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711.2608
Akira Yoshioka
Hideki Omori, Yoshiaki Maeda, Naoya Miyazaki, Akira Yoshioka
Expressions of algebra elements and transcendental noncommutative calculus
null
null
10.1142/9789812779649_0001
null
math.QA
null
Ideas from deformation quantization are applied to deform the expression of elements of an algebra. Extending these ideas to certain transcendental elements implies that $\frac{1}{i\h}uv$ in the Weyl algebra is naturally viewed as an indeterminate living in a discrete set $\mathbb{N}{+}{1/2}$ {\it or} ${-}(\mathbb{N}{+}{1/2})$ . This may yield a more mathematical understanding of Dirac's positron theory.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 13:07:21 GMT" }, { "version": "v2", "created": "Fri, 23 Nov 2007 04:41:08 GMT" } ]
2017-08-23T00:00:00
[ [ "Omori", "Hideki", "" ], [ "Maeda", "Yoshiaki", "" ], [ "Miyazaki", "Naoya", "" ], [ "Yoshioka", "Akira", "" ] ]
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711.2609
Tom Claeys
Tom Claeys
The birth of a cut in unitary random matrix ensembles
28 pages, 2 figures
null
null
null
math-ph math.CV math.MP
null
We study unitary random matrix ensembles in the critical regime where a new cut arises away from the original spectrum. We perform a double scaling limit where the size of the matrices tends to infinity, but in such a way that only a bounded number of eigenvalues is expected in the newborn cut. It turns out that limits of the eigenvalue correlation kernel are given by Hermite kernels corresponding to a finite size Gaussian Unitary Ensemble (GUE). When modifying the double scaling limit slightly, we observe a remarkable transition each time the new cut picks up an additional eigenvalue, leading to a limiting kernel interpolating between GUE-kernels for matrices of size k and size k+1. We prove our results using the Riemann-Hilbert approach.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 13:09:32 GMT" } ]
2007-11-19T00:00:00
[ [ "Claeys", "Tom", "" ] ]
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711.261
Pedro Orellana
L. Rosales, P. Orellana, Z. Barticevic and M.Pacheco
Transport properties of graphene nanoribbon heterostructures
3 pages, 4 figures. To appear in Microelectronic Journal
null
null
null
cond-mat.mes-hall
null
We study the electronic and transport properties of heterostructures formed by armchair graphene nanoribbons with intersections of finite length. We describe the system by a tight-binding model and calculate the density of states and the conductance within the Green's function formalism based on real-space renormalization techniques. We show the apparition of interface states and bound states in the continuum which present a strong dependence of the heterostructure geometry. We investigate the effects on the conductance of an external perturbation applied on the edges atoms of the intersection region.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 13:15:34 GMT" } ]
2007-11-19T00:00:00
[ [ "Rosales", "L.", "" ], [ "Orellana", "P.", "" ], [ "Barticevic", "Z.", "" ], [ "Pacheco", "M.", "" ] ]
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711.2611
Senthilkumar Vijayan
D. V. Senthilkumar and M. Lakshmanan
Intermittency transition to generalized synchronization in coupled time-delay systems
Accepted for publication in Physical Review E
null
10.1103/PhysRevE.76.066210
null
nlin.CD
null
In this paper, we report the nature of transition to generalized synchronization (GS) in a system of two coupled scalar piecewise linear time-delay systems using the auxiliary system approach. We demonstrate that the transition to GS occurs via on-off intermittency route and also it exhibits characteristically distinct behaviors for different coupling configurations. In particular, the intermittency transition occurs in a rather broad range of coupling strength for error feedback coupling configuration and in a narrow range of coupling strength for direct feedback coupling configuration. It is also shown that the intermittent dynamics displays periodic bursts of period equal to the delay time of the response system in the former case, while they occur in random time intervals of finite duration in the latter case. The robustness of these transitions with system parameters and delay times has also been studied for both linear and nonlinear coupling configurations. The results are corroborated analytically by suitable stability conditions for asymptotically stable synchronized states and numerically by the probability of synchronization and by the transition of \emph{sub}Lyapunov exponents of the coupled time-delay systems. We have also indicated the reason behind these distinct transitions by referring to unstable periodic orbit theory of intermittency synchronization in low-dimensional systems.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 13:20:06 GMT" } ]
2009-11-13T00:00:00
[ [ "Senthilkumar", "D. V.", "" ], [ "Lakshmanan", "M.", "" ] ]
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711.2612
Vasily E. Tarasov
Vasily E. Tarasov
Map of Discrete System into Continuous
32 pages, LaTeX
Journal of Mathematical Physics.Vol.47. No.9. (2006) 092901
10.1063/1.2337852
null
math-ph math.MP
null
Continuous limits of discrete systems with long-range interactions are considered. The map of discrete models into continuous medium models is defined. A wide class of long-range interactions that give the fractional equations in the continuous limit is discussed. The one-dimensional systems of coupled oscillators for this type of long-range interactions are considered. The discrete equations of motion are mapped into the continuum equation with the Riesz fractional derivative.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 13:23:31 GMT" } ]
2015-03-10T00:00:00
[ [ "Tarasov", "Vasily E.", "" ] ]
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711.2613
{\L}ukasz Pankowski
{\L}ukasz Pankowski, Marco Piani, Micha{\l} Horodecki, Pawe{\l} Horodecki
A few steps more towards NPT bound entanglement
15 pages, Final version for IEEE Trans. Inf. Theory
IEEE Trans. Inf. Theory 56, 4085--4100 (2010)
10.1109/TIT.2010.2050810
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider the problem of existence of bound entangled states with non-positive partial transpose (NPT). As one knows, existence of such states would in particular imply nonadditivity of distillable entanglement. Moreover it would rule out a simple mathematical description of the set of distillable states. Distillability is equivalent to so called n-copy distillability for some n. We consider a particular state, known to be 1-copy nondistillable, which is supposed to be bound entangled. We study the problem of its two-copy distillability, which boils down to show that maximal overlap of some projector Q with Schmidt rank two states does not exceed 1/2. Such property we call the the half-property. We first show that the maximum overlap can be attained on vectors that are not of the simple product form with respect to cut between two copies. We then attack the problem in twofold way: a) prove the half-property for some classes of Schmidt rank two states b) bound the required overlap from above for all Schmidt rank two states. We have succeeded to prove the half-property for wide classes of states, and to bound the overlap from above by c<3/4. Moreover, we translate the problem into the following matrix analysis problem: bound the sum of the squares of the two largest singular values of matrix A \otimes I + I \otimes B with A,B traceless 4x4 matrices, and Tr A^\dagger A + Tr B^\dagger B = 1/4.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 14:19:23 GMT" }, { "version": "v2", "created": "Mon, 15 Feb 2010 14:30:00 GMT" } ]
2010-08-09T00:00:00
[ [ "Pankowski", "Łukasz", "" ], [ "Piani", "Marco", "" ], [ "Horodecki", "Michał", "" ], [ "Horodecki", "Paweł", "" ] ]
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711.2614
Sergy Ratkevich
Yu.M.Gavriljuk (1), V.N.Gavrin (1), A.M.Gangapshev (1), V.V.Kazalov (1), V.V.Kuzminov (1), S.I.Panasenko (2), S.S.Ratkevich (2) (1-Baksan Neutrino Observatory INR RAS, Russia, 2-Karazin Kharkiv National University, Ukraine)
Measurement of surface alpha-acrivity of different samples with ion pulse ionization chamber
6 pages, 7 postscript figures, talk at the XIV-th Int. School "Particles and Cosmology"
null
null
null
physics.ins-det
null
The construction of an ion pulse ionization chamber aimed at measuring ultra-low levels of surface alpha-activity of different samples is described. The results of measurement carried out with alpha-source and copper samples and light-reflecting film VM2000 are presented.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 13:36:21 GMT" } ]
2007-11-19T00:00:00
[ [ "Gavriljuk", "Yu. M.", "" ], [ "Gavrin", "V. N.", "" ], [ "Gangapshev", "A. M.", "" ], [ "Kazalov", "V. V.", "" ], [ "Kuzminov", "V. V.", "" ], [ "Panasenko", "S. I.", "" ], [ "Ratkevich", "S. S.", "" ] ]
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711.2615
Franco Bagnoli
Franco Bagnoli, Francesca Di Patti
A Biologically Inspired Classifier
null
null
null
null
cs.DB cs.IR
null
We present a method for measuring the distance among records based on the correlations of data stored in the corresponding database entries. The original method (F. Bagnoli, A. Berrones and F. Franci. Physica A 332 (2004) 509-518) was formulated in the context of opinion formation. The opinions expressed over a set of topic originate a ``knowledge network'' among individuals, where two individuals are nearer the more similar their expressed opinions are. Assuming that individuals' opinions are stored in a database, the authors show that it is possible to anticipate an opinion using the correlations in the database. This corresponds to approximating the overlap between the tastes of two individuals with the correlations of their expressed opinions. In this paper we extend this model to nonlinear matching functions, inspired by biological problems such as microarray (probe-sample pairing). We investigate numerically the error between the correlation and the overlap matrix for eight sequences of reference with random probes. Results show that this method is particularly robust for detecting similarities in the presence of translocations.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 13:38:15 GMT" } ]
2007-11-19T00:00:00
[ [ "Bagnoli", "Franco", "" ], [ "Di Patti", "Francesca", "" ] ]
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711.2616
Ganesh Bagler Dr
Ganesh Bagler (Centre for Cellular and Molecular Biology, Hyderabad, India)
Modeling Protein Contact Networks
Ph.D. thesis. 118 pages including 12 tables and 37 figures. LaTeX source with included style files. Presently at National Centre for Biological Sciences, Tata Institute of Fundamantal Research, Bangalore, India
null
null
null
q-bio.MN q-bio.BM
null
Proteins are an important class of biomolecules that serve as essential building blocks of the cells. Their three-dimensional structures are responsible for their functions. In this thesis we have investigated the protein structures using a network theoretical approach. While doing so we used a coarse-grained method, viz., complex network analysis. We model protein structures at two length scales as Protein Contact Networks (PCN) and as Long-range Interaction Networks (LINs). We found that proteins by virtue of being characterised by high amount of clustering, are small-world networks. Apart from the small-world nature, we found that proteins have another general property, viz., assortativity. This is an interesting and exceptional finding as all other complex networks (except for social networks) are known to be disassortative. Importantly, we could identify one of the major topological determinant of assortativity by building appropriate controls.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 05:19:25 GMT" } ]
2007-11-19T00:00:00
[ [ "Bagler", "Ganesh", "", "Centre for Cellular and Molecular Biology, Hyderabad,\n India" ] ]
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711.2617
Walid K. Abou Salem
Walid K. Abou Salem
A remark on the mean-field dynamics of many-body bosonic systems with random interactions
6 pages
null
10.1007/s11005-008-0250-y
null
math-ph math.MP
null
The mean-field limit for the dynamics of bosons with random interactions is rigorously studied. It is shown that, for interactions that are almost-surely bounded, the many-body quantum evolution can be replaced in the mean-field limit by a single particle nonlinear evolution that is described by the Hartree equation. This is an Egorov-type theorem for many-body quantum systems with random interactions.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 17:36:07 GMT" } ]
2009-11-13T00:00:00
[ [ "Salem", "Walid K. Abou", "" ] ]
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711.2618
Krzysztof R. Apt
Krzysztof R. Apt, Farhad Arbab, Huiye Ma
A System for Distributed Mechanisms: Design, Implementation and Applications
36 pages; revised and expanded version
null
null
null
cs.DC cs.GT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We describe here a structured system for distributed mechanism design appropriate for both Intranet and Internet applications. In our approach the players dynamically form a network in which they know neither their neighbours nor the size of the network and interact to jointly take decisions. The only assumption concerning the underlying communication layer is that for each pair of processes there is a path of neighbours connecting them. This allows us to deal with arbitrary network topologies. We also discuss the implementation of this system which consists of a sequence of layers. The lower layers deal with the operations that implement the basic primitives of distributed computing, namely low level communication and distributed termination, while the upper layers use these primitives to implement high level communication among players, including broadcasting and multicasting, and distributed decision making. This yields a highly flexible distributed system whose specific applications are realized as instances of its top layer. This design is implemented in Java. The system supports at various levels fault-tolerance and includes a provision for distributed policing the purpose of which is to exclude `dishonest' players. Also, it can be used for repeated creation of dynamically formed networks of players interested in a joint decision making implemented by means of a tax-based mechanism. We illustrate its flexibility by discussing a number of implemented examples.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 14:10:16 GMT" }, { "version": "v2", "created": "Wed, 20 Feb 2008 15:10:54 GMT" }, { "version": "v3", "created": "Mon, 11 Jan 2010 13:23:13 GMT" }, { "version": "v4", "created": "Tue, 20 Sep 2011 15:42:02 GMT" } ]
2011-09-21T00:00:00
[ [ "Apt", "Krzysztof R.", "" ], [ "Arbab", "Farhad", "" ], [ "Ma", "Huiye", "" ] ]
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711.2619
Kateryna Mishchenko
Kateryna Mishchenko, Sverker Holmgren, Lars Ronnegard
Newton-type Methods for REML Estimation in Genetic Analysis of Quantitative Traits
20 pages, 7 figures, 3 tables
null
null
null
q-bio.OT q-bio.QM
null
Robust and efficient optimization methods for variance component estimation using Restricted Maximum Likelihood (REML) models for genetic mapping of quantitative traits are considered. We show that the standard Newton-AI scheme may fail when the optimum is located at one of the constraint boundaries, and we introduce different approaches to remedy this by taking the constraints into account. We approximate the Hessian of the objective function using the average information matrix and also by using an inverse BFGS formula. The robustness and efficiency is evaluated for problems derived from two experimental data from the same animal populations.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 14:02:20 GMT" } ]
2007-11-19T00:00:00
[ [ "Mishchenko", "Kateryna", "" ], [ "Holmgren", "Sverker", "" ], [ "Ronnegard", "Lars", "" ] ]
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711.262
Douglas Heggie
D.C. Heggie and M. Giersz
Modelling individual globular clusters
10 pages,9 figures,invited review, to appear in the proceedings of IAU Symposium 246, 'Dynamical Evolution of Dense Stellar Systems', eds. E. Vesperini, M. Giersz, A. Sills, Capri, Sept. 2007. Sent to the editors 9 October 2007
null
10.1017/S1743921308015469
null
astro-ph
null
Astronomers have constructed models of globular clusters for over 100 years. These models mainly fall into two categories: (i) static models, such as King's model and its variants, and (ii) evolutionary models. Most attention has been given to static models, which are used to estimate mass-to-light ratios and mass segregation, and to combine data from proper motions and radial velocities. Evolutionary models have been developed for a few objects using the gaseous model, the Fokker-Planck model, Monte Carlo models and N-body models. These models have had a significant role in the search for massive black holes in globular clusters, for example. In this presentation the problems associated with these various techniques will be summarised, and then we shall describe new work with Giersz's Monte Carlo code, which has been enhanced recently to include the stellar evolution of single and binary stars. We describe in particular recent attempts to model the nearby globular cluster M4, including predictions on the spatial distribution of binary stars and their semi-major axis distribution, to illustrate the effects of about 12 Gyr of dynamical evolution. We also discuss work on an approximate way of predicting the "initial" conditions for such modelling.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 14:12:30 GMT" } ]
2009-11-13T00:00:00
[ [ "Heggie", "D. C.", "" ], [ "Giersz", "M.", "" ] ]
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711.2621
Philipp Schapotschnikow
Philipp Schapotschnikow and Sven Gnutzmann
Spectra of graphs and semi-conducting polymers
Revised version
null
null
null
math-ph math.MP
null
We study the band gap in some semi-conducting polymers with two models: H\"uckel molecular orbital theory and the so-called free electron model. The two models are directly related to spectral theory on combinatorial and metric graphs.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 13:28:42 GMT" }, { "version": "v2", "created": "Mon, 4 Feb 2008 16:26:46 GMT" } ]
2009-09-29T00:00:00
[ [ "Schapotschnikow", "Philipp", "" ], [ "Gnutzmann", "Sven", "" ] ]
