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712.2479
Radu Roiban
R. Roiban and A.A. Tseytlin
Spinning superstrings at two loops: strong-coupling corrections to dimensions of large-twist SYM operators
31 pages, Latex. v2:minor corrections; few comments and references added v3: typos corrected
Phys.Rev.D77:066006,2008
10.1103/PhysRevD.77.066006
Imperial-TP-AT-2007-5, NI07095
hep-th
null
We consider folded spinning strings in AdS_5xS^5 (with one spin component S in AdS_5 and J in S^5) corresponding to the Tr(D^S Z^J) operators in the sl(2) sector of the N=4 SYM theory in the special scaling limit in which both the string mass M ~ \sqrt \lambda \ln S and J are sent to infinity with their ratio fixed. Expanding in the parameter \el= J/M we compute the 2-loop string sigma model correction to the string energy and show that it agrees with the expression proposed by Alday and Maldacena in arxiv:0708.0672. We suggest that a resummation of the logarithmic \el^2 \ln^n \el terms is necessary in order to establish an interpolation to the weakly coupled gauge theory results. In the process, we set up a general framework for the calculation of higher loop corrections to the energy of multi-spin string configurations. In particular, we find that in addition to the direct 2-loop term in the string energy there is a contribution from lower loop order due to a finite ``renormalization'' of the relation between the parameters of the classical solution and the fixed spins, i.e. the charges of the SO(2,4) x SO(6) symmetry.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 17:00:17 GMT" }, { "version": "v2", "created": "Sat, 5 Jan 2008 16:24:36 GMT" }, { "version": "v3", "created": "Tue, 29 Jan 2008 21:42:24 GMT" } ]
2008-11-26T00:00:00
[ [ "Roiban", "R.", "" ], [ "Tseytlin", "A. A.", "" ] ]
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712.248
Vyacheslav Abramov M.
Vyacheslav M. Abramov
Takacs' asymptotic theorem and its applications: A survey
43 pages, Review paper, accepted to Acta Appl. Math
Acta Appl. Math. 109 (2010) 609--651
10.1007/s10440-008-9337-9
null
math.PR math.CA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The book of Lajos Tak\'acs \emph{Combinatorial Methods in the Theory of Stochastic Processes} has been published in 1967. It discusses various problems associated with $$ P_{k,i}=\mathrm{P}{\sup_{1\leq n\leq\rho(i)}(N_n-n)<k-i},\leqno(*) $$ where $N_n=\nu_1+\nu_2...+\nu_n$ is a sum of mutually independent, nonnegative integer and identically distributed random variables, $\pi_j=\mathrm{P}\{\nu_k=j\}$, $j\geq0$, $\pi_0>0$, and $\rho(i)$ is the smallest $n$ such that $N_n=n-i$, $i\geq1$. (If there is no such $n$, then $\rho(i)=\infty$.) (*) is a discrete generalization of the classic ruin probability, and its value is represented as $P_{k,i}={Q_{k-i}}/{Q_k}$, where the sequence $\{Q_k\}_{k\geq0}$ satisfies the recurrence relation of convolution type: $Q_0\neq0$ and $Q_k=\sum_{j=0}^k\pi_jQ_{k-j+1}$. Since 1967 there have been many papers related to applications of the generalized classic ruin probability. The present survey concerns only with one of the areas of application associated with asymptotic behavior of $Q_k$ as $k\to\infty$. The theorem on asymptotic behavior of $Q_k$ as $k\to\infty$ and further properties of that limiting sequence are given on pages 22-23 of the aforementioned book by Tak\'acs. In the present survey we discuss applications of Tak\'acs' asymptotic theorem and other related results in queueing theory, telecommunication systems and dams. Many of the results presented in this survey have appeared recently, and some of them are new. In addition, further applications of Tak\'acs' theorem are discussed.
[ { "version": "v1", "created": "Sat, 15 Dec 2007 00:04:20 GMT" }, { "version": "v2", "created": "Wed, 21 May 2008 00:21:47 GMT" }, { "version": "v3", "created": "Fri, 23 May 2008 05:12:41 GMT" }, { "version": "v4", "created": "Fri, 5 Sep 2008 23:21:11 GMT" } ]
2021-06-30T00:00:00
[ [ "Abramov", "Vyacheslav M.", "" ] ]
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712.2481
Kazuyuki Fujii
Kazuyuki Fujii (Yokohama City University)
A Higher Order Non--Linear Differential Equation and a Generalization of the Airy Function
Latex ; 6 pages ; no figure. This is my mathematical note
Far East Journal of Mathematical Education, 13(2014) 57-63
null
null
math-ph math.MP quant-ph
null
In this paper a higher order non-linear differential equation is given and it becomes a higher order Airy equation (in our terminology) under the Cole-Hopf transformation. For the even case a solution is explicitly constructed, which is a generalization of the Airy function.
[ { "version": "v1", "created": "Sat, 15 Dec 2007 00:05:22 GMT" } ]
2014-09-23T00:00:00
[ [ "Fujii", "Kazuyuki", "", "Yokohama City University" ] ]
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712.2482
Andreas M\"unch
M. D. Korzec, P. L. Evans, A. M\"unch, B. Wagner
Stationary solutions of driven fourth- and sixth-order Cahn-Hilliard type equations
null
SIAM J. Appl. Math. Volume 69, Issue 2, pp. 348-374 (2008)
10.1137/070710949
null
math-ph math.DS math.MP
null
New types of stationary solutions of a one-dimensional driven sixth-order Cahn-Hilliard type equation that arises as a model for epitaxially growing nano-structures such as quantum dots, are derived by an extension of the method of matched asymptotic expansions that retains exponentially small terms. This method yields analytical expressions for far-field behavior as well as the widths of the humps of these spatially non-monotone solutions in the limit of small driving force strength which is the deposition rate in case of epitaxial growth. These solutions extend the family of the monotone kink and antikink solutions. The hump spacing is related to solutions of the Lambert $W$ function. Using phase space analysis for the corresponding fifth-order dynamical system, we use a numerical technique that enables the efficient and accurate tracking of the solution branches, where the asymptotic solutions are used as initial input. Additionally, our approach is first demonstrated for the related but simpler driven fourth-order Cahn-Hilliard equation, also known as the convective Cahn-Hilliard equation.
[ { "version": "v1", "created": "Sat, 15 Dec 2007 00:08:53 GMT" } ]
2008-11-14T00:00:00
[ [ "Korzec", "M. D.", "" ], [ "Evans", "P. L.", "" ], [ "Münch", "A.", "" ], [ "Wagner", "B.", "" ] ]
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712.2483
Shangbin Cui
Shangbin Cui
Lie Group Action and Stability Analysis of Stationary Solutions for a Free Boundary Problem Modelling Tumor Growth
null
null
null
null
math.AP math.FA
null
In this paper we study asymptotic behavior of solutions for a multidimensional free boundary problem modelling the growth of nonnecrotic tumors. We first establish a general result for differential equations in Banach spaces possessing a local Lie group action which maps a solution into new solutions. We prove that a center manifold exists under certain assumptions on the spectrum of the linearized operator without assuming that the space in which the equation is defined is of either $D_A(\theta)$ or $D_A(\theta,\infty)$ type. By using this general result and making delicate analysis of the spectrum of the linearization of the stationary free boundary problem, we prove that if the surface tension coefficient $\gamma$ is larger than a threshold value $\gamma^\ast$ then the unique stationary solution is asymptotically stable modulo translations, provided the constant $c$ representing the ratio between the nutrient diffusion time and the tumor-cell doubling time is sufficiently small, whereas if $\gamma< \gamma^\ast$ then this stationary solution is unstable.
[ { "version": "v1", "created": "Sat, 15 Dec 2007 00:12:12 GMT" } ]
2007-12-18T00:00:00
[ [ "Cui", "Shangbin", "" ] ]
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712.2484
Shangbin Cui
Shangbin Cui
Asymptotic Stability of the Stationary Solution for a Hyperbolic Free Boundary Problem Modeling Tumor Growth
null
null
null
null
math.AP math.FA
null
In this paper we study asymptotic behavior of solutions for a free boundary problem modeling the growth of tumors containing two species of cells: proliferating cells and quiescent cells. This tumor model was proposed by Pettet et al in {\em Bull. Math. Biol.} (2001). By using a functional approach and the $C_0$ semigroup theory, we prove that the unique stationary solution of this model ensured by the work of Cui and Friedman ({\em Trans. Amer. Math. Soc.}, 2003) is locally asymptotically stable in certain function spaces. Key techniques used in the proof include an improvement of the linear estimate obtained by the work of Chen et al ({\em Trans. Amer. Math. Soc.}, 2005), and a similarity transformation.
[ { "version": "v1", "created": "Sat, 15 Dec 2007 00:22:47 GMT" } ]
2007-12-18T00:00:00
[ [ "Cui", "Shangbin", "" ] ]
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712.2485
Jan Ambjorn
J. Ambjorn, A. Gorlich, J. Jurkiewicz and R. Loll
Planckian Birth of the Quantum de Sitter Universe
Article unchanged. Line added in acknowledgment
Phys.Rev.Lett.100:091304, 2008
10.1103/PhysRevLett.100.091304
ITP-UU-07/64
hep-th gr-qc hep-lat
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We show that the quantum universe emerging from a nonperturbative, Lorentzian sum-over-geometries can be described with high accuracy by a four-dimensional de Sitter spacetime. By a scaling analysis involving Newton's constant, we establish that the linear size of the quantum universes under study is in between 17 and 28 Planck lengths. Somewhat surprisingly, the measured quantum fluctuations around the de Sitter universe in this regime are to good approximation still describable semiclassically. The numerical evidence presented comes from a regularization of quantum gravity in terms of causal dynamical triangulations.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 11:15:12 GMT" }, { "version": "v2", "created": "Thu, 8 Jan 2009 14:40:10 GMT" } ]
2009-12-15T00:00:00
[ [ "Ambjorn", "J.", "" ], [ "Gorlich", "A.", "" ], [ "Jurkiewicz", "J.", "" ], [ "Loll", "R.", "" ] ]
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712.2486
Rene Stock
Nathan S. Babcock, Rene Stock, Mark G. Raizen, Barry C. Sanders
Entangling identical bosons in optical tweezers via exchange interaction
9 pages, 3 figures
Can. J. Phys. 86, 549 (2008)
10.1139/P08-004
null
quant-ph
null
We first devise a scheme to perform a universal entangling gate via controlled collisions between pairs of atomic qubits trapped with optical tweezers. Second, we present a modification to this scheme to allow the preparation of atomic Bell pairs via selective excitation, suitable for quantum information processing applications that do not require universality. Both these schemes are enabled by the inherent symmetries of identical composite particles, as originally proposed by Hayes et al. Our scheme provides a technique for producing weighted graph states, entangled resources for quantum communication, and a promising approach to performing a "loophole free" Bell test in a single laboratory.
[ { "version": "v1", "created": "Sat, 15 Dec 2007 01:01:36 GMT" } ]
2008-12-03T00:00:00
[ [ "Babcock", "Nathan S.", "" ], [ "Stock", "Rene", "" ], [ "Raizen", "Mark G.", "" ], [ "Sanders", "Barry C.", "" ] ]
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712.2487
Hitoshi Nishino
Hitoshi Nishino and Subhash Rajpoot
Comment on Papers by Foot, Kobakhidze, McDonald and Volkas Relating to Scale Invariance Symmetry
3 pages, no figures
null
null
CSULB-PA-07-9
hep-ph
null
We point out that the works described by Foot et al. in arXiv:0706.1829 [hep-ph] and arXiv:0709.2750 [hep-ph] are derivatives of our work described in arXiv:hep-th/0403039, the extended version of which was published in "Standard Model and SU(5) GUT with Local Scale Invariance and the Weylon", AIP Conf. Proc. 881 (2007) pp. 82, Melville, New York, 2006. We are wondering how many motions (and publications!) they will go through before finally admitting that they have re-discovered our model, and of course, as is the usual practice these days, claiming afterwards to the world of their independent arrival at our model. Reference to our original work is long overdue.
[ { "version": "v1", "created": "Sat, 15 Dec 2007 01:50:26 GMT" } ]
2007-12-18T00:00:00
[ [ "Nishino", "Hitoshi", "" ], [ "Rajpoot", "Subhash", "" ] ]
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712.2488
Peinado Eduardo
A. Mondrag\'on, M. Mondrag\'on and E. Peinado
Nearly tri-bimaximal mixing in the S_3 flavour symmetry
6 pages, Talk given at XI Mexican Workshop on Particles and Fields, Tuxtla Gutierrez, Chiapas, Mexico, 7-12 Nov 2007. To be published in AIP conference proceedings
AIP Conf.Proc.1026:164-169,2008
10.1063/1.2965040
null
hep-ph
null
We present an analysis of the theoretical neutrino mixing matrix, V_{PMNS}^{th}, previously derived in the framework of the minimal S_3-invariant extension of the Standard Model. All entries in the neutrino mixing matrix, V_{PMNS}^{th}, the mixing angles and the Majorana phases are given as exact, explicit analytical functions of the mass ratios of the charged leptons and neutrinos, and one Dirac phase, in excellent agreement with the the latest experimental data. Here, it will be shown that all entries in V_{PMNS}^{th} are numerically very close to the tri-bimaximal form of the neutrino mixing matrix, so that V_{PMNS}^{th} may be written as V^{tri}+\Delta V_{PMNS}^{tri}. The small correction \Delta V_{PMNS}^{tri} is expressed as a sum of two terms: first, a small correction term proportional to m_{e}/m_{\mu} depending only on the charged lepton mass ratios and, second, a Cabbibo-like, small term, \delta t_{12}, which is a function of both the charged lepton and the neutrino mass ratios.
[ { "version": "v1", "created": "Sat, 15 Dec 2007 02:35:23 GMT" } ]
2009-01-06T00:00:00
[ [ "Mondragón", "A.", "" ], [ "Mondragón", "M.", "" ], [ "Peinado", "E.", "" ] ]
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712.2489
Nader Haghighipour
Nader Haghighipour
Habitable Planet Formation in Extreme Planetary Systems: Systems with Multiple Stars and/or Multiple Planets
6 pages, 5 figures, to appear in the Proceedings of the 249th IAU Meeting: "Exoplanets: Detection, Formation and Dynamics" (Suzhou, China)
IAU Symp.Proc. 249 (2008) 319-324
10.1017/S1743921308016773
null
astro-ph
null
Understanding the formation and dynamical evolution of habitable planets in extrasolar planetary systems is a challenging task. In this respect, systems with multiple giant planets and/or multiple stars present special complications. The formation of habitable planets in these environments is strongly affected by the dynamics of their giant planets and/or their stellar companions. These objects have profound effects on the structure of the disk of planetesimals and protoplanetary objects in which terrestrial-class planets are formed. To what extent the current theories of planet formation can be applied to such "extreme" planetary systems depends on the dynamical characteristics of their planets and/or their binary stars. In this paper, I present the results of a study of the possibility of the existence of Earth-like objects in systems with multiple giant planets (namely Upsilon Andromedae, 47 UMa, GJ 876, and 55 Cnc) and discuss the dynamics of the newly discovered Neptune-size object in 55 Cnc system. I will also review habitable planet formation in binary systems and present the results of a systematic search of the parameter-space for which Earth-like objects can form and maintain long-term stable orbits in the habitable zones of binary stars.
[ { "version": "v1", "created": "Sat, 15 Dec 2007 03:20:11 GMT" } ]
2009-11-13T00:00:00
[ [ "Haghighipour", "Nader", "" ] ]
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712.249
Dominic William Berry
Dominic W. Berry, Hyunseok Jeong, Magdalena Stobinska, Timothy C. Ralph
The standard fair sampling assumption is not necessary to test local realism
12 pages, includes experimental proposal
Phys. Rev. A 81, 012109 (2010)
10.1103/PhysRevA.81.012109
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Almost all Bell-inequality experiments to date have used postselection, and therefore relied on the fair sampling assumption for their interpretation. The standard form of the fair sampling assumption is that the loss is independent of the measurement settings, so the ensemble of detected systems provides a fair statistical sample of the total ensemble. This is often assumed to be needed to interpret Bell inequality experiments as ruling out hidden-variable theories. Here we show that it is not necessary; the loss can depend on measurement settings, provided the detection efficiency factorises as a function of the measurement settings and any hidden variable. This condition implies that Tsirelson's bound must be satisfied for entangled states. On the other hand, we show that it is possible for Tsirelson's bound to be violated while the CHSH-Bell inequality still holds for unentangled states, and present an experimentally feasible example.
[ { "version": "v1", "created": "Sat, 15 Dec 2007 03:32:51 GMT" }, { "version": "v2", "created": "Mon, 21 Sep 2009 20:29:27 GMT" } ]
2010-01-29T00:00:00
[ [ "Berry", "Dominic W.", "" ], [ "Jeong", "Hyunseok", "" ], [ "Stobinska", "Magdalena", "" ], [ "Ralph", "Timothy C.", "" ] ]
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712.2491
Haluk Bingol
Arzucan Ozgur, Burak Cetin, Haluk Bingol
Co-occurrence Network of Reuters News
10 pages, 4 figures, 6 tables
International Journal of Modern Physics C, Vol. 19, No. 5 (2008) 689-702
null
null
physics.soc-ph
null
Networks describe various complex natural systems including social systems. We investigate the social network of co-occurrence in Reuters-21578 corpus, which consists of news articles that appeared in the Reuters newswire in 1987. People are represented as vertices and two persons are connected if they co-occur in the same article. The network has small-world features with power-law degree distribution. The network is disconnected and the component size distribution has power law characteristics. Community detection on a degree-reduced network provides meaningful communities. An edge-reduced network, which contains only the strong ties has a star topology. "Importance" of persons are investigated. The network is the situation in 1987. After 20 years, a better judgment on the importance of the people can be done. A number of ranking algorithms, including Citation count, PageRank, are used to assign ranks to vertices. The ranks given by the algorithms are compared against how well a person is represented in Wikipedia. We find up to medium level Spearman's rank correlations. A noteworthy finding is that PageRank consistently performed worse than the other algorithms. We analyze this further and find reasons.
