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It is emphasized that the collective dynamics associated with color confinement is dominating over a point-like mechanism related to a scattering of the proton constituents at the currently available values of the momentum transferred in proton elastic scattering at the LHC. Deep--elastic scattering and its role in the dissimilation of the absorptive and reflective asymptotic scattering mechanisms are discussed with emphasis on the experimental signatures associated with the multiparticle...
Topics: High Energy Physics - Experiment, High Energy Physics - Phenomenology
Source: http://arxiv.org/abs/1301.0398
Arxiv.org
by Hai-Jhun Wanng
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In the light of their relationships with renormalization, in this paper we associate the scaling transformation with nonlocal interactions. On one hand, the association leads us to interpret the nonlocality with locally symmetric method. On the other hand, we find that the nonlocal interaction between hadrons could be test ground for scaling transformation if ascribing the running effects in renormalization to scaling transformation. First we derive directly from group theory the...
Topics: High Energy Physics - Phenomenology, High Energy Physics - Theory
Source: http://arxiv.org/abs/1301.0258
Arxiv.org
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In this paper, we study a class of second order backward stochastic differential equations (2BSDEs) with quadratic growth in coefficients. We first establish solvability for such 2BSDEs and then give their applications to robust utility maximization problems.
Topics: Mathematics, Probability
Source: http://arxiv.org/abs/1301.0457
Arxiv.org
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In this paper, we investigate the vanishing viscosity limit problem for the 3-dimensional (3D) incompressible Navier-Stokes equations in a general bounded smooth domain of $R^3$ with the generalized Navier-slip boundary conditions (\ref{VSg}). Some uniform estimates on rates of convergence in $C([0,T],L^2(\Omega))$ and $C([0,T],H^1(\Omega))$ of the solutions to the corresponding solutions of the idea Euler equations with the standard slip boundary condition are obtained.
Topics: Mathematics, Analysis of PDEs
Source: http://arxiv.org/abs/1301.0693
Arxiv.org
by The BESIII Collaboration; M. Ablikim; M. N. Achasov; O. Albayrak; D. J. Ambrose; F. F. An; Q. An; J. Z. Bai; Y. Ban; J. Becker; J. V. Bennett; M. Bertani; J. M. Bian; E. Boger; O. Bondarenko; I. Boyko; R. A. Briere; V. Bytev; X. Cai; O. Cakir; A. Calcaterra; G. F. Cao; S. A. Cetin; J. F. Chang; G. Chelkov; G. Chen; H. S. Chen; J. C. Chen; M. L. Chen; S. J. Chen; X. Chen; Y. B. Chen; H. P. Cheng; Y. P. Chu; D. Cronin-Hennessy; H. L. Dai; J. P. Dai; D. Dedovich; Z. Y. Deng; A. Denig; I....
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We search for the M1 radiative transition \psi(3686) \to \gamma\eta_{c}(2S) by reconstructing the exclusive \eta_{c}(2S) \to K_{S}^{0}K^{\pm}\pi^{\mp}\pi^{+}\pi^{-} decay using 1.06 \times 10^8 \psi(3686) events collected with the BESIII detector. The signal is observed with a statistical significance of greater than 4 standard deviations. The measured mass of the \eta_{c}(2S) is 3646.9 \pm 1.6(stat) \pm 3.6(syst) MeV/c^2, and the width is 9.9 \pm 4.8(stat) \pm 2.9(syst) MeV/c^2. The product...
Topic: High Energy Physics - Experiment
Source: http://arxiv.org/abs/1301.1476
Arxiv.org
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The aim of this paper is to obtain the fundamental tone for minimal submanifolds of the Euclidean or hyperbolic space under certain restrictions on the extrinsic curvature. We show some sufficient conditions on the norm of the second fundamental form that allow us to obtain the same upper and lower bound for the fundamental tone of minimal submanifolds in a Cartan-Hadamard ambient manifold. As an intrinsic result, we obtain a sufficient condition on the volume growth of a Cartan-Hadamard...
Topics: Mathematics, Differential Geometry
Source: http://arxiv.org/abs/1301.1148
Arxiv.org
by A. Aleksejevs; S. Barkanova
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Compton scattering offers a unique opportunity to study the dynamical structure of hadrons over a wide kinematic range, with polarizabilities characterizing the hadron active internal degrees of freedom. We present calculations and detailed analysis of electric and magnetic and the spin-dependent dynamical polarizabilities for the lowest in mass SU(3) octet of baryons. These extensive calculations are made possible by the recent implementation of semi-automatized calculations in chiral...