[ -0.0224489253, -0.0122807464, -0.0080091823, -0.087242052, 0.0595697425, 0.0388851613, -0.0739630535, -0.0313634947, -0.0143584907, -0.1222967282, 0.0062680556, -0.1014960706, 0.0007428807, 0.0173764434, 0.0494015664, -0.0451764315, -0.0650020614, 0.1029818356, -0.0073069278, 0.1214609891, -0.0249329321, -0.0331510492, -0.0080962386, 0.0923029259, -0.0585018545, -0.0425995626, 0.0701557919, 0.114589341, 0.1638980508, -0.0443174765, -0.0136968624, -0.0204176102, -0.0645841882, -0.1219252869, -0.0925350711, 0.091745764, -0.1142179072, 0.1141250432, -0.039953053, 0.048380103, -0.0415548868, 0.0386994407, -0.1001031697, 0.0887278095, 0.0806025565, 0.0337778553, 0.015577279, 0.0411138013, 0.0598018952, -0.0128262993, -0.0435049497, 0.0250257924, 0.1163536832, -0.0278348103, 0.0106673017, 0.1022389531, -0.0528373867, 0.0335457064, -0.0948101431, -0.0745202154, -0.022924833, -0.0492158458, 0.0033719819, 0.0075216671, -0.1053961962, 0.0466389768, -0.0431335084, -0.0347528867, 0.0127102239, 0.0710843951, 0.023505209, 0.0454782248, 0.0431799404, -0.0036505621, -0.0066220849, 0.0295295063, -0.0116713522, 0.0489836931, -0.0299473777, 0.0783274844, 0.0305973981, 0.001315276, 0.0708986744, 0.0052669081, -0.0720129982, -0.0889599621, 0.0400459096, -0.0463836119, -0.0859884396, -0.0585018545, 0.1017746553, -0.0612876564, -0.0982459709, 0.0929065123, 0.0150665483, -0.0146138556, 0.009634234, 0.0183282588, -0.0119673433, 0.0308295488, -0.0208935197, 0.0553910397, -0.0173184052, -0.0377244093, 0.0545553006, 0.0311313439, -0.0935565382, 0.0715022683, 0.0115320617, -0.0541374274, -0.0672307014, -0.0094252983, -0.1113392413, 0.082088314, 0.0220658779, -0.068762891, -0.0694593415, -0.0934636742, 0.0921172053, 0.0625412688, -0.0246775672, 0.0544624403, 0.0905385837, -0.0706200972, 0.0600340441, 0.0546017289, -0.0701557919, -0.0700629354, 0.0099302251, 0.0022112308, -0.0065872623, -0.1492261589, -0.0399762653, -0.0538588502, -0.0186300538, -0.0389315896, -0.0305277519, -0.0120137734, 0.1513619423, 0.0474747196, 0.0404173508, 0.0434353054, 0.0825061873, 0.0786060616, 0.0824133232, 0.1156108081, 0.041090589, 0.0735451877, -0.0455246568, 0.0808811337, -0.017562164, -0.0170282181, 0.1117106825, 0.0085895574, 0.0388387293, -0.1111535206, 0.0855705664, 0.0281133913, 0.0245150626, 0.1001960337, 0.0606840663, 0.0437370986, -0.0098721879, -0.024073977, 0.0169005357, 0.0772131607, -0.1313970238, -0.0157165695, 0.015554064, -0.1469046474, -0.0490301251, -0.0694593415, -0.0024985166, -0.0319903009, 0.1210895479, 0.050701607, 0.0008843472, -0.1150536463, -0.0496337153, 0.0205569007, -0.0103945257, -0.0340332203, -0.0016410118, 0.0232266281, -0.0126754018, -0.0295527223, -0.0334760621, 0.0758202597, -0.0622162558, -0.0661163777, -0.048101522, 0.091792196, 0.0928600878, 0.0884956568, -0.0922100618, -0.1248039529, 0.0193497203, 0.1053961962, 0.1063247994, -0.0386065803, 0.0145442104, 0.0124896811, 0.021206921, -0.043621026, -0.0356118418, 0.0010454014, -0.0002207241, -0.1028889716, 0.0489372648, 0.0039697685, 0.0517694987, 0.0572946705, 0.0098199537, -0.0374690443, -0.0145906406, -0.0254436638, -0.0228784028, 0.1180251688, 0.0922564939, 0.116910845, -0.0760524124, -0.0142075932, 0.0522802286, 0.0435281657, 0.1106892228, 0.0453157201, 0.0083922297, 0.0161112249, -0.0271383598, -0.0207658354, -0.068716459, -0.0368422382, -0.0846419632, 0.025211513, -0.0538124181, 0.0115378657, 0.0083167814, 0.0055687032, -0.0523266569, -0.1006603315, -0.0174576957, 0.0079859672, 0.0015539555, 0.1310255826, 0.0433888733, 0.0164362341, -0.0261633284, 0.0187229142, 0.0027248631, -0.0006917351, -0.0452692918, 0.0489372648, -0.0439924635, 0.0520016477, -0.0005462785, -0.030272387 ]
711.2622
Kazuhide Ichikawa
Kazuhide Ichikawa
Neutrino mass constraint from CMB and its degeneracy with other cosmological parameters
3 pages, 2 figures, prepared for the TAUP2007 Proceedings
J.Phys.Conf.Ser.120:022004,2008
10.1088/1742-6596/120/2/022004
null
astro-ph
null
We show that the cosmic microwave background (CMB) data of WMAP can give subelectronvolt limit on the neutrino mass: m_nu < 0.63 eV (95% CL). We also investigate its degeneracy with other cosmological parameters. In particular, we show the Hubble constant derived from the WMAP data decreases considerably when the neutrino mass is a few times 0.1 eV.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 15:33:23 GMT" } ]
2008-11-26T00:00:00
[ [ "Ichikawa", "Kazuhide", "" ] ]
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711.2623
Dirk Oliver Theis
Samuel Fiorini, Gianpaolo Oriolo, Laura Sanit\`a, Dirk Oliver Theis
The VPN Tree Routing Conjecture for Outerplanar Networks
null
null
null
null
math.OC math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The VPN Tree Routing Conjecture is a conjecture about the Virtual Private Network Design problem. It states that the symmetric version of the problem always has an optimum solution which has a tree-like structure. In recent work, Hurkens, Keijsper and Stougie (Proc. IPCO XI, 2005; SIAM J. Discrete Math., 2007) have shown that the conjecture holds when the network is a ring. A shorter proof of the VPN Conjecture for rings was found a few months ago by Grandoni, Kaibel, Oriolo and Skutella (to appear in Oper. Res. Lett., 2008). In their paper, Grandoni et al. introduce another conjecture, called the Pyramidal Routing Conjecture (or simply PR Conjecture), which implies the VPN Conjecture. Here we consider a strengthened version of the PR Conjecture. First we establish several general tools which can be applied in arbitrary networks. Then we use them to prove that outerplanar networks satisfy the PR Conjecture.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 14:41:42 GMT" }, { "version": "v2", "created": "Sat, 5 Jul 2008 09:33:15 GMT" }, { "version": "v3", "created": "Mon, 24 Nov 2008 15:02:12 GMT" } ]
2008-11-24T00:00:00
[ [ "Fiorini", "Samuel", "" ], [ "Oriolo", "Gianpaolo", "" ], [ "Sanità", "Laura", "" ], [ "Theis", "Dirk Oliver", "" ] ]
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711.2624
Miquel Montero
Miquel Montero
Renewal equations for option pricing
19 pages, 5 figures, svjour (epj); Enlarged and revised version, two new figures in a new subsection, and a new appendix added
Eur. Phys. J. B 65, 295-306 (2008)
10.1140/epjb/e2008-00349-8
null
q-fin.PR physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper we will develop a methodology for obtaining pricing expressions for financial instruments whose underlying asset can be described through a simple continuous-time random walk (CTRW) market model. Our approach is very natural to the issue because it is based in the use of renewal equations, and therefore it enhances the potential use of CTRW techniques in finance. We solve these equations for typical contract specifications, in a particular but exemplifying case. We also show how a formal general solution can be found for more exotic derivatives, and we compare prices for alternative models of the underlying. Finally, we recover the celebrated results for the Wiener process under certain limits.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 18:28:42 GMT" }, { "version": "v2", "created": "Mon, 25 Feb 2008 10:55:46 GMT" }, { "version": "v3", "created": "Mon, 30 Jun 2008 18:51:13 GMT" } ]
2008-12-02T00:00:00
[ [ "Montero", "Miquel", "" ] ]
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711.2625
Pasquini Barbara
Sigfrido Boffi and Barbara Pasquini (Pavia U. and INFN, Pavia)
Generalized parton distributions and the structure of the nucleon
62 pages; 24 figures; version to appear in "La Rivista del Nuovo Cimento"
Riv.Nuovo Cim.30:387,2007
10.1393/ncr/i2007-10025-7
null
hep-ph hep-ex nucl-th
null
Generalized parton distributions have been introduced in recent years as a suitable theoretical tool to study the structure of the nucleon. Unifying the concepts of parton distributions and hadronic form factors, they provide a comprehensive framework for describing the quark and gluon structure of the nucleon. In this review their formal properties and modeling are discussed, summarizing the most recent developments in the phenomenological description of these functions. The status of available data is also presented.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 14:38:48 GMT" }, { "version": "v2", "created": "Mon, 28 Jan 2008 15:53:48 GMT" } ]
2011-09-30T00:00:00
[ [ "Boffi", "Sigfrido", "", "Pavia U. and INFN, Pavia" ], [ "Pasquini", "Barbara", "", "Pavia U. and INFN, Pavia" ] ]
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711.2626
Gordon Moorhouse
R. Gordon Moorhouse
Fermion Masses from SO(10) Hermitian Matrices
23 pages. Small textual additions for clarification; formalism and results unchanged. Version to appear in Phys. Rev. D
Phys.Rev.D77:053006,2008
10.1103/PhysRevD.77.053006
null
hep-ph
null
Masses of fermions in the SO(10) 16-plet are constructed using only the 10, 120 and 126 scalar multiplets. The mass matrices are restricted to be hermitian and the theory is constructed to have certain assumed quark masses, charged lepton masses and CKM matrix in accord with data. The remaining free parameters are found by fitting to light neutrino masses and MSN matrices result as predictions.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 14:57:54 GMT" }, { "version": "v2", "created": "Thu, 22 Nov 2007 15:23:10 GMT" }, { "version": "v3", "created": "Thu, 7 Feb 2008 16:38:47 GMT" } ]
2008-11-26T00:00:00
[ [ "Moorhouse", "R. Gordon", "" ] ]
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711.2627
Marcella Massardi
M. Massardi, A. Lapi, G. De Zotti, R. D. Ekers and L. Danese
Observability of the virialization phase of spheroidal galaxies with radio arrays
11 pages, 9 figures. Accepted for publication on MNRAS. Minor changes added
null
10.1111/j.1365-2966.2007.12732.x
null
astro-ph
null
In the standard galaxy formation scenario plasma clouds with a high thermal energy content must exist at high redshifts since the proto-galactic gas is shock heated to the virial temperature, and extensive cooling, leading to efficient star formation, must await the collapse of massive halos (as indicated by the massive body of evidence, referred to as "downsizing"). Massive plasma clouds are potentially observable through the thermal and kinetic Sunyaev-Zel'dovich effects and their free-free emission. We find that the detection of substantial numbers of galaxy-scale thermal SZ signals is achievable by blind surveys with next generation radio telescope arrays such as EVLA, ALMA and SKA. This population is even detectable with the 10% SKA, and wide field of view options at high frequency on any of these arrays would greatly increase survey speed. An analysis of confusion effects and of the contamination by radio and dust emissions shows that the optimal frequencies are those in the range 10-35 GHz. Predictions for the redshift distributions of detected sources are also worked out.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 14:58:49 GMT" }, { "version": "v2", "created": "Thu, 22 Nov 2007 16:15:18 GMT" } ]
2009-11-13T00:00:00
[ [ "Massardi", "M.", "" ], [ "Lapi", "A.", "" ], [ "De Zotti", "G.", "" ], [ "Ekers", "R. D.", "" ], [ "Danese", "L.", "" ] ]
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711.2628
Alessandro Nagar
Thibault Damour, Alessandro Nagar
Comparing Effective-One-Body gravitational waveforms to accurate numerical data
15 pages, 7 figures, submitted to Phys. Rev. D. Revised version. Figs. 2-7 improved. Slight changes in a few numbers. One reference added
Phys.Rev.D77:024043,2008
10.1103/PhysRevD.77.024043
null
gr-qc
null
We continue the program of constructing, within the Effective-One-Body (EOB) approach, high accuracy, faithful analytic waveforms describing the gravitational wave signal emitted by inspiralling and coalescing binary black holes (BHs). We present the comparable-mass version of a new, resummed 3PN-accurate EOB quadrupolar waveform recently introduced in the small-mass-ratio limit. We compare the phase and the amplitude of this waveform to the recently published results of a high-accuracy numerical relativity (NR) simulation of 15 orbits of an inspiralling equal-mass binary BHs system performed by the Caltech-Cornell group. We find a remarkable agreement, both in phase and in amplitude, between the new EOB waveform and the published numerical data. More precisely: (i) in the gravitational wave (GW) frequency domain $M\omega <0.08$ where the phase of one of the non-resummed ``Taylor approximant'' (T4) waveform matches well with the numerical relativity one, we find that the EOB phase fares as well, while (ii) for higher GW frequencies, $0.08<M\omega\lesssim 0.14$, where the TaylorT4 approximant starts to significantly diverge from the NR phase, we show that the EOB phase continues to match well the NR one. We further propose various methods of tuning the two inspiral flexibility parameters, $a_5$ and $v_{\rm pole}$, of the EOB waveform so as to ``best fit'' EOB predictions to numerical data. We find that the maximal dephasing between EOB and NR can then be reduced below $10^{-3}$ GW cycles over the entire span (30 GW cycles) of the simulation. Our resummed EOB amplitude agrees much better with the NR one than any of the previously considered non-resummed, post-Newtonian one.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 15:00:01 GMT" }, { "version": "v2", "created": "Wed, 19 Dec 2007 16:24:40 GMT" } ]
2008-11-26T00:00:00
[ [ "Damour", "Thibault", "" ], [ "Nagar", "Alessandro", "" ] ]
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711.2629
Carlos Rodrigo Blanco
Carlos Rodrigo, Raul Gutierrez, Enrique Solano, Miguel Cervino
Theoretical models in the Virtual Observatory
null
null
null
null
astro-ph
null
Although full interoperativity between theoretical and observational data in the framework of the Virtual Observatory would be a very desirable achievement, the current status of VO offers few approaches to handle theoretical models. TSAP (Theoretical Spectra Access Protocol) has been proposed as a tool to fill this void, providing a simple scheme to easily operate with th is kind of data. TSAP is useful not only for synthetic spectra but also for other types of theoretical data. As an example we show an Isochrone and Evolutionary Tracks server using TSAP. Finally, we pay special attention to the correct treatment of the credits an important issue in the field of theoretical models.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 18:17:30 GMT" } ]
2007-11-19T00:00:00
[ [ "Rodrigo", "Carlos", "" ], [ "Gutierrez", "Raul", "" ], [ "Solano", "Enrique", "" ], [ "Cervino", "Miguel", "" ] ]
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711.263
John J. Eldridge
John Eldridge
Mass loss and supernova progenitors
7 pages, 3 figures, to appear in the Conference Proceedings of "Unsolved Problems in Stellar Astrophysics"
AIPConf.Proc.948:405-411,2007
10.1063/1.2819001
null
astro-ph
null
We first discuss the mass range of type IIP SN progenitors and how the upper and lower limits impose interesting constraints on stellar evolution. Then we discuss the possible implications of two SNe, 2002ap and 2006jc, for Wolf-Rayet star mass-loss rates and long Gamma-ray bursts.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 15:06:35 GMT" } ]
2008-11-26T00:00:00
[ [ "Eldridge", "John", "" ] ]
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711.2631
Joaqu\'in Gonz\'alez-Nuevo
J. Gonz\'alez-Nuevo, M. Massardi, F. Arg\"ueso, D. Herranz, L. Toffolatti, J.L. Sanz, M. L\'opez-Caniego and G. De Zotti
Statistical properties of extragalactic sources in the New Extragalactic WMAP Point Source (NEWPS) catalogue
8 pages, 4 figures. Accepted for publication in MNRAS
null
10.1111/j.1365-2966.2007.12733.x
null
astro-ph
null
We present results on spectral index distributions, number counts, redshift distribution and other general statistical properties of extragalactic point sources in the NEWPS5 sample L\'opez-Caniego et al. (2007). The flux calibrations at all the WMAP channels have been reassessed both by comparison with ground based observations and through estimates of the effective beam areas. The two methods yield consistent statistical correction factors. A search of the NED has yielded optical identifications for 89% of sources in the complete sub-sample of 252 sources with S/N>5 and S>1.1 Jy at 23 GHz; 5 sources turned out to be Galactic and were removed. The NED also yielded redshifts for 92% of the extragalactic sources at |b|>10deg. Their distribution was compared with model predictions; the agreement is generally good but a possible discrepancy is noted. Using the 5 GHz fluxes from the GB6 or PMN surveys, we find that 76% of the 191 extragalactic sources with S_23GHz>1.3,Jy can be classified as flat-spectrum sources between 5 and 23 GHz. A spectral steepening is observed at higher frequencies: only 59% of our sources are still flat-spectrum sources between 23 and 61 GHz and the average spectral indexes steepen from <alpha_5^23>= 0.01\pm 0.03 to <alpha_41^61>= 0.37\pm 0.03. We think, however, that the difference may be due to a selection effect. The source number counts have a close to Euclidean slope and are in good agreement with the predictions of the cosmological evolution model by De Zotti et al. (2005). The observed spectral index distributions were exploited to get model-independent extrapolations of counts to higher frequencies. The risks of such operations are discussed and reasons of discrepancies with other recent estimates are clarified.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 15:07:24 GMT" } ]
2009-11-13T00:00:00
[ [ "González-Nuevo", "J.", "" ], [ "Massardi", "M.", "" ], [ "Argüeso", "F.", "" ], [ "Herranz", "D.", "" ], [ "Toffolatti", "L.", "" ], [ "Sanz", "J. L.", "" ], [ "López-Caniego", "M.", "" ], [ "De Zotti", "G.", "" ] ]
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711.2632
Dimitrios Giannios
Dimitrios Giannios (Max Planck Institute for Astrophysics)
Prompt GRB emission from gradual energy dissipation
9 pages, 3 figures, A&A, small changes to match the accepted Paper
Astron.Astrophys.480:305,2008
10.1051/0004-6361:20079085
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
I calculate the emission expected from a Poynting-flux-dominated gamma-ray burst (GRB) flow in which energy is dissipated gradually by magnetic reconnection. In this picture, the energy of the radiating particles is determined by heating and cooling balance (slow heating model). Detailed radiative transfer calculations show that, at Thomson optical depths of order of unity, the dominant radiative process is inverse Compton scattering. Synchrotron-self-absorbed emission and inverse Compton dominate in the Thomson thin parts of the flow. The electrons stay thermal throughout the dissipation region because of Coulomb collisions (Thomson thick part of the flow) and exchange of synchrotron photons (Thomson thin part). The resulting spectrum naturally explains the observed sub-MeV break of the GRB emission and the spectral slopes above and below the break. The model predicts that the gamma-ray power-law tail has a high-energy cutoff typically in the ~0.1-1 GeV energy range that should be observable with {\it GLAST}. The model also predicts a prompt emission component in the optical and UV associated with the GeV emission. Observations of the prompt emission of GRB 061121 that cover the energy range from the optical to ~1 MeV are explained by the model.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 15:08:26 GMT" }, { "version": "v2", "created": "Thu, 4 Sep 2008 09:32:58 GMT" } ]
2008-11-26T00:00:00
[ [ "Giannios", "Dimitrios", "", "Max Planck Institute for Astrophysics" ] ]
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711.2633
Samy Tindel
Andreas Neuenkirch, Ivan Nourdin (PMA), Samy Tindel (IECN)
Delay equations driven by rough paths
34 p
null
null
null
math.PR
null
In this article, we illustrate the flexibility of the algebraic integration formalism introduced by M. Gubinelli (2004), by establishing an existence and uniqueness result for delay equations driven by rough paths. We then apply our results to the case where the driving path is a fractional Brownian motion with Hurst parameter H>1/3.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 15:10:30 GMT" } ]
2007-11-19T00:00:00
[ [ "Neuenkirch", "Andreas", "", "PMA" ], [ "Nourdin", "Ivan", "", "PMA" ], [ "Tindel", "Samy", "", "IECN" ] ]
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711.2634
Kenji Fukushima
Kenji Fukushima