[ { "version": "v1", "created": "Sat, 15 Dec 2007 03:37:24 GMT" } ]
2008-08-07T00:00:00
[ [ "Ozgur", "Arzucan", "" ], [ "Cetin", "Burak", "" ], [ "Bingol", "Haluk", "" ] ]
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712.2492
Wei-Tou Ni
Wei-Tou Ni
ASTROD and ASTROD I -- Overview and Progress
17 pages, 6 figures, presented to The Third International ASTROD Symposium on Laser Astrodynamics, Space Test of Relativity and Gravitational-Wave Astronomy, Beijing, July 14-16, 2006; International Journal of Modern Physics D, in press (2008)
Int.J.Mod.Phys.D17:921-940,2008
10.1142/S0218271808012619
null
astro-ph gr-qc hep-ph hep-th
null
In this paper, we present an overview of ASTROD (Astrodynamical Space Test of Relativity using Optical Devices) and ASTROD I mission concepts and studies. The missions employ deep-space laser ranging using drag-free spacecraft to map the gravitational field in the solar-system. The solar-system gravitational field is determined by three factors: the dynamic distribution of matter in the solar system; the dynamic distribution of matter outside the solar system (galactic, cosmological, etc.) and gravitational waves propagating through the solar system. Different relativistic theories of gravity make different predictions of the solar-system gravitational field. Hence, precise measurements of the solar-system gravitational field test all these. The tests and observations include: (i) a precise determination of the relativistic parameters beta and gamma with 3-5 orders of magnitude improvement over previous measurements; (ii) a 1-2 order of magnitude improvement in the measurement of G-dot; (iii) a precise determination of any anomalous, constant acceleration Aa directed towards the Sun; (iv) a measurement of solar angular momentum via the Lense-Thirring effect; (v) the detection of solar g-mode oscillations via their changing gravity field, thus, providing a new eye to see inside the Sun; (vi) precise determination of the planetary orbit elements and masses; (viii) better determination of the orbits and masses of major asteroids; (ix) detection and observation of gravitational waves from massive black holes and galactic binary stars in the frequency range 0.05 mHz to 5 mHz; and (x) exploring background gravitational-waves.
[ { "version": "v1", "created": "Sat, 15 Dec 2007 04:13:59 GMT" } ]
2008-11-26T00:00:00
[ [ "Ni", "Wei-Tou", "" ] ]
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712.2493
Ryan Springall Mr.
Ryan Springall, Manolo Per and Ian K. Snook
Evaluation of the Permutational Structure of the Canonical Ensemble Partition Function
6 Figures, 8 pages
Phys. Rev. E 75, 031124 (2007)
10.1103/PhysRevE.75.031124
null
cond-mat.stat-mech
null
Proposed is an alternative method for permutational sampling in quantum gases using the path integral formulation of statistical mechanics. It is shown that in principle we are able to use two operators which enable us to construct a Markov chain through a graph of the irreducible representation of the symmetric group. As an illustration of this method, a test calculation of four particles in a harmonic trap is performed.
[ { "version": "v1", "created": "Sat, 15 Dec 2007 04:21:56 GMT" } ]
2009-11-13T00:00:00
[ [ "Springall", "Ryan", "" ], [ "Per", "Manolo", "" ], [ "Snook", "Ian K.", "" ] ]
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712.2494
Ciprian Demeter
Ciprian Demeter
Divergence of combinatorial averages and the unboundedness of the trilinear Hilbert transform
12 pages, 0 figures
null
null
null
math.CA math.DS
null
We consider multilinear averages in ergodic theory and harmonic analysis and prove their divergence in some range of $L^p$ spaces, with $p$ close enough to 1. We also prove that the trilinear Hilbert transform is unbounded in a similar range of $L^p$ spaces.
[ { "version": "v1", "created": "Sat, 15 Dec 2007 04:46:34 GMT" } ]
2007-12-18T00:00:00
[ [ "Demeter", "Ciprian", "" ] ]
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712.2495
George Cragg
George E. Cragg and Arthur K. Kerman
On the Quantum Instability of Attractive Bose Systems
60 pages, 6 figures, modified content, added references, corrected typos
null
null
null
cond-mat.other cond-mat.stat-mech
null
We explore the zero-temperature behavior of an assembly of bosons interacting through a zero-range, attractive potential. Because the two-body interaction admits a bound state, the many-body model is best described by a Hamiltonian that includes the coupling between atomic and molecular components. Due to the positive scattering length, the low-density collection is expected to remain stable against collapse despite the attraction between particles. Although a variational many-body analysis indicates a collapsing solution with only a molecular component to its condensate at low density, the expected atomic condensate solution can be obtained if the chemical potential is allowed to be complex valued. In addition to revealing two discrete eigenfrequencies associated with the molecular case, an expansion in small oscillations quantifies the imaginary part of the chemical potential as proportional to a coherent decay rate of the atomic condensate into a continuum of collective phonon excitations about the collapsing lower state.
[ { "version": "v1", "created": "Sat, 15 Dec 2007 05:50:15 GMT" }, { "version": "v2", "created": "Sat, 12 Jan 2008 01:04:34 GMT" } ]
2011-11-10T00:00:00
[ [ "Cragg", "George E.", "" ], [ "Kerman", "Arthur K.", "" ] ]
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712.2496
Wouter Bos
Wouter Bos (LMFA), Jean-Pierre Bertoglio (LMFA)
A single-time two-point closure based on fluid particle displacements
null
Physics of Fluids 18 (2006) 031706
10.1063/1.2185683
null
physics.flu-dyn
null
A new single-time two-point closure is proposed, in which the equation for the two-point correlation between the displacement of a fluid particle and the velocity allows one to estimate a Lagrangian timescale. This timescale is used to specify the nonlinear damping of triple correlations in the closure. A closed set of equations is obtained without ad hoc constants. Taking advantage of the analogy between particle displacements and scalar fluctuations in isotropic turbulence subjected to a mean scalar gradient, the model is numerically integrated. Results for the energy spectrum are in agreement with classical scaling predictions. An estimate for the Kolmogorov constant is obtained.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 19:34:13 GMT" } ]
2007-12-18T00:00:00
[ [ "Bos", "Wouter", "", "LMFA" ], [ "Bertoglio", "Jean-Pierre", "", "LMFA" ] ]
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712.2497
Fangwen Fu
Fangwen Fu and Mihaela van der Schaar
A New Theoretic Foundation for Cross-Layer Optimization
39 pages, 10 figures, technical report
null
null
null
cs.NI cs.LG
null
Cross-layer optimization solutions have been proposed in recent years to improve the performance of network users operating in a time-varying, error-prone wireless environment. However, these solutions often rely on ad-hoc optimization approaches, which ignore the different environmental dynamics experienced at various layers by a user and violate the layered network architecture of the protocol stack by requiring layers to provide access to their internal protocol parameters to other layers. This paper presents a new theoretic foundation for cross-layer optimization, which allows each layer to make autonomous decisions individually, while maximizing the utility of the wireless user by optimally determining what information needs to be exchanged among layers. Hence, this cross-layer framework does not change the current layered architecture. Specifically, because the wireless user interacts with the environment at various layers of the protocol stack, the cross-layer optimization problem is formulated as a layered Markov decision process (MDP) in which each layer adapts its own protocol parameters and exchanges information (messages) with other layers in order to cooperatively maximize the performance of the wireless user. The message exchange mechanism for determining the optimal cross-layer transmission strategies has been designed for both off-line optimization and on-line dynamic adaptation. We also show that many existing cross-layer optimization algorithms can be formulated as simplified, sub-optimal, versions of our layered MDP framework.
[ { "version": "v1", "created": "Sat, 15 Dec 2007 06:50:43 GMT" } ]
2007-12-18T00:00:00
[ [ "Fu", "Fangwen", "" ], [ "van der Schaar", "Mihaela", "" ] ]
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712.2498
Mario Maican
Mario Maican
A Duality Result for Moduli Spaces of Semistable Sheaves Supported on Projective Curves
In the second version we rewrite the proofs in the language of spectral sequences. The main results are unchanged. To appear in the Mathematical Journal of the University of Padua
Mathematical Journal of the University of Padua 123 (2010), 55-68
null
null
math.AG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We show that the moduli space M(r,c) of semistable sheaves on n-dimensional projective space with support of dimension one, with multiplicity r and with Euler characteristic c is isomorphic to M(r,-c).
[ { "version": "v1", "created": "Sat, 15 Dec 2007 07:34:12 GMT" }, { "version": "v2", "created": "Thu, 14 Jan 2010 15:54:35 GMT" } ]
2013-11-14T00:00:00
[ [ "Maican", "Mario", "" ] ]
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712.2499
Ning Wang
Ning Wang, Kai Zhao, Werner Scheid, Xizhen Wu
Fusion-fission reactions with modified Woods-Saxon potential
24 pages, 13 figures, 3 tables, accepted for publication in Phys. Rev. C
Phys.Rev.C77:014603,2008
10.1103/PhysRevC.77.014603
null
nucl-th
null
A modified Woods-Saxon potential model is proposed for a unified description of the entrance channel fusion barrier and the fission barrier of fusion-fission reactions based on the Skyrme energy-density functional approach. The fusion excitation functions of 120 reactions have been systematically studied. The fusion (capture) cross sections are well described with the calculated potential and an empirical barrier distribution. Incorporating a statistical model (HIVAP code) for describing the decay of the compound nucleus, the evaporation residue (and fission) cross sections of 51 fusion-fission reactions have been systematically investigated. Optimal values of some key parameters of the HIVAP code are obtained based on the experimental data of these reactions. The experimental data are reasonably well reproduced by the calculated results. The upper and lower confidence limits of the systematic errors of the calculated results are given.
[ { "version": "v1", "created": "Sat, 15 Dec 2007 07:36:19 GMT" } ]
2008-11-26T00:00:00
[ [ "Wang", "Ning", "" ], [ "Zhao", "Kai", "" ], [ "Scheid", "Werner", "" ], [ "Wu", "Xizhen", "" ] ]
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712.25
Tristan Guillot
Tristan Guillot (OCA)
The composition of transiting giant extrasolar planets
13 pages, 6 figures
Phys.ScriptaT130:014023,2008
10.1088/0031-8949/2008/T130/014023
null
astro-ph
null
In principle, the combined measurements of the mass and radius a giant exoplanet allow one to determine the relative fraction of hydrogen and helium and of heavy elements in the planet. However, uncertainties on the underlying physics imply that some known transiting planets appear anomalously large, and this generally prevent any firm conclusion when a planet is considered on an individual basis. On the basis of a sample of 9 transiting planets known at the time, Guillot et al. A&A 453, L21 (1996), concluded that all planets could be explained with the same set of hypotheses, either by large but plausible modifications of the equations of state, opacities, or by the addition of an energy source, probably related to the dissipation of kinetic energy by tides. On this basis, they concluded that the amount of heavy elements in close-in giant planets is correlated with the metallicity of the parent star. Furthermore they showed that planets around metal-rich stars can possess large amounts of heavy elements, up to 100 Earth masses. These results are confirmed by studying the present sample of 18 transiting planets with masses between that of Saturn and twice the mass of Jupiter.
[ { "version": "v1", "created": "Sat, 15 Dec 2007 07:47:56 GMT" } ]
2008-11-26T00:00:00
[ [ "Guillot", "Tristan", "", "OCA" ] ]
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712.2501
Liang Wang
Wang Liang, Wang Bing-wen, Guo Yi-Ping
Cell mapping description for digital control system with quantization effect
22 pages,14 figues
null
null
null
cs.OH
null
Quantization problem in digital control system have attracted more and more attention in these years. Normally, a quantized variable is regarded as a perturbed copy of the unquantized variable in the research of quantization effect, but this model has shown many obvious disadvantages in control system analysis and design process. In this paper, we give a new model for quantization based 'cell mapping' concept. This cell model could clearly describe the global dynamics of quantized digital system. Then some important characteristics of control system like controllability are analyzed by this model. The finite precision control design method based on cell concept is also presented.
[ { "version": "v1", "created": "Sat, 15 Dec 2007 08:58:50 GMT" }, { "version": "v2", "created": "Fri, 4 Jan 2008 00:53:08 GMT" } ]
2008-01-04T00:00:00
[ [ "Liang", "Wang", "" ], [ "Bing-wen", "Wang", "" ], [ "Yi-Ping", "Guo", "" ] ]
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712.2502
Carsten Deibel
C. Deibel, V. Dyakonov, J. Parisi
Band Bending Independent of Surface Passivation in ZnO/CdS/Cu(In,Ga)(S,Se)$_2$ Heterojunctions and Cr/Cu(In,Ga)(S,Se)$_2$ Schottky Contacts
3 pages, 3 figures
Applied Physics Letters 82 (2003) 3559-3561
10.1063/1.1576500
deibel2003a
cond-mat.mtrl-sci
null
We have employed admittance spectroscopy and deep-level transient spectroscopy in order to investigate the electronic properties of ZnO/CdS/Cu(In,Ga)(S,Se)$_2$ heterojunctions and Cr/Cu(In,Ga)(S,Se)$_2$ Schottky contacts. Our work concentrates on the origin of an energy-distributed defect state commonly found in these systems. The activation energy of the defect state addressed continuously shifts upon air annealing or damp-heat treatment and is a valuable measure of the degree of band bending in Cu(In,Ga)(S,Se)$_2$-based junctions. We demonstrate that the band bending within the Cu(In,Ga)(S,Se)$_2$ layer, reported in the literature to become minimal after air exposure, returns after the formation of either a Schottky contact or a heterojunction. The earlier phenomenon turns out to be independent of a surface passivation due to the CdS bath deposition.
[ { "version": "v1", "created": "Sat, 15 Dec 2007 09:05:08 GMT" } ]
2007-12-18T00:00:00
[ [ "Deibel", "C.", "" ], [ "Dyakonov", "V.", "" ], [ "Parisi", "J.", "" ] ]
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712.2503
Senthilkumar Vijayan
M. Lakshmanan and Avadh Saxena
Dynamic and Static Excitations of a Classical Discrete Anisotropic Heisenberg Ferromagnetic Spin Chain
Accepted for publication in Physica D
null
10.1016/j.physd.2007.11.005
null
nlin.SI cond-mat.other
null
Using Jacobi elliptic function addition formulas and summation identities we obtain several static and moving periodic soliton solutions of a classical anisotropic, discrete Heisenberg spin chain with and without an external magnetic field. We predict the dispersion relations of these nonlinear excitations and contrast them with that of magnons and relate these findings to the materials realized by a discrete spin chain. As limiting cases, we discuss different forms of domain wall structures and their properties.
[ { "version": "v1", "created": "Sat, 15 Dec 2007 09:49:15 GMT" } ]
2009-11-13T00:00:00
[ [ "Lakshmanan", "M.", "" ], [ "Saxena", "Avadh", "" ] ]
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712.2504
Siegfried Guertler
Siegfried Guertler, Matthias Troyer and Fu-Chun Zhang
Quantum Monte-Carlo study of a two-species boson Hubbard model
null
Phys. Rev. B 77, 184505 (2008)
10.1103/PhysRevB.77.184505
null
cond-mat.other
null
We consider a two-species hard-core boson Hubbard model for a supersolid, where the two types of bosons represent vacancies and interstitials doped into a commensurate crystal. The on-site inter-species interaction may create bound states of vacancies and interstitials facilitating vacancy condensation at lower energies than in a single-species model, as suggested in an earlier mean field study. Here we carry out quantum Monte Carlo simulation to study possible supersolid phases of the model, corresponding to superfluid phases of the vacancies or interstitials. At low temperatures, we find three distinct superfluid phases. The extent of the phases and the nature of the phase transitions are discussed in comparison to mean-field theory.
[ { "version": "v1", "created": "Sat, 15 Dec 2007 11:19:50 GMT" } ]
2014-01-27T00:00:00
[ [ "Guertler", "Siegfried", "" ], [ "Troyer", "Matthias", "" ], [ "Zhang", "Fu-Chun", "" ] ]
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712.2505
Nobuhiro Nakamura
Ximin Liu and Nobuhiro Nakamura
Nonsmoothable group actions on elliptic surfaces
22 pages
Topology Appl. 155 (2008), 946--964
null
null
math.GT math.DG
null
Let G be a cyclic group of order 3, 5 or 7, and X=E(n) be the relatively minimal elliptic surface with rational base. In this paper, we prove that under certain conditions on n, there exists a locally linear G-action on X which is nonsmoothable with respect to infinitely many smooth structures on X. This extends the main result of our previous paper.
[ { "version": "v1", "created": "Sat, 15 Dec 2007 11:17:40 GMT" }, { "version": "v2", "created": "Sat, 12 Jan 2008 07:08:52 GMT" } ]
2013-11-08T00:00:00
[ [ "Liu", "Ximin", "" ], [ "Nakamura", "Nobuhiro", "" ] ]
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712.2506
Rainer Grauer
Lukas Arnold, Juergen Dreher and Rainer Grauer
A semi-implicit Hall-MHD solver using whistler wave preconditioning
null
null
10.1016/j.cpc.2007.11.018
null
physics.comp-ph physics.flu-dyn physics.plasm-ph
null
The dispersive character of the Hall-MHD solutions, in particular the whistler waves, is a strong restriction to numerical treatments of this system. Numerical stability demands a time step dependence of the form $\Delta t\propto (\Delta x)^2$ for explicit calculations. A new semi--implicit scheme for integrating the induction equation is proposed and applied to a reconnection problem. It it based on a fix point iteration with a physically motivated preconditioning. Due to its convergence properties, short wavelengths converge faster than long ones, thus it can be used as a smoother in a nonlinear multigrid method.
[ { "version": "v1", "created": "Sat, 15 Dec 2007 11:21:21 GMT" } ]
2009-11-13T00:00:00
[ [ "Arnold", "Lukas", "" ], [ "Dreher", "Juergen", "" ], [ "Grauer", "Rainer", "" ] ]
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712.2507
Oleg Derzhko
Oleg Derzhko and Taras Verkholyak
Dynamic structure factors of the spin-1/2 XX chain with Dzyaloshinskii-Moriya interaction
null
Journal of the Physical Society of Japan Vol. 75 No. 10, October, 2006, 104711 (7 pages)
10.1143/JPSJ.75.104711
null
cond-mat.str-el cond-mat.stat-mech
null
We consider the spin-1/2 isotropic XY chain in a (z) transverse magnetic field with the Dzyaloshinskii-Moriya interaction directed along the z-axis in spin space and examine the effects of the latter interaction on the zz, xx (yy) and xy (yx) dynamic structure factors. The Dzyaloshinskii-Moriya interaction does not manifest itself in the zz dynamic quantities. In contrast, the xx (yy) and xy (yx) dynamic structure factors show dramatical changes owing to the Dzyaloshinskii-Moriya interaction. Implications of our results for electron spin resonance experiments are briefly discussed.