Topics: High Energy Physics - Phenomenology, Nuclear Theory
Source: http://arxiv.org/abs/1301.1383
Arxiv.org
by Rahim Moradi; Javad T. Firouzjaee; Reza Mansouri
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We have constructed a spherically symmetric structure model in a cosmological background filled with perfect fluid with non-vanishing pressure and studied its quasi-local characteristics. This is done by using the Lema\^{i}tre solution of the Einstein equations and suggesting an algorithm to integrate it numerically. The result shows intriguing effects of the pressure inside the structure. The evolution of the central black hole within the FRW universe, its decoupling from the expanding parts...
Topics: Astrophysics of Galaxies, General Relativity and Quantum Cosmology, Astrophysics
Source: http://arxiv.org/abs/1301.1480
Arxiv.org
by Changzheng Qu; Junfeng Song; Ruoxia Yao
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In this paper, multi-component generalizations to the Camassa-Holm equation, the modified Camassa-Holm equation with cubic nonlinearity are introduced. Geometric formulations to the dual version of the Schr\"odinger equation, the complex Camassa-Holm equation and the multi-component modified Camassa-Holm equation are provided. It is shown that these equations arise from non-streching invariant curve flows respectively in the three-dimensional Euclidean geometry, the two-dimensional...
Topics: Nonlinear Sciences, Mathematical Physics, Mathematics, Differential Geometry, Exactly Solvable and...
Source: http://arxiv.org/abs/1301.0180
Arxiv.org
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This paper is dedicated to provide the global solutions of algebro-geometric type for all the equations of a new commuting hierarchy containing the Hunter-Saxton (HS) equation. Our main tools include the zero curvature method to derive the HS hierarchy, the generalized Jacobian variety, the generalized Riemann theta function, the Weyl $m$-fucntions $m_\pm(x,t,z)$, and the pole motion obtained by solving an inverse problem for the Sturm-Liouville equation...
Topics: Nonlinear Sciences, Exactly Solvable and Integrable Systems
Source: http://arxiv.org/abs/1301.0690
Arxiv.org
by Jan Hrnčíř; Michael Rovatsos
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Travel sharing, i.e., the problem of finding parts of routes which can be shared by several travellers with different points of departure and destinations, is a complex multiagent problem that requires taking into account individual agents' preferences to come up with mutually acceptable joint plans. In this paper, we apply state-of-the-art planning techniques to real-world public transportation data to evaluate the feasibility of multiagent planning techniques in this domain. The potential...
Topics: Artificial Intelligence, Computing Research Repository
Source: http://arxiv.org/abs/1301.0216
Arxiv.org
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Given a set of mixtures, blind source separation attempts to retrieve the source signals without or with very little information of the the mixing process. We present a geometric approach for blind separation of nonnegative linear mixtures termed {\em facet component analysis} (FCA). The approach is based on facet identification of the underlying cone structure of the data. Earlier works focus on recovering the cone by locating its vertices (vertex component analysis or VCA) based on a mutual...
Topics: Machine Learning, Mathematics, Statistics, Numerical Analysis
Source: http://arxiv.org/abs/1301.0339
Arxiv.org
by Junchao Chen; Xiangpeng Xin; Yong Chen
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The nonlocal symmetry is derived from the known Darboux transformation (DT) of the Hirota-Satsuma coupled KdV (HS-cKdV) system, and infinitely many nonlocal symmetries are obtained by introducing some internal parameters. By extending the HS-cKdV system to an auxiliary system with five dependent variables, the prolongation is found to localize the nonlocal symmetry related to the DT. Base on the enlarged system, the finite symmetry transformations and similarity reductions about the local...
Topics: Nonlinear Sciences, Exactly Solvable and Integrable Systems
Source: http://arxiv.org/abs/1301.0438
Arxiv.org
by David Wingate; Theophane Weber
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We present a new algorithm for approximate inference in probabilistic programs, based on a stochastic gradient for variational programs. This method is efficient without restrictions on the probabilistic program; it is particularly practical for distributions which are not analytically tractable, including highly structured distributions that arise in probabilistic programs. We show how to automatically derive mean-field probabilistic programs and optimize them, and demonstrate that our...
Topics: Machine Learning, Learning, Computing Research Repository, Statistics, Artificial Intelligence
Source: http://arxiv.org/abs/1301.1299
Arxiv.org
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In this paper, we have calculated the thermodynamic properties of spin polarized strange quark matter at finite temperature in the presence of a strong magnetic field using MIT bag model. We have also computed the equation of state of spin polarized strange quark matter in the presence of strong magnetic field and finally, using this equation of states we have investigated the structure of spin polarized strange quark star at different temperatures and magnetic fields.