Erratum: Initial fields and instability in the classical model of the heavy-ion collision
This erratum corrects a missing factor in the formula in Phys.Rev.C76, 021902 (2007) [arXiv:0704.3625 [hep-ph]]
null
null
null
hep-ph
null
We correct a mistake in the analytical expression for the energy density given in Phys. Rev. C76, 021902 (2007) [arXiv:0704.3625 [hep-ph]]. The expression should be multiplied by 16. One question then arises; how could it be possible to explain this difference between the analytical and numerical results in the same model if both are correct? We find a subtle problem in the treatment of the randomness of the color source along the longitudinal direction and the treatment of the longitudinal extent of the color source.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 15:12:43 GMT" } ]
2007-11-19T00:00:00
[ [ "Fukushima", "Kenji", "" ] ]
[ 0.0033716196, -0.0048405416, -0.0329143703, 0.0697195753, 0.0277353507, -0.0593615398, -0.0517901815, 0.039302703, 0.0052776034, 0.0271306951, 0.0054583433, 0.0420368016, -0.0761867762, 0.0466374531, -0.0249749608, 0.1332348436, 0.089909859, -0.0150769893, -0.0260396823, 0.0134273274, -0.1168302372, -0.1153580323, 0.0325200297, 0.0115279164, -0.0620430596, -0.0607285872, 0.0812343433, -0.0970605835, 0.051185526, -0.0482411087, -0.0077882442, -0.0344654471, -0.071454674, -0.135232836, -0.1149374023, 0.1369153708, 0.0338607877, 0.1026339456, -0.0853880793, -0.0119748367, -0.0212155711, 0.0248960927, -0.0777115598, 0.1317626387, -0.0168383811, 0.0006071216, 0.0068023908, -0.0715072528, 0.1174611822, -0.0356484689, 0.000049267, -0.0390135162, 0.0267889313, -0.0620430596, -0.0357010476, -0.0429043546, 0.0478993468, 0.0153267393, -0.0054320539, -0.089278914, -0.0285240337, -0.0583099611, -0.0959038511, -0.0570480675, -0.0914346427, -0.0710866228, 0.0038448295, -0.0336504728, 0.1405958831, 0.0800776109, -0.0552603863, -0.008563783, 0.0178110898, -0.0138545306, 0.0582573824, -0.0451126657, 0.0015773659, -0.0237262137, -0.1166199222, 0.1136755049, 0.0504494198, 0.0364108644, 0.0120668495, -0.1138858199, -0.0209000986, -0.0094181895, 0.0766599849, 0.0036772343, -0.1140961349, -0.025632197, 0.0443239845, 0.042720329, -0.0498184748, 0.0925388038, 0.0728743076, -0.1524787098, 0.035885077, -0.0396181755, 0.1222984418, 0.0123757506, -0.035306707, 0.0367789157, 0.0331509747, -0.0363845751, 0.1285027415, -0.0516324453, -0.0352541283, 0.0004097455, -0.0847571269, -0.0156947915, 0.1084176227, -0.063988477, -0.0526314452, -0.0233975947, -0.0680896267, -0.0092210183, -0.101529792, 0.0524999984, -0.0715598315, 0.0924862251, 0.0051724459, 0.0317839235, 0.1135703474, -0.0853355005, 0.0805508196, -0.0383299924, 0.1037380993, -0.030679768, -0.1042638868, -0.0288132187, 0.120721072, -0.033808209, -0.0830220282, -0.0331509747, -0.0521845222, -0.0455070063, 0.0558387563, 0.0056850896, 0.0515272878, -0.0933800638, 0.0298647955, 0.048057083, -0.0306534786, 0.0394867286, 0.0090172756, 0.0376464687, 0.0094904853, -0.0587305911, 0.1224035993, 0.0587305911, -0.0320468172, 0.0049095517, -0.0036246555, -0.0661442131, -0.016049698, -0.1624686867, 0.1013194695, 0.1001101583, 0.0102923131, -0.0060399971, 0.0427729078, 0.0610966422, -0.1063670442, -0.0667225793, 0.0868077055, -0.0351226814, -0.0987431109, -0.0613069572, -0.0685628429, -0.1184076071, -0.0510277897, -0.0381722562, -0.0201377049, -0.0789208785, 0.0154976202, 0.0044264831, 0.0118828239, -0.0183500238, -0.0474261343, 0.0088989725, 0.0679844692, 0.0752403587, 0.038724333, 0.0046039368, -0.0336241834, -0.093327485, 0.0334927365, 0.0871231779, 0.032966949, -0.064409107, -0.0029674198, 0.0730846226, 0.0219122414, 0.067195788, -0.0902779102, -0.0654606894, 0.0208343752, 0.0735578313, 0.015379318, 0.015629068, -0.0251589864, 0.0809714496, 0.0462956913, -0.0276564825, -0.0245937649, 0.0255401842, 0.0532361008, 0.0274461675, -0.0951151699, -0.0105880685, 0.0700876266, -0.0091027161, 0.0225168988, -0.0403279886, -0.009234163, -0.0032418156, -0.0703505203, 0.0981121585, 0.0053170379, 0.0319942385, -0.0248698033, 0.0537618883, 0.064409107, 0.0524211265, -0.0158788171, -0.0284451656, 0.1160941347, -0.0326514766, -0.051895339, 0.0909088552, 0.0415110141, 0.0259476695, -0.0536304414, 0.0019207717, -0.0377253368, -0.1331296861, 0.0544191264, 0.0259476695, -0.0195987727, -0.0409852266, 0.0188495237, 0.0117842378, -0.0690360516, 0.0307323467, -0.0392501242, 0.0061582997, -0.0261316951, 0.0727691501, 0.1131497175, -0.0307849254, 0.0586254336, 0.0434301421, 0.0141042806, -0.0841261819, -0.0498184748, -0.0106735099 ]
711.2635
Elizabeth Werbos
Elizabeth S. Werbos
The chiral condensate in a constant electromagnetic field at O(p^6)
7 pages, 4 figures
Phys.Rev.C77:065202,2008
10.1103/PhysRevC.77.065202
null
hep-ph
null
We examine the shift in the chiral condensate due to a constant electromagnetic field at ${\cal O}(p^6)$ using SU(2) chiral perturbation theory and a realistic $M_\pi = 140 \textrm{MeV}$. We find that this value differs significantly from the value calculated using $M_\pi = 0$, while the magnitude of the two-loop correction is unclear due to the uncertainty in the experimentally determined value of the relevant ${\cal L}_6$ LEC.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 15:16:34 GMT" } ]
2008-11-26T00:00:00
[ [ "Werbos", "Elizabeth S.", "" ] ]
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711.2636
Peter Marquard
A. Maier, P. Maierhoefer and P. Marquard
Higher Moments of Heavy Quark Correlators in the Low Energy Limit at O(alpha_s^2)
32 pages, 7 figures
Nucl.Phys.B797:218-242,2008
10.1016/j.nuclphysb.2007.12.035
TTP07-32, SFB/CPP-07-76
hep-ph
null
We present the first 30 moments of the low energy expansions of the vector, axial-vector, scalar and pseudo-scalar heavy quark correlation functions at three-loop order, including the singlet contribution which appears for the first time at three loops. In addition we compare the behavior of the moments for large n with the prediction from threshold calculations.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 15:29:32 GMT" } ]
2008-11-26T00:00:00
[ [ "Maier", "A.", "" ], [ "Maierhoefer", "P.", "" ], [ "Marquard", "P.", "" ] ]
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711.2637
Sergy Ratkevich
Yu.M.Gavriljuk (1), V.N.Gavrin (1), A.M.Gangapshev (1), V.V.Kazalov (1), V.V.Kuzminov (1), S.I.Panasenko (2), S.S.Ratkevich (2) (1-Baksan Neutrino Observatory INR RAS, Russia, 2-Karazin Kharkiv National University, Ukraine)
Comparative analysis of spectra of the background of the proportional counter filled with Kr, enriched in Kr-78, and with Kr of natural content
4 pages, 7 postscript figures, talk at the XIV-th Int. School "Particles and Cosmology"
null
null
null
nucl-ex
null
The results of the experiment searching for 2K-capture with large low-background proportional counter are presented. The comparison of spectra of the background of the proportional counter filled with Kr enriched in $^{78}$Kr (8400 hr) and with natural Kr (3039 hr) is given. A new limit on the half-life of $^{78}$Kr with regard to 2K-capture, T$_{1/2}\geq2.0\cdot10^{21}$ yrs (95% C.L.) has been obtained.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 15:25:06 GMT" } ]
2007-11-19T00:00:00
[ [ "Gavriljuk", "Yu. M.", "" ], [ "Gavrin", "V. N.", "" ], [ "Gangapshev", "A. M.", "" ], [ "Kazalov", "V. V.", "" ], [ "Kuzminov", "V. V.", "" ], [ "Panasenko", "S. I.", "" ], [ "Ratkevich", "S. S.", "" ] ]
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711.2638
Cedric M. Campos
Cedric M. Campos, Marcelo Epstein, Manuel de Leon
Functionally Graded Media
20 pages, 5 figures
null
10.1063/1.2958170
null
math.DG math-ph math.MP
null
The notions of uniformity and homogeneity of elastic materials are reviewed in terms of Lie groupoids and frame bundles. This framework is also extended to consider the case Functionally Graded Media, which allows us to obtain some homogeneity conditions.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 15:27:27 GMT" } ]
2009-11-13T00:00:00
[ [ "Campos", "Cedric M.", "" ], [ "Epstein", "Marcelo", "" ], [ "de Leon", "Manuel", "" ] ]
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711.2639
J. Schaffner-Bielich
Jurgen Schaffner-Bielich, Stefan Schramm, Horst Stocker
Strangeness in Relativistic Astrophysics
26 pages, 14 figures, lecture notes for the course given at the International School of Physics Enrico Fermi on "Strangeness and Spin in Fundamental Physics", Varenna, June 19-29, 2007
null
null
null
astro-ph nucl-th
null
In these lecture notes, the role of strangeness in relativistic astrophysics of compact stars is addressed. The appearance of strange particles, as hyperons, kaons, and strange quarks, in the core of compact stars is examined and common features as well as differences are presented. Impacts on the global properties of compact stars and signals of the presence of exotic matter are outlined for the various strange phases which can appear in the interior at high densities.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 15:54:19 GMT" } ]
2007-11-19T00:00:00
[ [ "Schaffner-Bielich", "Jurgen", "" ], [ "Schramm", "Stefan", "" ], [ "Stocker", "Horst", "" ] ]
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711.264
Michael Creutz
Michael Creutz
The 't Hooft vertex revisited
22 pages, 5 figures
Annals Phys.323:2349-2365,2008
10.1016/j.aop.2007.12.008
null
hep-ph hep-lat
null
In 1976 't Hooft introduced an elegant approach towards understanding the physical consequences of the topological structures that appear in non-Abelian gauge theories. These effects are concisely summarized in terms of an effective multi-fermion interaction. These old arguments provide a link between a variety of recent and sometimes controversial ideas including discrete chiral symmetries appearing in some models for unification, ambiguities in the definition of quark masses, and flaws with some simulation algorithms in lattice gauge theory.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 15:56:57 GMT" } ]
2009-11-18T00:00:00
[ [ "Creutz", "Michael", "" ] ]
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711.2641
Filippo Caruso
Filippo Caruso and Constantino Tsallis
Extensive nonadditive entropy in quantum spin chains
9 pages, 4 figures, Invited Paper presented at the international conference CTNEXT07, satellite of STATPHYS23, 1-5 July 2007, Catania, Italy
AIP conference Proceedings 965 (2007) p. 51
10.1063/1.2828759
null
cond-mat.stat-mech quant-ph
null
We present details on a physical realization, in a many-body Hamiltonian system, of the abstract probabilistic structure recently exhibited by Gell-Mann, Sato and one of us (C.T.), that the nonadditive entropy $S_q=k [1- Tr \hat{\rho}^q]/[q-1]$ ($\hat{\rho}\equiv$ density matrix; $S_1=-k Tr \hat{\rho} \ln \hat{\rho}$) can conform, for an anomalous value of q (i.e., q not equal to 1), to the classical thermodynamical requirement for the entropy to be extensive. Moreover, we find that the entropic index q provides a tool to characterize both universal and nonuniversal aspects in quantum phase transitions (e.g., for a L-sized block of the Ising ferromagnetic chain at its T=0 critical transverse field, we obtain $\lim_{L\to\infty}S_{\sqrt{37}-6}(L)/L=3.56 \pm 0.03$). The present results suggest a new and powerful approach to measure entanglement in quantum many-body systems. At the light of these results, and similar ones for a d=2 Bosonic system discussed by us elsewhere, we conjecture that, for blocks of linear size L of a large class of Fermionic and Bosonic d-dimensional many-body Hamiltonians with short-range interaction at T=0, we have that the additive entropy $S_1(L) \propto [L^{d-1}-1]/(d-1)$ (i.e., $ \ln L$ for $d=1$, and $ L^{d-1}$ for d>1), hence it is not extensive, whereas, for anomalous values of the index q, we have that the nonadditive entropy $S_q(L)\propto L^d$ ($\forall d$), i.e., it is extensive. The present discussion neatly illustrates that entropic additivity and entropic extensivity are quite different properties, even if they essentially coincide in the presence of short-range correlations.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 16:03:32 GMT" } ]
2009-11-13T00:00:00
[ [ "Caruso", "Filippo", "" ], [ "Tsallis", "Constantino", "" ] ]
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711.2642
Nihar Jindal
Giuseppe Caire, Nihar Jindal, Mari Kobayashi, Niranjay Ravindran
Multiuser MIMO Achievable Rates with Downlink Training and Channel State Feedback
Revised for IEEE Trans. Information Theory, May 2009. (Original submission: Nov. 2007)
null
10.1109/TIT.2010.2046225
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider a MIMO fading broadcast channel and compute achievable ergodic rates when channel state information is acquired at the receivers via downlink training and it is provided to the transmitter by channel state feedback. Unquantized (analog) and quantized (digital) channel state feedback schemes are analyzed and compared under various assumptions. Digital feedback is shown to be potentially superior when the feedback channel uses per channel state coefficient is larger than 1. Also, we show that by proper design of the digital feedback link, errors in the feedback have a minor effect even if simple uncoded modulation is used on the feedback channel. We discuss first the case of an unfaded AWGN feedback channel with orthogonal access and then the case of fading MIMO multi-access (MIMO-MAC). We show that by exploiting the MIMO-MAC nature of the uplink channel, a much better scaling of the feedback channel resource with the number of base station antennas can be achieved. Finally, for the case of delayed feedback, we show that in the realistic case where the fading process has (normalized) maximum Doppler frequency shift 0 < F < 1/2, a fraction 1 - 2F of the optimal multiplexing gain is achievable. The general conclusion of this work is that very significant downlink throughput is achievable with simple and efficient channel state feedback, provided that the feedback link is properly designed.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 16:04:23 GMT" }, { "version": "v2", "created": "Fri, 8 May 2009 18:51:41 GMT" } ]
2016-11-17T00:00:00
[ [ "Caire", "Giuseppe", "" ], [ "Jindal", "Nihar", "" ], [ "Kobayashi", "Mari", "" ], [ "Ravindran", "Niranjay", "" ] ]
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711.2643
Daniele Marinazzo
Daniele Marinazzo, Mario Pellicoro, Sebastiano Stramaglia
Kernel method for nonlinear Granger causality
Revised version, accepted for publication on Physical Review Letters
null
10.1103/PhysRevLett.100.144103
null
cond-mat.dis-nn nlin.SI
null
Important information on the structure of complex systems, consisting of more than one component, can be obtained by measuring to which extent the individual components exchange information among each other. Such knowledge is needed to reach a deeper comprehension of phenomena ranging from turbulent fluids to neural networks, as well as complex physiological signals. The linear Granger approach, to detect cause-effect relationships between time series, has emerged in recent years as a leading statistical technique to accomplish this task. Here we generalize Granger causality to the nonlinear case using the theory of reproducing kernel Hilbert spaces. Our method performs linear Granger causality in the feature space of suitable kernel functions, assuming arbitrary degree of nonlinearity. We develop a new strategy to cope with the problem of overfitting, based on the geometry of reproducing kernel Hilbert spaces. Applications to coupled chaotic maps and physiological data sets are presented.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 16:11:50 GMT" }, { "version": "v2", "created": "Thu, 20 Mar 2008 09:34:42 GMT" } ]
2009-11-13T00:00:00
[ [ "Marinazzo", "Daniele", "" ], [ "Pellicoro", "Mario", "" ], [ "Stramaglia", "Sebastiano", "" ] ]
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711.2644
Mikhail Plyushchay
Pedro D. Alvarez, Joaquim Gomis, Kiyoshi Kamimura, Mikhail S. Plyushchay
Anisotropic harmonic oscillator, non-commutative Landau problem and exotic Newton-Hooke symmetry
12 pages
Phys.Lett.B659:906-912,2008
10.1016/j.physletb.2007.12.016
CERN-PH-TH/2007-220, UB-ECM-PF-07-32, Toho-CP-0786
hep-th
null
We investigate the planar anisotropic harmonic oscillator with explicit rotational symmetry as a particle model with non-commutative coordinates. It includes the exotic Newton-Hooke particle and the non-commutative Landau problem as special, isotropic and maximally anisotropic, cases. The system is described by the same (2+1)-dimensional exotic Newton-Hooke symmetry as in the isotropic case, and develops three different phases depending on the values of the two central charges. The special cases of the exotic Newton-Hooke particle and non-commutative Landau problem are shown to be characterized by additional, so(3) or so(2,1) Lie symmetry, which reflects their peculiar spectral properties.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 18:23:49 GMT" } ]
2008-11-26T00:00:00
[ [ "Alvarez", "Pedro D.", "" ], [ "Gomis", "Joaquim", "" ], [ "Kamimura", "Kiyoshi", "" ], [ "Plyushchay", "Mikhail S.", "" ] ]
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711.2645
Rikard Nelander
Rikard Nelander, Andreas Wacker
Temperature dependence of the gain profile for THz quantum cascade lasers
4 pages, 4 figures
Appl. Phys. Lett. 92, 081102 (2008)
10.1063/1.2884686
null
cond-mat.mes-hall
null
We study the rapid decrease of peak gain in resonant-phonon THz Quantum Cascade Lasers with increasing temperature. The effect of various microscopic scattering processes on the gain profile as a function of temperature is discussed. We argue that increased broadening, primarily due to increased impurity scattering, and not diminishing population inversion, is the main reason for the reduction of peak gain.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 16:14:36 GMT" }, { "version": "v2", "created": "Tue, 19 Feb 2008 14:16:50 GMT" } ]
2008-06-16T00:00:00
[ [ "Nelander", "Rikard", "" ], [ "Wacker", "Andreas", "" ] ]
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711.2646
Monica Forte
Luis P. Chimento, Monica Forte and Gilberto M. Kremer
Cosmological model with interactions in the dark sector
6 pages, 8 figures
Gen.Rel.Grav.41:1125-1137,2009
10.1007/s10714-008-0694-5
null
astro-ph gr-qc hep-th
null
A cosmological model is proposed for the current Universe consisted of non-interacting baryonic matter and interacting dark components. The dark energy and dark matter are coupled through their effective barotropic indexes, which are considered as functions of the ratio between their energy densities. It is investigated two cases where the ratio is asymptotically stable and their parameters are adjusted by considering best fits to Hubble function data. It is shown that the deceleration parameter, the densities parameters, and the luminosity distance have the correct behavior which is expected for a viable present scenario of the Universe.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 20:01:52 GMT" }, { "version": "v2", "created": "Wed, 21 Nov 2007 20:45:32 GMT" }, { "version": "v3", "created": "Thu, 22 Nov 2007 17:40:16 GMT" } ]
2009-06-15T00:00:00
[ [ "Chimento", "Luis P.", "" ], [ "Forte", "Monica", "" ], [ "Kremer", "Gilberto M.", "" ] ]
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711.2647
Konstanze Zwintz
K. Zwintz
Comparing the observational instability regions for pulsating pre-main sequence and classical $\delta$ Scuti stars
accepted by ApJ
null
10.1086/524293
null
astro-ph