[ { "version": "v1", "created": "Sat, 15 Dec 2007 12:07:37 GMT" } ]
2007-12-18T00:00:00
[ [ "Derzhko", "Oleg", "" ], [ "Verkholyak", "Taras", "" ] ]
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712.2508
Francesco Plastina
G. Liberti, R. L. Zaffino, F. Piperno, F. Plastina
Entanglement sharing in $E\otimes\epsilon$ Jahn-Teller model in the presence of a magnetic field
null
Phys. Rev. A 76, 042332 (2007)
10.1103/PhysRevA.76.042332
null
quant-ph
null
We discuss the ground state entanglement of the $E\otimes\epsilon$ Jahn-Teller model in the presence of a strong transverse magnetic field as a function of the vibronic coupling strength. A complete characterization is given of the phenomenon of entanglement sharing in a system composed by a qubit coupled to two bosonic modes. Using the residual $I$-tangle, we find that three-partite entanglement is significantly present in the system in the parameter region near the bifurcation point of the corresponding classical model.
[ { "version": "v1", "created": "Sat, 15 Dec 2007 12:10:54 GMT" } ]
2009-11-13T00:00:00
[ [ "Liberti", "G.", "" ], [ "Zaffino", "R. L.", "" ], [ "Piperno", "F.", "" ], [ "Plastina", "F.", "" ] ]
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712.2509
Francesco Plastina
F. Plastina, T. J. G. Apollaro
Local control of entanglement in a spin chain
null
Phys. Rev. Lett. 99, 177210 (2007)
10.1103/PhysRevLett.99.177210
null
quant-ph
null
In a ferromagnetic spin chain, the control of the local effective magnetic field allows to manipulate the static and dynamical properties of entanglement. In particular, the propagation of quantum correlations can be driven to a great extent so as to achieve an entanglement transfer on demand toward a selected site.
[ { "version": "v1", "created": "Sat, 15 Dec 2007 12:18:09 GMT" } ]
2009-11-13T00:00:00
[ [ "Plastina", "F.", "" ], [ "Apollaro", "T. J. G.", "" ] ]
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712.251
Xiang Zhang Dong
Xiangdong Zhang
Observing Zitterbewegung for photons near the Dirac point of a two-dimensional photonic crystal
null
null
10.1103/PhysRevLett.100.113903
null
physics.optics
null
It is shown, for the first time, that the zitterbewegung of photon can appear near the Dirac point in two-dimensional photonic crystal. The superiority of such a phenomenon for photons is that it can be found in different scaling structures with wide frequency regions. It can be observed by measuring the time dependence of the transmission coefficient through photonic crystal slabs. Thus, it is particularly suited for experimentally observing this effect. We have observed such a phenomenon by exact numerical simulations, confirming a long-standing theoretical prediction.
[ { "version": "v1", "created": "Sat, 15 Dec 2007 12:33:03 GMT" } ]
2009-11-13T00:00:00
[ [ "Zhang", "Xiangdong", "" ] ]
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712.2511
Kenji Tomita
Kenji Tomita
Second-order power spectra of CMB anisotropies due to primordial random perturbations in flat cosmological models
11 pages
Phys.Rev.D77:103521,2008
10.1103/PhysRevD.77.103521
null
astro-ph
null
Second-order power spectra of Cosmic Microwave Background (CMB) anisotropies due to random primordial perturbations at the matter dominant stage are studied, based on the relativistic second-order theory of perturbations in flat cosmological models and on the second-order formula of CMB anisotropies derived by Mollerach and Matarrese. So far the second-order integrated Sachs-Wolfe effect has been analyzed using the three-point correlation or bispectrum. In this paper we derive the second-order term of power spectra given using the two-point correlation of temperature fluctuations. The second-order density perturbations are small, compared with the first-order ones. The second-order power spectra of CMB anisotropies, however, are not small at all, compared with the first-order power spectra, because at the early stage the first-order integrated Sachs-Wolfe effect is very small and the second-order integrated Sachs-Wolfe effect may be dominant over the first-order ones. So their characteristic behaviors may be measured through the future precise observation and bring useful informations on the structure and evolution of our universe in the future.
[ { "version": "v1", "created": "Sat, 15 Dec 2007 12:44:42 GMT" }, { "version": "v2", "created": "Sat, 5 Apr 2008 02:40:57 GMT" }, { "version": "v3", "created": "Wed, 4 Jun 2008 01:35:34 GMT" } ]
2008-11-26T00:00:00
[ [ "Tomita", "Kenji", "" ] ]
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712.2512
Vladimir Nikolaenko
V.Dorofeev, R.Dzheliadin, A.Ekimov, Yu.Gavrilov, Yu.Gouz, A.Ivashin, V.Kabachenko, I.Kachaev, A.Karyukhin, Yu.Khokhlov, V.Konstantinov, M.Makouski, V.Matveev, A.Myagkov, V.Nikolaenko, A.Ostankov, B.Polyakov, D.Ryabchikov, N.Shalanda, M.Soldatov, A.A.Solodkov, A.V.Solodkov, O.Solovianov, A.Zaitsev
Search for $f_1(1285) \to \pi^+\pi^-\pi^0$ decay with VES detector
10 pages, 8 figures, presented at XII Conference on Hadron Spectroscopy
null
10.1140/epja/i2008-10664-8
null
hep-ex
null
The isospin violating decay $f_1(1285)\to\pi^+\pi^-\pi^0$ has been studied at VES facility. This study is based at the statistics acquired in $\pi^- Be$ interactions at 27, 36.6 and 41 GeV/c in diffractive reaction $\pi^- N \to (f_1 \pi^-) N$. The $f_1(1285) \to \pi^+\pi^-\pi^0$ decay is observed. The ratio of decay probabilities $BR(f_1(1285) \to \pi^+\pi^-\pi^0)$ to $BR(f_1(1285) \to \eta \pi^+\pi^-) \cdot BR(\eta \to \gamma\gamma)$ is $\sim\:1.4%$.
[ { "version": "v1", "created": "Sat, 15 Dec 2007 14:36:51 GMT" } ]
2009-11-13T00:00:00
[ [ "Dorofeev", "V.", "" ], [ "Dzheliadin", "R.", "" ], [ "Ekimov", "A.", "" ], [ "Gavrilov", "Yu.", "" ], [ "Gouz", "Yu.", "" ], [ "Ivashin", "A.", "" ], [ "Kabachenko", "V.", "" ], [ "Kachaev", "I.", "" ], [ "Karyukhin", "A.", "" ], [ "Khokhlov", "Yu.", "" ], [ "Konstantinov", "V.", "" ], [ "Makouski", "M.", "" ], [ "Matveev", "V.", "" ], [ "Myagkov", "A.", "" ], [ "Nikolaenko", "V.", "" ], [ "Ostankov", "A.", "" ], [ "Polyakov", "B.", "" ], [ "Ryabchikov", "D.", "" ], [ "Shalanda", "N.", "" ], [ "Soldatov", "M.", "" ], [ "Solodkov", "A. A.", "" ], [ "Solodkov", "A. V.", "" ], [ "Solovianov", "O.", "" ], [ "Zaitsev", "A.", "" ] ]
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712.2513
Stephan Rosswog
S. Rosswog, E. Ramirez-Ruiz, W.R. Hix
Atypical Thermonuclear Supernovae from Tidally Crushed White Dwarfs
13 pages, 4 figures, ApJ, accepted
null
10.1086/528738
null
astro-ph
null
Suggestive evidence has accumulated that intermediate mass black holes (IMBH) exist in some globular clusters. As stars diffuse in the cluster, some will inevitable wander sufficiently close to the hole that they suffer tidal disruption. An attractive feature of the IMBH hypothesis is its potential to disrupt not only solar-type stars but also compact white dwarf stars. Attention is given to the fate of white dwarfs that approach the hole close enough to be disrupted and compressed to such extent that explosive nuclear burning may be triggered. Precise modeling of the dynamics of the encounter coupled with a nuclear network allow for a realistic determination of the explosive energy release, and it is argued that ignition is a natural outcome for white dwarfs of all varieties passing well within the tidal radius. Although event rates are estimated to be significantly less than the rate of normal Type Ia supernovae, such encounters may be frequent enough in globular clusters harboring an IMBH to warrant a search for this new class of supernova.
[ { "version": "v1", "created": "Sat, 15 Dec 2007 13:58:35 GMT" } ]
2009-11-13T00:00:00
[ [ "Rosswog", "S.", "" ], [ "Ramirez-Ruiz", "E.", "" ], [ "Hix", "W. R.", "" ] ]
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712.2514
Andrei Kataev
A.L. Kataev (INR, Moscow) and V.T. Kim (NPI, Gatchina)
Higgs Decay To \bar{b}b: Different Approaches To Resummation Of QCD Effects
4 pages, 2 figures, submitted tio the Proceedings of 13 Lomonosov Conference on Elementary Particle Physics, Moscow State University, August 23-29, 2007, 1 reference corrected
null
null
null
hep-ph
null
The comparison between parameterisations of the perturbation results for the decay width of the Standard Model Higgs boson to \bar{b}b-quarks pairs, based on application of \bar{MS}-scheme running quark mass and pole b-quark mass, are presented. In the case of the latter parameterisation taking into account of order O(\alpha_s^3) term is rather important. It is minimising deviations of the results obtained at the O(\alpha_s^2) level from the results, which follow from the running quark mass approach
[ { "version": "v1", "created": "Sat, 15 Dec 2007 13:58:53 GMT" }, { "version": "v2", "created": "Sun, 23 Dec 2007 18:49:09 GMT" } ]
2007-12-23T00:00:00
[ [ "Kataev", "A. L.", "", "INR, Moscow" ], [ "Kim", "V. T.", "", "NPI, Gatchina" ] ]
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712.2515
Fabio Lucio Toninelli
B. Derrida, G. Giacomin, H. Lacoin, F. L. Toninelli
Fractional moment bounds and disorder relevance for pinning models
20 pages, 1 figure; v2: few typos corrected, references revised. To appear on Commun. Math. Phys
Commun. Math. Phys. 287 (2009), 867-887.
10.1007/s00220-009-0737-0
null
math.PR cond-mat.dis-nn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the critical point of directed pinning/wetting models with quenched disorder. The distribution K(.) of the location of the first contact of the (free) polymer with the defect line is assumed to be of the form K(n)=n^{-\alpha-1}L(n), with L(.) slowly varying. The model undergoes a (de)-localization phase transition: the free energy (per unit length) is zero in the delocalized phase and positive in the localized phase. For \alpha<1/2 it is known that disorder is irrelevant: quenched and annealed critical points coincide for small disorder, as well as quenched and annealed critical exponents. The same has been proven also for \alpha=1/2, but under the assumption that L(.) diverges sufficiently fast at infinity, an hypothesis that is not satisfied in the (1+1)-dimensional wetting model considered by Forgacs et al. (1986) and Derrida et al. (1992), where L(.) is asymptotically constant. Here we prove that, if 1/2<\alpha<1 or \alpha >1, then quenched and annealed critical points differ whenever disorder is present, and we give the scaling form of their difference for small disorder. In agreement with the so-called Harris criterion, disorder is therefore relevant in this case. In the marginal case \alpha=1/2, under the assumption that L(.) vanishes sufficiently fast at infinity, we prove that the difference between quenched and annealed critical points, which is known to be smaller than any power of the disorder strength, is positive: disorder is marginally relevant. Again, the case considered by Forgacs et al. (1986) and Derrida et al. (1992) is out of our analysis and remains open.
[ { "version": "v1", "created": "Sat, 15 Dec 2007 14:16:04 GMT" }, { "version": "v2", "created": "Tue, 25 Nov 2008 16:58:40 GMT" } ]
2009-11-13T00:00:00
[ [ "Derrida", "B.", "" ], [ "Giacomin", "G.", "" ], [ "Lacoin", "H.", "" ], [ "Toninelli", "F. L.", "" ] ]
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712.2516
B. V. Ivanov
B.V.Ivanov
Purely electromagnetic spacetimes
8 pages
Phys.Rev.D77:044007,2008
10.1103/PhysRevD.77.044007
null
gr-qc
null
Electrovacuum solutions devoid of usual mass sources are classified in the case of one, two and three commuting Killing vectors. Three branches of solutions exist. Electromagnetically induced mass terms appear in some of them.
[ { "version": "v1", "created": "Sat, 15 Dec 2007 14:49:05 GMT" } ]
2008-11-26T00:00:00
[ [ "Ivanov", "B. V.", "" ] ]
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712.2517
Klaus Werner
Klaus Werner and Olaf Scholten
Macroscopic Treatment of Radio Emission from Cosmic Ray Air Showers based on Shower Simulations
null
Astropart.Phys.29:393-411,2008
10.1016/j.astropartphys.2008.04.004
null
astro-ph hep-ph
null
We present a macroscopic calculation of coherent electro-magnetic radiation from air showers initiated by ultra-high energy cosmic rays, based on currents obtained from Monte Carlo simulations of air showers in a realistic geo-magnetic field. We can clearly relate the time signal to the time dependence of the currents. We find that the the most important contribution to the pulse is related to the time variation of the currents. For showers forming a sufficiently large angle with the magnetic field, the contribution due to the currents induced by the geo-magnetic field is dominant, but neither the charge excess nor the dipole contribution can be neglected. We find a characteristic bipolar signal. In our calculations, we take into account a realistic index of refraction, whose importance depends on the impact parameter and the inclination. Also very important is the role of the positive ions.
[ { "version": "v1", "created": "Sat, 15 Dec 2007 18:17:11 GMT" } ]
2008-11-26T00:00:00
[ [ "Werner", "Klaus", "" ], [ "Scholten", "Olaf", "" ] ]
[ 0.0014281857, -0.0064203436, -0.0260059629, 0.0118799079, -0.0654888079, 0.1004404053, 0.0195401777, 0.0123992488, 0.034510158, -0.0244349595, -0.0507135764, 0.0916635543, -0.0357565768, -0.0594644584, 0.040638376, 0.0180990081, -0.0329781063, -0.0340427533, 0.0245518107, 0.0333156772, -0.0703186691, -0.0156451259, 0.0477533378, 0.0236169975, -0.0229808055, -0.0698512644, -0.0676700324, 0.0981033742, 0.071253486, 0.0420925282, 0.0269277915, -0.0270576272, -0.0951950699, -0.025759276, -0.1035564467, 0.0156970583, -0.072240226, 0.0555174723, -0.142506972, -0.0232404768, 0.0984669104, -0.043312978, -0.1136316434, 0.024421975, -0.1394947916, 0.0028141751, -0.040093068, -0.0625285655, 0.0578025691, -0.081069015, -0.028979186, 0.0817960873, -0.044896964, -0.0749408007, 0.0377820022, -0.0522196628, 0.0248374473, 0.0183327105, -0.0364836529, -0.1475964934, -0.0636191815, -0.0461953171, -0.053154476, -0.0060665435, -0.1007000729, 0.0288493503, 0.1120736226, 0.017164195, 0.099817194, -0.0053784177, 0.0248504318, -0.0603473373, 0.0552058704, -0.009977825, 0.0379118398, -0.0070110932, -0.0478831716, -0.0634114444, -0.0539594516, 0.08875525, 0.0451306663, -0.0139313024, -0.0327184349, -0.0357565768, -0.0226562191, 0.0518561229, 0.0406903103, 0.0287714507, -0.1073995605, 0.0249542985, -0.0332377777, 0.0492853895, -0.0628921017, -0.0081211831, -0.065852344, 0.0145155601, 0.0763949528, 0.0404046699, 0.142403096, -0.0086405231, 0.0668390915, -0.0056867758, 0.0779529735, -0.142506972, 0.1871702224, 0.0069851265, -0.0831983089, 0.0298360977, -0.0692280531, -0.0013251291, 0.0822634995, 0.0210332796, -0.0915596858, -0.060814742, -0.017527733, 0.0528688394, -0.0125096086, 0.0475456007, -0.0740059838, 0.0833021775, -0.0066670305, 0.0565042198, 0.0530506074, 0.0656965449, 0.1012194157, 0.0441958569, 0.0551539361, 0.0182288419, -0.0613340847, -0.0210592467, 0.1299389303, -0.1115542874, 0.0179821569, -0.0625805035, -0.0234352294, 0.0537517145, 0.0759275481, -0.0059042494, 0.0176186189, -0.0147362798, 0.0667871535, 0.1245377958, 0.0730711743, 0.0913519487, 0.0335753486, 0.0779010355, -0.0078290543, -0.0002205167, 0.0277847033, 0.0014070875, -0.0198128298, -0.0584257767, 0.0495190918, 0.089845866, 0.0787319839, -0.0948834643, 0.0644501224, 0.0788358524, -0.0587373823, -0.0473378636, -0.0128147211, 0.071253486, -0.0805496722, -0.0058360859, -0.0048785526, -0.0049596992, -0.0746811256, 0.0288753174, -0.0601396002, -0.1620341539, -0.0086340318, -0.0528948046, -0.059204787, -0.0202412866, 0.091040343, 0.0495969951, -0.0308488104, -0.0636711121, -0.0659042746, 0.0870933607, -0.0154893231, 0.0626843646, 0.0697993264, 0.0256943591, 0.1245377958, 0.0463511162, 0.0466627218, 0.044922933, -0.0473378636, -0.0813286826, -0.0107178846, 0.0319394246, 0.0539075173, 0.0878204331, -0.024603745, -0.0431831405, 0.0286156479, 0.0021017052, 0.0294725597, 0.1046470627, 0.0922867656, 0.0297841635, 0.0851718038, -0.1159167439, -0.0074525326, -0.079978399, 0.1188250482, -0.0376261994, -0.04598758, 0.0183327105, 0.1188250482, -0.0403527357, 0.0603473373, -0.0259150788, -0.1534131169, -0.095350869, 0.0512329154, -0.0103089036, 0.0212410167, -0.0465588532, 0.0093805837, 0.0951950699, 0.0160735808, 0.0786281154, -0.0342764556, 0.0748888627, 0.0876127034, -0.0056315958, 0.0384571441, -0.0003452801, -0.0519340262, 0.0346919298, 0.0153465047, -0.0649694651, -0.0179561898, -0.0125550507, 0.0397554971, -0.0341466218, -0.0121136112, -0.0656446069, 0.0319913588, 0.0698512644, -0.0087768501, 0.0913000181, -0.0411317497, 0.0201244354, -0.0730711743, -0.0456240401, 0.098622717, -0.0615418181, 0.0807054713, -0.0199037157, -0.0631517768, 0.028278077, 0.0224095322, 0.0650733337 ]
712.2518
Richard A. Klemm
Richard A. Klemm and Dmitri V. Efremov
Single-ion and exchange anisotropy effects and multiferroic behavior in high-symmetry tetramer single molecule magnets
30 pages, 14 figures, submitted to Phys. Rev. B
Phys. Rev. B 77, 184410 (2008).