Topics: Astrophysics, High Energy Physics - Phenomenology, Solar and Stellar Astrophysics
Source: http://arxiv.org/abs/1301.0899
Arxiv.org
by Amarendra Badugu; Conradin Kraemer; Philipp Germann; Denis Menshykau; Dagmar Iber
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Turing models have been proposed to explain the emergence of digits during limb development. However, so far the molecular components that would give rise to Turing patterns are elusive. We have recently shown that a particular type of receptor-ligand interaction can give rise to Schnakenberg-type Turing patterns, which reproduce patterning during lung and kidney branching morphogenesis. Recent knock-out experiments have identified Smad4 as a key protein in digit patterning. We show here that...
Topics: Tissues and Organs, Quantitative Biology, Molecular Networks
Source: http://arxiv.org/abs/1301.0736
Arxiv.org
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This is the second paper of our series. In this paper, we present $UBVRI$ photometry for 234 star clusters in the field of M33. For most of these star clusters, there is photometry in only two bands in previous studies. The photometry of these star clusters is performed using archival images from the Local Group Galaxies Survey, which covers 0.8 deg$^2$ along the major axis of M33. Detailed comparisons show that, in general, our photometry is consistent with previous measurements, especially,...
Topics: Astrophysics of Galaxies, Astrophysics, Cosmology and Nongalactic Astrophysics
Source: http://arxiv.org/abs/1301.1086
Arxiv.org
by Mami Machida; Kenji E. Nakamura; Takahiro Kudoh; Takuya Akahori; Sofue Yoshiaki; Ryoji Matsumoto
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We carried out global three-dimensional magneto-hydrodynamic simulations of dynamo activities in galactic gaseous disks without assuming equatorial symmetry. Numerical results indicate the growth of azimuthal magnetic fields non-symmetric to the equatorial plane. As magneto-rotational instability (MRI) grows, the mean strength of magnetic fields is amplified until the magnetic pressure becomes as large as 10% of the gas pressure. When the local plasma $\beta$ ($ = p_{\rm gas}/p_{\rm mag}$)...
Topics: Astrophysics of Galaxies, Astrophysics
Source: http://arxiv.org/abs/1301.1414
Arxiv.org
by Kun Tian; Dewen Xiong; Zhongxing Ye
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In this paper, we assume that the filtration $\bb F$ is generated by a $d$-dimensional Brownian motion $W=(W_1,\cdots,W_d)'$ as well as an integer-valued random measure $\mu(du,dy)$. The random variable $\ttau$ is the default time and $L$ is the default loss. Let $\mathbb G=\{\scr G_t;t\geq 0\}$ be the progressive enlargement of $\bb F$ by $(\ttau,L)$, i.e, $\bb G$ is the smallest filtration including $\bb F$ such that $\ttau$ is a $\bb G$-stopping time and $L$ is $\scr G_\ttau$-measurable. We...
Topics: Mathematics, Probability
Source: http://arxiv.org/abs/1301.1119
Arxiv.org
by Paulo Shakarian; Gerardo I. Simari; Robert Schroeder
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The modeling of cascade processes in multi-agent systems in the form of complex networks has in recent years become an important topic of study due to its many applications: the adoption of commercial products, spread of disease, the diffusion of an idea, etc. In this paper, we begin by identifying a desiderata of seven properties that a framework for modeling such processes should satisfy: the ability to represent attributes of both nodes and edges, an explicit representation of time, the...
Topics: Multiagent Systems, Logic in Computer Science, Artificial Intelligence, Computing Research...
Source: http://arxiv.org/abs/1301.0302
Arxiv.org
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This paper studies a Stieltjes-type moment problem defined by the generalized lognormal distribution, a heavy-tailed distribution with applications in economics, finance and related fields. It arises as the distribution of the exponential of a random variable following a generalized error distribution, and hence figures prominently in the EGARCH model of asset price volatility. Compared to the classical lognormal distribution it has an additional shape parameter. It emerges that moment...
Topics: Mathematics, Other Statistics, Statistics, Probability
Source: http://arxiv.org/abs/1301.1277
Arxiv.org
by A. Akyuz; S. Kayaci; H. Avdan; M. E. Ozel; E. Sonbas; S. Balman
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We present results from a study of the non-nuclear discrete sources in a sample of three nearby spiral galaxies (NGC 4395, NGC 4736, and NGC 4258) based on XMM-Newton archival data supplemented with Chandra data for spectral and timing analyses. A total of 75 X-ray sources has been detected within the D25 regions of the target galaxies. The large collecting area of XMM-Newton makes the statistics sufficient to obtain spectral fitting for 16 (about 20%) of these sources. Compiling the extensive...
Topics: Astrophysics, High Energy Astrophysical Phenomena
Source: http://arxiv.org/abs/1301.1040
Arxiv.org
by M. Aghapournahr; Kh. Ahmadi-amoli; M. Y. Sadeghi
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Some affirmative answers are given to Huneke's problems. The calculation of local cohomology modules with respect to an arbitrary pair of ideals $I,J$ can be reduced to calculation of local cohomology modules with respect to a pair of ideala whose first ideal is generated by any $k$-regular sequence in $I$.
