08:19:46 GMT" }, { "version": "v3", "created": "Thu, 6 Nov 2008 17:22:10 GMT" } ]
2008-12-18T00:00:00
[ [ "Unnikrishnan", "Sanil", "" ], [ "Jassal", "H. K.", "" ], [ "Seshadri", "T. R.", "" ] ]
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801.2018
S Dev Sharma
S. Dev and Sanjeev Kumar
Two-Zero Symmetric Neutrino Mass Matrices in Minimal Supersymmetric SO(10)
12 pages, two tables
null
null
null
hep-ph
null
The phenomenological neutrino mass matrix for two-zero symmetric texture has been obtained and used to rule out all possible two-zero symmetric neutrino mass matrices obtained from Yukawa couplings to $\mathbf{10}$ and $\mathbf{126}$ Higgs representations within the framework of minimal supersymmetric SO(10).
[ { "version": "v1", "created": "Mon, 14 Jan 2008 07:26:12 GMT" } ]
2008-01-15T00:00:00
[ [ "Dev", "S.", "" ], [ "Kumar", "Sanjeev", "" ] ]
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801.2019
Yveline Lebreton
Pierre Morel, Yveline Lebreton
CESAM: a free code for stellar evolution calculations
13 pages, 1 figure, accepted for publication in Astrophysics & Space Science, ESTA/CoRoT Volume
Astrophys.Space Sci.316:61-73,2008
10.1007/s10509-007-9663-9
null
astro-ph
null
The Cesam code is a consistent set of programs and routines which perform calculations of 1D quasi-hydrostatic stellar evolution including microscopic diffusion of chemical species and diffusion of angular momentum. The solution of the quasi-static equilibrium is performed by a collocation method based on piecewise polynomials approximations projected on a B-spline basis; that allows stable and robust calculations, and the exact restitution of the solution, not only at grid points, even for the discontinuous variables. Other advantages are the monitoring by only one parameter of the accuracy and its improvement by super-convergence. An automatic mesh refinement has been designed for adjusting the localisations of grid points according to the changes of unknowns. For standard models, the evolution of the chemical composition is solved by stiffly stable schemes of orders up to four; in the convection zones mixing and evolution of chemical are simultaneous. The solution of the diffusion equation employs the Galerkin finite elements scheme; the mixing of chemicals is then performed by a strong turbulent diffusion. A precise restoration of the atmosphere is allowed for.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 07:21:02 GMT" } ]
2009-06-23T00:00:00
[ [ "Morel", "Pierre", "" ], [ "Lebreton", "Yveline", "" ] ]
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801.202
Kiyoshi Shiraishi
Nahomi Kan (Yamaguchi Junior College) and Kiyoshi Shiraishi (Yamaguchi University)
Induced Gravity in Deconstructed Space at Finite Temperature -- Self-consistent Einstein Universe
4 pages, 2 figures. A presentation given at JGRG17 (Nagoya, Japan), to appear in the proceedings
null
null
null
gr-qc hep-th math-ph math.MP
null
We study self-consistent cosmological solutions for an Einstein Universe in a graph-based induced gravity model. The graph-based field theory has been proposed by the present authors to generalize dimensional deconstruction. In this paper, we consider self-consistent Einstein equations for a ``graph theory space''. Especially, we demonstrate specific results for cycle graphs.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 07:25:00 GMT" } ]
2008-01-15T00:00:00
[ [ "Kan", "Nahomi", "", "Yamaguchi Junior College" ], [ "Shiraishi", "Kiyoshi", "", "Yamaguchi\n University" ] ]
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801.2021
Alexey Glibichuk Anatolyevich
Alexey Glibichuk
Additive properties of product sets in an arbitrary finite field
11 pages
null
null
null
math.NT math.CO
null
It is proved that for any two subsets $A$ and $B$ of an arbitrary finite field $\Fq$ such that $|A||B|>q$ the identity $16AB=\Fq$ holds. Moreover, it is established that for every subsets $X, Y\subset \Fq$ with the property $|X||Y|\geqslant 2q$ the equality $8XY=\Fq$ holds.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 07:26:01 GMT" } ]
2008-01-15T00:00:00
[ [ "Glibichuk", "Alexey", "" ] ]
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801.2022
Yveline Lebreton
Y. Lebreton
Stars in the age of micro-arc-second astrometry
7 pages; to appear in the proceedings of "IAU Symposium 248 - A Giant Step: from Milli- to Micro-arcsecond Astrometry", held in Shanghai, China, 15-19 Oct. 2007
null
10.1017/S1743921308019728
null
astro-ph
null
The understanding and modeling of the structure and evolution of stars is based on statistical physics as well as on hydrodynamics. Today, a precise identification and proper description of the physical processes at work in stellar interiors are still lacking (one key point being that of transport processes) while the comparison of real stars to model predictions, which implies conversions from the theoretical space to the observational one, suffers from uncertainties in model atmospheres. That results in uncertainties on the prediction of stellar properties needed for galactic studies or cosmology (as stellar ages and masses). In the next decade, progress is expected from the theoretical, experimental and observational sides. I illustrate some of the problems we are faced with when modeling stars and the possible tracks towards their solutions. I discuss how future observational ground-based or spatial programs (in particular those dedicated to micro-arc-second astrometry, asteroseismology and interferometry) will provide precise determinations of the stellar parameters and contribute to a better knowledge of stellar interiors and atmospheres in a wide range of stellar masses, chemical compositions and evolution stages.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 07:34:32 GMT" } ]
2018-10-31T00:00:00
[ [ "Lebreton", "Y.", "" ] ]
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801.2023
Balasubramanian Ananthanarayan
B. Ananthanarayan, S. Ramanan
Constraining the low energy pion electromagnetic form factor with space-like data
11 pages in EPJ journal style, to appear in European Physical Journal C
Eur.Phys.J.C54:461-470,2008
10.1140/epjc/s10052-008-0533-6
null
hep-ph
null
The pionic contribution to the g-2 of the muon involves a certain integral over the the modulus squared of F_\pi(t), the pion electromagnetic form factor. We extend techniques that use cut-plane analyticity properties of F_\pi(t) in order to account for present day estimates of the pionic contribution and experimental information at a finite number of points in the space-like region. Using data from several experiments over a large kinematic range for |t|, we find bounds on the expansion coefficients of F_\pi(t), sub-leading to the charge radius. The value of one of these coefficients in chiral perturbation theory respects these bounds. Furthermore, we present a sensitivity analysis to the inputs. A brief comparison with results in the literature that use observables other than the g-2 and timelike data is presented.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 07:45:56 GMT" } ]
2008-11-26T00:00:00
[ [ "Ananthanarayan", "B.", "" ], [ "Ramanan", "S.", "" ] ]
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801.2024
Sisir Roy
Sisir Roy and Malabika Roy
Dark Matter and Supersolidity
5 pages
null
null
null
physics.gen-ph
null
The origin of collisionless cold dark matter has been traced back to its origin to the supersolid model of quantum vacuum.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 08:00:59 GMT" } ]
2008-01-15T00:00:00
[ [ "Roy", "Sisir", "" ], [ "Roy", "Malabika", "" ] ]
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801.2025
Andrew King
A. R. King
Accretion Rates and Beaming in Ultraluminous X-ray Sources
MNRAS Letters, in press
null
10.1111/j.1745-3933.2008.00444.x