10.1103/PhysRevB.77.184410
null
cond-mat.str-el cond-mat.mes-hall
null
We study single-ion and exchange anisotropy effects in equal-spin $s_1$ tetramer single molecule magnets exhibiting $T_d$, $D_{4h}$, $D_{2d}$, $C_{4h}$, $C_{4v}$, or $S_4$ ionic point group symmetry. We first write the group-invariant quadratic single-ion and symmetric anisotropic exchange Hamiltonians in the appropriate local coordinates. We then rewrite these local Hamiltonians in the molecular or laboratory representation, along with the Dzyaloshinskii-Moriay (DM) and isotropic Heisenberg, biquadratic, and three-center quartic Hamiltonians. Using our exact, compact forms for the single-ion spin matrix elements, we evaluate the eigenstate energies analytically to first order in the microscopic anisotropy interactions, corresponding to the strong exchange limit, and provide tables of simple formulas for the energies of the lowest four eigenstate manifolds of ferromagnetic (FM) and anitiferromagnetic (AFM) tetramers with arbitrary $s_1$. For AFM tetramers, we illustrate the first-order level-crossing inductions for $s_1=1/2,1,3/2$, and obtain a preliminary estimate of the microscopic parameters in a Ni$_4$ from a fit to magnetization data. Accurate analytic expressions for the thermodynamics, electron paramagnetic resonance absorption and inelastic neutron scattering cross-section are given, allowing for a determination of three of the microscopic anisotropy interactions from the second excited state manifold of FM tetramers. We also predict that tetramers with symmetries $S_4$ and $D_{2d}$ should exhibit both DM interactions and multiferroic states, and illustrate our predictions for $s_1=1/2, 1$.
[ { "version": "v1", "created": "Sat, 15 Dec 2007 15:21:12 GMT" }, { "version": "v2", "created": "Sat, 19 Jan 2008 18:21:42 GMT" } ]
2009-11-13T00:00:00
[ [ "Klemm", "Richard A.", "" ], [ "Efremov", "Dmitri V.", "" ] ]
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712.2519
Hiroyuki Abe
Hiroyuki Abe, Tatsuo Kobayashi, Yuji Omura
Metastable supersymmetry breaking vacua from conformal dynamics
12 pages, no figure
Phys.Rev.D77:065001,2008
10.1103/PhysRevD.77.065001
YITP-07-90, KUNS-2116
hep-ph hep-th
null
We study the scenario that conformal dynamics leads to metastable supersymmetry breaking vacua. At a high energy scale, the superpotential is not R-symmetric, and has a supersymmetric minimum. However, conformal dynamics suppresses several operators along renormalization group flow toward the infrared fixed point. Then we can find an approximately R-symmetric superpotential, which has a metastable supersymmetry breaking vacuum, and the supersymmetric vacuum moves far away from the metastable supersymmetry breaking vacuum. We show a 4D simple model. Furthermore, we can construct 5D models with the same behavior, because of the AdS/CFT dual.
[ { "version": "v1", "created": "Sat, 15 Dec 2007 15:35:41 GMT" }, { "version": "v2", "created": "Wed, 26 Dec 2007 13:32:08 GMT" } ]
2008-11-26T00:00:00
[ [ "Abe", "Hiroyuki", "" ], [ "Kobayashi", "Tatsuo", "" ], [ "Omura", "Yuji", "" ] ]
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712.252
Coel Hellier
Coel Hellier (Keele University)
Disc-Magnetosphere interactions in Cataclysmic Variable Stars
Invited review at IAU Symp. 243 (12 pages)
null
10.1017/S1743921307009684
null
astro-ph
null
I review, from an observational perspective, the interactions of accretion discs with magnetic fields in cataclysmic variable stars. I start with systems where the accretion flows via a stream, and discuss the circumstances in which the stream forms into an accretion disc, pointing to stars which are close to this transition. I then turn to disc-fed systems and discuss what we know about how material threads on to field lines, as deduced from the pattern of accretion footprints on the white dwarf. I discuss whether distortions of the field lines are related to accretion torques and the changing spin periods of the white dwarfs. I also review the effect on the disc-magnetosphere interaction of disc-instability outbursts. Lastly, I discuss the temporary, dynamo-driven magnetospheres thought to occur in dwarf-nova outbursts, and whether slow-moving waves are excited at the inner edges of the disc.
[ { "version": "v1", "created": "Sat, 15 Dec 2007 15:31:53 GMT" } ]
2009-11-13T00:00:00
[ [ "Hellier", "Coel", "", "Keele University" ] ]
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712.2521
Abouzeid Shalaby Dr.
Abouzeid M. Shalaby
Will the $PT$ Symmetric and Non-Hermitian $\phi^4$ Theory Solve the Hierarchy and Triviality Problems in the Standard Model?
11pages, 0 figures
null
null
null
hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Very recently, the Large Hadron Collider was turned on. There, the experiments are aiming to test different scenarios for elementary particles interactions from SUSY, Extra dimensions to others. In fact, SUSY was invented to kill the conceptual problems existing in the conventional Standard model \textit{i.e.} the Hierarchy problem. However, in recent years, certain theories which was rejected in the past like the wrong sign $\phi^{4}$ theory is now well known to be a truly physically acceptable theory. Here, we analyze the renormalization group flow of the different parameters in the theory. We find that, rather than the conventional $\phi^{4}$ theory and because the theory is asymptotically free, it does not sufferer from the catastrophic blow up of the mass parameter for UV scales. This feature greatly recommend that this theory is a plausible candidate to play the role of the $SU(2)\times U(1)$ symmetry breaking in the standard model. If this picture will agree with the experimental results from LHC, then the Higgs particle was massless in the far past. Moreover, the cosmological constant problem as a Hierarchy problem may be solved too. However, when trying to calculate the metric operator, we expected that the equivalent Hermitian theory may attain non-remormalizabe terms and thus the theory is incalculable. In fact, we show that there exists a Hermitian and renormalizable equivalent theory though of indefinite metric. We reformulated the Klein-Gordon equation in such a way that the wrong sign in the propagator attains a new physical meaning that the Higgs particle is made from exotic matter.
[ { "version": "v1", "created": "Sat, 15 Dec 2007 15:45:07 GMT" }, { "version": "v2", "created": "Sat, 18 Oct 2008 21:07:59 GMT" } ]
2008-10-19T00:00:00
[ [ "Shalaby", "Abouzeid M.", "" ] ]
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712.2522
Matteo Mariantoni
Matteo Mariantoni, Frank Deppe, A. Marx, R. Gross, F. K. Wilhelm, and E. Solano
Two-resonator circuit QED: A superconducting quantum switch
Published in Phys. Rev. B, major changes, 24 pages, 8 figures, REVTeX 4
Phys. Rev. B 78, 104508 (2008)
10.1103/PhysRevB.78.104508
null
cond-mat.mes-hall cond-mat.supr-con quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We introduce a systematic formalism for two-resonator circuit QED, where two on-chip microwave resonators are simultaneously coupled to one superconducting qubit. Within this framework, we demonstrate that the qubit can function as a quantum switch between the two resonators, which are assumed to be originally independent. In this three-circuit network, the qubit mediates a geometric second-order circuit interaction between the otherwise decoupled resonators. In the dispersive regime, it also gives rise to a dynamic second-order perturbative interaction. The geometric and dynamic coupling strengths can be tuned to be equal, thus permitting to switch on and off the interaction between the two resonators via a qubit population inversion or a shifting of the qubit operation point. We also show that our quantum switch represents a flexible architecture for the manipulation and generation of nonclassical microwave field states as well as the creation of controlled multipartite entanglement in circuit QED. In addition, we clarify the role played by the geometric interaction, which constitutes a fundamental property characteristic of superconducting quantum circuits without counterpart in quantum-optical systems. We develop a detailed theory of the geometric second-order coupling by means of circuit transformations for superconducting charge and flux qubits. Furthermore, we show the robustness of the quantum switch operation with respect to decoherence mechanisms. Finally, we propose a realistic design for a two-resonator circuit QED setup based on a flux qubit and estimate all the related parameters. In this manner, we show that this setup can be used to implement a superconducting quantum switch with available technology.
[ { "version": "v1", "created": "Sat, 15 Dec 2007 15:47:05 GMT" }, { "version": "v2", "created": "Thu, 11 Sep 2008 09:37:38 GMT" }, { "version": "v3", "created": "Tue, 23 Sep 2008 07:28:10 GMT" } ]
2008-09-23T00:00:00
[ [ "Mariantoni", "Matteo", "" ], [ "Deppe", "Frank", "" ], [ "Marx", "A.", "" ], [ "Gross", "R.", "" ], [ "Wilhelm", "F. K.", "" ], [ "Solano", "E.", "" ] ]
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712.2523
Warren G. Anderson
Warren G. Anderson and Jolien D. E. Creighton
Searches for Gravitational Waves from Binary Neutron Stars: A Review
30 pages, 5 Figures, to appear in "Short-Period Binary Stars: Observations, Analyses, and Results", Ed.s Eugene F. Milone, Denis A. Leahy, David W. Hobill
null
10.1007/978-1-4020-6544-6_2
null
gr-qc
null
A new generation of observatories is looking for gravitational waves. These waves, emitted by highly relativistic systems, will open a new window for ob- servation of the cosmos when they are detected. Among the most promising sources of gravitational waves for these observatories are compact binaries in the final min- utes before coalescence. In this article, we review in brief interferometric searches for gravitational waves emitted by neutron star binaries, including the theory, instru- mentation and methods. No detections have been made to date. However, the best direct observational limits on coalescence rates have been set, and instrumentation and analysis methods continue to be refined toward the ultimate goal of defining the new field of gravitational wave astronomy.
[ { "version": "v1", "created": "Sat, 15 Dec 2007 15:51:21 GMT" } ]
2015-11-11T00:00:00
[ [ "Anderson", "Warren G.", "" ], [ "Creighton", "Jolien D. E.", "" ] ]
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712.2524
Teodor Banica
Teodor Banica
Cyclotomic expansion of exceptional spectral measures
23 pages
Internat. J. Math. 20 (2009), 275-297
null
null
math.QA
null
We find explicit formulae for the circular spectral measures of $E_7,E_8$. This leads to a number of general observations regarding the ADE circular measures: these are linear combinations of measures supported by the roots of unity, with real density given by certain degree 3 polynomials.
[ { "version": "v1", "created": "Sat, 15 Dec 2007 15:58:28 GMT" }, { "version": "v2", "created": "Tue, 15 Jan 2008 12:59:59 GMT" } ]
2009-03-29T00:00:00
[ [ "Banica", "Teodor", "" ] ]
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712.2525
Robert Frank Carslaw Walters
R. Rosebrugh, N. Sabadini, R.F.C. Walters
Calculating Colimits Compositionally
null
null
null
null
math.CT
null
We show how finite limits and colimits can be calculated compositionally using the algebras of spans and cospans, and give as an application a proof of the Kleene Theorem on regular languages.
[ { "version": "v1", "created": "Sat, 15 Dec 2007 16:03:00 GMT" } ]
2007-12-18T00:00:00
[ [ "Rosebrugh", "R.", "" ], [ "Sabadini", "N.", "" ], [ "Walters", "R. F. C.", "" ] ]
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712.2526
Jon McAuliffe
Michael Braun and Jon McAuliffe
Variational inference for large-scale models of discrete choice
29 pages, 2 tables, 2 figures
Journal of the American Statistical Association (2010) 105(489): 324-334
10.1198/jasa.2009.tm08030
null
stat.ME stat.CO stat.ML
null
Discrete choice models are commonly used by applied statisticians in numerous fields, such as marketing, economics, finance, and operations research. When agents in discrete choice models are assumed to have differing preferences, exact inference is often intractable. Markov chain Monte Carlo techniques make approximate inference possible, but the computational cost is prohibitive on the large data sets now becoming routinely available. Variational methods provide a deterministic alternative for approximation of the posterior distribution. We derive variational procedures for empirical Bayes and fully Bayesian inference in the mixed multinomial logit model of discrete choice. The algorithms require only that we solve a sequence of unconstrained optimization problems, which are shown to be convex. Extensive simulations demonstrate that variational methods achieve accuracy competitive with Markov chain Monte Carlo, at a small fraction of the computational cost. Thus, variational methods permit inferences on data sets that otherwise could not be analyzed without bias-inducing modifications to the underlying model.
[ { "version": "v1", "created": "Sat, 15 Dec 2007 16:16:18 GMT" }, { "version": "v2", "created": "Fri, 21 Dec 2007 18:46:25 GMT" }, { "version": "v3", "created": "Tue, 15 Jan 2008 18:03:40 GMT" } ]
2010-06-04T00:00:00
[ [ "Braun", "Michael", "" ], [ "McAuliffe", "Jon", "" ] ]
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712.2527
Giorgio Ottaviani
Giorgio Ottaviani
An invariant regarding Waring's problem for cubic polynomials
11 pages
null
null
null
math.AG
null
We compute the equation of the 7-secant variety to the Veronese variety (P^4,O(3)), its degree is 15. This is the last missing invariant in the Alexander-Hirschowitz classification. It gives the condition to express a homogeneous cubic polynomial in 5 variables as the sum of 7 cubes (Waring problem). The interesting side in the construction is that it comes from the determinant of a matrix of order 45 with linear entries, which is a cube. The same technique allows to express the classical Aronhold invariantof plane cubics as a pfaffian.
[ { "version": "v1", "created": "Sat, 15 Dec 2007 17:43:34 GMT" } ]
2007-12-18T00:00:00
[ [ "Ottaviani", "Giorgio", "" ] ]
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712.2528
Xiaobing Feng Dr.
John W. Barrett, Xiaobing Feng, and Andreas Prohl
On $p$-harmonic map heat flows for {$1\leq p< \infty$} and their finite element approximations
27 pages
null
null
null
math.AP math.NA
null
Motivated by emerging applications from imaging processing, the heat flow of a generalized $p$-harmonic map into spheres is studied for the whole spectrum, $1\leq p<\infty$, in a unified framework. The existence of global weak solutions is established for the flow using the energy method together with a regularization and a penalization technique. In particular, a $BV$-solution concept is introduced and the existence of such a solution is proved for the 1-harmonic map heat flow. The main idea used to develop such a theory is to exploit the properties of measures of the forms $\cA\cdot\nab\bv$ and $\cA\wedge\nab\bv$; which pair a divergence-$L^1$, or a divergence-measure, tensor field $\cA$, and a $BV$-vector field $\bv$. Based on these analytical results, a practical fully discrete finite element method is then proposed for approximating weak solutions of the $p$-harmonic map heat flow, and the convergence of the proposed numerical method is also established.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 16:17:12 GMT" } ]
2007-12-18T00:00:00
[ [ "Barrett", "John W.", "" ], [ "Feng", "Xiaobing", "" ], [ "Prohl", "Andreas", "" ] ]
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712.2529
David A. Kessler
Isaac Freund and David A. Kessler
Singularities in Speckled Speckle
null
null
10.1364/OL.33.000479
null
physics.optics
null
Speckle patterns produced by random optical fields with two (or more) widely different correlation lengths exhibit speckle spots that are themselves highly speckled. Using computer simulations and analytic theory we present results for the point singularities of speckled speckle fields: optical vortices in scalar (one polarization component) fields; C points in vector (two polarization component) fields. In single correlation length fields both types of singularities tend to be more{}-or{}-less uniformly distributed. In contrast, the singularity structure of speckled speckle is anomalous: for some sets of source parameters vortices and C points tend to form widely separated giant clusters, for other parameter sets these singularities tend to form chains that surround large empty regions. The critical point statistics of speckled speckle is also anomalous. In scalar (vector) single correlation length fields phase (azimuthal) extrema are always outnumbered by vortices (C points). In contrast, in speckled speckle fields, phase extrema can outnumber vortices, and azimuthal extrema can outnumber C points, by factors that can easily exceed $10^{4}$ for experimentally realistic source parameters.
[ { "version": "v1", "created": "Sat, 15 Dec 2007 18:23:01 GMT" } ]
2009-11-13T00:00:00
[ [ "Freund", "Isaac", "" ], [ "Kessler", "David A.", "" ] ]
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712.253
Nick Herbert
Nick Herbert
Entanglement Telegraphed Communication Avoiding Light-speed Limitation by Hong Ou Mandel Effect
6 pages, 5 figures, 4 tables. Scheme refuted by Lev Vaidman
null
null
null
physics.gen-ph
null
Faster-than-light communication is possible via quantum entanglement in an EPR experiment if one can overcome nature's "quantum modesty" and gain knowledge concerning the quantum state of a single photon. Using a special EPR source that produces precisely timed doublets of EPR photons (biphotons), I show how one can gain additional information about the photon's polarization state--information not accessible using the conventional one-photon-at-a-time EPR setup. Using the Hong-Ou-Mandel effect that describes how two identical photons combine at a neutral beamsplitter (NBS), I show how Bob can obtain enough polarization information about his B photons to unambiguously ascertain the polarization basis of Alice's distant measurement device which she has deployed to measure her A photons. I am proposing, in short, that EPR + HOM = FTL. Version 2 concludes with a refutation of its FTL claim due to Lev Vaidman.
[ { "version": "v1", "created": "Sat, 15 Dec 2007 19:34:13 GMT" }, { "version": "v2", "created": "Wed, 19 Dec 2007 17:33:09 GMT" } ]
2007-12-19T00:00:00
[ [ "Herbert", "Nick", "" ] ]
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712.2531
Luca Maragliano
Luca Maragliano, Eric Vanden-Eijnden
Single-Sweep Methods for Free Energy Calculations
null
null
10.1063/1.2907241
null
physics.comp-ph physics.chem-ph
null
A simple, efficient, and accurate method is proposed to map multi-dimensional free energy landscapes. The method combines the temperature-accelerated molecular dynamics (TAMD) proposed in [Maragliano & Vanden-Eijnden, Chem. Phys. Lett. 426, 168 (2006)] with a variational reconstruction method using radial-basis functions for the representation of the free energy. TAMD is used to rapidly sweep through the important regions of the free energy landscape and compute the gradient of the free energy locally at points in these regions. The variational method is then used to reconstruct the free energy globally from the mean force at these points. The algorithmic aspects of the single-sweep method are explained in detail, and the method is tested on simple examples, compared to metadynamics, and finally used to compute the free energy of the solvated alanine dipeptide in two and four dihedral angles.