Topics: Mathematics, Commutative Algebra
Source: http://arxiv.org/abs/1301.1015
Arxiv.org
by Terrence Adams
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A technique is presented for multiplexing two ergodic measure preserving transformations together to derive a third limiting transformation. This technique is used to settle a question regarding rigidity of weak mixing transformations. Namely, given any rigidity sequence for an ergodic measure preserving transformation, there exists a weak mixing transformation which is rigid along the same sequence. This establishes a wide range of rigidity sequences for weakly mixing dynamical systems.
Topics: Mathematics, Dynamical Systems
Source: http://arxiv.org/abs/1301.0791
Arxiv.org
by Michael Mikucki; Y. C. Zhou
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Simulating protein-membrane interactions is an important and dynamic area of research. A proper definition of electrostatic forces on membrane surfaces is necessary for developing electromechanical models of protein-membrane interactions. Here we modeled the bilayer membrane as a continuum with general continuous distributions of lipids charges on membrane surfaces. A new electrostatic potential energy functional was then defined for this solvated protein-membrane system. We investigated the...
Topics: Mathematics, Quantitative Biology, Biomolecules, Analysis of PDEs
Source: http://arxiv.org/abs/1301.1104
Arxiv.org
by Andrey Soldatenkov; Misha Verbitsky
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A hypercomplex manifold is a manifold equipped with a triple of complex structures satisfying the quaternionic relations. A holomorphic Lagrangian variety on a hypercomplex manifold with trivial canonical bundle is a holomorphic subvariety which is calibrated by a form associated with the holomorphic volume form; this notion is a generalization of the usual holomorphic Lagrangian subvarieties known in hyperkaehler geometry. An HKT (hyperkaehler with torsion) metric on a hypercomplex manifold is...
Topics: Mathematics, Differential Geometry, Algebraic Geometry
Source: http://arxiv.org/abs/1301.0175
Arxiv.org
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We study the existence of non-collision periodic solutions with Newtonian potentials for the following planar restricted 4-body problems: Assume that the given positive masses $m_{1},m_{2},m_{3}$ in a Lagrange configuration move in circular obits around their center of masses, the sufficiently small mass moves around some body. Using variational minimizing methods, we prove the existence of minimizers for the Lagrangian action on anti-T/2 symmetric loop spaces. Moreover, we prove the minimizers...
Topics: Mathematical Physics, Mathematics
Source: http://arxiv.org/abs/1301.0767
Arxiv.org
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We find the height of the third fission barrier $B_{III}$ and energy of the third minimum $E_{III}$ in $^{232}$Th using the macroscopic - microscopic model, very well tested in this region of nuclei. For the first time it is done on an 8-dimensional deformation hypercube. The dipole distortion is included among the shape variables to assure that no important shapes are missed. The saddle point is found on a lattice containing more than 50 million points by the immersion water flow (IWF) method....
Topic: Nuclear Theory
Source: http://arxiv.org/abs/1301.0713
Arxiv.org
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Prion diseases caused by the conversion from a soluble normal cellular prion protein into insoluble abnormally folded infectious prions, are invariably fatal and highly infectious degenerative diseases that affect a wide variety of mammalian species. The palindrome and the Glycine-rich conserved segment in the hydrophobic region 109-136 control the conversion from normal prion protein to form into diseased prions. This paper gives detailed reviews on the 109-136 region and presents the studies...
Topics: Quantitative Biology, Physics, Biomolecules, Biological Physics
Source: http://arxiv.org/abs/1301.0117
Arxiv.org
by Eric J. Lentz; Stephen W. Bruenn; J. Austin Harris; Merek Austin Chertkow; W. Raphael Hix; Anthony Mezzacappa; O. E. Bronson Messer; John M. Bondin; Pedro Marronetti; Christopher M. Mauney; Konstantin N. Yakunin
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Ascertaining the core-collapse supernova mechanism is a complex, and yet unsolved, problem dependent on the interaction of general relativity, hydrodynamics, neutrino transport, neutrino-matter interactions, and nuclear equations of state and reaction kinetics. Ab initio modeling of core-collapse supernovae and their nucleosynthetic outcomes requires care in the coupling and approximations of the physical components. We have built our multi-physics CHIMERA code for supernova modeling in 1-, 2-,...
Topics: Astrophysics, Solar and Stellar Astrophysics
Source: http://arxiv.org/abs/1301.1326
Arxiv.org
by Andrey V. Tsiganov
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We discuss trivial deformations of the canonical Poisson brackets associated with the Toda lattices, relativistic Toda lattices, Henon-Heiles, rational Calogero-Moser and Ruijsenaars-Schneider systems and apply one of these deformations to construct a new trivial family of noncommutative integrable systems.