null
astro-ph
null
I show that extreme beaming factors $b$ are not needed to explain ULXs as stellar--mass binaries. For neutron star accretors one typically requires $b \sim 0.13$, and for black holes almost no beaming ($b \sim 0.8$). The main reason for the high apparent luminosity is the logarithmic increase in the limiting luminosity for super--Eddington accretion. The required accretion rates are explicable in terms of thermal--timescale mass transfer from donor stars of mass $6 - 10\msun$, or possibly transient outbursts. Beaming factors $\la 0.1$ would be needed to explain luminosities significantly above $10^{40}L_{40}$ erg s$^{-1}$, but these requirements are relaxed somewhat if the accreting matter has low hydrogen content.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 08:40:26 GMT" } ]
2009-11-13T00:00:00
[ [ "King", "A. R.", "" ] ]
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801.2026
Inge S. Helland
Inge S. Helland
Quantum Mechanics from Focusing and Symmetry
This article is outdated
Found.Phys.38:818-842,2008
10.1007/s10701-008-9239-8
null
quant-ph
null
A foundation of quantum mechanics based on the concepts of focusing and symmetry is proposed. Focusing is connected to c-variables - inaccessible conceptually derived variables; several examples of such variables are given. The focus is then on a maximal accessible parameter, a function of the common c-variable. Symmetry is introduced via a group acting on the c-variable. From this, the Hilbert space is constructed and state vectors and operators are given a clear interpretation. The Born formula is proved from weak assumptions, and from this the usual rules of quantum mechanics are derived. Several paradoxes and other issues of quantum theory are discussed.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 08:44:06 GMT" }, { "version": "v2", "created": "Fri, 27 Oct 2023 06:27:34 GMT" } ]
2023-10-30T00:00:00
[ [ "Helland", "Inge S.", "" ] ]
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801.2027
Yu-Min Zhao
J. J. Shen, A. Arima, Y. M. Zhao, N. Yoshinaga
Strong Linear Correlation Between Eigenvalues and Diagonal Matrix Elements
4 pages
Phys.Rev.C78:044305,2008
10.1103/PhysRevC.78.044305
null
nucl-th
null
We investigate eigenvalues of many-body systems interacting by two-body forces as well as those of random matrices. We find a strong linear correlation between eigenvalues and diagonal matrix elements if both of them are sorted from the smaller values to larger ones. By using this linear correlation we are able to predict reasonably all eigenvalues of given shell model Hamiltonian without complicated iterations.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 08:49:16 GMT" } ]
2008-11-26T00:00:00
[ [ "Shen", "J. J.", "" ], [ "Arima", "A.", "" ], [ "Zhao", "Y. M.", "" ], [ "Yoshinaga", "N.", "" ] ]
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801.2028
Alexander E. Dorokhov
A. E. Dorokhov, E. A. Kuraev, Yu. M. Bystritskiy and M. Secansk\'y
QED radiative corrections to the decay pi^0 to e^+e^-
12 pages, 3 figures
Eur.Phys.J.C55:193-198,2008
10.1140/epjc/s10052-008-0590-x
null
hep-ph
null
We reconsider QED radiative corrections (RC) to the $\pi^{0}\to e^{+}e^{-}$ decay width. One kind of RC investigated earlier has a renormalization group origin and can be associated with the final state interaction of electron and positron. It determines the distribution of lepton pair invariant masses in the whole kinematic region. The other type of RC has a double-logarithmic character and is related to almost on-mass-shell behavior of the lepton form factors. The total effect of RC for the $\pi^{0}\to e^{+}e^{-}$ decay is estimated to be 3.2% and for the decay $\eta \to e^{+}e^{-}$ is 4.3%.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 09:14:48 GMT" } ]
2008-11-26T00:00:00
[ [ "Dorokhov", "A. E.", "" ], [ "Kuraev", "E. A.", "" ], [ "Bystritskiy", "Yu. M.", "" ], [ "Secanský", "M.", "" ] ]
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801.2029
Asli Sabanci
A. Sabanci, A. Hayreter, L. Solmaz
Higgs Boson Masses Of The MSSM With General Soft Breaking
9 pages, 2 figures; added new references
Phys.Lett.B661:154-157,2008
10.1016/j.physletb.2008.01.071
661/2-3 pp. 154-157
hep-ph
null
The operators that break supersymmetry can be holomorphic or non-holomorphic in structure. The latter do not pose any problem for gauge hierarchy and are soft provided that the particle spectrum does not contain any gauge singlets. In minimal supersymmetric model (MSSM) we discuss the impact of non-holomorphic soft-breaking terms on the Higgs sector. We find that non-holomorphic operators can cause significant changes as are best exhibited by the correlation between the masses of the charginos and Higgs bosons.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 09:29:32 GMT" }, { "version": "v2", "created": "Fri, 25 Jan 2008 12:17:22 GMT" } ]
2008-11-26T00:00:00
[ [ "Sabanci", "A.", "" ], [ "Hayreter", "A.", "" ], [ "Solmaz", "L.", "" ] ]
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801.203
Olivier Merlo
L. Benet, O. Merlo
Phase-Space Volume of Regions of Trapped Motion: Multiple Ring Components and Arcs
19 pages, 17 figures
Luis Benet and Olivier Merlo, Cel. Mech. Dyn. Astron. 103 (2009), 209-225
10.1007/s10569-008-9182-1
null
nlin.CD
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The phase--space volume of regions of regular or trapped motion, for bounded or scattering systems with two degrees of freedom respectively, displays universal properties. In particular, sudden reductions in the phase-space volume or gaps are observed at specific values of the parameter which tunes the dynamics; these locations are approximated by the stability resonances. The latter are defined by a resonant condition on the stability exponents of a central linearly stable periodic orbit. We show that, for more than two degrees of freedom, these resonances can be excited opening up gaps, which effectively separate and reduce the regions of trapped motion in phase space. Using the scattering approach to narrow rings and a billiard system as example, we demonstrate that this mechanism yields rings with two or more components. Arcs are also obtained, specifically when an additional (mean-motion) resonance condition is met. We obtain a complete representation of the phase-space volume occupied by the regions of trapped motion.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 09:36:19 GMT" }, { "version": "v2", "created": "Thu, 30 Oct 2008 19:32:28 GMT" } ]
2010-10-28T00:00:00
[ [ "Benet", "L.", "" ], [ "Merlo", "O.", "" ] ]
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801.2031
Yu-Min Zhao
J. J. Shen, Y. M. Zhao, A. Arima, N. Yoshinaga
Lowest Eigenvalues of Random Hamiltonians
null
Phys.Rev.C77:054312,2008
10.1103/PhysRevC.77.054312
null
nucl-th
null
In this paper we present results of the lowest eigenvalues of random Hamiltonians for both fermion and boson systems. We show that an empirical formula of evaluating the lowest eigenvalues of random Hamiltonians in terms of energy centroids and widths of eigenvalues are applicable to many different systems (except for $d$ boson systems). We improve the accuracy of the formula by adding moments higher than two. We suggest another new formula to evaluate the lowest eigenvalues for random matrices with large dimensions (20-5000). These empirical formulas are shown to be applicable not only to the evaluation of the lowest energy but also to the evaluation of excited energies of systems under random two-body interactions.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 09:40:43 GMT" } ]
2008-11-26T00:00:00
[ [ "Shen", "J. J.", "" ], [ "Zhao", "Y. M.", "" ], [ "Arima", "A.", "" ], [ "Yoshinaga", "N.", "" ] ]
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801.2032
Ali Massih R.