null
A comparison of the hot and cool boundaries of the classical instability strip with observations has been an important test for stellar structure and evolution models of post- and main sequence stars. Over the last few years, the number of pulsating pre-main sequence (PMS) stars has increased significantly: 36 PMS pulsators and candidates are known as of June 2007. This number allows to investigate the location of the empirical PMS instability region and to compare its boundaries to those of the classical (post- and main sequence) instability strip. Due to the structural differences of PMS and (post-)main sequence stars, the frequency spacings for nonradial modes will be measurably different, thus challenging asteroseismology as a diagnostic tool.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 16:20:40 GMT" } ]
2009-11-13T00:00:00
[ [ "Zwintz", "K.", "" ] ]
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711.2648
Serge Huant
A. Drezet, A. Hohenau, J.R. Krenn, M. Brun, S. Huant
Surface Plasmon mediated near-field imaging and optical addressing in nanoscience
null
Micron 38, 427 (2007)
10.1016/j.micron.2006.06.011
null
physics.optics cond-mat.other
null
We present an overview of recent progress in plasmonics. We focus our study on the observation and excitation of surface plasmon polaritons (SPPs) with optical near-field microscopy. We discuss in particular recent applications of photon scanning tunnelling microscope (PSTM) for imaging of SPP propagating in metal and dielectric wave guides. We show how near-field scanning optical microscopy (NSOM) can be used to optically and actively address remotely nano-objects such as quantum dots. Additionally we compare results obtained with near-field microscopy to those obtained with other optical far-field methods of analysis such as leakage radiation microscopy (LRM).
[ { "version": "v1", "created": "Fri, 16 Nov 2007 16:31:30 GMT" } ]
2007-11-19T00:00:00
[ [ "Drezet", "A.", "" ], [ "Hohenau", "A.", "" ], [ "Krenn", "J. R.", "" ], [ "Brun", "M.", "" ], [ "Huant", "S.", "" ] ]
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711.2649
Andrey Lobanov
E. V. Arbuzova, A. E. Lobanov, and E. M. Murchikova
Neutrino spin rotation in dense matter and electromagnetic field
11 pages, latex, misprints are corrected
Phys.Atom.Nucl.72:141-146,2009; Yad.Fiz.72:149-154,2009
10.1134/S1063778809010165
null
hep-ph hep-th
null
Exact solutions of the Dirac--Pauli equation for massive neutrino with anomalous magnetic moment interacting with dense matter and strong electromagnetic field are found. The complete system of neutrino wavefunctions, which show spin rotation properties are obtained and their possible applications are discussed.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 16:34:59 GMT" }, { "version": "v2", "created": "Wed, 20 Feb 2008 15:23:43 GMT" } ]
2010-02-02T00:00:00
[ [ "Arbuzova", "E. V.", "" ], [ "Lobanov", "A. E.", "" ], [ "Murchikova", "E. M.", "" ] ]
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711.265
M. N. Rebelo
G. C. Branco and M. N. Rebelo
Neutrino Physics and CP violation
Presented by G. C. Branco at Cracow School of Theoretical Physics: 47th Course 2007: New Developments in Astrophysics and Astroparticle Physics, Zakopane, Poland, 14-22 Jun 2007
ActaPhys.Polon.B38:3819-3850,2007
null
null
hep-ph
null
We review some aspects of neutrino physics and CP violation both in the quark and lepton sectors.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 16:49:31 GMT" } ]
2008-11-26T00:00:00
[ [ "Branco", "G. C.", "" ], [ "Rebelo", "M. N.", "" ] ]
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711.2651
Sebastiano Sonego
Hans Westman, Sebastiano Sonego
Coordinates, observables and symmetry in relativity
37 pages
Annals of Physics 324 (2009) 1585-1611
10.1016/j.aop.2009.03.014
null
gr-qc
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We investigate the interplay and connections between symmetry properties of equations, the interpretation of coordinates, the construction of observables, and the existence of physical relativity principles in spacetime theories. Using the refined notion of an event as a ``point-coincidence'' between scalar fields that completely characterise a spacetime model, we also propose a natural generalisation of the relational local observables that does not require the existence of four everywhere invertible scalar fields. The collection of all point-coincidences forms in generic situations a four-dimensional manifold, that is naturally identified with the physical spacetime.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 16:54:06 GMT" }, { "version": "v2", "created": "Tue, 30 Jun 2009 08:49:32 GMT" } ]
2009-06-30T00:00:00
[ [ "Westman", "Hans", "" ], [ "Sonego", "Sebastiano", "" ] ]
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711.2652
Brockway McMillan
Brockway McMillan
An information-theoretic analog of a result of Perelman
null
null
null
null
math.DG cs.IT math.IT
null
Each compact manifold M of finite dimension k is differentiable and supports an intrinsic probability measure. There then exists a measurable transformation of M to the k-dimensional "surface" of the (k+1)-dimensional ball.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 22:53:00 GMT" } ]
2007-11-19T00:00:00
[ [ "McMillan", "Brockway", "" ] ]
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711.2653
Hans Westman F
Hans Westman
Non-locality, Contextuality and Transition sets
17 pages. 4 figures. Latex
null
null
null
quant-ph
null
We discuss quantum non-locality and contextuality using the notion of transition sets. This approach provides a way to obtain a direct logical contradiction with locality/non-contextuality in the EPRB gedanken experiment as well as a clear graphical illustration of what violations of Bell inequalities quantify. In particular, we show graphically how these violations are related to measures of non-local transition sets. We also introduce a new form of contextuality, {\em measurement ordering contextuality}, i.e. there exists commuting operators $\hat{\mathcal{A}}$ and $\hat{\mathcal{B}}$ such that the outcome for $\hat{\mathcal{A}}$ depends on whether we measured $\hat{\mathcal{B}}$ before or after $\hat{\mathcal{A}}$. It is shown (excluding retro-causal and/or conspiratorial theories) that any hidden variable theory capable of reproducing the quantum statistics has to have this property. This generalizes yet another feature of the hidden variable theory of deBroglie and Bohm.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 17:21:24 GMT" } ]
2007-11-19T00:00:00
[ [ "Westman", "Hans", "" ] ]
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711.2654
Maksim Kouza M
Maksim Kouza, Chin-Kun Hu and Mai Suan Li,
New force replica exchange method and protein folding pathways probed by force-clamp technique
37 pages, 1 table, 11 figures, accepted for publication in JCP
null
10.1063/1.2822272
null
q-bio.BM
null
We have developed a new extended replica exchange method to study thermodynamics of a system in the presence of external force. Our idea is based on the exchange between different force replicas to accelerate the equilibrium process. We have shown that the refolding pathways of single ubiquitin depend on which terminus is fixed. If the N-end is fixed then the folding pathways are different compared to the case when both termini are free, but fixing the C-terminal does not change them. Surprisingly, we have found that the anchoring terminal does not affect the pathways of individual secondary structures of three-domain ubiquitin, indicating the important role of the multi-domain construction. Therefore, force-clamp experiments, in which one end of a protein is kept fixed, can probe the refolding pathways of a single free-end ubiquitin if one uses either the poly-ubiquitin or a single domain with the C-terminus anchored. However, it is shown that anchoring one end does not affect refolding pathways of the titin domain I27, and the force-clamp spectroscopy is always capable to predict folding sequencing of this protein. We have obtained the reasonable estimate for unfolding barrier of ubiqutin. The linkage between residue Lys48 and the C-terminal of ubiquitin is found to have the dramatic effect on the location of the transition state along the end-to-end distance reaction coordinate, but the multi-domain construction leaves the transition state almost unchanged. We have found that the maximum force in the force-extension profile from constant velocity force pulling simulations depends on temperature nonlinearly. However, for some narrow temperature interval this dependence becomes linear, as have been observed in recent experiments.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 17:21:59 GMT" } ]
2009-11-13T00:00:00
[ [ "Kouza", "Maksim", "" ], [ "Hu", "Chin-Kun", "" ], [ "Li", "Mai Suan", "" ] ]
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711.2655
Carmelita Carbone
Carmelita Carbone, Volker Springel, Carlo Baccigalupi, Matthias Bartelmann, Sabino Matarrese
Full-sky maps for gravitational lensing of the CMB
LaTeX file, 10 pages, MNRAS in press, scales larger than the Millennium Simulation box size semi-analytically added, maps changed, references added, typos corrected
Mon.Not.Roy.Astron.Soc.388:1618,2008
10.1111/j.1365-2966.2008.13544.x
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We use the large cosmological Millennium Simulation (MS) to construct the first all-sky maps of the lensing potential and the deflection angle, aiming at gravitational lensing of the CMB, with the goal of properly including small-scale non-linearities and non-Gaussianity. Exploiting the Born approximation, we implement a map-making procedure based on direct ray-tracing through the gravitational potential of the MS. We stack the simulation box in redshift shells up to $z\sim 11$, producing continuous all-sky maps with arcminute angular resolution. A randomization scheme avoids repetition of structures along the line of sight and structures larger than the MS box size are added to supply the missing contribution of large-scale (LS) structures to the lensing signal. The angular power spectra of the projected lensing potential and the deflection-angle modulus agree quite well with semi-analytic estimates on scales down to a few arcminutes, while we find a slight excess of power on small scales, which we interpret as being due to non-linear clustering in the MS. Our map-making procedure, combined with the LS adding technique, is ideally suited for studying lensing of CMB anisotropies, for analyzing cross-correlations with foreground structures, or other secondary CMB anisotropies such as the Rees-Sciama effect.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 17:47:42 GMT" }, { "version": "v2", "created": "Tue, 17 Jun 2008 19:02:43 GMT" } ]
2008-11-26T00:00:00
[ [ "Carbone", "Carmelita", "" ], [ "Springel", "Volker", "" ], [ "Baccigalupi", "Carlo", "" ], [ "Bartelmann", "Matthias", "" ], [ "Matarrese", "Sabino", "" ] ]
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711.2656
Anisa Bajkova
Anisa T. Bajkova and Aleksandr B. Pushkarev
Structure of the Radio Source 3C 120 at 8.4 GHz from VLBA+ Observations in 2002
9 pages, 6 figures, 5 tables
Astron.Rep.52:12-18,2008; Astron.Zh.85:15-22,2008
10.1134/S1063772908010022
null
astro-ph
null
Maps of the radio source 3C 120 obtained from VLBA+ observations at 8.4 GHz at five epochs in January - September 2002 are presented. The images were reconstructed using the maximum entropy method and the Pulkovo VLBImager software package for VLBI mapping. Apparent superluminal motions of the brightest jet knots have been estimated. The speeds of jet knots decreases with distance from the core, changing from 5.40+-0.48c $ to 2.00+-0.48c over 10 mas (where c is the speed of light) for a Hubble constant of 65 km/s/Mpc. This can be explained by interaction of the jet with the medium through which it propagates.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 17:57:33 GMT" } ]
2008-11-26T00:00:00
[ [ "Bajkova", "Anisa T.", "" ], [ "Pushkarev", "Aleksandr B.", "" ] ]
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711.2657
Stewart Sherrit
Stewart Sherrit, Binu K. Mukherjee
Characterization of Piezoelectric Materials for Transducers
45 pgs, 22 figures
Dielectric and Ferroelectric Reviews, 2012:175-244, Editors: Srowthi S. N. Bharadwaja and Robert A. Dorey
null
CL#07-1466
cond-mat.mtrl-sci cond-mat.soft
null
Review of techniques for characterizing piezoelectric/electrostrictive material for transducer applications.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 17:15:27 GMT" } ]
2022-02-07T00:00:00
[ [ "Sherrit", "Stewart", "" ], [ "Mukherjee", "Binu K.", "" ] ]
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711.2658
Christopher Ferrie
Christopher Ferrie and Joseph Emerson
Frame representations of quantum mechanics and the necessity of negativity in quasi-probability representations
13 pages, published version
J. Phys. A: Math. Theor. 41 352001 (2008)
10.1088/1751-8113/41/35/352001
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Several finite dimensional quasi-probability representations of quantum states have been proposed to study various problems in quantum information theory and quantum foundations. These representations are often defined only on restricted dimensions and their physical significance in contexts such as drawing quantum-classical comparisons is limited by the non-uniqueness of the particular representation. Here we show how the mathematical theory of frames provides a unified formalism which accommodates all known quasi-probability representations of finite dimensional quantum systems. Moreover, we show that any quasi-probability representation satisfying two reasonable properties is equivalent to a frame representation and then prove that any such representation of quantum mechanics must exhibit either negativity or a deformed probability calculus.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 18:24:53 GMT" }, { "version": "v2", "created": "Mon, 26 Nov 2007 20:24:20 GMT" }, { "version": "v3", "created": "Thu, 7 Aug 2008 02:08:12 GMT" } ]
2008-08-07T00:00:00
[ [ "Ferrie", "Christopher", "" ], [ "Emerson", "Joseph", "" ] ]
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711.2659
Dario Zappala
Paolo Castorina, Dario Zappal\`a
Spontaneous breaking of translational invariance in non-commutative lambda phi^4 theory in two dimensions
7 pages, 2 figures
Phys.Rev.D77:027703,2008
10.1103/PhysRevD.77.027703
null
hep-th
null
The spontaneous breaking of of translational invariance in non-commutative self-interacting scalar field theory in two dimensions is investigated by effective action techniques. The analysis confirms the existence of the stripe phase, already observed in lattice simulations, due to the non-local nature of the non-commutative dynamics.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 18:25:11 GMT" } ]
2008-11-26T00:00:00
[ [ "Castorina", "Paolo", "" ], [ "Zappalà", "Dario", "" ] ]
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711.266
Steven R. Blusk
Steven R. Blusk
Leptonic D and D_s Decays near c-cbar Threshold
6 pages, 6 figures, To be published in the proceedings of CHARM07, Ithaca, NY, August 5-8, 2007, eConf C070805
ECONF C070805:30,2007
null
null
hep-ex
null
We present recent results from the CLEO Collaboration on leptonic decay rates of $D$ and $D_s$ near $c\bar{c}$ production threshold. From these decay rates, we extract the decay constants, f_D = (222.6+-16.7^{+2.8}_{-3.4}) MeV, f_Ds = (274+-10+-5) MeV, and the ratio f_Ds/f_D = 1.23+-0.11+-0.03.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 18:27:25 GMT" } ]
2011-06-15T00:00:00
[ [ "Blusk", "Steven R.", "" ] ]
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711.2661
Florian Marquardt
Max Ludwig, Clemens Neuenhahn, Constanze Metzger, Alexander Ortlieb, Ivan Favero, Khaled Karrai, Florian Marquardt
Self-induced oscillations in an optomechanical system
4.5 pages, 3 figures (v2: corrected few typos)
null
10.1103/PhysRevLett.101.133903
null
cond-mat.mes-hall
null
We have explored the nonlinear dynamics of an optomechanical system consisting of an illuminated Fabry-Perot cavity, one of whose end-mirrors is attached to a vibrating cantilever. Such a system can experience negative light-induced damping and enter a regime of self-induced oscillations. We present a systematic experimental and theoretical study of the ensuing attractor diagram describing the nonlinear dynamics, in an experimental setup where the oscillation amplitude becomes large, and the mirror motion is influenced by several optical modes. A theory has been developed that yields detailed quantitative agreement with experimental results. This includes the observation of a regime where two mechanical modes of the cantilever are excited simultaneously.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 18:31:05 GMT" }, { "version": "v2", "created": "Sat, 17 Nov 2007 15:50:52 GMT" } ]
2013-05-29T00:00:00
[ [ "Ludwig", "Max", "" ], [ "Neuenhahn", "Clemens", "" ], [ "Metzger", "Constanze", "" ], [ "Ortlieb", "Alexander", "" ], [ "Favero", "Ivan", "" ], [ "Karrai", "Khaled", "" ], [ "Marquardt", "Florian", "" ] ]
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711.2662
S. M. Iftiquar Dr
S. M. Iftiquar
Electromagnetically induced transparency at high optical power
3 pages, five figures
XXXIII Opt. Soc. India Symposium on Optics and optoelectronics (2007)
null
Paper code: OSI_XXXIII/P-06, Dec. (2007) Tezpur, Assam, India
physics.atom-ph physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We observe electromagnetically induced transparency (EIT) in Rb vapor at various optical intensities, starting from below saturation to several times the saturation intensity. The observed Lorentzian width of the EIT signal is very small. Solving the time dependant density matrix equation of motion with a phenomenological decay constant, we find an expression suitable in explaining the EIT signal. In this experimental observation and theoretical analysis intensity of EIT signal and its Lorentzian width increases with Rabi frequency of optical field.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 18:33:38 GMT" }, { "version": "v2", "created": "Thu, 20 Jan 2011 06:51:26 GMT" } ]
2011-01-21T00:00:00
[ [ "Iftiquar", "S. M.", "" ] ]
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711.2663
S. M. Iftiquar Dr
S. M. Iftiquar
Wide range and highly sensitive atomic magnetometry with Rb vapor
3 pages, 4 figures
XXXIII Opt. Soc. India Symposium on Optics and optoelectronics (2007)
null
Paper code: OSI_XXXIII/P-07, Dec. (2007) Tezpur, Assam, India
physics.atom-ph physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We have developed a technique in which Rb atomic response to weak magnetic field is high and an efficient rotation of linearly polarized laser beam results in efficient magnetometry. 85Rb isotope has been used for the magnetometry in an ordinary vapor cell without any paraffin coating to its inner wall. A linear regime of Faraday rotation of about 25 microT has been observed with atomic number density within the vapor cell of about 10^9 cm-3.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 18:39:32 GMT" }, { "version": "v2", "created": "Thu, 20 Jan 2011 06:47:58 GMT" } ]
2011-01-21T00:00:00
[ [ "Iftiquar", "S. M.", "" ] ]
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711.2664
Thomas D. Cohen
Thomas D. Cohen
Response to D.T. Son's comment on ``Is there a `most perfect fluid' consistent with quantum field theory?''