Topics: Nonlinear Sciences, Mathematical Physics, Mathematics, Dynamical Systems, Exactly Solvable and...
Source: http://arxiv.org/abs/1301.1432
Arxiv.org
by Said Aissaoui; Abdenacer Makhlouf
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The purpose of this paper is to investigate finite-dimensional superbialgebras and Hopf superalgebras. We study connected superbialgebras and provide a classification of non-trivial superbialgebras and Hopf superalgebras in dimension $n$ with $n\leq 4$.
Topics: Mathematical Physics, Mathematics, Rings and Algebras, Quantum Algebra
Source: http://arxiv.org/abs/1301.0838
Arxiv.org
by L. Ts. Adzhemyan; S. V. Novikov; L. Sladkoff
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A new method based on the R'-operation of the renormalization theory is proposed for the numerical calculation of the renormalization constants in the theory of critical behaviour. The problem of finding residues of the poles of the Green's functions at \epsilon = 0, where \epsilon = 4 - d, is reduced to the evaluation of multiple UV-finite integrals, which can be performed by means of standard integration programs. The method is used to calculate the renormalization group functions of the...
Source: http://arxiv.org/abs/0808.1347v1
Arxiv.org
by Margit Pap
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In this paper we formulate a weighted version of minimum problem (1.4) on the sphere and we show that, for $K\le L$, if $\set{\phi_k}^K_{k=1}$ consists of the spherical functions with degree less than $N$ we can localize the points $(\xi_1,...,\xi_L)$ on the sphere so that the solution of this problem is the simplest possible. This localization is connected to the discrete orthogonality of the spherical functions which was proved in [3]. Using these points we construct a frame system and a...
Source: http://arxiv.org/abs/0808.1173v1
Arxiv.org
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If $X$ is a smooth curve such that the minimal degree of its plane models is not too small compared with its genus, then $X$ has been known to be a double cover of another smooth curve $Y$ under some mild condition on the genera. However there are no results yet for the minimal degrees of plane models of double covers except some special cases. In this paper, we give upper and lower bounds for the minimal degree of plane models of the double cover $X$ in terms of the gonality of the base curve...
Source: http://arxiv.org/abs/0809.1853v2
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by Wilson Wong; Wei Liu; Mohammed Bennamoun
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Most research related to unithood were conducted as part of a larger effort for the determination of termhood. Consequently, novelties are rare in this small sub-field of term extraction. In addition, existing work were mostly empirically motivated and derived. We propose a new probabilistically-derived measure, independent of any influences of termhood, that provides dedicated measures to gather linguistic evidence from parsed text and statistical evidence from Google search engine for the...
Source: http://arxiv.org/abs/0810.0139v1
Arxiv.org
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I will review heavy baryon chiral perturbation theory for the nucleon delta degrees of freedom and then examine the recent dynamical lattice calculations of the nucleon mass from the BMW, ETM, JLQCD, LHP, MILC, NPLQCD, PACS-CS, QCDSF/UKQCD and RBC/UKQCD Collaborations. Performing the chiral extrapolations of these results, one finds remarkable agreement with the physical nucleon mass, from each lattice data set. However, a careful examination of the lattice data and the resulting extrapolation...
Source: http://arxiv.org/abs/0810.0663v4
Arxiv.org
by Jean-Francois Bony; Dietrich Hafner
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We consider the quadratically semilinear wave equation on R^d, d>=3, equipped with a Riemannian metric. This metric is non-trapping and approaches the Euclidean metric polynomially at infinity. Using Mourre estimates and the Kato theory of smoothness, we obtain a Keel-Smith-Sogge type inequality for the linear equation. Thanks to this estimate, we prove long time existence (d=3) and global existence (d>3) for the nonlinear problem with small initial data.
Source: http://arxiv.org/abs/0810.0464v1
Arxiv.org
by Alfredo Brega; Leandro Cagliero
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In this paper we obtain the LU-decomposition of a noncommutative linear system of equations that, in the rank one case, characterizes the image of the Lepowsky homomorphism $U(\lieg)^{K}\to U(\liek)^{M}\otimes U(\liea)$. This LU-decomposition can be transformed into very simple matrix identities, where the entries of the matrices involved belong to a special class of Jacobi polynomials. In particular, each entry of the L part of the original system is expressed in terms of a single...
Source: http://arxiv.org/abs/0810.2771v1
Arxiv.org
by William Y. C. Chen; Henry Y. Gao; Jia He
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In this paper, we extend the notion of labeled partitions with ordinary permutations to colored permutations in the sense that the colors are endowed with a cyclic structure. We use labeled partitions with colored permutations to derive the generating function of the $\mathrm{fmaj}_k$ indices of colored permutations. The second result is a combinatorial treatment of a relation on the q-derangement numbers with respect to colored permutations which leads to the formula of Chow for signed...