[ { "version": "v1", "created": "Sat, 15 Dec 2007 21:09:18 GMT" } ]
2009-11-13T00:00:00
[ [ "Maragliano", "Luca", "" ], [ "Vanden-Eijnden", "Eric", "" ] ]
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712.2532
Simon Catterall
Simon Catterall
From Twisted Supersymmetry to Orbifold Lattices
15 pages
JHEP 0801:048,2008
10.1088/1126-6708/2008/01/048
null
hep-th hep-lat
null
We show how to derive the supersymmetric orbifold lattices of Cohen et al. \cite{Cohen:2003xe,Cohen:2003qw} and Kaplan et al. \cite{Kaplan:2005ta} by direct discretization of an appropriate twisted supersymmetric Yang-Mills theory. We examine in detail the four supercharge two dimensional theory and the theory with sixteen supercharges in four dimensions. The continuum limit of the latter theory is the well known Marcus twist of ${\cal N}=4$ Yang-Mills. The lattice models are gauge invariant and possess one exact supersymmetry at non-zero lattice spacing.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 13:56:10 GMT" } ]
2009-12-15T00:00:00
[ [ "Catterall", "Simon", "" ] ]
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712.2533
Thomas Kragh
Thomas Kragh
The Viterbo Transfer as a Map of Spectra
100 pages, 10 figures. Written in PDFLatex. The third version is an extensive rewrite of the second (including a correction of a small error on the bound of r in the new Proposition 10.1 - this appeared in the second version - but not the first version). The second version is an extensive rewrite of the first
null
null
null
math.AT math.SG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Let $L$ and $N$ be two smooth manifolds of the same dimension. Let $j\colon L\to T^*N$ be an exact Lagrange embedding. We denote the free loop space of $X$ by $\Lambda X$. C. Viterbo constructed a transfer map $(\Lambda j)^! \colon H^*(\Lambda L) \to H^*(\Lambda N)$. This transfer was constructed using finite dimensional approximation of Floer homology. In this paper we define a family of finite dimensional approximations and realize this transfer as a map of Thom spectra: $(\Lambda j)_! \colon (\Lambda N)^{-TN} \to (\Lambda L)^{-TL+\eta}$, where $\eta$ is a virtual vector bundle classified by the tangential information of $j$.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 16:26:59 GMT" }, { "version": "v2", "created": "Tue, 21 Feb 2012 20:15:56 GMT" }, { "version": "v3", "created": "Fri, 5 Dec 2014 17:05:07 GMT" } ]
2014-12-08T00:00:00
[ [ "Kragh", "Thomas", "" ] ]
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712.2534
Conor Henderson
CDF Collaboration
Model-Independent Global Search for New High-pT Physics at CDF
7 pages. Submitted to Physical Review Letters
null
null
null
hep-ex
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Data collected in Run II of the Fermilab Tevatron are searched for indications of new electroweak scale physics. Rather than focusing on particular new physics scenarios, CDF data are analyzed for discrepancies with respect to the standard model prediction. A model-independent approach (Vista) considers the gross features of the data, and is sensitive to new large cross section physics. A quasi-model-independent approach (Sleuth) searches for a significant excess of events with large summed transverse momentum, and is particularly sensitive to new electroweak scale physics that appears predominantly in one final state. This global search for new physics in over three hundred exclusive final states in 927 pb^-1 of ppbar collisions at sqrt(s)=1.96 TeV reveals no such significant indication of physics beyond the standard model.
[ { "version": "v1", "created": "Sat, 15 Dec 2007 20:17:55 GMT" }, { "version": "v2", "created": "Sun, 13 Jul 2008 18:26:43 GMT" } ]
2012-08-27T00:00:00
[ [ "CDF Collaboration", "", "" ] ]
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712.2535
Olga Melnyk
O. V. Melnyk, I. B. Vavilova
Galaxy Triplets of the Local Supercluster. 3. Configuration Properties
11 pages
KinematikaFiz.NebesnykhTel.22:422-431,2006
null
null
astro-ph
null
Configuration properties of observed galaxy triplets are studied with the use of the method of configuration parameters and Agekian-Anosova configuration diagram. Statistically significant excess of the hierarchical configurations for the galaxy triplets of the Local Supercluster (LS) is established. The samples of the Interacting, Northern and Southern galaxy triplets do not demonstrate the same excess. Our results testify that the model of the dark matter concentrated in the halo of individual galaxies is convenient for dynamically young systems to which the most of LS triplets belong, whereas the model of the dark matter concentrated in the triplet's volume is more convenient for the compact triplets.
[ { "version": "v1", "created": "Sat, 15 Dec 2007 20:45:35 GMT" } ]
2008-11-26T00:00:00
[ [ "Melnyk", "O. V.", "" ], [ "Vavilova", "I. B.", "" ] ]
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712.2536
Massimo Stiavelli
Massimo Stiavelli
Observational Cosmology with the ELT and JWST
5 pages, 2 figures, proceedings of the conference "Science with the VLT in the ELT era"
null
null
null
astro-ph
null
I will focus on the study of the Cosmic Dark ages and in particular on the properties of the galaxies responsible for the reionization of Hydrogen and on the possibility of detecting the first generation of galaxies and the first stars. I will make the case that there is a large and widening gap between our present and future capabilities in imaging and what we can follow-up spectroscopically even with the NIRSpec spectrograph on the James Webb Space Telescope because of its moderate field of view. A high throughput, high multiplexing near-IR spectrometer on the Extremely Large Telescope would be important to contain this gap. Studying the Lyman alpha forest of QSOs at z>=7 and measuring the kinematics of small mass galaxies at high-z are also problems unsuited to JWST and where a high-throughput, medium-high resolution near-IR spectrograph on the ELT would be essential.
[ { "version": "v1", "created": "Sat, 15 Dec 2007 21:05:39 GMT" } ]
2007-12-18T00:00:00
[ [ "Stiavelli", "Massimo", "" ] ]
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712.2537
Uwe Nagel
Uwe Nagel, Victor Reiner
Betti numbers of monomial ideals and shifted skew shapes
null
null
null
null
math.AC math.CO
null
We present two new problems on lower bounds for resolution Betti numbers of monomial ideals generated in a fixed degree. The first concerns any such ideal and bounds the total Betti numbers, while the second concerns ideals that are quadratic and bihomogeneous with respect to two variable sets, but gives a more finely graded lower bound. These problems are solved for certain classes of ideals that generalize (in two different directions) the edge ideals of threshold graphs and Ferrers graphs. In the process, we produce particularly simple cellular linear resolutions for strongly stable and squarefree strongly stable ideals generated in a fixed degree, and combinatorial interpretations for the Betti numbers of other classes of ideals, all of which are independent of the coefficient field.
[ { "version": "v1", "created": "Sat, 15 Dec 2007 21:35:24 GMT" } ]
2007-12-18T00:00:00
[ [ "Nagel", "Uwe", "" ], [ "Reiner", "Victor", "" ] ]
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712.2538
Christian Arthur Rudolf Beck
C. Beck (1 and 2), W. Schmidt (2), R. Rezaei (2), W. Rammacher (2) ((1) Instituto de Astrofisica de Canarias (2) Kiepenheuer-Institut fuer Sonnenphysik)
The signature of chromospheric heating in Ca II H spectra
19 pages, 28 figures, accepted by A&A
2008A&A...479..213B
10.1051/0004-6361:20078410
null
astro-ph
null
We analyze a 1-hour time series of Ca II H intensity spectra and polarimetric spectra around 630 nm to derive the signature of the chromospheric heating and to investigate its relation to magnetic fields. We derived several characteristic quantities of Ca II H to define the chromospheric atmosphere properties. We study the power of the Fourier transform at different wavelengths and their phase relations. We perform local thermodynamic equilibrium inversions of the data to obtain the magnetic field, once including the Ca spectra. We find that the emission in the Ca II H line core at locations without detectable photospheric polarization signal is due to waves that propagate from low forming continuum layers in the line wing up to the line core. The phase differences of intensity oscillations at different wavelengths indicate standing waves for v < 2 mHz and propagating waves for higher frequencies. The waves steepen into shocks in the chromosphere. On average, shocks are both preceded and followed by intensity reductions. In field-free regions, the profiles show emission about half of the time. The correlation between wavelengths and the decorrelation time is significantly higher in the presence of magnetic fields than for field-free areas. The average Ca II H profile in the presence of magnetic fields contains emission features symmetric to the line core and an asymmetric contribution, where mainly the blue H2V emission peak is increased. We find that acoustic waves steepening into shocks are responsible for the emission in the Ca II H line core for locations without photospheric magnetic fields. We suggest using wavelengths in the line wing of Ca II H, where LTE still applies, to compare theoretical heating models with observations.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 18:44:56 GMT" } ]
2008-02-08T00:00:00
[ [ "Beck", "C.", "", "1 and 2" ], [ "Schmidt", "W.", "" ], [ "Rezaei", "R.", "" ], [ "Rammacher", "W.", "" ] ]
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712.2539
Andrea Rapisarda
Alessandro Pluchino and Andrea Rapisarda
Nonergodicity and central limit behavior for systems with long-range interactions
7 pages, 5 figures, paper presented at the International SPIE Conference on Complex Systems, 5-7 December 2007, Canberra, Australia, http://spie.org/x12360.xml
null
10.1117/12.772041
null
cond-mat.stat-mech astro-ph nucl-th physics.plasm-ph
null
In this paper we discuss the nonergodic behavior for a class of long-standing quasi-stationary states in a paradigmatic model of long-range interacting systems, i.e. the HMF model. We show that ensemble averages and time averages for velocities probability density functions (pdfs) do not coincide and in particular the latter exhibit a tendency to converge towards a q-Gaussian attractor instead of the usual Gaussian one predicted by the Central Limit Theorem, when ergodicity applies.
[ { "version": "v1", "created": "Sat, 15 Dec 2007 22:45:17 GMT" } ]
2009-11-13T00:00:00
[ [ "Pluchino", "Alessandro", "" ], [ "Rapisarda", "Andrea", "" ] ]
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712.254
Francesca Valsecchi Miss
Vassiliki Kalogera, Francesca Valsecchi and Bart Willems
Neutron Stars: Formed, Spun and Kicked
9 pages,4 figures, proceedings paper for 40 Years of Pulsars Conference
AIPConf.Proc.983:433-441,2008
10.1063/1.2900269
null
astro-ph
null
One of the primary goals when studying stellar systems with neutron stars has been to reveal the physical properties of progenitors and understand how neutron star spins and birth kicks are determined. Over the years a consensus understanding had been developed, but recently some of the basic elements of this understanding are being challenged by current observations of some binary systems and their theoretical interpretation. In what follows we review such recent developments and highlight how they are interconnected; we particularly emphasize some of the assumptions and caveats of theoretical interpretations and examine their validity (e.g., in connection to the unknown radial velocities of pulsars or the nuances of multi-dimensional statistical analysis). The emerging picture does not erase our earlier understanding; instead it broadens it as it reveals additional pathways for neutron star formation and evolution: neutron stars probably form at the end of both core collapse of Fe cores of massive stars and electron-capture supernovae of ONeMg cores of lower-mass stars; birth kicks are required to be high (well in excess of 100 km/s) for some neutron stars and low (< 100 km/s) for others depending on the formation process; and spin up may occur not just through Roche-lobe overflow but also through wind accretion or phases of hypercritical accretion during common envelope evolution.
[ { "version": "v1", "created": "Sat, 15 Dec 2007 22:41:11 GMT" } ]
2008-11-26T00:00:00
[ [ "Kalogera", "Vassiliki", "" ], [ "Valsecchi", "Francesca", "" ], [ "Willems", "Bart", "" ] ]
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712.2541
Michael Reisenberger
Michael P. Reisenberger
The Poisson bracket on free null initial data for gravity
4 pages,1 figure. Some changes to text to improve clarity of presentation, this is the final published version
Phys.Rev.Lett.101:211101,2008
10.1103/PhysRevLett.101.211101
null
gr-qc
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Free initial data for general relativity on a pair of intersecting null hypersurfaces are well known, but the lack of a Poisson bracket and concerns about caustics have stymied the development of a constraint free canonical theory. Here it is pointed out how caustics and generator crossings can be neatly avoided and a Poisson bracket on free data is given. On sufficiently regular functions of the solution spacetime geometry this bracket matches the Poisson bracket defined on such functions by the Hilbert action via Peierls' prescription. The symplectic form is also given in terms of free data.
[ { "version": "v1", "created": "Sat, 15 Dec 2007 22:18:55 GMT" }, { "version": "v2", "created": "Tue, 18 Dec 2007 17:33:22 GMT" }, { "version": "v3", "created": "Thu, 26 Jun 2008 16:10:17 GMT" }, { "version": "v4", "created": "Fri, 26 Jun 2009 14:50:27 GMT" } ]
2009-06-26T00:00:00
[ [ "Reisenberger", "Michael P.", "" ] ]
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712.2542
Lee Samuel Finn
Stephon Alexander, Lee Samuel Finn, Nicolas Yunes
A gravitational-wave probe of effective quantum gravity
14 pages, no figures, submitted to Phys. Rev. D
Phys.Rev.D78:066005,2008
10.1103/PhysRevD.78.066005
IGC-07/12-2
gr-qc
null
The Green-Schwarz anomaly-cancelling mechanism in string theories requires a Chern-Simons term in the Einstein-Hilbert action, which leads to an amplitude birefringence of spacetime for the propagation of gravitational waves. While the degree of birefringence may be intrinsically small, its effects on a gravitational wave will accumulate as the wave propagates. The proposed Laser Interferometer Space Antenna (LISA) will be sensitive enough to observe the gravitational waves from sources at cosmological distances great enough that interesting bounds on the Chern-Simons may be found. Here we evaluate the effect of a Chern-Simons induced spacetime birefringence to the propagation of gravitational waves from such systems. We find that gravitational waves from in coalescing binary black hole system are imprinted with a signature of Chern-Simons gravity. This signature appears as a time-dependent change in the apparent orientation of the binary's orbital angular momentum with respect to the observer line-of-sight, with the change magnitude reflecting the integrated history of the Chern-Simons coupling over the worldline of a radiation wavefront. While spin-orbit coupling in the binary system will also lead to an evolution of the system's orbital angular momentum, the time dependence and other details of this \emph{real} effect are different than the \emph{apparent} effect produced by Chern-Simons birefringence, allowing the two effects to be separately identified.
[ { "version": "v1", "created": "Sat, 15 Dec 2007 22:40:16 GMT" } ]
2009-02-20T00:00:00
[ [ "Alexander", "Stephon", "" ], [ "Finn", "Lee Samuel", "" ], [ "Yunes", "Nicolas", "" ] ]
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712.2543
Wei Liu
Wei Liu
Magnetized Ekman Layer and Stewartson Layer in a Magnetized Taylor-Couette Flow
24 pages, 12 figures, accepted by PRE, revision according to referees
null
10.1103/PhysRevE.77.056314
null
physics.flu-dyn astro-ph physics.plasm-ph
null
In this paper we present axisymmetric nonlinear simulations of magnetized Ekman and Stewartson layers in a magnetized Taylor-Couette flow with a centrifugally stable angular-momemtum profile and with a magnetic Reynolds number below the threshold of magnetorotational instability. The magnetic field is found to inhibit the Ekman suction. The width of the Ekman layer is reduced with increased magnetic field normal to the end plate. A uniformly-rotating region forms near the outer cylinder. A strong magnetic field leads to a steady Stewartson layer emanating from the junction between differentially rotating rings at the endcaps. The Stewartson layer becomes thinner with larger Reynolds number and penetrates deeper into the bulk flow with stronger magnetic field and larger Reynolds number. However, at Reynolds number larger than a critical value $\sim 600$, axisymmetric, and perhaps also nonaxisymmetric, instabilities occur and result in a less prominent Stewartson layer that extends less far from the boundary.
[ { "version": "v1", "created": "Sat, 15 Dec 2007 22:49:57 GMT" }, { "version": "v2", "created": "Sat, 26 Apr 2008 21:26:23 GMT" } ]
2009-11-13T00:00:00
[ [ "Liu", "Wei", "" ] ]
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712.2544
Iain Hannah
I. G. Hannah, S. Christe, S. Krucker, G. J. Hurford, H. S. Hudson, R. P. Lin
RHESSI Microflare Statistics II. X-ray Imaging, Spectroscopy & Energy Distributions
17 pages, 21 figs, ApJ
null
10.1086/529012
null
astro-ph
null
We present X-ray imaging and spectral analysis of all microflares the Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI) observed between March 2002 and March 2007, a total of 25,705 events. These microflares are small flares, from low GOES C Class to below A Class (background subtracted) and are associated with active regions. They were found by searching the 6-12 keV energy range during periods when the full sensitivity of RHESSI's detectors was available (see paper I). Each microflare is automatically analyzed at the peak time of the 6-12 keV emission: the thermal source size is found by forward-fitting the complex visibilities for 4-8 keV, and the spectral parameters (temperature, emission measure, power-law index) are found by forward fitting a thermal plus non-thermal model. The combination of these parameters allows us to present the first statistical analysis of the thermal and non-thermal energy at the peak times of microflares.
[ { "version": "v1", "created": "Sat, 15 Dec 2007 23:37:58 GMT" } ]
2008-02-28T00:00:00
[ [ "Hannah", "I. G.", "" ], [ "Christe", "S.", "" ], [ "Krucker", "S.", "" ], [ "Hurford", "G. J.", "" ], [ "Hudson", "H. S.", "" ], [ "Lin", "R. P.", "" ] ]
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712.2545
Thomas Watson
Dieter van Melkebeek and Thomas Watson
A Quantum Time-Space Lower Bound for the Counting Hierarchy
25 pages
null
null
null
quant-ph
null
We obtain the first nontrivial time-space lower bound for quantum algorithms solving problems related to satisfiability. Our bound applies to MajSAT and MajMajSAT, which are complete problems for the first and second levels of the counting hierarchy, respectively. We prove that for every real d and every positive real epsilon there exists a real c>1 such that either: MajMajSAT does not have a quantum algorithm with bounded two-sided error that runs in time n^c, or MajSAT does not have a quantum algorithm with bounded two-sided error that runs in time n^d and space n^{1-\epsilon}. In particular, MajMajSAT cannot be solved by a quantum algorithm with bounded two-sided error running in time n^{1+o(1)} and space n^{1-\epsilon} for any epsilon>0. The key technical novelty is a time- and space-efficient simulation of quantum computations with intermediate measurements by probabilistic machines with unbounded error. We also develop a model that is particularly suitable for the study of general quantum computations with simultaneous time and space bounds. However, our arguments hold for any reasonable uniform model of quantum computation.