1 page. This is a brief response to arXiv:0709.4651
null
null
null
hep-th
null
This is a response to the comment, arXiv:0709.4651. It is noted that while the comment raises an extremely interesting and subtle point, the original conclusion that theoretically consistent exceptions exist for the proposed general bound for the ratio of shear viscosity to entropy density, appears to remain unaffected by the issue raised.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 18:43:35 GMT" } ]
2007-11-19T00:00:00
[ [ "Cohen", "Thomas D.", "" ] ]
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711.2665
Maria Fyta
Maria Fyta, Jayanta Sircar, Efthimios Kaxiras, Simone Melchionna, Massimo Bernaschi, and Sauro Succi
Parallel multiscale modeling of biopolymer dynamics with hydrodynamic correlations
10 pages, 5 figures, 3 tables. to appear in International Journal for Multiscale Computational Engineering
vol. 6, issue 1 (2008)
null
null
physics.comp-ph physics.bio-ph
null
We employ a multiscale approach to model the translocation of biopolymers through nanometer size pores. Our computational scheme combines microscopic Molecular Dynamics (MD) with a mesoscopic Lattice Boltzmann (LB) method for the solvent dynamics, explicitly taking into account the interactions of the molecule with the surrounding fluid. We describe an efficient parallel implementation of the method which exhibits excellent scalability on the Blue Gene platform. We investigate both dynamical and statistical aspects of the translocation process by simulating polymers of various initial configurations and lengths. For a representative molecule size, we explore the effects of important parameters that enter in the simulation, paying particular attention to the strength of the molecule-solvent coupling and of the external electric field which drives the translocation process. Finally, we explore the connection between the generic polymers modeled in the simulation and DNA, for which interesting recent experimental results are available.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 18:43:52 GMT" } ]
2008-02-27T00:00:00
[ [ "Fyta", "Maria", "" ], [ "Sircar", "Jayanta", "" ], [ "Kaxiras", "Efthimios", "" ], [ "Melchionna", "Simone", "" ], [ "Bernaschi", "Massimo", "" ], [ "Succi", "Sauro", "" ] ]
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711.2666
Matthew Harrison
Matthew T. Harrison
The Generalized Asymptotic Equipartition Property: Necessary and Sufficient Conditions
19 pages
IEEE Transactions on Information Theory, (2008) 54: 3211-3216
10.1109/TIT.2008.924668
null
cs.IT math.IT
null
Suppose a string $X_1^n=(X_1,X_2,...,X_n)$ generated by a memoryless source $(X_n)_{n\geq 1}$ with distribution $P$ is to be compressed with distortion no greater than $D\geq 0$, using a memoryless random codebook with distribution $Q$. The compression performance is determined by the ``generalized asymptotic equipartition property'' (AEP), which states that the probability of finding a $D$-close match between $X_1^n$ and any given codeword $Y_1^n$, is approximately $2^{-n R(P,Q,D)}$, where the rate function $R(P,Q,D)$ can be expressed as an infimum of relative entropies. The main purpose here is to remove various restrictive assumptions on the validity of this result that have appeared in the recent literature. Necessary and sufficient conditions for the generalized AEP are provided in the general setting of abstract alphabets and unbounded distortion measures. All possible distortion levels $D\geq 0$ are considered; the source $(X_n)_{n\geq 1}$ can be stationary and ergodic; and the codebook distribution can have memory. Moreover, the behavior of the matching probability is precisely characterized, even when the generalized AEP is not valid. Natural characterizations of the rate function $R(P,Q,D)$ are established under equally general conditions.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 18:58:45 GMT" } ]
2013-01-18T00:00:00
[ [ "Harrison", "Matthew T.", "" ] ]
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711.2667
Michele Vallisneri
Stanislav Babak, John G. Baker, Matthew J. Benacquista, Neil J. Cornish, Jeff Crowder, Curt Cutler, Shane L. Larson, Tyson B. Littenberg, Edward K. Porter, Michele Vallisneri, Alberto Vecchio (the Mock LISA Data Challenge task force) and Gerard Auger, Leor Barack, Arkadiusz Blaut, Ed Bloomer, Duncan A. Brown, Nelson Christensen, James Clark, Stephen Fairhurst, Jonathan R. Gair, Hubert Halloin, Martin Hendry, Arturo Jimenez, Andrzej Krolak, Ilya Mandel, Chris Messenger, Renate Meyer, Soumya Mohanty, Rajesh Nayak, Antoine Petiteau, Matt Pitkin, Eric Plagnol, Reinhard Prix, Emma L. Robinson, Christian Roever, Pavlin Savov, Alexander Stroeer, Jennifer Toher, John Veitch, Jean-Yves Vinet, Linqing Wen, John T. Whelan, Graham Woan (the Challenge 2 participants)
Report on the second Mock LISA Data Challenge
8 pages, 2 EPS figures, proceedings of the 7th Amaldi Conference on Gravitational Waves, 8-14 July 2007, Sydney, Australia
Class.Quant.Grav.25:114037,2008
10.1088/0264-9381/25/11/114037
null
gr-qc
null
The Mock LISA Data Challenges are a program to demonstrate LISA data-analysis capabilities and to encourage their development. Each round of challenges consists of several data sets containing simulated instrument noise and gravitational-wave sources of undisclosed parameters. Participants are asked to analyze the data sets and report the maximum information about source parameters. The challenges are being released in rounds of increasing complexity and realism: in this proceeding we present the results of Challenge 2, issued in January 2007, which successfully demonstrated the recovery of signals from supermassive black-hole binaries, from ~20,000 overlapping Galactic white-dwarf binaries, and from the extreme-mass-ratio inspirals of compact objects into central galactic black holes.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 19:05:11 GMT" } ]
2008-11-26T00:00:00
[ [ "Babak", "Stanislav", "", "the Mock LISA Data\n Challenge task force" ], [ "Baker", "John G.", "", "the Mock LISA Data\n Challenge task force" ], [ "Benacquista", "Matthew J.", "", "the Mock LISA Data\n Challenge task force" ], [ "Cornish", "Neil J.", "", "the Mock LISA Data\n Challenge task force" ], [ "Crowder", "Jeff", "", "the Mock LISA Data\n Challenge task force" ], [ "Cutler", "Curt", "", "the Mock LISA Data\n Challenge task force" ], [ "Larson", "Shane L.", "", "the Mock LISA Data\n Challenge task force" ], [ "Littenberg", "Tyson B.", "", "the Mock LISA Data\n Challenge task force" ], [ "Porter", "Edward K.", "", "the Mock LISA Data\n Challenge task force" ], [ "Vallisneri", "Michele", "", "the Mock LISA Data\n Challenge task force" ], [ "Vecchio", "Alberto", "", "the Mock LISA Data\n Challenge task force" ], [ "Auger", "Gerard", "", "the\n Challenge 2 participants" ], [ "Barack", "Leor", "", "the\n Challenge 2 participants" ], [ "Blaut", "Arkadiusz", "", "the\n Challenge 2 participants" ], [ "Bloomer", "Ed", "", "the\n Challenge 2 participants" ], [ "Brown", "Duncan A.", "", "the\n Challenge 2 participants" ], [ "Christensen", "Nelson", "", "the\n Challenge 2 participants" ], [ "Clark", "James", "", "the\n Challenge 2 participants" ], [ "Fairhurst", "Stephen", "", "the\n Challenge 2 participants" ], [ "Gair", "Jonathan R.", "", "the\n Challenge 2 participants" ], [ "Halloin", "Hubert", "", "the\n Challenge 2 participants" ], [ "Hendry", "Martin", "", "the\n Challenge 2 participants" ], [ "Jimenez", "Arturo", "", "the\n Challenge 2 participants" ], [ "Krolak", "Andrzej", "", "the\n Challenge 2 participants" ], [ "Mandel", "Ilya", "", "the\n Challenge 2 participants" ], [ "Messenger", "Chris", "", "the\n Challenge 2 participants" ], [ "Meyer", "Renate", "", "the\n Challenge 2 participants" ], [ "Mohanty", "Soumya", "", "the\n Challenge 2 participants" ], [ "Nayak", "Rajesh", "", "the\n Challenge 2 participants" ], [ "Petiteau", "Antoine", "", "the\n Challenge 2 participants" ], [ "Pitkin", "Matt", "", "the\n Challenge 2 participants" ], [ "Plagnol", "Eric", "", "the\n Challenge 2 participants" ], [ "Prix", "Reinhard", "", "the\n Challenge 2 participants" ], [ "Robinson", "Emma L.", "", "the\n Challenge 2 participants" ], [ "Roever", "Christian", "", "the\n Challenge 2 participants" ], [ "Savov", "Pavlin", "", "the\n Challenge 2 participants" ], [ "Stroeer", "Alexander", "", "the\n Challenge 2 participants" ], [ "Toher", "Jennifer", "", "the\n Challenge 2 participants" ], [ "Veitch", "John", "", "the\n Challenge 2 participants" ], [ "Vinet", "Jean-Yves", "", "the\n Challenge 2 participants" ], [ "Wen", "Linqing", "", "the\n Challenge 2 participants" ], [ "Whelan", "John T.", "", "the\n Challenge 2 participants" ], [ "Woan", "Graham", "", "the\n Challenge 2 participants" ] ]
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711.2668
Markus Mueller
Markus Mueller and Lev B. Ioffe
Collective modes in quantum electron glasses and electron-assisted hopping
null
null
null
null
cond-mat.str-el cond-mat.dis-nn
null
We study electronic transport in Anderson insulators with strong Coulomb interactions in dimensions d>=2. Close to the metal insulator transition where the single particle localization length is much larger than interparticle-distance, the interactions lead to a strongly correlated quantum glass phase. Even though single particle excitations are localized and the system is insulating, there are collective electronic modes which remain delocalized down to parametrically small energies. These collective excitations serve as a continuous bath which can provide the activation energy for variable range hopping transport. This circumvents the energy conservation problem arising when only discrete particle-hole excitations are present. In contrast to the weak and material-dependent phonon-assisted hopping mechanism, the activation by an electronic bath leads to a nearly universal prefactor e^2/h of the Efros-Shklovskii conductance, as is observed in many recent experiments.