Source: http://arxiv.org/abs/0810.3388v1
Arxiv.org
by E. Schinnerer; C. L. Carilli; P. Capak; A. Martinez-Sansigre; N. Z. Scoville; V. Smolcic; Y. Taniguchi; M. S. Yun; F. Bertoldi; O. Le Fevre; L. de Ravel
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We report the detection of CO molecular line emission in the z=4.5 millimeter-detected galaxy COSMOS_J100054+023436 (hereafter: J100+0234) using the IRAM Plateau de Bure interferometer (PdBI) and NRAO's Very Large Array (VLA). The CO(4-3) line as observed with PdBI has a full line width of ~1000 km/s, an integrated line flux of 0.66 Jy km/s, and a CO luminosity of 3.2e10 L_sun. Comparison to the 3.3sigma detection of the CO(2-1) line emission with the VLA suggests that the molecular gas is...
Source: http://arxiv.org/abs/0810.3405v1
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by Samantha K. Hewamanage
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Many new physics models predict mechanisms that could produce a photon and jets signature. We search in the photon + jets channel, independent of any model, for new physics using CDF Run II data collected at the Fermilab Tevatron from p-pbar collisions at a center of mass energy of 1.96 TeV. A variety of techniques are applied to estimate the standard model expectation and non-collision backgrounds. We examine several kinematic distributions including transverse energy of the photon and...
Source: http://arxiv.org/abs/0810.3690v1
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by Julien Malzac; Renaud Belmont
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We study the effects of synchrotron self-absorption on the Comptonising electron distribution in the magnetised corona of accreting black holes. We solve the kinetic equations assuming that power is supplied to the coronal electrons through Coulomb collisions with a population of hot protons and/or through the injection of non-thermal energetic electrons by some unspecified acceleration process. We compute numerically the steady state particle distributions and escaping photon spectra. These...
Source: http://arxiv.org/abs/0810.4458v1
Arxiv.org
by D. S. Simon; A. V. Sergienko; T. B. Bahder
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We consider Mach-Zehnder and Hong-Ou-Mandel interferometers with nonclassical states of light as input, and study the effect that dispersion inside the interferometer has on the sensitivity of phase measurements. We study in detail a number of different one- and two-photon input states, including Fock, dual Fock, N00N states, and photon pairs from parametric downconversion. Assuming there is a phase shift $\phi_0$ in one arm of the interferometer, we compute the probabilities of measurement...
Source: http://arxiv.org/abs/0810.4501v1
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We construct a sequence of compact embedded minimal disks in the unit ball in Euclidean 3-space whose boundaries are in the boundary of the ball and where the curvatures blow up at every point of a line segment of the vertical axis, extending from the origin. We further study the transversal structure of the minimal limit lamination and find removable singularities along the line segment and a non-removable singularity at the origin. This extends a result of Colding and Minicozzi where they...
Source: http://arxiv.org/abs/0902.3641v2
Arxiv.org
by C. Pappas; E. Lelievre-Berna; P. Falus; P. M. Bentley; E. Moskvin; S. Grigoriev; P. Fouquet; B. Farago
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We present a comprehensive study of chiral fluctuations in the reference helimagnet MnSi by polarized neutron scattering and Neutron Spin Echo spectroscopy, which reveals the existence of a completely left-handed and dynamically disordered phase. This phase may be identified as a spontaneous skyrmion phase: it appears in a limited temperature range just above the helical transition Tc and coexists with the helical phase at Tc.
Source: http://arxiv.org/abs/0902.3603v2
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We make remarks on Ristroph and Zhang's [{\it Phys. Rev. Lett.} 101, 194502 (2008)] paper.
Source: http://arxiv.org/abs/0902.4739v3
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by J. Tempere; V. N. Gladilin; I. F. Silvera; J. T. Devreese; V. V. Moshchalkov
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We show that on superconducting spherical nanoshells, the co-existence of the Meissner state with a variety of vortex patterns drives the phase transition to higher magnetic fields. The spherical geometry leads to a Magnus-Lorentz force pushing the nucleating vortices and antivortices towards the poles, overcoming local pinning centers, preventing vortex-antivortex recombination and leading to the appearance of a Meissner belt around the sphere's equator. In sufficiently small and thin...
Source: http://arxiv.org/abs/0903.2800v2
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by M. Mugrauer; G. Avila
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A new spectrograph (FIASCO) is in operation at the 0.9m telescope of the University Observatory Jena. This article describes the characterization of the instrument and reports its first astronomical observations, among those Li (670.8nm) detection in the atmosphere of young stars, and the simultaneous photometric and spectroscopic monitoring of variable stars.