[ { "version": "v1", "created": "Sat, 15 Dec 2007 23:58:17 GMT" } ]
2007-12-18T00:00:00
[ [ "van Melkebeek", "Dieter", "" ], [ "Watson", "Thomas", "" ] ]
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712.2546
Louis H. Kauffman
Louis H. Kauffman
An Extended Bracket Polynomial for Virtual Knots and Links
60 pages, 55 figures, LaTeX document
null
null
null
math.GT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper defines a new invariant of virtual knots and links that we call the extended bracket polynomial, and denote by <<K>> for a virtual knot or link K. This invariant is a state summation over bracket states of the oriented diagram for K. Each state is reduced to a virtual 4-regular graph in the plane and the polynomial takes values in the module generated by these reduced graphs over the ring Q[A,A^{-1}]. The paper is relatively self-contained, with background information about virtual knots and long virtual knots. We give numerous examples applying the extended bracket, including a new proof of the non-triviality of the Kishino diagram and the flat Kishino diagram and non-classicality of single crossing virtualizations. The paper has a section on the estimation of virtual crossing number using the extended bracket state sum. Examples are given of virtual knots with arbitrary minimal embedding genus and arbitrarily high positive difference between the virtual crossing number and the minimal embedding genus. A simplification of <<K>> is introduced and denoted by A[K]. This simplified extended bracket, the arrow polynomial, is a polynomial in an infinite set of variables. It is quite strong (detecting the flat Kishino diagram for example) and easily computable. The paper contains a description of a computer algorithm for A[K] and uses the arrow polynomial, in conjunction with the extended bracket polynomial to determine the minimum genus surfaces on which some virtual knots can be represented.
[ { "version": "v1", "created": "Sat, 15 Dec 2007 23:59:28 GMT" }, { "version": "v2", "created": "Sat, 29 Dec 2007 08:56:37 GMT" }, { "version": "v3", "created": "Tue, 22 Apr 2008 06:07:20 GMT" }, { "version": "v4", "created": "Sun, 5 Oct 2008 06:20:26 GMT" }, { "version": "v5", "created": "Thu, 23 Apr 2009 05:42:50 GMT" } ]
2009-04-23T00:00:00
[ [ "Kauffman", "Louis H.", "" ] ]
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712.2547
Tijmen Euser
T. G. Euser, J. S. Y. Chen, N. J. Farrer, M. Scharrer, P. J. Sadler, P. St.J. Russell
Quantitative broadband chemical sensing in air-suspended solid-core fibers
null
J. Appl. Phys. 103, 103108 (2008)
10.1063/1.2924408
null
physics.optics
null
We demonstrate a quantitative broadband fiber sensor, based on evanescent field sensing in the cladding holes of an air-suspended solid-core photonic crystal fiber. We discuss the fabrication process, together with the structural- and optical characterization of a range of different fibers. Measured mode profiles are in good agreement with finite element method calculations made without free parameters. The fraction of the light in the hollow cladding can be tuned via the core diameter of the fiber. Dispersion measurements are in excellent agreement with theory and demonstrate tuning of the zero dispersion wavelength via the core diameter. Optimum design parameters for absorption sensors are discussed using a general parameter diagram. From our analysis, we estimate that a sensitivity increase of three orders of magnitude is feasible compared to standard cuvette measurements. Our study applies to both liquid and gas fiber sensors. We demonstrate the applicability of our results to liquid chemical sensing by measuring the broad absorption peak of an aqueous nickel chloride solution. We find striking agreement with the reference spectrum measured in a standard cuvette, even though the sample volume has decreased by three orders of magnitude. Our results demonstrate that air-suspended solid-core PCFs can be used in quantitative broadband chemical sensing measurements.
[ { "version": "v1", "created": "Sun, 16 Dec 2007 00:07:19 GMT" } ]
2008-07-24T00:00:00
[ [ "Euser", "T. G.", "" ], [ "Chen", "J. S. Y.", "" ], [ "Farrer", "N. J.", "" ], [ "Scharrer", "M.", "" ], [ "Sadler", "P. J.", "" ], [ "Russell", "P. St. J.", "" ] ]
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712.2548
Juan Manuel Borrero
J.M. Borrero, B.W. Lites, S.K. Solanki
Evidence of magnetic field wrapping around penumbral filaments
4 pages, 3 figures (2 color); accepted for publication in A&A Letters. Special number of Hinode
null
10.1051/0004-6361:20079002
null
astro-ph
null
We employ high-spatial resolution spectropolarimetric observations from the Solar Optical Telescope on-board the Hinode spacecraft to investigate the fine structure of the penumbral magnetic fields. The Stokes vector of two neutral iron lines at 630 nm is inverted at every spatial pixel to retrieve the depth-dependence of the magnetic field vector, line-of-sight velocity and thermodynamic parameters. We show that the azimuthal angle of the magnetic field vector has opposite sign on both sides above the penumbral filaments. This is consistent with the wrapping of an inclined field around the horizontal filaments. The wrapping effect is stronger for filaments with larger horizontal extensions. In addition, we find that the external magnetic field can penetrate into the intraspines, leading to non-radial magnetic fields inside them. These findings shed some light on the controversial small-scale structure of the sunspot penumbra.
[ { "version": "v1", "created": "Sun, 16 Dec 2007 00:14:09 GMT" } ]
2009-11-13T00:00:00
[ [ "Borrero", "J. M.", "" ], [ "Lites", "B. W.", "" ], [ "Solanki", "S. K.", "" ] ]
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712.2549
Jun Zhang
James J. Zhang, Jun Zhang
Double Ore Extensions
null
null
null
null
math.RA
null
A double Ore extension is a natural generalization of the Ore extension. We prove that a connected graded double Ore extension of an Artin-Schelter regular algebra is Artin-Schelter regular. Some other basic properties such as the determinant of the DE-data are studied. Using the double Ore extension, we construct 26 families of Artin-Schelter regular algebras of global dimension four in a sequel paper.
[ { "version": "v1", "created": "Sun, 16 Dec 2007 00:32:31 GMT" } ]
2007-12-18T00:00:00
[ [ "Zhang", "James J.", "" ], [ "Zhang", "Jun", "" ] ]
[ 0.0377307273, -0.0471158065, 0.0135471541, 0.0196270514, -0.0367514156, 0.1042423621, 0.0017010452, -0.0437426195, -0.0586499274, -0.0968431085, 0.0604453348, -0.0840032399, -0.0615334585, 0.0196406525, 0.0749718025, 0.1290516108, 0.0200895052, -0.01411842, 0.0635464936, 0.0888997987, -0.0465445407, -0.0453476012, 0.1064186096, -0.0822622404, 0.0301138554, -0.0639273301, 0.0741557106, 0.0361801498, 0.04907443, -0.0079161078, 0.0461092889, -0.056201648, 0.052638039, 0.0478502885, -0.1108255163, 0.0653963014, -0.0047265422, 0.0575618036, 0.0068313838, 0.0510058515, -0.0053284112, -0.0276791751, 0.0179812629, 0.0390364788, 0.0221297387, 0.0713809878, -0.0183893088, 0.0071680225, 0.0742101148, 0.0272983313, -0.0523932092, 0.0017988064, 0.0449395552, -0.0585411154, -0.1490730941, -0.024646027, -0.0620775223, 0.0475510545, 0.0353368521, -0.0980400443, -0.0473606326, -0.0551679283, 0.0547598824, 0.0465445407, -0.1117504165, 0.0041892808, -0.118932046, 0.1378654093, 0.1013588309, 0.0545694605, -0.0645258054, -0.0322901048, 0.0471158065, 0.087104395, -0.024523614, -0.0195046384, 0.0294065736, 0.0646346137, -0.0340855084, 0.0313651972, -0.0047197416, 0.0493464619, 0.0008875018, 0.0273119323, 0.0764407665, -0.0194774345, -0.0032762759, 0.0034020904, -0.063056834, 0.0118401581, -0.000706006, -0.1074523255, 0.0066579636, -0.0546510704, 0.0586499274, 0.0992913917, 0.03530965, -0.0342215262, -0.0396077447, 0.0420016199, -0.0520939752, 0.0180220678, 0.0327525586, 0.008943026, 0.0216672849, 0.031501215, -0.0359081179, -0.0902599543, -0.0641993657, -0.0826430842, -0.0515227094, -0.0746453628, 0.0698576123, -0.031419605, 0.112838544, -0.017641224, -0.0405598544, 0.0025570933, 0.0698576123, -0.0395805389, -0.0869411752, 0.0584323034, 0.0750262067, 0.0362889618, 0.0443954915, 0.0278423931, -0.0856354237, -0.0520667732, -0.0225377847, -0.0631656498, -0.0260469876, -0.0489112101, 0.0699120238, -0.0476054624, -0.1166469827, 0.0001907406, -0.06953118, -0.0898791105, 0.0563648678, -0.0479591005, 0.1058201417, -0.0582690835, -0.0415119641, 0.1104446724, -0.010758834, 0.1034806743, -0.0831327364, -0.0430897437, 0.0076100728, 0.0405870564, -0.0653963014, -0.0351464301, 0.0460820869, -0.0045361202, -0.0316644311, -0.0904775783, -0.0657227412, 0.0039580539, -0.0031997671, 0.0056684501, 0.0967887044, 0.1050040424, 0.0050835833, 0.0577794276, 0.0661579892, 0.1034262627, -0.0900967345, -0.0201983172, -0.0783993974, -0.0076304753, -0.0178996529, 0.049509678, -0.1310102344, 0.0439330414, 0.0526924431, -0.0746453628, -0.2007590234, -0.0719794556, -0.0795419216, -0.0370234475, 0.0445587113, 0.0016500393, -0.0755158663, -0.03530965, 0.0172603801, -0.0489384159, 0.0569633357, -0.024373997, 0.1006515473, 0.0400974005, -0.0281824339, 0.0310115572, 0.0646346137, 0.0929258615, 0.045374807, -0.1071258858, 0.0231906604, -0.0147440918, 0.0609349906, -0.0002291013, 0.0580514595, 0.0466533527, 0.0638185218, -0.0495368838, -0.0757878944, 0.0039376519, 0.0395805389, -0.0295697916, -0.0417023823, -0.0278423931, 0.066702053, 0.0096027013, 0.0946124569, 0.0756790787, 0.0394445248, -0.0863971114, 0.0752982348, -0.0482039303, -0.0465445407, 0.0283456519, -0.0903687701, 0.0205383562, 0.0412399322, 0.0630024299, 0.0615334585, -0.0003043349, 0.0070932135, -0.0288081057, 0.0651786774, -0.0951565132, -0.0291073397, -0.0201167073, -0.0965710804, -0.1651773453, -0.0424096659, -0.0359625258, -0.1312278509, -0.0561472401, 0.0113505023, -0.1105534807, -0.1544049084, 0.0163218733, 0.0452115871, 0.0653963014, -0.0708913356, 0.014050412, -0.0093986783, -0.0036316167, 0.0694223642, 0.0072700339, 0.0007276835, 0.0408590883, -0.0167571232, -0.0725779235, -0.0570721477, -0.146896854 ]
712.255
Jun Zhang
James J. Zhang, Jun Zhang
Double Extension Regular Algebras of Type (14641)
null
null
null
null
math.RA
null
We construct several families of Artin-Schelter regular algebras of global dimension four using double Ore extension and then prove that all these algebras are strongly noetherian, Auslander regular, Koszul and Cohen-Macaulay domains. Many regular algebras constructed in the paper are new and are not isomorphic to either a normal extension or an Ore extension of an Artin-Schelter regular algebra of global dimension three.
[ { "version": "v1", "created": "Sun, 16 Dec 2007 00:37:08 GMT" } ]
2007-12-18T00:00:00
[ [ "Zhang", "James J.", "" ], [ "Zhang", "Jun", "" ] ]
[ -0.013159534, 0.0036726398, 0.0439623185, 0.0821407661, -0.036161378, 0.0578873679, -0.0370848551, -0.0413863063, -0.1329805553, -0.0347032584, 0.0023542563, -0.0907436684, 0.0169992503, 0.0508883893, 0.0491629466, 0.0912297145, 0.0050092498, -0.0329292119, 0.0444726609, 0.1148026511, -0.0669277087, -0.067510955, 0.0315439962, -0.1507696211, 0.0112275248, -0.0438651107, 0.0543878786, -0.0218718015, 0.0971594006, -0.0199033394, 0.0820921585, -0.0720311329, 0.0450073071, 0.0234392807, -0.1299671084, 0.0544364825, -0.0230504479, 0.0423340872, 0.0297942534, 0.040414229, 0.033220835, 0.0026063896, 0.0158084519, -0.0201099049, 0.1129556969, 0.0660042316, -0.0138521409, 0.062504746, -0.0353837125, 0.0340714045, -0.0445455685, 0.056283433, 0.0692607015, -0.0609980226, -0.1370632797, -0.0041040005, 0.0067620319, 0.0324917771, 0.0415564217, -0.0684344321, -0.0151036941, -0.0625533536, 0.0964789465, 0.0003554168, -0.0955068618, -0.0018803673, -0.1836259216, 0.0330507196, 0.1274396926, 0.0597343184, -0.1101366654, -0.0422125757, 0.1235513762, 0.0919587687, -0.0006045123, 0.0091557791, -0.0222484823, 0.0530755706, -0.0328077003, 0.0661500469, -0.0328320041, 0.1272452772, -0.021397911, 0.0445698686, 0.1283145696, 0.0011072599, -0.0054254215, 0.0075943754, -0.0387616903, -0.0010578965, 0.029940065, -0.0602689609, -0.0020398493, -0.0758708492, 0.0862721056, 0.0455419496, 0.0402927175, -0.0127585502, -0.0245693233, 0.0537560247, -0.0271453355, 0.01117892, 0.1079008877, 0.0073209777, 0.0313981846, 0.0479721501, -0.0033567138, -0.0713506714, -0.0709132403, -0.0498677045, -0.0876816213, -0.0660042316, 0.0204501338, -0.0560890175, 0.0847167745, -0.0234392807, -0.1254955381, -0.0241197366, 0.0369876437, -0.0166954752, -0.051617451, 0.0871469751, 0.0900146142, 0.046708446, 0.0222241804, 0.0293325149, -0.1067343876, -0.0729060024, -0.0485067926, -0.0435248837, 0.0444726609, -0.0443511531, 0.045080211, -0.0357239433, -0.1336610019, 0.0205594935, 0.0444969647, -0.0614354573, -0.0156504884, -0.0071447883, 0.1162607744, 0.0229532402, 0.0097147245, 0.1083869264, 0.0160514712, 0.118690975, -0.0942431614, -0.0418966487, 0.0074121105, 0.0824809894, -0.0658584237, -0.0695523247, 0.1036237329, -0.0158084519, -0.0400983021, -0.1539774835, -0.0378625169, -0.0106442766, 0.0220054612, 0.0173273273, 0.0713506714, 0.0307420306, -0.0586650297, 0.1049846411, 0.0524437167, 0.0645461157, -0.0341200083, -0.0407058522, -0.0678997934, -0.100610286, 0.0333666466, 0.0221391227, -0.1440622658, 0.0159178115, 0.0235850923, -0.0163066424, -0.114122197, -0.0638656616, -0.0987633318, -0.0245814733, 0.0461981036, 0.0544364825, -0.0570124947, 0.0112153739, -0.0581303872, 0.0144475391, 0.0977426469, -0.028263228, 0.1120808274, 0.0412161946, -0.043767903, -0.0250310618, 0.0496003851, 0.1406599879, 0.0582275949, -0.150672406, 0.028263228, 0.0532213822, 0.0443268493, -0.0360155664, 0.0558946021, -0.0456391573, 0.0577415526, -0.049333062, -0.06969814, -0.0340471044, 0.0298914611, 0.0064400304, -0.0400739983, -0.0763082802, 0.0283847377, -0.0198182818, 0.0767943263, 0.0077584139, -0.0067195031, -0.0387373902, 0.0449100994, -0.0263433699, -0.0557487905, 0.016440304, -0.0787870884, -0.0191621277, -0.0090038916, -0.0082748309, 0.0541934632, -0.0052067037, 0.0171450619, 0.0084631722, 0.0310579576, -0.0655668005, -0.0037394704, 0.0228560325, -0.1044013947, -0.1070260108, -0.0713020712, -0.0557487905, -0.0488956273, -0.0958956927, -0.0157476962, -0.1044986024, -0.0861262903, 0.0136577245, 0.0687746629, 0.082967028, 0.0196360163, 0.0334638543, -0.002383115, -0.0330993235, 0.0713020712, -0.0280931126, -0.0359426588, 0.0551169366, -0.0139979525, -0.0475347154, -0.0522006974, -0.0244599637 ]
712.2551
Jun Zhang
Jun Zhang
Artin-Schelter Regular Algebras, Subalgebras, and Pushouts
null
null
null
null
math.RA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Take $A$ to be a regular quadratic algebra of global dimension three. We observe that there are examples of $A$ containing a dimension three regular cubic algebra $C$. If $B$ is another dimension three regular quadratic algebra, also containing $C$ as a subalgebra, then we can form the pushout algebra $D$ of the inclusions $i_1:C\hookrightarrow A$ and $i_2:C\hookrightarrow B$. We show that for a certain class of regular algebras $C\hookrightarrow A,B$, their pushouts $D$ are regular quadratic algebras of global dimension four. Furthermore, some of the point module structures of the dimension three algebras get passed on to the pushout algebra $D$.