Karl Forsberg and Ali R. Massih
Diffusion of particles in an expanding sphere with an absorbing boundary
12 pages. To appear in J. Phys. A: Math. Theor. 41 (2008)
null
10.1088/1751-8113/41/6/065001
null
cond-mat.stat-mech
null
We study the problem of particles undergoing Brownian motion in an expanding sphere whose surface is an absorbing boundary for the particles. The problem is akin to that of the diffusion of impurities in a grain of polycrystalline material undergoing grain growth. We solve the time dependent diffusion equation for particles in a d-dimensional expanding sphere to obtain the particle density function (function of space and time). The survival rate or the total number of particles per unit volume as a function of time is evaluated. We have obtained particular solutions exactly for the case where d=3 and a parabolic growth of the sphere. Asymptotic solutions for the particle density when the sphere growth rate is small relative to particle diffusivity and vice versa are derived.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 09:42:49 GMT" } ]
2009-11-13T00:00:00
[ [ "Forsberg", "Karl", "" ], [ "Massih", "Ali R.", "" ] ]
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801.2033
Tom Michoel
Anagha Joshi, Yves Van de Peer, Tom Michoel
Analysis of a Gibbs sampler method for model based clustering of gene expression data
8 pages, 7 figures
Bioinformatics 2008 24(2):176-183
10.1093/bioinformatics/btm562
null
q-bio.QM
null
Over the last decade, a large variety of clustering algorithms have been developed to detect coregulatory relationships among genes from microarray gene expression data. Model based clustering approaches have emerged as statistically well grounded methods, but the properties of these algorithms when applied to large-scale data sets are not always well understood. An in-depth analysis can reveal important insights about the performance of the algorithm, the expected quality of the output clusters, and the possibilities for extracting more relevant information out of a particular data set. We have extended an existing algorithm for model based clustering of genes to simultaneously cluster genes and conditions, and used three large compendia of gene expression data for S. cerevisiae to analyze its properties. The algorithm uses a Bayesian approach and a Gibbs sampling procedure to iteratively update the cluster assignment of each gene and condition. For large-scale data sets, the posterior distribution is strongly peaked on a limited number of equiprobable clusterings. A GO annotation analysis shows that these local maxima are all biologically equally significant, and that simultaneously clustering genes and conditions performs better than only clustering genes and assuming independent conditions. A collection of distinct equivalent clusterings can be summarized as a weighted graph on the set of genes, from which we extract fuzzy, overlapping clusters using a graph spectral method. The cores of these fuzzy clusters contain tight sets of strongly coexpressed genes, while the overlaps exhibit relations between genes showing only partial coexpression.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 09:49:57 GMT" } ]
2008-01-15T00:00:00
[ [ "Joshi", "Anagha", "" ], [ "Van de Peer", "Yves", "" ], [ "Michoel", "Tom", "" ] ]
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801.2034
Jochen Sommerfeld
Jochen Sommerfeld, Igor Bjelakovic and Holger Boche
On the Boundedness of the Support of Optimal Input Measures for Rayleigh Fading Channels
5 pages, submitted to ISIT 2008
null
null
null
cs.IT math.IT
null
We consider transmission over a wireless multiple antenna communication system operating in a Rayleigh flat fading environment with no channel state information at the receiver and the transmitter with coherence time T=1. We show that, subject to the average power constraint, the support of the capacity achieving input distribution is bounded. Moreover, we show by a simple example concerning the identity theorem (or uniqueness theorem) from the complex analysis in several variables that some of the existing results in the field are not rigorous.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 09:58:26 GMT" } ]
2008-01-15T00:00:00
[ [ "Sommerfeld", "Jochen", "" ], [ "Bjelakovic", "Igor", "" ], [ "Boche", "Holger", "" ] ]
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801.2035
Larisa Tatarinova
Larisa L. Tatarinova and Martin E. Garcia
Exact description of self-focusing in highly nonlinear geometrical optics
3 figures
null
null
null
physics.optics
null
We demonstrate that laser beam collapse in highly nonlinear media can be described, for a large number of experimental conditions, by the geometrical optics approximation within high accuracy. Taking into account this fact we succeed in constructing analytical solutions of the eikonal equation, which are exact on the beam axis and provide: i) a first-principles determination of the self-focusing position, thus replacing the widely used empirical Marburger formula, ii) a benchmark solution for numerical simulations, and iii) a tool for the experimental determination of the high-order nonlinear susceptibility. Successful comparison with several experiments is presented.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 10:11:40 GMT" } ]
2008-01-15T00:00:00
[ [ "Tatarinova", "Larisa L.", "" ], [ "Garcia", "Martin E.", "" ] ]
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801.2036
Alexei Nefediev
Yu.S.Kalashnikova, A.V.Nefediev (ITEP, Moscow)
Spectra and decays of hybrid charmonia
RevTeX4, 19 pages, introduction extended, version to appear in Phys.Rev.D
Phys.Rev.D77:054025,2008
10.1103/PhysRevD.77.054025
null
hep-ph
null
QCD string model is employed to calculate the masses and spin splittings of lowest charmonium hybrid states with a magnetic gluon. Relative decay rates into various S- and P-wave D-meson pairs are calculated for these hybrids.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 10:36:46 GMT" }, { "version": "v2", "created": "Thu, 28 Feb 2008 12:54:51 GMT" } ]
2008-11-26T00:00:00
[ [ "Kalashnikova", "Yu. S.", "", "ITEP, Moscow" ], [ "Nefediev", "A. V.", "", "ITEP, Moscow" ] ]
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801.2037
Ian Heywood
Ian Heywood, Hans-Rainer Kloeckner, Steve Rawlings
Equatorial Imaging with e-MERLIN Including the Chilbolton Antenna
4 pages, 5 figures, to appear in the proceedings of 'Cosmology, Galaxy Formation and Astroparticle Physics on the Pathway to the SKA' (H.R. Kloeckner, S. Rawlings, M.J. Jarvis & A. Taylor, eds.) 10-12 April 2006, Oxford, UK
null
null
null
astro-ph
null
We discuss the equatorial imaging benefits that arise from the addition of the 25-metre dish at Chilbolton to the e-MERLIN array. Its inclusion considerably enhances the capabilities of e-MERLIN on and below the equator. This will become particularly important in the era of ALMA and other upcoming southern hemisphere facilities. We present simulated observations of point sources in the equatorial region of the sky which is the target area for many existing sky surveys. We find that the additional baselines created by the inclusion of the Chilbolton dish favourably adjust the beam shape of e-MERLIN to a more compact and circular shape, with significantly reduced sidelobe structure. Putting aside the benefits of increased collecting area, the modified beam shape has implications for more rapidly reaching a given completeness limit for equatorial surveys.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 10:38:59 GMT" } ]
2008-01-15T00:00:00
[ [ "Heywood", "Ian", "" ], [ "Kloeckner", "Hans-Rainer", "" ], [ "Rawlings", "Steve", "" ] ]
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801.2038
Giuseppe Longo
Francis Bailly, Giuseppe Longo
Biological Organization and Negative Entropy: Based on Schroedinger's reflections
28 pages
null
null
null
q-bio.OT
null
This paper proposes a systemic perspective for some aspects of both phylogenesis and ontogenesis, in the light of the notion of biological organization as negative entropy, following some hints by Schroedinger. To this purpose, we introduce two extra principles to the thermodynamic ones, which are (mathematically) compatible with the traditional principles, but have no meaning in inert matter. A traditional balance equation for metabolism will be then extended to the new notion as specified by these principles. We consider far from equilibrium systems and we focus in particular on the production of global entropy associated to the irreversible character of the processes. A close analysis of this term will be carried on, both in terms of a diffusion equation of biomass over complexity and, as a complementary approach and as a tool for specifying a source term, in connection to Schroedinger's method for his equation in Quantum Mechanics. We borrow from this equation just the operatorial approach and, this, in a classical frame, as we use real coefficients instead of complex ones, away thus from the mathematical frame of quantum theories. The first application of our proposal is a simple mathematical reconstruction of Gould's complexity curve of biomass over complexity, as for evolution. We then elaborate, from the existence of different time scales, a partition of ontogenetic time, in reference to entropy and negative entropy variation. On the grounds of this approach, we analyze metabolism and scaling laws. This allows to compare various relevant coefficients appearing in these scaling laws, which seem to fit empirical data. Finally, a tentative and quantitative evaluation of complexity is proposed, also in relation to some empirical data (caenorhabditis elegans).