Source: http://arxiv.org/abs/0903.4441v1
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We investigate electron transport through a diatomic molecule parallelly coupled to infinite source and drain contacts. We utilize a model Hamiltonian involving a Hubbard term in which the contacts are modeled using recently developed complex source and sink potentials. The zero bias transmission spectrum for a symmetrically coupled system as a function of the Fermi energy acquires a Fano lineshape as the Hubbard interaction is turned on. For large values of $U$, the Fano lineshape broadens and...
Source: http://arxiv.org/abs/0903.4593v1
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We employ an Artificial Neural Network (ANN) based technique to develop a pipeline for automated segregation of stars from the galaxies to be observed by Tel-Aviv University Ultra-Violet Experiment (TAUVEX). We use synthetic spectra of stars from UVBLUE library and selected International Ultraviolet Explorer (IUE) low resolution spectra for galaxies in the ultraviolet (UV) region from 1250 to 3220\AA as the training set and IUE low-resolution spectra for both the stars and the galaxies as the...
Source: http://arxiv.org/abs/0903.5145v1
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by K. Y. L. Su; G. H. Rieke; K. R. Stapelfeldt; R. Malhotra; G. Bryden; P. S. Smith; K. A. Misselt; A. Moro-Martin; J. P. Williams
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We have obtained a full suite of Spitzer observations to characterize the debris disk around HR 8799 and to explore how its properties are related to the recently discovered set of three massive planets orbiting the star. We distinguish three components to the debris system: (1) warm dust (T ~150 K) orbiting within the innermost planet; (2) a broad zone of cold dust (T ~45 K) with a sharp inner edge, orbiting just outside the outermost planet and presumably sculpted by it; and (3) a dramatic...
Source: http://arxiv.org/abs/0909.2687v1
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by S. Vennes; A. Kawka; T. R. Vaccaro; N. M. Silvestri
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We re-examine the properties of the high-velocity and extremely low mass white dwarf LP 400-22 and its close companion. Based on an extended observation timeline we determined a binary period of P= 1.01016 d, somewhat longer than the previously published period, and a mass function f(M_2)= 0.180 M_solar implying a mass for the companion M_2 > 0.41 M_solar. We also re-appraised the mass and cooling age of the white dwarf using low-metallicity (Z=0.001) evolutionary models appropriate for an...
Source: http://arxiv.org/abs/0909.3261v2
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We looked at the orbital motions of test particles according to the External Field Effect (EFE) predicted by the MOdified Newtonian Dynamics (MOND) in the Oort cloud which falls in the deep MONDian regime (r\approx 50-150 kAU). Concerning the interpolating function \mu(x), we extensively used the forms \mu_1=1/(1+x),\mu_2=x/(1+x^2)^1/2,\mu_3/2=x/(1+x^3/2)^2/3. We integrated both the MOND and the Newtonian equations of motion in Cartesian coordinates sharing the same initial conditions. We...
Source: http://arxiv.org/abs/0909.3464v1
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by H. M. Bui; M. B. Milinovich
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Let C(q,+) be the set of even, primitive Dirichlet characters (mod q). Using the mollifier method we show that L^{(k)}(1/2,chi) is not equal to zero for almost all the characters chi in C(q,+) when k and q are large. Here, L^{(k)}(s,chi) is the k-th derivative of of the Dirichlet L-function L(s,chi).
Source: http://arxiv.org/abs/0910.2051v3
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by N. Tsoneva; H. Lenske
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The electric quadrupole response is investigated theoretically by HFB and QPM calculations along the Sn isotopic chain with special emphasis on excitations above the first collective state and below the particle threshold. Depending on the asymmetry, additional strength clustering as a group of states similar to the known PDR mode is found. The spectral distributions and electric response functions are discussed. The transition densities of these Pygmy Quadrupole Resonances (PQR) states are...
Source: http://arxiv.org/abs/0910.3487v2
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by François Portier; Bernard Delyon
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In this paper we offer a complete methodology for sufficient dimension reduction called the test function (TF). TF provides a new family of methods for the estimation of the central subspace (CS) based on the introduction of a nonlinear transformation of the response. Theoretical background of TF is developed under weaker conditions than the existing methods. By considering order 1 and 2 conditional moments of the predictor given the response, we divide TF in two classes. In each class we...
Source: http://arxiv.org/abs/1106.1056v1
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by Amir Khamseh; Gholamreza Omidi
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In this paper, we study the concept of edge-group choosability of graphs. We say that G is edge k-group choosable if its line graph is k-group choosable. An edge-group choosability version of Vizing conjecture is given. The evidence of our claim are graphs with maximum degree less than 4, planar graphs with maximum degree at least 11, planar graphs without small cycles, outerplanar graphs and near-outerplanar graphs.