[ { "version": "v1", "created": "Sat, 17 Nov 2007 03:09:21 GMT" } ]
2007-11-19T00:00:00
[ [ "Mueller", "Markus", "" ], [ "Ioffe", "Lev B.", "" ] ]
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711.2669
Otmar Venjakob
Peter Schneider and Otmar Venjakob
Localisations and Completions of Skew Power Series Rings
26 pages
Am. J. Math. 132, No. 1, 1-36 (2010)
null
null
math.RA math.NT
null
This paper is a natural continuation of the study of skew power series rings A initiated in [P. Schneider and O. Venjakob, On the codimension of modules over skew power series rings with applications to Iwasawa algebras, J. Pure Appl. Algebra 204 (2005), 349 - 367.]. We construct skew Laurent series rings B and show the existence of some canonical Ore sets S for the skew power series rings A such that a certain completion of the localisation A_S is isomorphic to B. This is applied to certain Iwasawa algebras. Finally we introduce subrings of overconvergent skew Laurent series rings.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 19:51:35 GMT" } ]
2010-06-09T00:00:00
[ [ "Schneider", "Peter", "" ], [ "Venjakob", "Otmar", "" ] ]
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711.267
Attila Szallas
Attila Szallas, Anuradha Jagannathan
Spin waves and local magnetizations on the Penrose tiling
14 pages, 21 figures
Phys. Rev. B 77, 104427 (2008)
10.1103/PhysRevB.77.104427
null
cond-mat.str-el
null
We consider a Heisenberg antiferromagnet on the Penrose tiling, a quasiperiodic system having an inhomogeneous Neel-ordered ground state. Spin wave energies and wavefunctions are studied in the linear spin wave approximation. A linear dispersion law is found at low energies, as in other bipartite antiferromagnets, with an effective spin wave velocity lower than in the square lattice. Spatial properties of eigenmodes are characterized in several different ways. At low energies, eigenstates are relatively extended, and show multifractal scaling. At higher energies, states are more localized, and, depending on the energy, confined to sites of a specified coordination number. The ground state energy of this antiferromagnet, and local staggered magnetizations are calculated. Perpendicular space projections are presented in order to show the underlying simplicity of this "complex" ground state. A simple analytical model, the two-tier Heisenberg star, is presented to explain the staggered magnetization distribution in this antiferromagnetic system.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 19:46:48 GMT" }, { "version": "v2", "created": "Fri, 29 Feb 2008 15:20:31 GMT" }, { "version": "v3", "created": "Tue, 1 Apr 2008 17:09:35 GMT" } ]
2008-04-01T00:00:00
[ [ "Szallas", "Attila", "" ], [ "Jagannathan", "Anuradha", "" ] ]
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711.2671
Himanshu Thapliyal
Himanshu Thapliyal, Hamid R. Arabnia, Rajnish Bajpai, Kamal K. Sharma
Combined Integer and Variable Precision (CIVP) Floating Point Multiplication Architecture for FPGAs
Published in Proceedings of the 2007 International Conference on Parallel and Distributed Processing Techniques and Applications (PDPTA'07), Las Vegas, U.S.A, June 2007, Volume 1, pp. 449-450.(CSREA Press)
null
null
null
cs.AR
null
In this paper, we propose an architecture/methodology for making FPGAs suitable for integer as well as variable precision floating point multiplication. The proposed work will of great importance in applications which requires variable precision floating point multiplication such as multi-media processing applications. In the proposed architecture/methodology, we propose the replacement of existing 18x18 bit and 25x18 bit dedicated multipliers in FPGAs with dedicated 24x24 bit and 24x9 bit multipliers, respectively. We have proved that our approach of providing the dedicated 24x24 bit and 24x9 bit multipliers in FPGAs will make them efficient for performing integer as well as single precision, double precision, and Quadruple precision floating point multiplications.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 20:18:32 GMT" } ]
2007-11-19T00:00:00
[ [ "Thapliyal", "Himanshu", "" ], [ "Arabnia", "Hamid R.", "" ], [ "Bajpai", "Rajnish", "" ], [ "Sharma", "Kamal K.", "" ] ]
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711.2672
Krzysztof Bara\'nski
Krzysztof Bara\'nski, Bogus{\l}awa Karpi\'nska and Anna Zdunik
Hyperbolic dimension of Julia sets of meromorphic maps with logarithmic tracts
7 pages, 1 figure
Internat. Math. Res. Notices 2009 (2009), 615-624
10.1093/imrn/rnn141
null
math.DS
null
We prove that for meromorphic maps with logarithmic tracts (e.g. entire or meromorphic maps with a finite number of poles from class $\mathcal B$), the Julia set contains a compact invariant hyperbolic Cantor set of Hausdorff dimension greater than 1. Hence, the hyperbolic dimension of the Julia set is greater than 1.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 20:16:54 GMT" } ]
2011-05-26T00:00:00
[ [ "Barański", "Krzysztof", "" ], [ "Karpińska", "Bogusława", "" ], [ "Zdunik", "Anna", "" ] ]
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711.2673
Patrick Gilmer
Patrick M. Gilmer
Remarks on Congruence of 3-manifolds
4 pages, to appear in JKTR
J. Knot Theory and its Ramif. 16, (2007), 1357 -- 1360
10.1142/S021821650700583X
null
math.GT
null
We give two proofs that the 3-torus is not weakly d-congruent to the connected sum of three S^1xS^2's, if d>2. We study how cohomology ring structure relates to weak congruence. We give an example of three 3--manifolds which are weakly 5-congruent but are not 5-congruent.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 20:27:14 GMT" } ]
2015-10-28T00:00:00
[ [ "Gilmer", "Patrick M.", "" ] ]
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711.2674
Himanshu Thapliyal
Himanshu Thapliyal, Hamid R. Arabnia, Rajnish Bajpai, Kamal K. Sharma
Partial Reversible Gates(PRG) for Reversible BCD Arithmetic
Published in Proceedings of the 2007 International Conference on Computer Design(CDES'07), Las Vegas, U.S.A, June 2007, pp. 90-91(CSREA Press)
null
null
null
cs.AR
null
IEEE 754r is the ongoing revision to the IEEE 754 floating point standard and a major enhancement to the standard is the addition of decimal format. Furthermore, in the recent years reversible logic has emerged as a promising computing paradigm having its applications in low power CMOS, quantum computing, nanotechnology, and optical computing. The major goal in reversible logic is to minimize the number of reversible gates and garbage outputs. Thus, this paper proposes the novel concept of partial reversible gates that will satisfy the reversibility criteria for specific cases in BCD arithmetic. The partial reversible gate is proposed to minimize the number of reversible gates and garbage outputs, while designing the reversible BCD arithmetic circuits.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 20:25:20 GMT" } ]
2007-11-19T00:00:00
[ [ "Thapliyal", "Himanshu", "" ], [ "Arabnia", "Hamid R.", "" ], [ "Bajpai", "Rajnish", "" ], [ "Sharma", "Kamal K.", "" ] ]
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711.2675
Stanislav Volkov
Stanislav Volkov, Timothy Wong
A note on random walks in a hypercube
null
null
null
null
math.PR math.CO
null
We study a simple random walk on an n-dimensional hypercube. For any starting position we find the probability of hitting vertex a before hitting vertex b, whenever a and b share the same edge. This generalizes the model in Doyle, P., and Snell, J., "Random Walks and Electric Networks", Mathematical Association of America, 1984 (see Exercise 1.3.7 there).
[ { "version": "v1", "created": "Fri, 16 Nov 2007 20:31:22 GMT" } ]
2007-11-19T00:00:00
[ [ "Volkov", "Stanislav", "" ], [ "Wong", "Timothy", "" ] ]
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711.2676
Petr Zasche
P. Zasche
New Systems Showing the Light-Time Effect
4 pages, 2 figures, 2 tables, conference proceedings
2006ASPC..349..379Z
null
null
astro-ph
null
Two Algol-type eclipsing binary systems (EW Lyr and IV Cas) have been investigated for period changes. Our study was primarily focused on the light-time effect with an alternative explanation by magnetic activity cycles. In the case of EW Lyr we have found a third body in the orbit with a period of about 78 years, an amplitude A=0.052 days and orbital eccentricity e=0.57. For IV Cas the long period is 58 years, amplitude A=0.034 days and zero eccentricity. With these results we are also able to calculate mass functions and minimal masses of these components.
[ { "version": "v1", "created": "Sun, 18 Nov 2007 21:58:17 GMT" } ]
2007-11-20T00:00:00
[ [ "Zasche", "P.", "" ] ]
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711.2677
David E. Speyer
David E Speyer
Uniformizing Tropical Curves I: Genus Zero and One
null
Algebra Number Theory 8 (2014) 963-998
10.2140/ant.2014.8.963
null
math.AG
null
In tropical geometry, given a curve in a toric variety, one defines a corresponding graph embedded in Euclidean space. We study the problem of reversing this process for curves of genus zero and one. Our methods focus on describing curves by parameterizations, not by their defining equations; we give parameterizations by rational functions in the genus zero case and by non-archimedean elliptic functions in the genus one case. For genus zero curves, those graphs which can be lifted can be characterized in a completely combinatorial manner. For genus one curves, show that certain conditions identified by Mikhalkin are sufficient and we also identify a new necessary condition.
[ { "version": "v1", "created": "Sun, 18 Nov 2007 22:05:05 GMT" } ]
2016-01-20T00:00:00
[ [ "Speyer", "David E", "" ] ]
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711.2678
Andrei Alexandru
Andrei Alexandru, Anyi Li, Keh-Fei Liu
Finite density simulations using a determinant estimator
7 pages, 4 figures, Contribution to Lattice 2007, Regensburg, Germany, 30 July - 4 August 2007
PoSLAT2007:167,2007
null
null
hep-lat
null
Previous investigations have shown that the canonical approach to simulating QCD at finite density is promising. The algorithm we used in our earlier work employs an exact calculation of the fermionic determinant which limits the size of the lattices we can simulate. Interesting questions can only be answered if we simulate at larger volume. In this paper we explore an algorithm, Hybrid Noisy Monte Carlo, that employs a determinant estimator rather than an exact calculation. We first present the technical aspects of the estimator, check that the algorithm is correct by comparing it with our previous study, and then discuss its merits. We will also discuss the challenges faced when simulating larger lattice volumes.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 21:53:16 GMT" } ]
2008-11-26T00:00:00
[ [ "Alexandru", "Andrei", "" ], [ "Li", "Anyi", "" ], [ "Liu", "Keh-Fei", "" ] ]
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711.2679
Tianjun Li
Ching-Ming Chen, Tianjun Li, Yan Liu, Dimitri V. Nanopoulos
Realistic Type IIB Supersymmetric Minkowski Flux Vacua
RevTex4, 4 pages, 3 tables
Phys.Lett.B668:63-66,2008
10.1016/j.physletb.2008.08.010
ACT-07-07, MIFP-07-30
hep-th astro-ph hep-ph
null
We show that there exist supersymmetric Minkowski vacua on Type IIB toroidal orientifold with general flux compactifications where the RR tadpole cancellation conditions can be relaxed elegantly. Then we present a realistic Pati-Salam like model. At the string scale, the gauge symmetry can be broken down to the Standard Model (SM) gauge symmetry, the gauge coupling unification can be achieved naturally, and all the extra chiral exotic particles can be decoupled so that we have the supersymmetric SMs with/without SM singlet(s) below the string scale. The observed SM fermion masses and mixings can also be obtained. In addition, the unified gauge coupling, the dilaton, the complex structure moduli, the real parts of the K\"ahler moduli and the sum of the imaginary parts of the K\"ahler moduli can be determined as functions of the four-dimensional dilaton and fluxes, and can be estimated as well.
[ { "version": "v1", "created": "Sun, 18 Nov 2007 09:23:15 GMT" } ]
2008-11-26T00:00:00
[ [ "Chen", "Ching-Ming", "" ], [ "Li", "Tianjun", "" ], [ "Liu", "Yan", "" ], [ "Nanopoulos", "Dimitri V.", "" ] ]
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711.268
Joanna L. Karczmarek
Joanna L. Karczmarek
Quantum behaviour near a spacelike boundary in the c=1 matrix model
21 pages, 2 figures, minor corrections
Phys.Rev.D78:026003,2008
10.1103/PhysRevD.78.026003
null
hep-th
null
Certain time dependent configurations in the c=1 matrix model correspond to string theory backgrounds which have spacelike boundaries and appear geodesically incomplete. We investigate quantum mechanical properties of a class of such configurations in the matrix model, in terms of fermionic eigenvalues. We describe Hamiltonian evolution of the eigenvalue density using several different time variables, some of which are infinite and some of which are finite in extent. We derive unitary transformations relating these different descriptions, and use those to calculate fermion correlators in the time dependent background. Using the chiral formalism, we write the time dependent configurations as a state in the original matrix model Hilbert space.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 18:19:29 GMT" }, { "version": "v2", "created": "Sun, 30 Mar 2008 23:20:08 GMT" } ]
2008-11-07T00:00:00
[ [ "Karczmarek", "Joanna L.", "" ] ]
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711.2681
Sigfrid Yngvesson
K. Fu, R. Zannoni, C. Chan, S. Adams, J. Nicholson, E. Polizzi and S. Yngvesson
Terahertz detection in single wall carbon nanotubes
9 pages
null
10.1063/1.2837188
null
cond-mat.mes-hall
null
It is reported that terahertz radiation from 0.69 THz to 2.54 THz has been sensitively detected in a device consisting of bundles of metallic carbon nanotubes, quasi-optically coupled through a lithographically fabricated antenna, and a silicon lens. The measured data are consistent with a bolometric process and show promise for operation above 4.2 K.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 21:15:58 GMT" } ]
2009-11-13T00:00:00
[ [ "Fu", "K.", "" ], [ "Zannoni", "R.", "" ], [ "Chan", "C.", "" ], [ "Adams", "S.", "" ], [ "Nicholson", "J.", "" ], [ "Polizzi", "E.", "" ], [ "Yngvesson", "S.", "" ] ]
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711.2682
J. Robert Buchler
J. Robert Buchler
Beat Cepheids as Probes of Stellar and Galactic Metallicity: The New AGS Abundances
6 pages, 5 figures revised version (minor changes)
null
10.1086/588547
null
astro-ph
null
It is well known that the mere location of a Beat Cepheid model in a Period Ratio \vs Period diagram (Petersen diagram) puts constraints on its metallicity Z. But these bounds are sensitive to the mixture of elements that are lumped into the parameter $Z$. In this short paper we update the previous results that were based on the Grevesse-Noels solar mixture to the recent, revised Asplund, Grevesse & Sauval (2005) (AGS) solar mixture. We also examine the effect of the envelope depth on the accuracy of the computed pulsation periods. We find that for low period Cepheids with high Z the customary approximation of envelope pulsation breaks down. It is necessary to compute stellar models that extend to the center and to include burning and composition inhomogeneities in the modeling. Fortunately, however, most Beat Cepheids that have been observed so far seem to avoid that regime.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 21:33:14 GMT" }, { "version": "v2", "created": "Mon, 24 Mar 2008 15:56:54 GMT" } ]
2009-11-13T00:00:00
[ [ "Buchler", "J. Robert", "" ] ]
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711.2683
Teresa Montaruli
The ANTARES Collaboration
ANTARES Collaboration Proceedings of ICRC 2007
HTML file with clickable links to papers
null
null
null
astro-ph
null
Contributions to ICRC 2007, Merida, Mexico. Contents pages for the Contribution on behalf of the ANTARES Collaboration to the 30th ICRC that took place in July 2007 in Merida, Mexico. The contents are in html form with clickable links to the papers that exist on the Astrophysics archive.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 21:37:08 GMT" } ]
2012-08-27T00:00:00
[ [ "The ANTARES Collaboration", "", "" ] ]
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711.2684
David Callan
David Callan
Bijections from Dyck paths to 321-avoiding permutations revisited
15 pages, LaTeX
null
null
null
math.CO
null
There are (at least) three bijections from Dyck paths to 321-avoiding permutations in the literature, due to Billey-Jockusch-Stanley, Krattenthaler, and Mansour-Deng-Du. How different are they? Denoting them B,K,M respectively, we show that M = B \circ L = K \circ L' where L is the classical Kreweras-Lalanne involution on Dyck paths and L', also an involution, is a sort of derivative of L. Thus K^{-1} \circ B, a measure of the difference between B and K, is the product of involutions L' \circ L and turns out to be a very curious bijection: as a permutation on Dyck n-paths it is an nth root of the "reverse path" involution. The proof of this fact boils down to a geometric argument involving pairs of nonintersecting lattice paths.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 21:42:31 GMT" } ]
2007-11-20T00:00:00
[ [ "Callan", "David", "" ] ]
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711.2685
Duilia de Mello F
Duilia F. de Mello, L. J. Smith, E. Sabbi, J.S. Gallagher, M. Mountain, D.R. Harbeck
Star-formation in the HI bridge between M81 and M82
Astronomical Journal accepted
null
10.1088/0004-6256/135/2/548
null
astro-ph
null