[ { "version": "v1", "created": "Mon, 14 Jan 2008 10:39:10 GMT" } ]
2008-01-15T00:00:00
[ [ "Bailly", "Francis", "" ], [ "Longo", "Giuseppe", "" ] ]
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801.2039
Isabella Pagano
I. Pagano, M. Sachkov, A.I. Gomez de Castro, M. Huang, N. Kappelmann, S. Scuderi, B. Shustov, K. Werner, and G. Zhao
The focal-plane instruments on board WSO-UV
in Astrophysics and Space Science Proceedings series, M. Chavez, E. Bertone, D. Rosa-Gonzalez & L. H. Rodriguez-Merino (eds.), invited paper, in press
null
10.1007/978-0-387-87621-4_41
null
astro-ph
null
Dedicated to spectroscopic and imaging observations of the ultraviolet sky, the World Space Observatory for Ultraviolet Project is a Russia led international collaboration presently involving also China, Germany, Italy, Spain and Ukraine. The mission consists of a 1.7m telescope able to perform: a) high resolution (R greater than 60000) spectroscopy by means of two echelle spectrographs covering the 103-310 nm range; b) long slit (1x75 arcsec) low resolution (R about 1500-2500) spectroscopy using a near-UV channel and a far-UV channel to cover the 102-310nm range; c) deep UV and diffraction limited UV and optical imaging (from 115 to 700 nm). Overall information on the project and on its science objectives are given by other two papers in these proceedings. Here we present the WSO-UV focal plane instruments, their status of implementation, and the expected performances.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 15:03:03 GMT" } ]
2020-08-05T00:00:00
[ [ "Pagano", "I.", "" ], [ "Sachkov", "M.", "" ], [ "de Castro", "A. I. Gomez", "" ], [ "Huang", "M.", "" ], [ "Kappelmann", "N.", "" ], [ "Scuderi", "S.", "" ], [ "Shustov", "B.", "" ], [ "Werner", "K.", "" ], [ "Zhao", "G.", "" ] ]
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801.204
Harikumar E
K. M. Ajith, E. Harikumar, Victor O. Rivelles, M. Sivakumar
Aspects of Noncommutative Scalar/Tensor Duality
7 pages, typos corrected, a footnote removed and a sentence added in the text
Phys.Rev.D77:085010,2008
10.1103/PhysRevD.77.085010
null
hep-th
null
We study the noncommutative massless Kalb-Ramond gauge field coupled to a dynamical U(1) gauge field in the adjoint representation together with a compensating vector field. We derive the Seiberg-Witten map and obtain the corresponding mapped action to first order in $\theta$. The (emergent) gravity structure found in other situations is not present here. The off-shell dual scalar theory is derived and it does not coincide with the Seiberg-Witten mapped scalar theory. Dispersion relations are also discussed. The p-form generalization of the Seiberg-Witten map to order $\theta $ is also derived.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 10:55:48 GMT" }, { "version": "v2", "created": "Mon, 21 Jan 2008 05:58:23 GMT" }, { "version": "v3", "created": "Wed, 5 Mar 2008 04:21:29 GMT" } ]
2008-11-26T00:00:00
[ [ "Ajith", "K. M.", "" ], [ "Harikumar", "E.", "" ], [ "Rivelles", "Victor O.", "" ], [ "Sivakumar", "M.", "" ] ]
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801.2041
Pankaj Jain
Pankaj Jain, Subhadip Mitra and Naveen K. Singh
Cosmological Implications of a Scale Invariant Standard Model
12 pages, no figures
JCAP 0803:011,2008
10.1088/1475-7516/2008/03/011
null
astro-ph gr-qc hep-ph hep-th
null
We generalize the standard model of particle physics such it displays global scale invariance. The gravitational action is also suitably modified such that it respects this symmetry. This model is interesting since the cosmological constant term is absent in the action. We find that the scale symmetry is broken by the recently introduced cosmological symmetry breaking mechanism. This simultaneously generates all the dimensionful parameters such as the Newton's gravitational constant, the particle masses and the vacuum or dark energy. We find that in its simplest version the model predicts the Higgs mass to be very small, which is ruled out experimentally. We further generalize the model such that it displays local scale invariance. In this case the Higgs particle disappears from the particle spectrum and instead we find a very massive vector boson. Hence the model gives a consistent description of particle physics phenomenology as well as fits the cosmological dark energy.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 10:47:52 GMT" } ]
2009-06-23T00:00:00
[ [ "Jain", "Pankaj", "" ], [ "Mitra", "Subhadip", "" ], [ "Singh", "Naveen K.", "" ] ]
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801.2042
Dong Ruan
Dexin Lu (NJU), Dong Ruan (THU), Wang Xu (NJU), Nianle Wu (THU), Minwen Xiao (NJU), Yu an (THU)
An Experiment of Research-Oriented Teaching/Learning
31 pages, 4 figures
null
null
null
physics.ed-ph
null
We introduce our experiment of research-oriented teaching mainly in Nanjing University and Tsinghua University, China. The great population and enrollment in China makes it worth to concern. It lasts 20 years and involves thousands of students and hundreds of instructors, consultant experts. We tried many characteristic styles such as integrated teaching and case analysis, open resources, interactive mode, course paper program, elite solutions and so on. The research on the contents is also placed on the agenda. Many students joined research works that lead to PRL, APL, Nature, Science, and Cell papers. To impart colleagues the essence we offered some examples in every session. We declare the accomplishment of the experiment through this paper and new project is programming.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 10:49:28 GMT" } ]
2008-01-15T00:00:00
[ [ "Lu", "Dexin", "", "NJU" ], [ "Ruan", "Dong", "", "THU" ], [ "Xu", "Wang", "", "NJU" ], [ "Wu", "Nianle", "", "THU" ], [ "Xiao", "Minwen", "", "NJU" ], [ "an", "Yu", "", "THU" ] ]
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801.2043
Joakim Nystrand
Joakim Nystrand
Photoproduction in Ultra-Peripheral Heavy-Ion Collisions
6 pages, 1 figure. Presented at the International Conference on the Structure and Interactions of the Photon (Photon 2007), Paris, France, 9-13 July 2007. To be published in Nucl. Phys. B. v2 one reference corrected
Nucl.Phys.Proc.Suppl.184:146-151,2008
10.1016/j.nuclphysbps.2008.09.153
2007.12
hep-ph
null
The strong electromagnetic fields present in ultra-peripheral collisions of heavy-ions offer a possibility to study two-photon and photonuclear collisions complementary to similar studies with lepton beams but over an increased photon energy range. This presentation will give an overview of photoproduction at hadron colliders.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 10:54:31 GMT" }, { "version": "v2", "created": "Wed, 13 Feb 2008 10:12:11 GMT" } ]
2008-12-18T00:00:00
[ [ "Nystrand", "Joakim", "" ] ]
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801.2044
Masakatsu Kenmoku
M. Kenmoku, M. Kuwata and K. Shigemoto
Normal Modes and No Zero Mode Theorem of Scalar Fields in BTZ Black Hole Spacetime
11 pages,v2 typos corrected
Class.Quant.Grav.25:145016,2008
10.1088/0264-9381/25/14/145016
null
gr-qc
null
Eigenfunctions for normal modes of scalar fields in BTZ black hole spacetime are studied. Orthonormal relations among them are derived. Quantization for scalar fields is done and particle number, energy and angular momentum are expressed by the creation and annihilation operators. Allowed physical normal mode region is studied on the basis of the no zero mode theorem. Its implication to the statistical mechanics is also studied.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 11:21:35 GMT" }, { "version": "v2", "created": "Sun, 17 Feb 2008 06:00:53 GMT" } ]
2008-11-26T00:00:00
[ [ "Kenmoku", "M.", "" ], [ "Kuwata", "M.", "" ], [ "Shigemoto", "K.", "" ] ]
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801.2045
Kirrily Rule
K.C. Rule, M.J. Lewis, H.A. Dabkowska, D.R. Taylor and B.D. Gaulin
Critical X-ray Scattering Studies of Jahn-Teller Phase Transitions in TbV$_{1-x}$As$_{x}$O$_{4}$
8 pages, 6 figures
null
10.1103/PhysRevB.77.134116
null
cond-mat.str-el
null