[ { "version": "v1", "created": "Sun, 16 Dec 2007 00:42:05 GMT" }, { "version": "v2", "created": "Thu, 2 Sep 2010 18:22:49 GMT" } ]
2010-09-03T00:00:00
[ [ "Zhang", "Jun", "" ] ]
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712.2552
Yeow Meng Chee
Yeow Meng Chee, Alan C. H. Ling, San Ling, and Hao Shen
The PBD-Closure of Constant-Composition Codes
8 pages
IEEE Transactions on Information Theory, vol. 53, No. 8, August 2007, pp. 2685-2692
10.1109/TIT.2007.901175
null
cs.IT cs.DM math.CO math.IT
null
We show an interesting PBD-closure result for the set of lengths of constant-composition codes whose distance and size meet certain conditions. A consequence of this PBD-closure result is that the size of optimal constant-composition codes can be determined for infinite families of parameter sets from just a single example of an optimal code. As an application, the size of several infinite families of optimal constant-composition codes are derived. In particular, the problem of determining the size of optimal constant-composition codes having distance four and weight three is solved for all lengths sufficiently large. This problem was previously unresolved for odd lengths, except for lengths seven and eleven.
[ { "version": "v1", "created": "Sun, 16 Dec 2007 01:02:12 GMT" } ]
2007-12-18T00:00:00
[ [ "Chee", "Yeow Meng", "" ], [ "Ling", "Alan C. H.", "" ], [ "Ling", "San", "" ], [ "Shen", "Hao", "" ] ]
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712.2553
Yeow Meng Chee
Yeow Meng Chee and Charles J. Colbourn
Constructions for Difference Triangle Sets
4 pages
IEEE Transactions on Information Theory, vol. 43, No. 4, July 1997, pp. 1346-1349
null
null
cs.IT cs.DM math.CO math.IT
null
Difference triangle sets are useful in many practical problems of information transmission. This correspondence studies combinatorial and computational constructions for difference triangle sets having small scopes. Our algorithms have been used to produce difference triangle sets whose scopes are the best currently known.
[ { "version": "v1", "created": "Sun, 16 Dec 2007 01:17:35 GMT" } ]
2007-12-18T00:00:00
[ [ "Chee", "Yeow Meng", "" ], [ "Colbourn", "Charles J.", "" ] ]
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712.2554
K. R. Goodearl
K. R. Goodearl
Leavitt path algebras and direct limits
23 pages; amstex; 3 xypic figures
null
null
null
math.RA
null
An introduction to Leavitt path algebras of arbitrary directed graphs is presented, and direct limit techniques are developed, with which many results that had previously been proved for countable graphs can be extended to uncountable ones. Such results include characterizations of simplicity, characterizations of the exchange property, and cancellation conditions for the K-theoretic monoid of equivalence classes of idempotent matrices.
[ { "version": "v1", "created": "Sun, 16 Dec 2007 01:17:57 GMT" } ]
2007-12-18T00:00:00
[ [ "Goodearl", "K. R.", "" ] ]
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712.2555
Ujjal Debnath
Subenoy Chakraborty and Ujjal Debnath
Shell Crossing Singularities in Quasi-Spherical Szekeres Models
10 latex pages, RevTex style, no figures
Grav.Cosmol.14:184-189,2008
10.1134/S0202289308020102
null
gr-qc
null
We investigate the occurrence of shell crossing singularities in quasi-spherical Szekeres dust models with or without a cosmological constant. We study the conditions for shell crossing singularity both from physical and geometrical point of view and they are in agreement.
[ { "version": "v1", "created": "Sun, 16 Dec 2007 02:45:15 GMT" } ]
2009-11-13T00:00:00
[ [ "Chakraborty", "Subenoy", "" ], [ "Debnath", "Ujjal", "" ] ]
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712.2556
Christian Buth
Robin Santra, Christian Buth, Emily R. Peterson, Robert W. Dunford, Elliot P. Kanter, Bertold Kr\"assig, Stephen H. Southworth, Linda Young
Strong-field control of x-ray absorption
8 pages, 5 figures, 1 table, LaTeX
J. Phys.: Conf. Ser. 88, 012052 (2007) (8 pages)
10.1088/1742-6596/88/1/012052
null
physics.atom-ph physics.chem-ph physics.optics
null
Strong optical laser fields modify the way x rays interact with matter. This allows us to use x rays to gain deeper insight into strong-field processes. Alternatively, optical lasers may be utilized to control the propagation of x rays through a medium. Gas-phase systems are particularly suitable for illustrating the basic principles underlying combined x-ray and laser interactions. Topics addressed include the impact of spin-orbit interaction on the alignment of atomic ions produced in a strong laser field, electromagnetically induced transparency in the x-ray regime, and laser-induced alignment of molecules.
[ { "version": "v1", "created": "Sun, 16 Dec 2007 05:23:22 GMT" } ]
2013-03-25T00:00:00
[ [ "Santra", "Robin", "" ], [ "Buth", "Christian", "" ], [ "Peterson", "Emily R.", "" ], [ "Dunford", "Robert W.", "" ], [ "Kanter", "Elliot P.", "" ], [ "Krässig", "Bertold", "" ], [ "Southworth", "Stephen H.", "" ], [ "Young", "Linda", "" ] ]
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712.2557
Wenfeng Chen WFC
W.F. Chen
A Note on the Radiatively Induced Lorentz and CPT Violated Chern-Simons-like Term in the Extended Quantum Electrodynamics
9 pages, RevTex 4, no figure, some misprints are corrected
null
null
null
hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We show that the ambiguity for the Chern-Simons-like term induced from quantum correction in the extended QED should have nothing to do with the approximation on the exact fermionic propagator, contradictory to the claim in Ref.[19]. Further, we investigate the induced Chern-Simons-like term using the original 't Hooft-Veltman dimensional regularization and reproduce the result obtained by gauge symmetry analysis. This fact demonstrates that the origin of the ambiguity should lie in different choices on regularization schemes.
[ { "version": "v1", "created": "Sun, 16 Dec 2007 06:13:00 GMT" }, { "version": "v2", "created": "Thu, 9 Jul 2009 23:42:34 GMT" } ]
2009-07-10T00:00:00
[ [ "Chen", "W. F.", "" ] ]
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712.2558
Rochus Klesse
Rochus Klesse
A random-coding based proof for the quantum coding theorem
25 pages, to appear in Open Systems and Information Dynamics
null
null
null
quant-ph
null
We present a proof for the quantum channel coding theorem which relies on the fact that a randomly chosen code space typically is highly suitable for quantum error correction. In this sense, the proof is close to Shannon's original treatment of information transmission via a noisy classical channel.
[ { "version": "v1", "created": "Sun, 16 Dec 2007 07:35:44 GMT" } ]
2007-12-18T00:00:00
[ [ "Klesse", "Rochus", "" ] ]
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712.2559
Glenn Merlet
Glenn Merlet (LIAFA)
Cycle time of stochastic max-plus linear systems
This article has been published by IMS in Electronic Journal of Probability at http://www.math.washington.edu/~ejpecp/viewarticle.php?id=1781
Electronic Journal of Probability 13 (2008) (2008) Paper 12, 322-340
null
null
math.PR cs.DM
null
We analyze the asymptotic behavior of sequences of random variables defined by an initial condition, a stationary and ergodic sequence of random matrices, and an induction formula involving multiplication is the so-called max-plus algebra. This type of recursive sequences are frequently used in applied probability as they model many systems as some queueing networks, train and computer networks, and production systems. We give a necessary condition for the recursive sequences to satisfy a strong law of large numbers, which proves to be sufficient when the matrices are i.i.d. Moreover, we construct a new example, in which the sequence of matrices is strongly mixing, that condition is satisfied, but the recursive sequence do not converges almost surely.
[ { "version": "v1", "created": "Sun, 16 Dec 2007 07:54:35 GMT" }, { "version": "v2", "created": "Tue, 11 Mar 2008 20:04:21 GMT" } ]
2008-03-12T00:00:00
[ [ "Merlet", "Glenn", "", "LIAFA" ] ]
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712.256
Yigal Shamir
Claude Bernard, Maarten Golterman, Yigal Shamir
Effective field theories for QCD with rooted staggered fermions
Minor changes, few references added; RevTeX, 35 pages
Phys.Rev.D77:074505,2008
10.1103/PhysRevD.77.074505
null
hep-lat
null
Even highly improved variants of lattice QCD with staggered fermions show significant violations of taste symmetry at currently accessible lattice spacings. In addition, the "rooting trick" is used in order to simulate with the correct number of light sea quarks, and this makes the lattice theory nonlocal, even though there is good reason to believe that the continuum limit is in the correct universality class. In order to understand scaling violations, it is thus necessary to extend the construction of the Symanzik effective theory to include rooted staggered fermions. We show how this can be done, starting from a generalization of the renormalization-group approach to rooted staggered fermions recently developed by one of us. We then explain how the chiral effective theory follows from the Symanzik action, and show that it leads to "rooted" staggered chiral perturbation theory as the correct chiral theory for QCD with rooted staggered fermions. We thus establish a direct link between the renormalization-group based arguments for the correctness of the continuum limit and the success of rooted staggered chiral perturbation theory in fitting numerical results obtained with the rooting trick. In order to develop our argument, we need to assume the existence of a standard partially-quenched chiral effective theory for any local partially-quenched theory. Other technical, but standard, assumptions are also required.
[ { "version": "v1", "created": "Sun, 16 Dec 2007 08:09:03 GMT" }, { "version": "v2", "created": "Fri, 7 Mar 2008 01:31:00 GMT" } ]
2008-11-26T00:00:00
[ [ "Bernard", "Claude", "" ], [ "Golterman", "Maarten", "" ], [ "Shamir", "Yigal", "" ] ]
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712.2561
Andre\u{i} Sobolevski\u{i}
Roya Mohayaee and Andrei Sobolevskii
The Monge-Amp\`ere-Kantorovich approach to reconstruction in cosmology
6 pages, 2 figures; based on an invited lecture at the conference "Euler's Equations: 250 Years On" (see http://www.obs-nice.fr/etc7/EE250/); to be published in a special issue of Physica D containing the proceedings of that conference
PhysicaD237:2145-2150,2008
10.1016/j.physd.2008.01.007
null
astro-ph
null
Motion of a continuous fluid can be decomposed into an "incompressible" rearrangement, which preserves the volume of each infinitesimal fluid element, and a gradient map that transfers fluid elements in a way unaffected by any pressure or elasticity (the polar decomposition of Y. Brenier). The Euler equation describes a system whose kinematics is dominated by the incompressible rearrangement. The opposite limit, in which the incompressible component is negligible, corresponds to the Zel'dovich approximation, a model of motion of self-gravitating fluid in cosmology. We present a method of approximate reconstruction of the large-scale proper motions of matter in the Universe from the present-day mass density field. The method is based on recovering the corresponding gradient transfer map. We discuss its algorithmics, tests of the method against mock cosmological catalogues, and its application to observational data, which result in tight constraints on the mean mass density Omega_m and age of the Universe.
[ { "version": "v1", "created": "Sun, 16 Dec 2007 13:22:35 GMT" } ]
2008-11-26T00:00:00
[ [ "Mohayaee", "Roya", "" ], [ "Sobolevskii", "Andrei", "" ] ]
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712.2562
Tian De Cao
Tian De Cao
A new model and its physics
5pages
null
null
null
physics.gen-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The high temperature superconductivity in cuprate materials1 has puzzled scientists over twenty years. We must find a new way to understand superconductivity. It is found the spin-charge correlation may dominate the superconductivity2, and we base our judgment upon the features of various superconductors. Thus we presented the idea that superconductivity could be described by correlations. To develop this idea into a quantitative theory, the first work is to give a model and show that various superconductivities can be included in this model. Moreover, superconductivity can originate from the spin-singlet pairing3 or from the spin-triplet pairing4. The spin-singlet pairing favors to appear at the border of antiferromagnetism5, while the spin-triplet pairing favors to appear at the border of ferromagnetism6. The coexistence between superconductivity and magnetism is also possible7,8. Therefore, the second work is to reveal the relation between superconductivity and magnetism.
[ { "version": "v1", "created": "Sun, 16 Dec 2007 09:50:40 GMT" }, { "version": "v2", "created": "Sat, 26 Jul 2008 06:33:08 GMT" }, { "version": "v3", "created": "Sat, 11 Apr 2009 10:25:37 GMT" } ]
2009-04-11T00:00:00
[ [ "De Cao", "Tian", "" ] ]
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712.2563
Rui Guo
Rui Guo and Hong Guo
Atom--photon momentum entanglement with quantum interference
4 pages, 4 figures
null
null
null
quant-ph
null
With quantum interference of two-path spontaneous emissions, we propose a novel scheme to coherently control the atom--photon momentum entanglement through atomic internal coherence. A novel phenomenon called ``momentum phase entanglement'' is reported, and we found, under certain conditions, that more controllable entangled state can be produced with super--high degree of entanglement.
[ { "version": "v1", "created": "Sun, 16 Dec 2007 10:17:47 GMT" } ]
2007-12-18T00:00:00
[ [ "Guo", "Rui", "" ], [ "Guo", "Hong", "" ] ]
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712.2564
Mark Perel'man
Mark E. Perel'man, Galina M. Rubinstein and Vitali A. Tatartchenko
Mechanisms of Dendrites Occurrence during Crystallization: Features of the Ice Crystals Formation
6 pages
null
10.1016/j.physleta.2008.03.009
null
physics.ao-ph physics.gen-ph
null
Dendrites formation in the course of crystallization presents very general phenomenon, which is analyzed in details via the example of ice crystals growth in deionized water. Neutral molecules of water on the surface are combined into the double electric layer (DEL) of oriented dipoles; its field reorients approaching dipoles with observable radio-emission in the range of 150 kHz. The predominant attraction of oriented dipoles to points of gradients of this field induces dendrites growth from them, e.g. formation of characteristic form of snowflakes at free movement of clusters through saturated vapor in atmosphere. The constant electric field strengthens DELs' field and the growth of dendrites. Described phenomena should appear at crystallization of various substances with dipole molecules, features of radio-emission can allow the monitoring of certain processes in atmosphere and in technological processes. Crystallization of particles without constant moments can be stimulated by DELs of another nature with attraction of virtual moments of particles to gradients of fields and corresponding dendrites formation.
[ { "version": "v1", "created": "Sun, 16 Dec 2007 10:29:06 GMT" }, { "version": "v2", "created": "Fri, 29 Feb 2008 18:27:29 GMT" } ]
2009-11-13T00:00:00
[ [ "Perel'man", "Mark E.", "" ], [ "Rubinstein", "Galina M.", "" ], [ "Tatartchenko", "Vitali A.", "" ] ]
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712.2565
Hans De Raedt
Hans De Raedt, Koen De Raedt, Kristel Michielsen, Koenraad Keimpema, and Seiji Miyashita
Event-based computer simulation model of Aspect-type experiments strictly satisfying Einstein's locality conditions
null
J. Phys. Soc. Jpn. 76, 104005 (2007)
10.1143/JPSJ.76.104005
null
quant-ph
null
Inspired by Einstein-Podolsky-Rosen-Bohm experiments with photons, we construct an event-based simulation model in which every essential element in the ideal experiment has a counterpart. The model satisfies Einstein's criteria of local causality and does not rely on concepts of quantum and probability theory. We consider experiments in which the averages correspond to those of a singlet and product state of a system of two $S=1/2$ particles. The data is analyzed according to the experimental procedure, employing a time window to identify pairs. We study how the time window and the passage time of the photons, which depends on the relative angle between their polarization and the polarizer's direction, influences the correlations, demonstrating that the properties of the optical elements in the observation stations affect the correlations although the stations are separated spatially and temporarily. We show that the model can reproduce results which are considered to be intrinsically quantum mechanical.
[ { "version": "v1", "created": "Sun, 16 Dec 2007 11:06:47 GMT" } ]
2007-12-18T00:00:00
[ [ "De Raedt", "Hans", "" ], [ "De Raedt", "Koen", "" ], [ "Michielsen", "Kristel", "" ], [ "Keimpema", "Koenraad", "" ], [ "Miyashita", "Seiji", "" ] ]
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712.2566
Frederic Brechenmacher FB
Frederic Brechenmacher
Algebraic generality vs arithmetic generality in the controversy between C. Jordan and L. Kronecker (1874)
To be inserted in a collective volume
null
null
null
math.HO
null
Throughout the whole year of 1874, C. Jordan and L. Kronecker were quarrelling over two theorems. On the one hand, Jordan had stated in 1870 a canonical form theorem for substitutions of linear groups; on the other hand, Karl Weierstrass had introduced in 1868 the elementary divisors of non singular pairs of bilinear forms (P,Q) in stating a key theorem of the theory of bilinear and quadratic forms. Although they would be considered equivalent as regard to modern mathematics, not only had these two theorems been stated independently and for different purposes, they had also been lying within the distinct frameworks of two theories until some connections came to light in 1872-1873, breeding the 1874 quarrel and hence revealing an opposition over two practices relating to distinctive cultural features. As we will be looking into the 1874 quarrel, our purpose will be to show how the complex identities of practices such as Jordan s canonical reduction and Kronecker s invariant computation highlight some cultural issues such as tacit knowledge and perceptions of history peculiar to individuals or communities as well as some local ways of thinking such as disciplinary ideals and internal philosophies of generality and simplicity.
[ { "version": "v1", "created": "Sun, 16 Dec 2007 11:11:44 GMT" } ]
2007-12-18T00:00:00
[ [ "Brechenmacher", "Frederic", "" ] ]
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712.2567
Petros Petrosyan
Rafael R. Kamalian and Petros A. Petrosyan
On Lower Bound for W(K_{2n})
3 pages
Mathematical Problems of Computer Science 23, 2004, 127--129
null
null
cs.DM
null
The lower bound W(K_{2n})>=3n-2 is proved for the greatest possible number of colors in an interval edge coloring of the complete graph K_{2n}.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 10:45:39 GMT" } ]
2007-12-18T00:00:00
[ [ "Kamalian", "Rafael R.", "" ], [ "Petrosyan", "Petros A.", "" ] ]
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712.2568
Ian G. Moss
Ian G. Moss
Superfluidity in Super-Yang-Mills Theory
6 pages, 5 figures
null
null
null
hep-th
null
The AdS/CFT correspondence suggests that there is a point in the phase diagram of strongly interacting gauge-theory matter where the viscosity approaches zero. This paper analyses the possibility that this point represents a superfluid and that the the system near this point in the phase diagram can be described by a Landau fluid. Superfluid vortices are constructed and the AdS analogue of vorticity quantisation is described. The production of vortices in the quark-gluon plasma during heavy ion collisions is discussed.