We present multi-wavelength observations of stellar features in the HI tidal bridge connecting M81 and M82 in the region called Arp's Loop. We identify eight young star-forming regions from Galaxy Evolution Explorer ultraviolet observations. Four of these objects are also detected at H\alpha. We determine the basic star formation history of Arp's Loop using F475W and F814W images obtained with the Advanced Camera for Surveys on board the Hubble Space Telescope. We find both a young (< 10 Myr) and an old (>1 Gyr) stellar population with a similar spatial distribution and a metallicity Z~0.004. We suggest that the old stellar population was formed in the stellar disk of M82 and/or M81 and ejected into the intergalactic medium during a tidal passage (~ 200-300 Myr ago), whereas the young UV-bright stars have formed in the tidal debris. The UV luminosities of the eight objects are modest and typical of small clusters or OB associations. The tidal bridge between M81-M82 therefore appears to be intermediate between the very low levels of star formation seen in the Magellanic bridge and actively star-forming tidal tails associated with major galaxy mergers.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 21:58:49 GMT" } ]
2009-11-13T00:00:00
[ [ "de Mello", "Duilia F.", "" ], [ "Smith", "L. J.", "" ], [ "Sabbi", "E.", "" ], [ "Gallagher", "J. S.", "" ], [ "Mountain", "M.", "" ], [ "Harbeck", "D. R.", "" ] ]
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711.2686
Saulo Carneiro
S. Carneiro, M. A. Dantas, C. Pigozzo, J. S. Alcaniz
Observational constraints on late-time Lambda(t) cosmology
Some important revisions. To appear in Physical Review D
Phys.Rev.D77:083504,2008
10.1103/PhysRevD.77.083504
null
astro-ph gr-qc hep-th
null
The cosmological constant, i.e., the energy density stored in the true vacuum state of all existing fields in the Universe, is the simplest and the most natural possibility to describe the current cosmic acceleration. However, despite its observational successes, such a possibility exacerbates the well known cosmological constant problem, requiring a natural explanation for its small, but nonzero, value. In this paper we study cosmological consequences of a scenario driven by a varying cosmological term, in which the vacuum energy density decays linearly with the Hubble parameter. We test the viability of this scenario and study a possible way to distinguish it from the current standard cosmological model by using recent observations of type Ia supernova (Supernova Legacy Survey Collaboration), measurements of the baryonic acoustic oscillation from the Sloan Digital Sky Survey and the position of the first peak of the cosmic microwave background angular spectrum from the three-year Wilkinson Microwave Anisotropy Probe.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 22:28:40 GMT" }, { "version": "v2", "created": "Tue, 12 Feb 2008 13:53:54 GMT" } ]
2008-11-26T00:00:00
[ [ "Carneiro", "S.", "" ], [ "Dantas", "M. A.", "" ], [ "Pigozzo", "C.", "" ], [ "Alcaniz", "J. S.", "" ] ]
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711.2687
Steffen Waldherr
Steffen Waldherr and Frank Allgower
A feedback approach to bifurcation analysis in biochemical networks with many parameters
null
In Proceedings of the 2nd Foundations of Systems Biology in Engineering (FOSBE) 2007, pp. 479-484, Fraunhofer IRB Verlag Stuttgart, ISBN 978-3-8167-7436-5
null
null
q-bio.MN
null
Feedback circuits in biochemical networks which underly cellular signaling pathways are important elements in creating complex behavior. A specific aspect thereof is how stability of equilibrium points depends on model parameters. For biochemical networks, which are modelled using many parameters, it is typically very difficult to estimate the influence of parameters on stability. Finding parameters which result in a change in stability is a key step for a meaningful bifurcation analysis. We describe a method based on well known approaches from control theory, which can locate parameters leading to a change in stability. The method considers a feedback circuit in the biochemical network and relates stability properties to the control system obtained by loop--breaking. The method is applied to a model of a MAPK cascade as an illustrative example.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 22:11:36 GMT" } ]
2007-11-20T00:00:00
[ [ "Waldherr", "Steffen", "" ], [ "Allgower", "Frank", "" ] ]
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711.2688
Henry A. (Chip) Kobulnicky
Henry A. Kobulnicky (University of Wyoming) and Evan. D. Skillman (University of Minnesota)
Inflows and Outflows in the Dwarf Starburst Galaxy NGC 5253: High-Resolution HI Observations
36 pages, 12 figures; Accepted for Publication in the Astronomical Journal ; a postscript version with high resolution figures can be found at http://physics.uwyo.edu/~chip/Papers/
null
10.1088/0004-6256/135/2/527
null
astro-ph
null
VLA and Parkes 64 m radiotelescope 21-cm observations of the starburst dwarf galaxy NGC 5253 reveal a multi-component non-axisymmetric HI distribution. The component associated with the stellar body shows evidence for a small amount of rotational support aligned with the major axis, in agreement with optically measured kinematics and consistent with the small galaxian mass. Approximately 20-30% of the HI emission is associated with a second component, an HI "plume" extending along the optical minor axis to the southeast. We consider outflow, inflow, and tidal origins for this feature. Outflow appears improbable, inflow is a possibility, and tidal debris is most consistent with the observations. These observations also reveal a filamentary third component that includes an 800 pc diameter HI shell or bubble to the west of the nucleus, coinciding with an Halpha shell. The mass of HI in the shell may be as large as ~4x10^6 Msun. This large mass, coupled with the lack of expansion signatures in the neutral and ionized gas (v<30 km/s), suggests that this feature may be an example of a starburst-blown bubble stalled by interaction with a massive neutral envelope. Many other HI kinematic features closely resemble those seen in Halpha emission from the ionized gas, supporting the interpretation of neutral and ionized gas outflow at velocities of ~30 km/s. Comparison between extinction estimates from the Balmer emission-line decrement and the HI column densities suggest a gas-to-dust ratio 2-3 times the Galactic value in this low-metallicity (Z=1/4 Zsun) galaxy.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 23:08:33 GMT" } ]
2009-11-13T00:00:00
[ [ "Kobulnicky", "Henry A.", "", "University of Wyoming" ], [ "Skillman", "Evan. D.", "", "University of Minnesota" ] ]
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711.2689
Saulo Carneiro
H. A. Borges, S. Carneiro, J. C. Fabris, C. Pigozzo
Evolution of density perturbations in decaying vacuum cosmology
Revised version. To appear in Physical Review D
Phys.Rev.D77:043513,2008
10.1103/PhysRevD.77.043513
null
astro-ph gr-qc hep-th
null
We study cosmological perturbations in the context of an interacting dark energy model, in which the cosmological term decays linearly with the Hubble parameter, with concomitant matter production. A previous joint analysis of the redshift-distance relation for type Ia supernovas, baryonic acoustic oscillations, and the position of the first peak in the anisotropy spectrum of the cosmic microwave background has led to acceptable values for the cosmological parameters. Here we present our analysis of small perturbations, under the assumption that the cosmological term, and therefore the matter production, are strictly homogeneous. Such a homogeneous production tends to dilute the matter contrast, leading to a late-time suppression in the power spectrum. Nevertheless, an excellent agreement with the observational data can be achieved by using a higher matter density as compared to the concordance value previously obtained. This may indicate that our hypothesis of homogeneous matter production must be relaxed by allowing perturbations in the interacting cosmological term.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 22:16:38 GMT" }, { "version": "v2", "created": "Tue, 12 Feb 2008 14:54:55 GMT" } ]
2008-11-26T00:00:00
[ [ "Borges", "H. A.", "" ], [ "Carneiro", "S.", "" ], [ "Fabris", "J. C.", "" ], [ "Pigozzo", "C.", "" ] ]
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711.269
Laura Kasian
L.E. Kasian (for the PALFA consortium)
Timing and Precession of the Young, Relativistic Binary Pulsar PSR J1906+0746
3 pages, 5 figures, To appear in the conference proceedings "40 Years of Pulsars: Millisecond Pulsars, Magnetars, and More", August 12-17, 2007, at McGill University, Montreal, Canada
AIP Conf.Proc.983:485-487,2008
10.1063/1.2900281
null
astro-ph
null
We present an updated timing solution and an analysis of the profile evolution - including precession and beam shape - of the young, relativistic binary pulsar J1906+0746. The 144-ms pulsar, in a 3.98-hour orbit with eccentricity 0.085 (Lorimer et al. 2006), was initially discovered during the early stages of the ALFA (Arecibo L-band Feed Array) pulsar survey (Cordes et al. 2006) using the 305-metre Arecibo telescope and was subsequently found in archival Parkes Multibeam Survey data. We have since been regularly monitoring the system using the Arecibo and Green Bank telescopes, and include data from the Jodrell Bank, Parkes, Nancay and Westerbork telescopes. The nature of the binary companion will also be discussed based on improved estimates of the total and companion masses obtained from the updated timing solution.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 22:16:45 GMT" } ]
2019-08-14T00:00:00
[ [ "Kasian", "L. E.", "", "for the PALFA consortium" ] ]
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711.2691
F. Javier Garcia de Abajo
I. Romero, T. V. Teperik, and F. J. Garcia de Abajo
Tunable Plasmon Molecules in Overlapping Nanovoids
4 pages, 4 figures
Physical Review B 77, 125403 (2008)
10.1103/PhysRevB.77.125403
null
cond-mat.mtrl-sci cond-mat.other
null
Coupled and shape-tailored metallic nanoparticles are known to exhibit hybridized plasmon resonances. This Letter discuss the optical properties of a complementary system formed by overlapped nanovoid dimers buried in gold and filled with silica. This is an alternative route for plasmon engineering that benefits from vanishing radiation losses. Our analysis demonstrates the possibility of designing artificial plasmon molecules on the basis of void plasmon hybridization, which allows fine mode tuning by varying the overlap between voids. The proposed structures could find application to both signal processing through buried optical elements and tunable-plasmon biosensing.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 22:23:40 GMT" } ]
2009-11-13T00:00:00
[ [ "Romero", "I.", "" ], [ "Teperik", "T. V.", "" ], [ "de Abajo", "F. J. Garcia", "" ] ]
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711.2692
Anyi Li
Anyi Li, Andrei Alexandru, Keh-Fei Liu
New results using the canonical approach to finite density QCD
7 pages, 3 figures, Contribution to Lattice 2007, Regensburg, Germany, 30 July - 4 August 2007
PoSLAT2007:203,2007
null
null
hep-lat
null
We present some new results regarding simulations of finite density QCD based on a canonical approach. A previous study has shown that such simulations are feasible, at least on small lattices. In the current study, we investigate some of the issues left open: we study the errors introduced by our approximation of the action and we show how to tune it to reduce the cost of the simulations while keeping the errors under control. To further reduce the cost of the simulations, we check the reliability of reweighting method with respect to the baryon number. Finally, using these optimizations, we carry out the simulations at larger densities than in our previous study to look for signals of a phase transition.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 22:25:58 GMT" } ]
2008-11-26T00:00:00
[ [ "Li", "Anyi", "" ], [ "Alexandru", "Andrei", "" ], [ "Liu", "Keh-Fei", "" ] ]
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711.2693
Doru P{\ba}unescu
Bernhard Rothenstein, Doru Paunescu
Transformation equations for the kinetic energy of the same particle: Filling the gap in special relativity literature
7 pages, 3 figures
null
null
null
physics.gen-ph
null
Transformation equations for the kinetic energy of a tardyon are derived in the limits of classical and of special relativity theory. Two formulas are presented. In the first one the energy of the particle in one of the involved reference frames is presented as a function of its proper energy, of the relative velocity of the two frames and of its speed in the second one. In the second one the kinetic energy in one of the involved reference frames is expressed as a function of its kinetic energy in the second one of its proper energy, of the relative velocity of the involved inertial reference frames and of its velocity relative to that frame. The obtained results are extended to the case of a photon that moves under the same geometrical conditions, recovering the formulas that account for the relativistic Doppler Effect, illustrating the behavior of a transformation equation when it should account for the properties of an electron and for those of a photon as well.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 22:39:32 GMT" }, { "version": "v2", "created": "Fri, 28 Dec 2007 11:31:44 GMT" } ]
2011-11-10T00:00:00
[ [ "Rothenstein", "Bernhard", "" ], [ "Paunescu", "Doru", "" ] ]
[ 0.0058341944, 0.0029905757, -0.0536099263, -0.045004122, -0.0343291648, 0.0666361973, 0.0039002397, 0.037715055, -0.0248298608, -0.0213264041, -0.0481548794, 0.0401369035, -0.0711507201, 0.012085746, 0.0126030352, 0.0162358135, 0.1376928687, -0.046697069, -0.0137904482, 0.0923595577, -0.0916071385, -0.1067495868, 0.0367275029, 0.0881271958, -0.0383028798, -0.1011064425, 0.0377620794, -0.0190456323, 0.0251590442, -0.0005308823, 0.0089937709, -0.0228430014, 0.0199861564, -0.1054328531, 0.0265933443, 0.1181299388, -0.0443222411, 0.0748657882, 0.0231486727, -0.0457330309, -0.0501770079, -0.0144840851, -0.1605476141, 0.1296983957, -0.1069376916, -0.0940995291, -0.0108630639, -0.0281216986, 0.0322600082, 0.0089408662, 0.00348876, -0.0352461748, 0.0492364839, 0.0150601566, -0.0718561113, 0.0832834914, 0.0037268305, 0.0097520687, -0.0330829658, -0.0564785264, -0.0157185253, -0.0505532213, -0.0572779737, 0.0613692589, -0.0717620626, 0.0056901765, -0.0951811299, 0.0423471406, -0.0063250307, 0.1354355961, 0.0552088171, 0.0860580355, 0.0905725583, 0.0781576261, -0.0061192908, -0.0209501944, -0.0094052497, 0.0307551678, 0.0727025867, 0.0377385654, 0.1019529104, -0.1391977072, 0.0058841598, 0.0163063519, -0.081496492, 0.0740663484, 0.0417593122, -0.0684231967, -0.0547385551, -0.0657427013, -0.0187046919, 0.0654605404, -0.0986610726, 0.0347523987, 0.0047202599, 0.040748246, 0.0264522657, -0.0289916843, 0.0064132051, 0.0631092265, 0.0628741011, -0.0395255648, -0.0089820139, 0.0116801448, 0.1154024228, 0.0104104364, -0.1014826521, 0.0695988536, -0.0016341623, -0.0004540972, -0.0135788303, -0.010886577, 0.0339764655, 0.012544252, -0.0422765985, -0.1070317477, -0.0709155872, 0.0162005443, -0.0877039582, 0.0738782436, -0.0477081314, -0.0190573875, 0.0504121408, -0.0598173924, -0.0117859542, -0.0958865285, 0.0155186625, -0.0650843307, -0.0993194431, 0.0425822698, 0.1165310517, 0.024876887, -0.0919363201, -0.1045863852, -0.0639086738, -0.0466735549, 0.0647551492, -0.0518699549, 0.1167191565, 0.0798035488, -0.0341175459, -0.0137199089, -0.033412151, 0.009822608, 0.0468616597, 0.1439943761, 0.0535158738, -0.0014078484, 0.0513526648, -0.0527634546, -0.0295795109, -0.0297441036, 0.0024174433, 0.0437108986, 0.0024056865, -0.0509764552, 0.0550677404, 0.0760414451, 0.0356694125, -0.0291562751, -0.0368920937, -0.0008405942, -0.133554548, -0.0137199089, 0.0640497506, -0.0439225174, -0.0297911298, -0.0316016413, -0.0628741011, -0.1606416702, -0.039078813, -0.0479667746, -0.1073139012, 0.0367980413, 0.115214318, -0.0002283345, 0.0009390555, -0.0264522657, -0.0207856037, 0.0869515389, 0.0302143656, -0.0095286937, 0.0499418788, -0.0282392632, 0.080555968, -0.0211970825, -0.0404896028, 0.1201990992, -0.0250179656, -0.0831894353, 0.0050729569, 0.1688242406, -0.010898334, -0.037644513, -0.0203388538, 0.0140961185, 0.0627330169, 0.0126147922, 0.0254882276, 0.0420884937, 0.0540801883, -0.0058959164, 0.1288519204, -0.0791922063, -0.0531396642, 0.0306376033, 0.0700691119, -0.0503651164, -0.1316734999, 0.0363748036, -0.0043969546, 0.0332005322, -0.0387966558, 0.0043264152, -0.0667302534, -0.0562433973, -0.1072198525, 0.1360939741, -0.0555380024, 0.0350110456, -0.1332723945, 0.0766527876, 0.0260995701, 0.0443927795, 0.035081584, -0.083612673, -0.0129204625, -0.0786278918, -0.0605698116, -0.0429584794, -0.0072714342, -0.0006168521, -0.0367510132, -0.0197627824, 0.0786278918, 0.0134730209, -0.042441193, -0.0732669011, -0.0978146046, -0.0840829387, -0.059253078, 0.013978553, -0.0615573637, -0.008400064, -0.0674356446, -0.0747247115, -0.0379972123, -0.017775923, 0.1102295294, -0.0846942812, 0.0702101961, 0.0751949772, 0.0727025867, 0.0050817742, -0.0040266225, 0.0525753498 ]
711.2694
Dmitry Pelinovsky
Dmitry Pelinovsky and Guido Schneider
Bounds on the tight-binding approximation for the Gross-Pitaevskii equation with a periodic potential
9 pages, 2 figures
null
null
null
math-ph math.DS math.MP
null
We justify the validity of the discrete nonlinear Schrodinger equation for the tight-binding approximation in the context of the Gross-Pitaevskii equation with a periodic potential. Our construction of the periodic potential and the associated Wannier functions is based on the previous work, while our analysis involving energy estimates and Gronwall's inequality addresses time-dependent localized solutions on large but finite time intervals.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 22:39:35 GMT" } ]
2007-11-20T00:00:00
[ [ "Pelinovsky", "Dmitry", "" ], [ "Schneider", "Guido", "" ] ]