The critical behaviour associated with cooperative Jahn-Teller phase transitions in TbV$_{1-x}$As$_{x}$O$_{4}$ (where \textit{x} = 0, 0.17, 1) single crystals have been studied using high resolution x-ray scattering. These materials undergo continuous tetragonal $\to$ orthorhombic structural phase transitions driven by Jahn-Teller physics at T$_C$ = 33.26(2) K, 30.32(2) K and 27.30(2) K for \textit{x} = 0, 0.17 and 1 respectively. The orthorhombic strain was measured close to the phase transition and is shown to display mean field behavior in all three samples. Pronounced fluctuation effects are manifest in the longitudinal width of the Bragg scattering, which diverges as a power law, with an exponent given by $x=0.45 \pm 0.04$, on approaching the transition from either above or below. All samples exhibited twinning; however the disordered x = 0.17 sample showed a broad distribution of twins which were stable to relatively low temperatures, well below T$_C$. This indicates that while the orthorhombic strain continues to develop in a conventional mean field manner in the presence of disorder, twin domains are easily pinned by the quenched impurities and their associated random strains.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 11:02:58 GMT" } ]
2009-11-13T00:00:00
[ [ "Rule", "K. C.", "" ], [ "Lewis", "M. J.", "" ], [ "Dabkowska", "H. A.", "" ], [ "Taylor", "D. R.", "" ], [ "Gaulin", "B. D.", "" ] ]
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801.2046
Deepak Mathur
Deepak Mathur, Aditya K. Dharmadhikari, Firoz A. Rajgara, and Jayashree A. Dharmadhikari
Molecular symmetry effects in the ionization of CS$_2$ by intense, few-cycle laser pulses
Submitted to Physical Review Lottery
null
10.1103/PhysRevA.78.013405
null
physics.optics physics.atom-ph
null
Few-cycle pulses of intense 800 nm light are used to probe ionization and dissociation of carbon disulfide in the intensity and temporal regime where rescattering is expected to dominate the laser-molecule interaction. The wavepacket of the rescattered electron destructively interferes with the anti-bonding $\pi$-orbital of CS$_2^+$ such that rescattering is effectively "switched off". Direct signature of enhanced ionization being "switched off" in the ultrashort domain is also obtained. Consequently, dissociation becomes an almost non-existent channel when few-cycle pulses are used, with only long-lived singly-, doubly-, and triply-charged molecular ions dominating the mass spectrum. Few-cycle optical pulses help reveal that quantum-mechanically determined molecular symmetry contributes to strong field molecular ionization.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 11:03:59 GMT" } ]
2009-11-13T00:00:00
[ [ "Mathur", "Deepak", "" ], [ "Dharmadhikari", "Aditya K.", "" ], [ "Rajgara", "Firoz A.", "" ], [ "Dharmadhikari", "Jayashree A.", "" ] ]
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801.2047
Jerome Boudet
J\'er\^ome Boudet (LMFA), Jo\"elle Caro (LMFA), L. Shao (LMFA), Emmanuel L\'ev\^eque (Phys-ENS)
Numerical studies towards practical large-eddy simulation
null
Journal of Thermal Science 16, 4 (2007) 328-336
10.1007/s11630-007-0328-3
null
physics.flu-dyn
null
Large-eddy simulation developments and validations are presented for an improved simulation of turbulent internal flows. Numerical methods are proposed according to two competing criteria: numerical qualities (precision and spectral characteristics), and adaptability to complex configurations. First, methods are tested on academic test-cases, in order to abridge with fundamental studies. Consistent results are obtained using adaptable finite volume method, with higher order advection fluxes, implicit grid filtering and "low-cost" shear-improved Smagorinsky model. This analysis particularly focuses on mean flow, fluctuations, two-point correlations and spectra. Moreover, it is shown that exponential averaging is a promising tool for LES implementation in complex geometry with deterministic unsteadiness. Finally, adaptability of the method is demonstrated by application to a configuration representative of blade-tip clearance flow in a turbomachine.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 11:04:10 GMT" } ]
2008-01-15T00:00:00
[ [ "Boudet", "Jérôme", "", "LMFA" ], [ "Caro", "Joëlle", "", "LMFA" ], [ "Shao", "L.", "", "LMFA" ], [ "Lévêque", "Emmanuel", "", "Phys-ENS" ] ]
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801.2048
Petros Draggiotis
Petros Draggiotis
Numerical Implementation of Generalized Unitarity
10 pages, 1 figure
null
null
null
hep-ph
null
We present a numerical implementation of generalized unitarity. We will show that we are able to obtain the box coefficients of any 1 loop gluonic amplitude, for an arbitrary helicity configuration and for any number of external particles.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 15:14:19 GMT" } ]
2008-01-15T00:00:00
[ [ "Draggiotis", "Petros", "" ] ]
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801.2049
Andrzej Trzesowski
Andrzej Trzesowski
Nanothermomechanics
29 pages. Keywords: affinely-rigid body, constraints, graphenes, fullerenes, insensibility group, liquid-like response, nanocluster, nanothermodynamics, nanothermomechanics, quasi-solid state, solid state, structural stability, size effect, shape effect, viscosity effect
Journal of Technical Physics, vol. 50, 3-4, pp. 151-172, 2009.
null
null
cond-mat.mtrl-sci math-ph math.MP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The paper concerns the dependence of thermomechanical properties of three-dimensional solid nanoclusters on the cluster size as well as on its shape. Investigations are restricted to the class of so-called homogeneous thermodynamic processes with kinematics based on affine group and referred to the one whole body, not an infinite system of subbodies. It is shown that then the thermodynamics of nanoclusters is consistent with dynamics of affinely-rigid bodies (constrained or not and elastic as well as admitting viscosity effects). The main discussed top-ics are: (i) a group-theoretical description of structurally stable solid nanoclusters; (ii) a phe-nomenological model of mechanical properties of nanoclusters revealing the coexistence of solid and liquid states in a finite interval of absolute temperature.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 11:23:09 GMT" }, { "version": "v2", "created": "Tue, 22 Jan 2008 12:27:49 GMT" }, { "version": "v3", "created": "Wed, 7 May 2008 10:02:28 GMT" }, { "version": "v4", "created": "Thu, 19 Jun 2008 10:14:18 GMT" }, { "version": "v5", "created": "Fri, 5 Dec 2008 10:54:53 GMT" }, { "version": "v6", "created": "Tue, 16 Mar 2010 11:08:19 GMT" } ]
2010-03-17T00:00:00
[ [ "Trzesowski", "Andrzej", "" ] ]
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801.205
Alessandro Siria
A. Siria, M. S. Rodrigues, O. Dhez, W. Schwartz, G. Torricelli, S. Le Denmat, N. Rochat, G. Auvert, O. Bikondoa, T. H. Metzger, D. Wermeille, R. Felici, F. Comin and J. Chevrier
X-ray pushing of a mechanical microswing
5 pages, 4 figure
null
10.1088/0957-4484/19/44/445501
null
physics.ins-det
null
Nanoelectromechanical Systems (NEMS) are among the best candidates to measure interactions at nanoscale [1-6], especially when resonating oscillators are used with high quality factor [7, 8]. Despite many efforts [9, 10], efficient and easy actuation in NEMS remains an issue [11]. The mechanism that we propose, thermally mediated Center Of Mass (COM) displacements, represents a new actuation scheme for NEMS and MEMS. To demonstrate this scheme efficiency we show how mechanical nanodis- placements of a MEMS is triggered using modulated X-ray microbeams. The MEMS is a microswing constituted by a Ge microcrystal attached to a Si microcantilever. The interaction is mediated by the Ge absorption of the intensity modulated X-ray microbeam impinging on the microcrystal. The small but finite thermal expansion of the Ge microcrystal is large enough to force a nanodisplacement of the Ge microcrystal COM glued on a Si microlever. The inverse mechanism can be envisaged: MEMS can be used to shape X-ray beams. A Si microlever can be a high frequency X-ray beam chopper for time studies in biology and chemistry.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 11:25:26 GMT" }, { "version": "v2", "created": "Tue, 22 Jan 2008 22:16:37 GMT" } ]
2009-11-13T00:00:00
[ [ "Siria", "A.", "" ], [ "Rodrigues", "M. S.", "" ], [ "Dhez", "O.", "" ], [ "Schwartz", "W.", "" ], [ "Torricelli", "G.", "" ], [ "Denmat", "S. Le", "" ], [ "Rochat", "N.", "" ], [ "Auvert", "G.", "" ], [ "Bikondoa", "O.", "" ], [ "Metzger", "T. H.", "" ], [ "Wermeille", "D.", "" ], [ "Felici", "R.", "" ], [ "Comin", "F.", "" ], [ "Chevrier", "J.", "" ] ]
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801.2051
Daniel M. Pellegrino
Geraldo Botelho and Daniel Pellegrino
Absolutely summing linear operators into spaces with no finite cotype
7 pages
Bulletin of the Belgian Mathematical Society Simon Stevin, v. 16, p. 373-378, 2009
null
null
math.FA
null
Given an infinite-dimensional Banach space $X$ and a Banach space $Y$ with no finite cotype, we determine whether or not every continuous linear operator from $X$ to $Y$ is absolutely $(q;p)$-summing for almost all choices of $p$ and $q$, including the case $p=q$. If $X$ assumes its cotype, the problem is solved for all choices of $p$ and $q$. Applications to the theory of dominated multilinear mappings are also provided.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 11:34:45 GMT" } ]