[ { "version": "v1", "created": "Sun, 16 Dec 2007 11:48:13 GMT" } ]
2007-12-18T00:00:00
[ [ "Moss", "Ian G.", "" ] ]
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712.2569
Norio Narita
Norio Narita, Bun'ei Sato, Osamu Ohshima, Joshua N. Winn
A Possible Spin-Orbit Misalignment in the Transiting Eccentric Planet HD 17156b
5 pages, 2 figures, 3 tables. Accepted for publication in PASJ Letters (Vol. 60, No. 2)
PASJ Letters, 2008, Vol.60, No.2, pp.L1-L5
10.1093/pasj/60.2.L1
null
astro-ph
null
We present simultaneous photometric and spectroscopic observations of HD 17156b spanning a transit on UT 2007 November 12. This system is of special interest because of its 21-day period (unusually long for a transiting planet) and its high orbital eccentricity of 0.67. By modeling the Rossiter-McLaughlin effect, we find the angle between the sky projections of the orbital axis and the stellar rotation axis to be $62^{\circ} \pm 25^{\circ}$. Such a large spin-orbit misalignment, as well as the large eccentricity, could be explained as the relic of a previous gravitational interaction with other planets.
[ { "version": "v1", "created": "Sun, 16 Dec 2007 12:28:23 GMT" }, { "version": "v2", "created": "Fri, 1 Feb 2008 06:02:35 GMT" } ]
2015-05-13T00:00:00
[ [ "Narita", "Norio", "" ], [ "Sato", "Bun'ei", "" ], [ "Ohshima", "Osamu", "" ], [ "Winn", "Joshua N.", "" ] ]
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712.257
Jun-Qing Xia
Jun-Qing Xia, Xinmin Zhang
Constraining Slow-Roll Inflation in the Presence of Dynamical Dark Energy
5 pages, 2 figures, 1 table, Accepted for publication in Phys.Lett.B
Phys.Lett.B660:287-292,2008
10.1016/j.physletb.2008.01.010
null
astro-ph
null
In this paper we perform a global analysis of the constraints on the inflationary parameters in the presence of dynamical dark energy models from the current observations, including the three-year Wilkinson Microwave Anisotropy Probe (WMAP3) data, Boomerang-2K2, CBI, VSA, ACBAR, SDSS LRG, 2dFGRS and ESSENCE (192 sample). We use the analytic description of the inflationary power spectra in terms of the Horizon-flow parameters $\{\epsilon_i\}$. With the first order approximation in the slow-roll expansion, we find that the constraints on the Horizon-flow parameters are $\epsilon_1<0.014 (95% C.L.)$ and $\epsilon_2=0.034\pm0.024 (1\sigma)$ in the $\Lambda$CDM model. In the framework of dynamical dark energy models, the constraints become obviously weak, $\epsilon_1<0.022 (95% C.L.)$ and $\epsilon_2=-0.006\pm0.039 (1\sigma)$, and the inflation models with a "blue" tilt, which are excluded about $2\sigma$ in the $\Lambda$CDM model, are allowed now. With the second order approximation, the constraints on the Horizon-flow parameters are significantly relaxed further. If considering the non-zero $\epsilon_3$, the large running of the scalar spectral index is found for the $\Lambda$CDM model, as well as the dynamical dark energy models.
[ { "version": "v1", "created": "Sun, 16 Dec 2007 13:08:12 GMT" }, { "version": "v2", "created": "Wed, 16 Jan 2008 06:49:05 GMT" } ]
2008-11-26T00:00:00
[ [ "Xia", "Jun-Qing", "" ], [ "Zhang", "Xinmin", "" ] ]
[ 0.1025391594, 0.0766984671, 0.0094521856, -0.0659915656, -0.0881775022, 0.0574466363, -0.0446292423, 0.0491076075, -0.0851919204, 0.0137696909, -0.0352864414, -0.0193419121, -0.1089221165, 0.017771909, 0.0725289509, 0.0811253563, -0.0525049902, 0.0630059913, -0.0077792322, 0.1092309728, -0.074227646, -0.1064512953, 0.0013045818, 0.1309536248, -0.0446292423, -0.0183510091, 0.0187370759, 0.0095422678, 0.082103394, -0.0718082935, 0.0697492808, -0.0435225181, -0.0816915855, -0.1212762371, -0.0913175046, 0.1403221637, -0.0674843565, 0.0213365871, 0.0415407121, -0.0764410868, -0.0159573983, -0.058836475, -0.1003257111, 0.0599689372, 0.0608440191, 0.0253388062, -0.0301646329, -0.0411803834, 0.0213880632, 0.0017405148, -0.0504974462, 0.0451439954, 0.0472544916, -0.0885378271, -0.0621309057, -0.0094779227, -0.0178105161, 0.0471772775, 0.0046392279, -0.0696978047, -0.0031866541, -0.1841792762, -0.1026421115, 0.0439085849, -0.0274364315, -0.0014252274, -0.0245666727, 0.0526336804, -0.0294697136, 0.0867361873, -0.0675358325, -0.0584761463, 0.0495194122, 0.0129267806, 0.0777794495, -0.0349261127, 0.0280283988, 0.0366505422, -0.1291005015, 0.0849345475, -0.0431364551, 0.0240647867, -0.0720141977, 0.0006969298, -0.0134222321, 0.0257763471, 0.0160860885, 0.0198051911, -0.0309882406, 0.0292638112, 0.005292323, -0.0328413583, -0.0213494562, -0.0421069451, 0.0403825156, -0.0101406695, 0.0395331681, 0.0296498779, 0.0693374723, -0.0079980027, 0.0114211226, 0.0348746404, 0.1463962644, -0.0857066736, 0.0730951801, 0.0755145326, -0.0087122256, -0.0018450742, -0.0259050354, -0.0550787635, 0.0121224755, 0.0042724651, -0.0688741952, -0.011627024, -0.0359813608, -0.054872863, -0.2039458603, 0.0277967602, -0.0679991096, -0.0051507652, -0.0057652537, -0.0063636564, 0.0436512083, 0.0368564464, -0.0536889285, -0.0926043913, -0.0495451503, -0.0823607668, -0.0796840414, 0.0577040128, 0.070624359, -0.0305249598, -0.0168839581, -0.0539977811, -0.1149962246, 0.0099347681, 0.0926043913, 0.0367792323, 0.039095629, 0.0454013757, 0.0520417131, 0.070624359, 0.0235500336, 0.0523248278, 0.103465721, 0.0468169488, -0.0047486131, -0.0653738603, 0.0952296406, 0.0783456862, 0.0275136456, -0.012103173, 0.0159573983, -0.0517328605, 0.0055207452, -0.1193201691, 0.0207060128, 0.0301903691, 0.0206674058, -0.0668666512, -0.051938761, 0.1216880381, -0.0246310178, 0.0181965828, -0.0399707109, -0.0079722656, 0.0334590636, -0.0584246702, -0.1575149745, -0.1342480481, 0.0072001331, 0.0083712004, -0.0644473061, -0.1123194993, 0.062800087, 0.1062453911, -0.0176689588, -0.070675835, -0.0247983132, 0.0306021739, 0.0145546924, 0.0441659614, 0.0623882823, -0.0403825156, -0.0702125579, 0.0393530056, -0.0429048128, 0.0289034825, 0.0721686259, -0.0709846914, -0.0338708684, 0.0993991569, 0.1191142648, 0.0159445312, -0.0223789662, -0.0760807618, -0.0021185377, 0.052916795, 0.0742791221, 0.06439583, 0.0517328605, 0.0606381185, 0.1211732849, -0.1238500103, -0.0454785861, -0.0309625026, 0.0466625243, 0.0630059913, -0.0481038392, 0.0250556897, 0.0394044816, 0.0103079649, 0.0788604394, 0.0622853339, -0.0261752829, 0.0795296207, -0.0278224982, 0.017784778, 0.1363070756, 0.0573436879, -0.061822053, 0.057858441, -0.0043046372, 0.0518358089, 0.0484384261, -0.0129846903, 0.0072258706, 0.0125342794, -0.020255601, 0.0721686259, 0.0818974897, -0.0348231643, -0.0806106031, 0.0677932054, 0.0848830715, -0.0644473061, 0.0376543142, 0.0328670964, -0.0298300423, -0.1314683855, -0.0209376514, 0.0241548698, -0.0979578421, -0.0229323264, -0.0449380949, 0.0532771237, -0.0190845355, -0.1018185019, 0.0329185687, -0.0377572663, 0.0572407357, 0.0465080962, -0.0505489223, -0.0538433529, -0.037113823, 0.0067175501 ]
712.2571
Nathan Goldman
N. Goldman, A. Kubasiak, P. Gaspard and M. Lewenstein
Ultracold atomic gas in non-Abelian "magnetic" fields: the quantum Hall effect supremacy
6 pages, 5 figures
Phys. Rev. A. 79, 023624 (2009)
10.1103/PhysRevA.79.023624
null
cond-mat.mes-hall
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Nowadays it is experimentally feasible to create artificial, and in particular, non-Abelian gauge potentials for ultracold atoms trapped in optical lattices. Motivated by this fact, we investigate the fundamental properties of an ultracold Fermi gas in a non-Abelian U(2) gauge potential characterized by a \emph{constant} Wilson loop. Under this specific condition, the energy spectrum exhibits a robust band structure with large gaps and reveals a new fractal figure. The transverse conductivity is related to topological invariants and is shown to be quantized when the Fermi energy lies inside a gap of the spectrum. We demonstrate that the analogue of the integer quantum Hall effect for neutral atoms survives the non-Abelian coupling and leads to a striking fractal phase diagram. Moreover, this coupling induces an anomalous Hall effect as observed in graphene.
[ { "version": "v1", "created": "Sun, 16 Dec 2007 13:56:41 GMT" }, { "version": "v2", "created": "Fri, 21 Dec 2007 13:38:32 GMT" }, { "version": "v3", "created": "Wed, 14 May 2008 11:35:18 GMT" }, { "version": "v4", "created": "Tue, 24 Jun 2008 10:24:37 GMT" }, { "version": "v5", "created": "Tue, 9 Sep 2008 13:34:31 GMT" } ]
2009-05-29T00:00:00
[ [ "Goldman", "N.", "" ], [ "Kubasiak", "A.", "" ], [ "Gaspard", "P.", "" ], [ "Lewenstein", "M.", "" ] ]
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712.2572
Alexander Shatskiy Dr.
Alexander Shatskiy
Influence of Rotation on the Amount of Phantom Matter around wormholes
6 pages, 3 tables
Astron.Rep.51:81,2007; Astron.Zh.84:99,2007
10.1134/S1063772907020011
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Static (spherically symmetrical) and stationary solutions for wormholes are considered. The visibility horizon, which characterizes the differences between black holes and passing wormholes, is determined in an invariant way. It is shown that the rotation of wormholes does not affect the amount of phantom matter that surrounds them.
[ { "version": "v1", "created": "Sun, 16 Dec 2007 13:45:59 GMT" }, { "version": "v2", "created": "Sun, 22 Feb 2009 19:49:34 GMT" } ]
2009-11-13T00:00:00
[ [ "Shatskiy", "Alexander", "" ] ]
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712.2573
Denis Rastegaev Mr.
I.I. Balega (1), Yu.Yu. Balega (1), A.F. Maksimov (1), E.V. Malogolovets (1), D.A. Rastegaev (1), Z.U. Shkhagosheva (1), G. Weigelt (2) ((1) Special Astrophysical Observatory, Russia, (2) Max-Planck-Institut fur Radioastronomie, Germany)
Speckle Interferometry of Nearby Multiple Stars. IV. Measurements in 2004 and New Orbits
11 pages, 2 figures, accepted to Astrophysical Bulletin
Astrophys.Bull.62:339-351,2007
10.1134/S1990341307040050
null
astro-ph
null
The results of speckle interferometric observations of 104 binary and 6 triple stars performed at the BTA 6 m telescope in 2004 October are presented. Nearby low-mass stars are mostly observed for the program, among which 59 there are new binaries recently discovered by the Hipparcos astrometric satellite. Concurrently with the diffraction-limited position measurements we obtained 154 brightness ratio measurements of binary and multiple star components in different bands of the visible spectrum. New, first-resolved binaries are the symbiotic star CH Cyg with a weak companion at 0.043'' separation and the pair of red dwarfs, GJ 913 = HIP 118212. In addition, we derived the orbital parameters for two interferometric systems: the CN-giant pair HD 210211 = HIP 109281 (P=10.7 yr) and the G2V-K2V binary GJ 9830 = HIP 116259 (P=15.7 yr).
[ { "version": "v1", "created": "Mon, 17 Dec 2007 09:41:01 GMT" } ]
2009-03-19T00:00:00
[ [ "Balega", "I. I.", "" ], [ "Balega", "Yu. Yu.", "" ], [ "Maksimov", "A. F.", "" ], [ "Malogolovets", "E. V.", "" ], [ "Rastegaev", "D. A.", "" ], [ "Shkhagosheva", "Z. U.", "" ], [ "Weigelt", "G.", "" ] ]
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712.2574
Hans De Raedt
H. De Raedt
Event-by-event simulation of quantum phenomena
V Brazilian Meeting on Simulational Physics, Ouro Preto, 2007
null
null
null
quant-ph
null
In this talk, I discuss recent progress in the development of simulation algorithms that do not rely on any concept of quantum theory but are nevertheless capable of reproducing the averages computed from quantum theory through an event-by-event simulation. The simulation approach is illustrated by applications to single-photon Mach-Zehnder interferometer experiments and Einstein-Podolsky-Rosen-Bohm experiments with photons.
[ { "version": "v1", "created": "Sun, 16 Dec 2007 14:21:50 GMT" } ]
2007-12-18T00:00:00
[ [ "De Raedt", "H.", "" ] ]
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712.2575
Jonathan Tennenbaum
Danil Doubochinski and Jonathan Tennenbaum
On the Fundamental Properties of Coupled Oscillating Systems
12 pages, 9 figures. Paper presented to First Russian Workshop on the Nuclear Science of Condensed Matter, Dubna, May 19-20, 2007
null
null
null
physics.gen-ph
null
The present paper presents a new general conception of interaction between physical systems, differing significantly from that of both classical physics and quantum physics as generally understood. We believe this conception could provide the basis for a coherent understanding of several classes of natural phenomena that until now have been studied only in a piece-meal fashion. These include 1) the universal tendency for physical systems to associate together into stable dynamic formations; 2) the seemingly unlimited capacity for generation of physical objects in Nature, including the emergence of coherent, quantized states in physical systems of the most varied nature; 3) the existence of close couplings between processes whose characteristic length-scales, frequency- and energy-ranges differ by many orders of magnitude. The proposed conception first emerged in connection with experimental studies of the nonlinear behavior of coupled electromagnetic oscillators, and the discovery of two fundamental phenomena that had been overlooked in the classical theory of oscillations. The essential features of these phenomena are summarized in the first two sections of the paper, after which we indicate how the underlying physical principles can be combined under a single notion of interaction, providing a mechanism by which a practically unlimited wealth of physical objects could be generated by the interaction of just a few. The final section puts forward some preliminary ideas about the electromagneto-mechanical dual nature of physical objects as oscillatory processes, suggesting a universal scope for the proposed conceptions.
[ { "version": "v1", "created": "Sun, 16 Dec 2007 14:53:53 GMT" } ]
2007-12-18T00:00:00
[ [ "Doubochinski", "Danil", "" ], [ "Tennenbaum", "Jonathan", "" ] ]
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712.2576
R. H. Sanders
R.H. Sanders
Forming Galaxies with MOND
9 pages, 9 figures, revised in response to comments of referee. Table added, extended discussion, accepted MNRAS
null
10.1111/j.1365-2966.2008.13140.x
null
astro-ph
null
Beginning with a simple model for the growth of structure, I consider the dissipationless evolution of a MOND-dominated region in an expanding Universe by means of a spherically symmetric N-body code. I demonstrate that the final virialized objects resemble elliptical galaxies with well-defined relationships between the mass, radius, and velocity dispersion. These calculations suggest that, in the context of MOND, massive elliptical galaxies may be formed early (z > 10) as a result of monolithic dissipationless collapse. Then I reconsider the classic argument that a galaxy of stars results from cooling and fragmentation of a gas cloud on a time scale shorter than that of dynamical collapse. Qualitatively, the results are similar to that of the traditional picture; moreover, the existence, in MOND, of a density-temperature relation for virialized, near isothermal objects as well as a mass-temperature relation implies that there is a definite limit to the mass of a gas cloud where this condition can be met-- an upper limit corresponding to that of presently observed massive galaxies.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 10:37:00 GMT" }, { "version": "v2", "created": "Tue, 4 Mar 2008 15:59:39 GMT" } ]
2009-11-13T00:00:00
[ [ "Sanders", "R. H.", "" ] ]
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712.2577
Maurice Margenstern
Margenstern Maurice
Is the injectivity of the global function of a cellular automaton in the hyperbolic plane undecidable?
16 pages, 8 figures. A few words were missing in the initial version
null
null
null
cs.DM cs.LO
null
In this paper, we look at the following question. We consider cellular automata in the hyperbolic plane and we consider the global function defined on all possible configurations. Is the injectivity of this function undecidable? The problem was answered positively in the case of the Euclidean plane by Jarkko Kari, in 1994. In the present paper, we give a partial answer: when the configurations are restricted to a certain condition, the problem is undecidable.
[ { "version": "v1", "created": "Sun, 16 Dec 2007 15:12:45 GMT" }, { "version": "v2", "created": "Thu, 20 Dec 2007 08:33:17 GMT" } ]
2007-12-20T00:00:00
[ [ "Maurice", "Margenstern", "" ] ]
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712.2578
Paolo Dai Pra
Pietro Caputo, Paolo Dai Pra, Gustavo Posta
Convex Entropy Decay via the Bochner-Bakry-Emery approach
null
null
null
null
math.PR
null
We develop a method, based on a Bochner-type identity, to obtain estimates on the exponential rate of decay of the relative entropy from equilibrium of Markov processes in discrete settings. When this method applies the relative entropy decays in a convex way. The method is shown to be rather powerful when applied to a class of birth and death processes. We then consider other examples, including inhomogeneous zero-range processes and Bernoulli-Laplace models. For these two models, known results were limited to the homogeneous case, and obtained via the martingale approach, whose applicability to inhomogeneous models is still unclear.
[ { "version": "v1", "created": "Sun, 16 Dec 2007 15:40:05 GMT" } ]
2007-12-18T00:00:00
[ [ "Caputo", "Pietro", "" ], [ "Pra", "Paolo Dai", "" ], [ "Posta", "Gustavo", "" ] ]
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