[ -0.0228264183, 0.0224522147, 0.0634456128, -0.0117511991, -0.1020730734, -0.0186739657, -0.0726679191, 0.0011331729, -0.048912026, -0.038144622, -0.0721367896, 0.0208346881, -0.0398828574, 0.043093767, -0.0130126271, 0.0092283431, -0.0521953627, -0.0497328602, 0.0232971907, -0.0302501339, -0.0237076059, -0.0739233121, 0.0186498221, 0.1028456241, -0.0891811624, -0.1027490571, 0.081600517, -0.0305881239, 0.1182000414, 0.0563478135, -0.0421522222, -0.0149802137, -0.095023565, -0.0940095931, 0.0436973199, 0.1179103404, -0.0002787666, 0.1170412228, -0.0506019779, -0.0045025139, -0.0620936491, -0.0921747908, -0.13780348, 0.0447354317, 0.0191085245, 0.0621902198, -0.0654735565, -0.0457735471, 0.0742613003, -0.0778343454, -0.0379756279, 0.076289244, 0.0348854288, -0.0525333509, 0.0413313881, 0.0120107271, -0.0035398451, 0.0719436556, 0.0634456128, -0.0343784429, 0.0312399622, -0.0632041916, -0.0502157062, 0.0109364009, -0.1571172178, 0.0635421798, -0.0526782051, 0.0480187684, 0.0175996386, 0.0271840785, -0.0640250221, 0.0817453712, 0.0059329374, -0.1018799394, -0.0033799033, 0.0486223213, -0.0092283431, 0.0406312644, -0.0584240407, -0.0075625335, 0.0339680277, -0.0566858053, 0.0061200392, -0.0375893526, -0.1369343698, -0.0623833574, 0.0301535651, -0.0220538676, -0.1547995657, 0.043190334, -0.0538370311, 0.0790414512, 0.0133747598, 0.0602588467, 0.0294292998, -0.0464012437, 0.0166822374, -0.0032410857, 0.0527264886, -0.0139300292, 0.0156561937, -0.0285601821, 0.0450975671, -0.0434317552, 0.0983069018, 0.0470047966, -0.1092191562, -0.0086187534, -0.0795725808, -0.0077254931, 0.1017833725, 0.0259045437, -0.0813590959, 0.0196275804, 0.0084920069, -0.0299604274, -0.0129884854, -0.0205691252, -0.1172343567, 0.0440835953, 0.0249871407, 0.0262666754, 0.1065152362, -0.0821799338, 0.1690917313, -0.0013994912, -0.0422970727, -0.0503605567, -0.029743148, 0.0210881811, -0.0002614144, -0.0295258686, -0.0603071302, -0.0769169405, -0.1463015229, -0.0802002773, 0.0904365554, 0.036382243, 0.1422456354, 0.0803934112, 0.0441801623, 0.066294387, 0.0473427884, 0.0869600773, -0.0314572416, 0.1405074, -0.0017608692, -0.0551889911, 0.0200138558, -0.0106949797, -0.0167063791, 0.010417344, 0.1233181804, 0.0525816381, 0.0004421034, -0.0514710955, 0.0609831102, 0.0573617853, 0.0039532795, -0.0327850617, 0.0289464574, 0.0621902198, 0.0356579795, 0.0145094413, 0.1100882739, 0.0243111607, -0.066294387, -0.0093369829, 0.0107251573, -0.0027461713, 0.0296948645, -0.0727162063, -0.046208106, 0.010248349, 0.1242838725, 0.0627213493, -0.044952713, 0.0216434523, -0.1069980785, 0.032519497, 0.0900502801, 0.1058392525, 0.012185758, 0.0212451052, 0.0004213562, -0.0272806473, 0.0322539322, 0.12969172, 0.0303467028, -0.1701539904, -0.0358269736, 0.0773032159, 0.1125990599, 0.1051632762, -0.0659563988, -0.1520956457, 0.0527747758, 0.0384343266, -0.007604782, 0.0477290601, 0.0519539416, -0.1015902311, 0.0527264886, -0.0588585995, -0.0634938926, 0.0727644861, 0.0217762329, 0.0081540169, -0.0274496432, -0.0173340756, 0.0547061488, -0.0442525893, 0.074937284, -0.071509093, 0.0466909483, -0.0319883712, 0.0225004982, -0.0042942879, 0.0942993015, 0.0629144832, -0.0483567566, 0.0017095672, -0.0078763813, 0.063687034, 0.0782689005, -0.0482601896, 0.0297914334, 0.0535473228, 0.0177565627, -0.0398104303, 0.0267978031, 0.0105742682, 0.0228988435, -0.0642664433, 0.0361408219, -0.0034915607, 0.0962306708, 0.070157133, -0.0488637425, -0.07744807, 0.0060989144, 0.0541267358, -0.1188760251, -0.0168753732, 0.0250837095, -0.0305398405, 0.0188791733, 0.0328333452, 0.0829041973, -0.02251257, -0.0511813909, 0.043190334, 0.0377583466, 0.0731990486, -0.0391585939, -0.0256872643 ]
711.2695
Barry Simon
Barry Simon
Regularity and the Cesaro-Nevai class
null
null
null
null
math.SP
null
We consider OPRL and OPUC with measures regular in the sense of Ullman-Stahl-Totik and prove consequences on the Jacobi parameters or Verblunsky coefficients. For example, regularity on $[-2,2]$ implies $\lim_{N\to\infty} N^{-1} [\sum_{n=1}^N (a_n-1)^2 + b_n^2] =0$.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 22:40:26 GMT" } ]
2007-11-20T00:00:00
[ [ "Simon", "Barry", "" ] ]
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711.2696
Kevin P. Costello
Kevin P. Costello and Van Vu
On the Rank of Random Sparse Matrices
24 pages
null
null
null
math.PR math.CO
null
We investigate the rank of random (symmetric) sparse matrices. Our main finding is that with high probability, any dependency that occurs in such a matrix is formed by a set of few rows that contains an overwhelming number of zeros. This allows us to obtain an exact estimate for the co-rank.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 22:43:36 GMT" } ]
2007-11-20T00:00:00
[ [ "Costello", "Kevin P.", "" ], [ "Vu", "Van", "" ] ]
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711.2697
Adilet Imambekov
Adilet Imambekov and Leonid I. Glazman
Exact exponents of edge singularities in dynamic correlation functions of 1D Bose gas
minor misprints in published version fixed
Phys. Rev. Lett. 100, 206805 (2008)
10.1103/PhysRevLett.100.206805
null
cond-mat.str-el
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The spectral function and dynamic structure factor of bosons interacting by contact repulsion and confined to one dimension exhibit power-law singularities along the dispersion curves of the collective modes. We find the corresponding exponents exactly, by relating them to the known Bethe ansatz solution of the Lieb-Liniger model. The found exponents vary considerably with the interaction strength and momentum. Remarkably, the Luttinger liquid theory predictions for the exponents fail even at low energies, once the immediate vicinities of the edges are considered.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 22:54:39 GMT" }, { "version": "v2", "created": "Sun, 1 Jun 2008 00:13:19 GMT" }, { "version": "v3", "created": "Thu, 4 Sep 2008 18:54:41 GMT" } ]
2008-09-04T00:00:00
[ [ "Imambekov", "Adilet", "" ], [ "Glazman", "Leonid I.", "" ] ]
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711.2698
Mark Dijkstra
Mark Dijkstra
Continuum Emission by Cooling Clouds
7 pages, 5 figures, Accepted for Publication in ApJ. Many minor changes in the text. Main conclusions unaffected
Astrophys.J.690:82-88,2009
10.1088/0004-637X/690/1/82
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The collapse of baryons into the center of a host dark matter halo is accompanied by radiation that may be detectable as compact (< 10 kpc) UV-continuum and Lyman Alpha (hereafter Lya) emission with Lya luminosities as high as ~1e42-1e43 erg/s in halos of mass M=1e11-10e12 solar masses. We show that the observed equivalent width (EW) of the Lya line emitted by these cooling clouds is EW 400 Angstrom (restframe). These luminosities and EWs are comparable to those detected in narrowband surveys for redshifted Lya emission. The rest-frame ultraviolet of Lya emitting cooling clouds radiation may be dominated by two-photon transitions from 2s->1s. The resulting spectrum can distinguish cooling clouds from a broad class of young star forming galaxies.
[ { "version": "v1", "created": "Sat, 17 Nov 2007 13:55:19 GMT" }, { "version": "v2", "created": "Thu, 11 Sep 2008 17:19:40 GMT" } ]
2008-12-18T00:00:00
[ [ "Dijkstra", "Mark", "" ] ]
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711.2699
Matvei Libine
Igor Frenkel, Matvei Libine
Quaternionic Analysis, Representation Theory and Physics
final version, published in Advances in Mathematics, 60 pages, 3 figures; Advances in Mathematics, 2008
null
null
null
math.RT math-ph math.CV math.MP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We develop quaternionic analysis using as a guiding principle representation theory of various real forms of the conformal group. We first review the Cauchy-Fueter and Poisson formulas and explain their representation theoretic meaning. The requirement of unitarity of representations leads us to the extensions of these formulas in the Minkowski space, which can be viewed as another real form of quaternions. Representation theory also suggests a quaternionic version of the Cauchy formula for the second order pole. Remarkably, the derivative appearing in the complex case is replaced by the Maxwell equations in the quaternionic counterpart. We also uncover the connection between quaternionic analysis and various structures in quantum mechanics and quantum field theory, such as the spectrum of the hydrogen atom, polarization of vacuum, one-loop Feynman integrals. We also make some further conjectures. The main goal of this and our subsequent paper is to revive quaternionic analysis and to show profound relations between quaternionic analysis, representation theory and four-dimensional physics.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 23:00:24 GMT" }, { "version": "v2", "created": "Fri, 7 Dec 2007 03:47:25 GMT" }, { "version": "v3", "created": "Sun, 27 Apr 2008 15:32:48 GMT" }, { "version": "v4", "created": "Sun, 25 May 2008 19:40:15 GMT" }, { "version": "v5", "created": "Fri, 22 Jul 2011 18:15:43 GMT" } ]
2011-07-25T00:00:00
[ [ "Frenkel", "Igor", "" ], [ "Libine", "Matvei", "" ] ]
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711.27
Barry Simon
Barry Simon
Equilibrium measures and capacities in spectral theory
null
null
null
null
math.SP
null
This is a comprehensive review of the uses of potential theory in studying the spectral theory of orthogonal polynomials. Much of the article focuses on the Stahl-Totik theory of regular measures, especially the case of OPRL and OPUC. Links are made to the study of ergodic Schrodinger operators where one of our new results implies that, in complete generality, the spectral measure is supported on a set of zero Hausdorff dimension (indeed, of capacity zero) in the region of strictly positive Lyapunov exponent. There are many examples and some new conjectures and indications of new research directions. Included are appendices on potential theory and on Fekete-Szego theory.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 23:06:30 GMT" } ]
2007-11-20T00:00:00
[ [ "Simon", "Barry", "" ] ]
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711.2701
Barry Simon
Yury Kreimer, Yoram Last, and Barry Simon
Monotone Jacobi parameters and non-Szego weights
null
null
null
null
math.SP
null
We relate asymptotics of Jacobi parameters to asymptotics of the spectral weights near the edges. Typical of our results is that for $a_n\equiv 1$, $b_n =-C n^{-\beta}$ ($0<\beta< \frac23)$, one has $d\mu(x)= w(x) dx$ on $(-2,2)$, and near $x=2$, $w(x)=e^{-2Q(x)}$ where \[ Q(x)=\beta^{-1} C^{\frac{1}{\beta}} \frac{\Gamma(\frac32)\Gamma(\frac{1}\beta}-\frac12)(2-x)^{\frac12 -\frac{1}{\beta}}}{\Gamma(\frac{1}{\beta}+1)}(1+O((2-x))) \]
[ { "version": "v1", "created": "Fri, 16 Nov 2007 23:19:03 GMT" } ]
2007-11-20T00:00:00
[ [ "Kreimer", "Yury", "" ], [ "Last", "Yoram", "" ], [ "Simon", "Barry", "" ] ]
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711.2702
Petr Navratil
Petr Navratil
Ab initio no-core shell model calculations for light nuclei
To be printed in the Proceedings of the International School of Physics "Enrico Fermi" Course CLXIX - "Nuclear Structure far from Stability: New Physics and new Technology". 38 pages, 19 figures
null
null
UCRL-PROC-232457
nucl-th
null
An overview of the ab initio no-core shell model is presented. Recent results for light nuclei obtained with the chiral two-nucleon and three-nucleon interactions are highlighted. Cross section calculations of capture reactions important for astrophysics are discussed. The extension of the ab initio no-core shell model to the description of nuclear reactions by the resonating group method technique is outlined.
[ { "version": "v1", "created": "Sat, 17 Nov 2007 00:35:28 GMT" } ]
2007-11-20T00:00:00
[ [ "Navratil", "Petr", "" ] ]
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711.2703
David Damanik
David Damanik (Rice), Alexander Pushnitski (King's College), Barry Simon (Caltech)
The Analytic Theory of Matrix Orthogonal Polynomials
85 pages
Surv. Approx. Theory 4 (2008), 1-85
null
null
math.CA math.SP
null
We give a survey of the analytic theory of matrix orthogonal polynomials.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 23:38:27 GMT" }, { "version": "v2", "created": "Thu, 31 Jan 2008 14:59:36 GMT" } ]
2014-12-30T00:00:00
[ [ "Damanik", "David", "", "Rice" ], [ "Pushnitski", "Alexander", "", "King's College" ], [ "Simon", "Barry", "", "Caltech" ] ]
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711.2704
Christopher Hoffman
Eric Babson, Christopher Hoffman and Matthew Kahle
The fundamental group of random 2-complexes
28 pages, 3 figures; major revisions
J. Amer. Math. Soc. 24 (2011), 1-28
null
null
math.CO math.GR math.GT math.PR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study Linial-Meshulam random 2-complexes, which are two-dimensional analogues of Erd\H{o}s-R\'enyi random graphs. We find the threshold for simple connectivity to be p = n^{-1/2}. This is in contrast to the threshold for vanishing of the first homology group, which was shown earlier by Linial and Meshulam to be p = 2 log(n)/n. We use a variant of Gromov's local-to-global theorem for linear isoperimetric inequalities to show that when p = O(n^{-1/2 -\epsilon}) the fundamental group is word hyperbolic. Along the way we classify the homotopy types of sparse 2-dimensional simplicial complexes and establish isoperimetric inequalities for such complexes. These intermediate results do not involve randomness and may be of independent interest.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 23:49:17 GMT" }, { "version": "v2", "created": "Fri, 7 Nov 2008 23:03:52 GMT" }, { "version": "v3", "created": "Sat, 10 Jul 2010 23:40:35 GMT" }, { "version": "v4", "created": "Tue, 10 May 2011 19:04:00 GMT" } ]
2011-05-11T00:00:00
[ [ "Babson", "Eric", "" ], [ "Hoffman", "Christopher", "" ], [ "Kahle", "Matthew", "" ] ]
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711.2705
Marco Battaglia
Marco Battaglia, Benjamin Hooberman, Nicole Kelley
A Study of e+e- -> H0A0 Production at 1 TeV and the Constrain on Dark Matter Density
5 pages, 3 figures, to appear in the proceedings of the 2007 International Linear Collider Workshop, LCWS07, DESY, Hamburg, Germany, May30 - June 3, 2007
ECONF C0705302:HIG20,2007
null
null
hep-ph
null
This paper reports preliminary results of a study of the HA production process in e+e- collisions at a 1 TeV linear collider and their implication in the study of dark matter at particle colliders. The analysis is carried out using full Geant-4 simulation and reconstruction for the LDC detector model.
[ { "version": "v1", "created": "Sat, 17 Nov 2007 00:36:46 GMT" } ]
2009-02-16T00:00:00
[ [ "Battaglia", "Marco", "" ], [ "Hooberman", "Benjamin", "" ], [ "Kelley", "Nicole", "" ] ]
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711.2706
Maria N. Piacquadio
M.N. Piacquadio Losada
A formula for the fractal dimension d approx. 0.87 of the Cantorian set underlying the Devil's staircase associated with the Circle Map
53 pages double spaced, 1 figure
null
null
null
math-ph math.MP
null
The Cantor set complementary to the Devil's Staircase associated with the Circle Map has a fractal dimension d approximately equal to 0.87, a value that is universal for a wide range of maps, such results being of a numerical character. In this paper we deduce a formula for such dimensional value. The Devil's Staircase associated with the Circle Map is a function that transforms horizontal unit interval I onto vertical I, and is endowed with the Farey-Brocot (F-B) structure in the vertical axis via the rational heights of stability intervals. The underlying Cantor-dust fractal set Omega in the horizontal axis --Omega contained in I, with fractal dimension d(Omega) approx. 0.87-- has a natural covering with segments that also follow the F-B hierarchy: therefore, the staircase associates vertical I (of unit dimension) with horizontal Omega in I (of dimension approx. 0.87), i.e. it selects a certain subset Omega of I, both sets F- B structured, the selected Omega with smaller dimension than that of I. Hence, the structure of the staircase mirrors the F- B hierarchy. In this paper we consider the subset Omega-F-B of I that concentrates the measure induced by the F-B partition and calculate its Hausdorff dimension, i.e. the entropic or information dimension of the F-B measure, and show that it coincides with d(Omega) approx. 0.87. Hence, this dimensional value stems from the F-B structure, and we draw conclusions and conjectures from this fact. Finally, we calculate the statistical "Euclidean" dimension (based on the ordinary Lebesgue measure) of the F-B partition, and we show that it is the same as d(Omega-F-B), which permits conjecturing on the universality of the dimensional value d approximately equal to 0.87.
[ { "version": "v1", "created": "Sat, 17 Nov 2007 00:53:15 GMT" } ]
2007-11-20T00:00:00
[ [ "Losada", "M. N. Piacquadio", "" ] ]
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711.2707
Gregory Berkolaiko
G. Berkolaiko, J.M. Harrison, J.H. Wilson
Mathematical Aspects of Vacuum Energy on Quantum Graphs
Fixed several typos, explain the use of random matrices in Section 6
J.Phys.A42:025204,2009
10.1088/1751-8113/42/2/025204
null
math-ph math.MP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We use quantum graphs as a model to study various mathematical aspects of the vacuum energy, such as convergence of periodic path expansions, consistency among different methods (trace formulae versus method of images) and the possible connection with the underlying classical dynamics. We derive an expansion for the vacuum energy in terms of periodic paths on the graph and prove its convergence and smooth dependence on the bond lengths of the graph. For an important special case of graphs with equal bond lengths, we derive a simpler explicit formula. The main results are derived using the trace formula. We also discuss an alternative approach using the method of images and prove that the results are consistent. This may have important consequences for other systems, since the method of images, unlike the trace formula, includes a sum over special ``bounce paths''. We succeed in showing that in our model bounce paths do not contribute to the vacuum energy. Finally, we discuss the proposed possible link between the magnitude of the vacuum energy and the type (chaotic vs. integrable) of the underlying classical dynamics. Within a random matrix model we calculate the variance of the vacuum energy over several ensembles and find evidence that the level repulsion leads to suppression of the vacuum energy.
[ { "version": "v1", "created": "Sat, 17 Nov 2007 01:03:59 GMT" }, { "version": "v2", "created": "Tue, 20 Nov 2007 22:51:52 GMT" }, { "version": "v3", "created": "Fri, 13 Jun 2008 23:04:23 GMT" } ]
2008-12-18T00:00:00
[ [ "Berkolaiko", "G.", "" ], [ "Harrison", "J. M.", "" ], [ "Wilson", "J. H.", "" ] ]
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