2015-10-06T00:00:00
[ [ "Botelho", "Geraldo", "" ], [ "Pellegrino", "Daniel", "" ] ]
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801.2052
Peter Jorgensen
Peter Jorgensen
Calabi-Yau categories and Poincare duality spaces
33 pages; minor changes. To appear in the ICRA XII volume "Trends in Representation Theory of Algebras and Related Topics"
null
null
null
math.RT math.AT math.RA
null
The singular cochain complex of a topological space is a classical object. It is a Differential Graded algebra which has been studied intensively with a range of methods, not least within rational homotopy theory. More recently, the tools of Auslander-Reiten theory have also been applied to the singular cochain complex. One of the highlights is that by these methods, each Poincare duality space gives rise to a Calabi-Yau category. This paper is a review of the theory.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 11:36:46 GMT" }, { "version": "v2", "created": "Mon, 14 Apr 2008 13:03:07 GMT" } ]
2008-04-14T00:00:00
[ [ "Jorgensen", "Peter", "" ] ]
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801.2053
Chen Songbai
Songbai Chen, Bin Wang, Rukeng Su
Hawking radiation in a $d$-dimensional static spherically-symmetric black Hole surrounded by quintessence
16 pages, Accepted for publication in Phys. Rev. D
Phys.Rev.D77:124011,2008
10.1103/PhysRevD.77.124011
null
gr-qc
null
We present a solution of Einstein equations with quintessential matter surrounding a $d$-dimensional black hole, whose asymptotic structures are determined by the state of the quintessential matter. We examine the thermodynamics of this black hole and find that the mass of the black hole depends on the equation of state of the quintessence, while the first law is universal. Investigating the Hawking radiation in this black hole background, we observe that the Hawking radiation dominates on the brane in the low-energy regime. For different asymptotic structures caused by the equation of state of the quintessential matter surrounding the black hole, we learn that the influences by the state parameter of the quintessence on Hawking radiation are different.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 11:40:22 GMT" }, { "version": "v2", "created": "Sun, 20 Apr 2008 02:21:20 GMT" } ]
2008-11-26T00:00:00
[ [ "Chen", "Songbai", "" ], [ "Wang", "Bin", "" ], [ "Su", "Rukeng", "" ] ]
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801.2054
Pinaki Majumdar
Anamitra Mukherjee, Kalpataru Pradhan and Pinaki Majumdar
Conductance Switching and Inhomogeneous Field Melting in the Charge Ordered Manganites
5 pages, pdflatex, 5 png figures To appear in Europhys. Lett
null
10.1209/0295-5075/86/27003
null
cond-mat.str-el cond-mat.stat-mech
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The field induced switching of conductance in the charge ordered half-doped manganites is controlled by the combination of metastability, an inhomogeneous high field state, and cation disorder. We study this non-equilibrium problem via real space Monte Carlo on a disordered strong coupling model appropriate to the manganites. We reproduce the variation of the switching fields with the mean ionic radius r_A and cation disorder \sigma_A, and demonstrate how the experimental features arise from the proximity of several phases in the Landau free energy landscape. Our prediction for the field melted state is consistent with a growing body of experimental evidence.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 11:44:42 GMT" }, { "version": "v2", "created": "Fri, 20 Mar 2009 11:03:00 GMT" } ]
2015-05-13T00:00:00
[ [ "Mukherjee", "Anamitra", "" ], [ "Pradhan", "Kalpataru", "" ], [ "Majumdar", "Pinaki", "" ] ]
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801.2055
Florin Panaite
Florin Panaite, Mihai D. Staic, Freddy Van Oystaeyen
Pseudosymmetric braidings, twines and twisted algebras
29 pages
null
null
null
math.QA math.CT
null
A laycle is the categorical analogue of a lazy cocycle. Twines (as introduced by Bruguieres) and strong twines (as introduced by the authors) are laycles satisfying some extra conditions. If $c$ is a braiding, the double braiding $c^2$ is always a twine; we prove that it is a strong twine if and only if $c$ satisfies a sort of modified braid relation (we call such $c$ pseudosymmetric, as any symmetric braiding satisfies this relation). It is known that symmetric Yetter-Drinfeld categories are trivial; we prove that the Yetter-Drinfeld category $_H{\cal YD}^H$ over a Hopf algebra $H$ is pseudosymmetric if and only if $H$ is commutative and cocommutative. We introduce as well the Hopf algebraic counterpart of pseudosymmetric braidings under the name pseudotriangular structures and prove that all quasitriangular structures on the $2^{n+1}$-dimensional pointed Hopf algebras E(n) are pseudotriangular. We observe that a laycle on a monoidal category induces a so-called pseudotwistor on every algebra in the category, and we obtain some general results (and give some examples) concerning pseudotwistors, inspired by properties of laycles and twines.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 12:03:28 GMT" } ]
2008-01-15T00:00:00
[ [ "Panaite", "Florin", "" ], [ "Staic", "Mihai D.", "" ], [ "Van Oystaeyen", "Freddy", "" ] ]
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801.2056
Julius Ruseckas
Gediminas Juzeliunas, Julius Ruseckas, Andreas Jacob, Luis Santos, Patrik Ohberg
Double and negative reflection of cold atoms in non-Abelian gauge potentials
5 figures corrected references
Phys. Rev. Lett. 100, 200405 (2008)
10.1103/PhysRevLett.100.200405
null
cond-mat.other physics.atom-ph quant-ph
null
Atom reflection is studied in the presence of a non-Abelian vector potential proportional to a spin-1/2 operator. The potential is produced by a relatively simple laser configuration for atoms with a tripod level scheme. We show that the atomic motion is described by two different dispersion branches with positive or negative chirality. As a consequence of that, atom reflection shows unusual features, since an incident wave may split into two reflected ones at a barrier, an ordinary specular reflection, and an additional non-specular one. Remarkably, the latter wave can exhibit negative reflection and may become evanescent if the angle of incidence exceeds a critical value. These reflection properties are crucial for future designs in non-Abelian atom optics.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 12:06:09 GMT" }, { "version": "v2", "created": "Tue, 27 May 2008 09:12:52 GMT" } ]
2008-05-27T00:00:00
[ [ "Juzeliunas", "Gediminas", "" ], [ "Ruseckas", "Julius", "" ], [ "Jacob", "Andreas", "" ], [ "Santos", "Luis", "" ], [ "Ohberg", "Patrik", "" ] ]
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801.2057
Chenchang Zhu
Chenchang Zhu
n-Groupoids and Stacky Groupoids
45 pages, include other categories than a previous paper-- arXiv:math/0609420 [math.DG], edited version, typos removed, more details on axioms of stacky groupoids. to appear in IMRN
International Mathematics Research Notices (2009) 2009:4087-4141
10.1093/imrn/rnp080
null
math.DG math.CT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We discuss two generalizations of Lie groupoids. One consists of Lie $n$-groupoids defined as simplicial manifolds with trivial $\pi_{k\geq n+1}$. The other consists of stacky Lie groupoids $\cG\rra M$ with $\cG$ a differentiable stack. We build a 1-1 correspondence between Lie 2-groupoids and stacky Lie groupoids up to a certain Morita equivalence. We prove this in a general set-up so that the statement is valid in both differential and topological categories. \Equivalences of higher groupoids in various categories are also described.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 12:12:04 GMT" }, { "version": "v2", "created": "Mon, 29 Jun 2009 10:04:24 GMT" } ]
2009-12-04T00:00:00
[ [ "Zhu", "Chenchang", "" ] ]
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801.2058
Shoulan Gao
Shoulan Gao, Cuipo Jiang and Yufeng Pei
Structure of the extended Schrodinger-Virasoro Lie algebra
24 pages, to appear in Algrbra Colloquium
null
null
null
math.RA math.GM
null
In this paper, we study the derivations, the central extensions and the automorphism group of the extended Schrodinger-Virasoro Lie algebra, introduced by J. Unterberger in the context of two-dimensional conformal field theory and statistical physics. Moreover, we show that the extended Schrodinger-Virasoro Lie algebra is an infinite-dimensional complete Lie algebra and the universal central extension of the extended Schrodinger-Virasoro Lie algebra in the category of Leibniz algebras is the same as that in the category of Lie algebras.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 12:13:48 GMT" } ]
2008-01-15T00:00:00
[ [ "Gao", "Shoulan", "" ], [ "Jiang", "Cuipo", "" ], [ "Pei", "Yufeng", "" ] ]
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801.2059
Michael B\"orsch
N. Zarrabi, T. Heitkamp, J. C. Greie, M. Boersch
Monitoring the conformational dynamics of a single potassium transporter by ALEX-FRET
10 pages, 4 figures
null
10.1117/12.768262
null
physics.bio-ph physics.data-an
null
Conformational changes of single proteins are monitored in real time by Forster-type resonance energy transfer, FRET. Two different fluorophores have to be attached to those protein domains, which move during function. The distance between the fluorophores is measured by relative fluorescence intensity changes of FRET donor and acceptor fluorophore, or by fluorescence lifetime changes of the FRET donor. The fluorescence spectrum of a single FRET donor fluorophore is influenced by local protein environment dynamics causing apparent fluorescence intensity changes on the FRET donor and acceptor detector channels. To discriminate between those spectral fluctuations and distance-dependent FRET, alternating pulsed excitation schemes (ALEX) have recently been introduced which simultaneously probe the existence of a FRET acceptor fluorophore. Here we employ single-molecule FRET measurements to a membrane protein. The membrane-embedded KdpFABC complex transports potassium ions across a lipid bilayer using ATP hydrolysis. Our study aims at the observation of conformational fluctuations within a single P-type ATPase functionally reconstituted into liposomes by single-molecule FRET and analysis by Hidden-Markov-Models.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 12:14:23 GMT" } ]
2009-11-13T00:00:00
[ [ "Zarrabi", "N.", "" ], [ "Heitkamp", "T.", "" ], [ "Greie", "J. C.", "" ], [ "Boersch", "M.", "" ] ]
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801.206
Wei Lin
Qing Ding, Wei Lin
The Transmission Property of the Discrete Heisenberg Ferromagnetic Spin Chain
16 pages, 7 figures
null
10.1063/1.2976036
null
nlin.CD nlin.SI
null
We present a mechanism for displaying the transmission property of the discrete Heisenberg ferromagnetic spin chain (DHF) via a geometric approach. By the aid of a discrete nonlinear Schr\"odinger-like equation which is the discrete gauge equivalent to the DHF, we show that the determination of transmitting coefficients in the transmission problem is always bistable. Thus a definite algorithm and general stochastic algorithms are presented. A new invariant periodic phenomenon of the non-transmitting behavior for the DHF, with a large probability, is revealed by an adoption of various stochastic algorithms.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 12:19:49 GMT" } ]
2009-11-13T00:00:00
[ [ "Ding", "Qing", "" ], [ "Lin", "Wei", "" ] ]
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801.2061
Robert de Mello Koch
Rajsekhar Bhattacharyya, Storm Collins and Robert de Mello Koch
Exact Multi-Matrix Correlators
13+1 pages; v1:minor improvements in presentation and refs added; v2: additional comments in finite N counting; v3: Final JHEP version
JHEP 0803:044,2008
10.1088/1126-6708/2008/03/044
WITS-CTP-036
hep-th
null
We argue that restricted Schur polynomials provide a useful parameterization of the complete set of gauge invariant variables of multi-matrix models. The two point functions of restricted Schur polynomials are evaluated exactly in the free field theory limit. They have diagonal two point functions.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 12:25:01 GMT" }, { "version": "v2", "created": "Thu, 24 Jan 2008 06:49:50 GMT" }, { "version": "v3", "created": "Wed, 5 Mar 2008 18:36:00 GMT" }, { "version": "v4", "created": "Mon, 10 Mar 2008 04:21:31 GMT" } ]
2014-11-18T00:00:00
[ [ "Bhattacharyya", "Rajsekhar", "" ], [ "Collins", "Storm", "" ], [ "Koch", "Robert de Mello", "" ] ]
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801.2062
Michael Bordag
M. Bordag, N. Khusnutdinov
On the vacuum energy of a spherical plasma shell
16 pages, 3 figures, submitted to Phys.Rev.D
Phys.Rev.D77:085026,2008
10.1103/PhysRevD.77.085026
null
hep-th quant-ph
null
We consider the vacuum energy of the electromagnetic field interacting with a spherical plasma shell together with a model for the classical motion of the shell. We calculate the heat kernel coefficients, especially that for the TM mode, and carry out the renormalization by redefining the parameters of the classical model. It turns out that this is possible and results in a model, which in the limit of the plasma shell becoming an ideal conductor reproduces the vacuum energy found by Boyer in 1968.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 12:31:41 GMT" } ]
2008-11-26T00:00:00
[ [ "Bordag", "M.", "" ], [ "Khusnutdinov", "N.", "" ] ]
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801.2063
Andrei Barvinsky
A.O.Barvinsky, C.Deffayet, A.Yu.Kamenshchik
Anomaly Driven Cosmology: Big Boost Scenario and AdS/CFT Correspondence
LaTeX, 14 pages, 1 figure
JCAP 0805:020,2008
10.1088/1475-7516/2008/05/020
null
hep-th
null
We consider the cosmological evolution in a recently suggested new model of quantum initial conditions for the Universe. The effective Friedmann equation incorporates the effect of the conformal anomaly of quantum fields and, interestingly, shows that their vacuum Casimir energy is completely screened and does not gravitate. The cosmological evolution also features a new mechanism for a cosmological acceleration stage. This stage is followed by a big boost singularity -- a rapid growth up to infinity of the scale factor acceleration parameter. We also briefly discuss the relation between our model, the AdS/CFT correspondence and RS and DGP braneworlds.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 12:25:16 GMT" } ]
2009-03-19T00:00:00
[ [ "Barvinsky", "A. O.", "" ], [ "Deffayet", "C.", "" ], [ "Kamenshchik", "A. Yu.", "" ] ]
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801.2064
Joseph A. Minahan
J. A. Minahan, O. Ohlsson Sax
Finite size effects for giant magnons on physical strings
24 pages, 7 figures; v2 typos fixed
Nucl.Phys.B801:97-117,2008
10.1016/j.nuclphysb.2008.04.018
UUITP-20/07
hep-th
null
Using finite gap methods, we find the leading order finite size corrections for an arbitrary number of giant magnons on physical strings, where the sum of the momenta is a multiple of 2\pi. Our results are valid for the Hofman-Maldacena fundamental giant magnons as well as their dyonic generalizations. The energy corrections turn out to be surprisingly simple, especially if all the magnons are fundamental, and at leading order are independent of the magnon flavors. We also show how to use the Bethe ansatz to find finite size corrections for dyonic giant magnons with large R-charges.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 20:20:20 GMT" }, { "version": "v2", "created": "Fri, 1 Feb 2008 03:30:42 GMT" } ]
2008-11-26T00:00:00
[ [ "Minahan", "J. A.", "" ], [ "Sax", "O. Ohlsson", "" ] ]
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801.2065
Christian Schr\"oder
Christian Schr\"oder, Ruslan Prozorov, Paul K\"ogerler, Matthew D. Vannette, Xikui Fang, Marshall Luban, Akira Matsuo, Koichi Kindo, Achim M\"uller, Ana Maria Todea
Multiple nearest-neighbor exchange model for the frustrated magnetic molecules Mo72Fe30 and Mo72Cr30
8 pages, 5 figures
null
10.1103/PhysRevB.77.224409
null
physics.atm-clus
null
Our measurements of the differential susceptibility dM/dH of the frustrated magnetic molecules Mo72Fe30 and Mo72Cr30 reveal a pronounced dependence on magnetic field (H) and temperature (T) in the low H - low T regime, contrary to the predictions of existing models. Excellent agreement with experiment is achieved upon formulating a nearest-neighbor classical Heisenberg model where the 60 nearest-neighbor exchange interactions in each molecule, rather than being identical as has been assumed heretofore, are described by a two-parameter probability distribution of values of the exchange constant. We suggest that the probability distribution provides a convenient phenomenological platform for summarizing the combined effects of multiple microscopic mechanisms that disrupt the idealized picture of a Heisenberg model based on a single value of the nearest-neighbor exchange constant.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 12:44:51 GMT" }, { "version": "v2", "created": "Fri, 9 May 2008 10:34:11 GMT" } ]
2009-11-13T00:00:00
[ [ "Schröder", "Christian", "" ], [ "Prozorov", "Ruslan", "" ], [ "Kögerler", "Paul", "" ], [ "Vannette", "Matthew D.", "" ], [ "Fang", "Xikui", "" ], [ "Luban", "Marshall", "" ], [ "Matsuo", "Akira", "" ], [ "Kindo", "Koichi", "" ], [ "Müller", "Achim", "" ], [ "Todea", "Ana Maria", "" ] ]
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801.2066
Misak Sargsian
Misak M. Sargsian
High Energy Break-Up of Few-Nucleon Systems
To appear in the proceedings of Workshop on Exclusive Reactions at High Momentum Transfer, Newport News, Virgina, 21-24 May 2007
null
10.1142/9789812796950_0027
null
nucl-th
null
We discus recent developments in theory of high energy two-body break-up reactions of few-nucleon systems. The characteristics of these reactions are such that the hard two-body quasielastic subprocess can be clearly separated from the accompanying soft subprocesses. We discuss in details the hard rescattering model (HRM) in which hard photodisintegration develops in two stages. At first, photon knocks-out an energetic quark which rescatters subsequently with a quark of the other nucleon. The latter provides a mechanism of sharing the initial high momentum of the photon by the outgoing two nucleons. Within HRM we discuss hard break-up reactions involving $^2D$ and $^3He$ targets. Another development of HRM is the prediction of new helicity selection mechanism for hard two-body reactions, which was apparently confirmed in the recent JLab experiment.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 12:44:54 GMT" } ]
2017-08-23T00:00:00
[ [ "Sargsian", "Misak M.", "" ] ]
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801.2067
Mahdou Najib
D. Bennis and N. Mahdou
On n-Perfect Rings and Cotorsion Dimension
null
null
null
null
math.AC math.RA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A ring is called $n$-perfect ($n\geq 0$), if every flat module has projective dimension less or equal than $n$. In this paper, we show that the $n$-perfectness relate, via homological approach, some homological dimension of rings. We study $n$-perfectness in some known ring constructions. Finally, several examples of $n$-perfect rings satisfying special conditions are given.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 13:02:13 GMT" }, { "version": "v2", "created": "Wed, 10 Sep 2008 23:54:18 GMT" } ]
2008-09-11T00:00:00
[ [ "Bennis", "D.", "" ], [ "Mahdou", "N.", "" ] ]
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801.2068
Christine Weber
C. Weber, G. Audi, D. Beck, K. Blaum, G. Bollen, F. Herfurth, A. Kellerbauer, H.-J. Kluge, D. Lunney, and S. Schwarz
Atomic mass measurements of short-lived nuclides around the doubly-magic 208Pb
40 pages, 20 figures, accept. for publication in Nucl. Phys. A
Nucl.Phys.A803:1-29,2008
10.1016/j.nuclphysa.2007.12.014
null
nucl-ex
null
Accurate atomic mass measurements of neutron-deficient and neutron-rich nuclides around the doubly-magic 208Pb and of neutron-rich cesium isotopes were performed with the Penning trap mass spectrometer ISOLTRAP at ISOLDE/CERN. The masses of 145,147Cs, 181,183Tl, 186Tlm, 187Tl, 196Tlm, 205Tl, 197Pbm, 208Pb, 190 to 197Bi, 209,215,216Bi, 203,205,229Fr, and 214,229,230Ra were determined. The obtained relative mass uncertainty in the range of $2 \cdot 10^{-7}$ to $2 \cdot 10^{-8}$ is not only required for safe identification of isomeric states but also allows mapping the detailed structure of the mass surface. A mass adjustment procedure was carried out and the results included into the Atomic Mass Evaluation. The resulting separation energies are discussed and the mass spectrometric and laser spectroscopic data are examined for possible correlations.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 13:03:22 GMT" } ]
2008-11-26T00:00:00
[ [ "Weber", "C.", "" ], [ "Audi", "G.", "" ], [ "Beck", "D.", "" ], [ "Blaum", "K.", "" ], [ "Bollen", "G.", "" ], [ "Herfurth", "F.", "" ], [ "Kellerbauer", "A.", "" ], [ "Kluge", "H. -J.", "" ], [ "Lunney", "D.", "" ], [ "Schwarz", "S.", "" ] ]
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801.2069
Istvan Szita
Istvan Szita and Andras Lorincz
Factored Value Iteration Converges
17 pages, 1 figure
null
null
null
cs.AI cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper we propose a novel algorithm, factored value iteration (FVI), for the approximate solution of factored Markov decision processes (fMDPs). The traditional approximate value iteration algorithm is modified in two ways. For one, the least-squares projection operator is modified so that it does not increase max-norm, and thus preserves convergence. The other modification is that we uniformly sample polynomially many samples from the (exponentially large) state space. This way, the complexity of our algorithm becomes polynomial in the size of the fMDP description length. We prove that the algorithm is convergent. We also derive an upper bound on the difference between our approximate solution and the optimal one, and also on the error introduced by sampling. We analyze various projection operators with respect to their computation complexity and their convergence when combined with approximate value iteration.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 13:09:06 GMT" }, { "version": "v2", "created": "Wed, 13 Aug 2008 15:07:08 GMT" } ]
2008-08-13T00:00:00
[ [ "Szita", "Istvan", "" ], [ "Lorincz", "Andras", "" ] ]
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801.207
Baba Thiam
Abdelkader Mokkadem (LM-Versailles), Mariane Pelletier (LM-Versailles), Baba Thiam (LM-Versailles)
Joint behaviour of semirecursive kernel estimators of the location and of the size of the mode of a probability density function
26 pages
null
null
null
math.ST stat.TH
null
Let $\theta$ and $\mu$ denote the location and the size of the mode of a probability density. We study the joint convergence rates of semirecursive kernel estimators of $\theta$ and $\mu$. We show how the estimation of the size of the mode allows to measure the relevance of the estimation of its location. We also enlighten that, beyond their computational advantage on nonrecursive estimators, the semirecursive estimators are preferable to use for the construction on confidence regions.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 13:11:34 GMT" } ]
2008-01-15T00:00:00
[ [ "Mokkadem", "Abdelkader", "", "LM-Versailles" ], [ "Pelletier", "Mariane", "", "LM-Versailles" ], [ "Thiam", "Baba", "", "LM-Versailles" ] ]
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801.2071
Evelina Viada
Viada Evelina
The optimality of the Boundedness Height Conjecture
12 pages
Journal de Theorie des nombres de bordeaux, 21 (2009), 769-784
null
null
math.NT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We show that the Boundedness Height Conjecture is optimal; all varieties in a power of an elliptic curve which do not satisfy the hypothesis neither satisfy the thesis. The Bounded Height Conjecture is known to hold for varieties in a power of an elliptic curve. We also present some examples and remarks.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 13:14:19 GMT" }, { "version": "v2", "created": "Wed, 16 Jan 2008 12:36:53 GMT" }, { "version": "v3", "created": "Mon, 10 Nov 2008 12:45:34 GMT" } ]
2010-03-29T00:00:00
[ [ "Evelina", "Viada", "" ] ]
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801.2072
Gennady Kozlov
G.A. Kozlov
Bose-Einstein correlations and the stochastic scale of light hadrons emitter source
16 pages
null
10.1142/9789812834959_0010
null
hep-ph
null
Based on quantum field theory at finite temperature we carried out new results for two-particle Bose-Einstein correlation (BEC) function ${C_2}(Q)$ in case of light hadrons. The important parameters of BEC function related to the size of the emitting source, mean multiplicity, stochastic forces range with the particle energy and mass dependence, and the temperature of the source are obtained for the first time. Not only the correlation between identical hadrons are explored but even the off-correlation between non-identical particles are proposed. The correlations of two bosons in 4-momentum space presented in this paper offer useful and instructive complimentary viewpoints to theoretical and experimental works in multiparticle femtoscopy and interferometry measurements at hadron colliders. This paper is the first one to the next opening series of works concerning the searching of BEC with experimental data where the parameters above mentioned will be retrieved.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 13:16:01 GMT" } ]
2017-08-23T00:00:00
[ [ "Kozlov", "G. A.", "" ] ]
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