Source: http://arxiv.org/abs/1106.1110v1
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by John J. Cowan; Ian U. Roederer; Christopher Sneden; James E. Lawler
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Abundance observations indicate the presence of rapid-neutron capture (i.e., r-process) elements in old Galactic halo and globular cluster stars. Recent observations of the r-process-enriched star BD +17 3248 include new abundance determinations for the neutron-capture elements Cd I (Z=48), Lu II (Z = 71) and Os II (Z = 76), the first detections of these elements in metal-poor r-process-enriched halo stars. Combining these and previous observations, we have now detected 32 n-capture elements in...
Source: http://arxiv.org/abs/1106.1109v1
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by Alex Shkotin; Vladimir Ryakhovsky; Dmitry Kudryavtsev
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This paper presents our work on development of OWL-driven systems for formal representation and reasoning about terminological knowledge and facts in petrology. The long-term aim of our project is to provide solid foundations for a large-scale integration of various kinds of knowledge, including basic terms, rock classification algorithms, findings and reports. We describe three steps we have taken towards that goal here. First, we develop a semi-automated procedure for transforming a database...
Source: http://arxiv.org/abs/1106.1510v1
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by Gianluca Geloni; Vitali Kocharyan; Evgeni Saldin
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The possibility of producing highly circularly polarized X-ray radiation, especially in the soft X-ray region, is an important asset at XFELs. However, the baseline of the European XFEL, including the soft X-ray SASE3 line, foresees planar undulators only. The lowest-risk strategy for implementing polarization control at SASE3 involves adding an APPLE II-type undulator at the end of the planar undulator, to exploit the microbunching from the baseline FEL. 5m-long APPLE II undulators are...
Source: http://arxiv.org/abs/1106.1776v1
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by Suparno Satira; Sparisoma Viridi; Freddy P Zen
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Simulation of a system consisted of free particle bouncing on a vertically vibrated based is performed. Two different states, which are steady and unsteady energy transfer state are found. The vibrating based is hold at constant vibration frequency $f = 0.1$ as the vibration amplitude $A$ varied. Sinusoidal form is used. Granular temperature $T_g$ as function of based velocity and coefficient of restitution is used but shown no role in determining energy transfer state of the system. Peak of...
Source: http://arxiv.org/abs/1106.1772v1
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by S. Kilpelainen; Y. -W. Lu; F. Tuomisto; J. Slotte; A. Nylandsted Larsen
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Novel solar cell materials consisting of Si nanoparticles embedded in SiO2 layers have been studied using positron annihilation spectroscopy in Doppler broadening mode, and photoluminescence. Two positron-trapping interface states are observed after high temperature annealing at 1100{\deg}C. One of the states is attributed to the (SiO2/Si bulk) interface and the other to the interface between the Si nanoparticles and SiO2. A small reduction in positron trapping into these states is observed...
Source: http://arxiv.org/abs/1106.1753v1
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by H. Blockeel; L. Dehaspe; B. Demoen; G. Janssens; J. Ramon; H. Vandecasteele
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Inductive logic programming, or relational learning, is a powerful paradigm for machine learning or data mining. However, in order for ILP to become practically useful, the efficiency of ILP systems must improve substantially. To this end, the notion of a query pack is introduced: it structures sets of similar queries. Furthermore, a mechanism is described for executing such query packs. A complexity analysis shows that considerable efficiency improvements can be achieved through the use of...
Source: http://arxiv.org/abs/1106.1803v1
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by Jungkai Alfred Chen
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We show that terminal 3-fold divisorial contraction to a point of index $>1$ with non-minimal discrepancy may be factored into a sequence of flips, flops and divisorial contractions to a point with minimal discrepancies.
Source: http://arxiv.org/abs/1106.1705v1
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We study the relation between a complex projective set C in CP^n and the set R in RP^(2n+1) defined by viewing each equation of C as a pair of real equations. Once C is presented by quadratic equations, we can apply a spectral sequence to efficiently compute the homology of R; using the fact that the (Z_2)-cohomology of R is a free H*(C)-module with two generators we can in principle reconstruct the homology of C. Explicit computations for the intersection of two complex quadrics are presented.
Source: http://arxiv.org/abs/1106.1828v1
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by Gia Dvali; Cesar Gomez; Slava Mukhanov
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We give a simple argument showing that in any sensible quantum field theory the masses of black holes cannot assume continuous values and must be quantized. Our proof solely relies on Poincare-invariance of the asymptotic background, and is insensitive to geometric characteristics of black holes or other peculiarities of the short distance physics. Therefore, our results are equally-applicable to any other localized objects on asymptotically Poincare-invariant space, such as classicalons. By...
Source: http://arxiv.org/abs/1106.5894v1
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by Pierre Dèbes; François Legrand
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The central topic is this question: is a given $k$-\'etale algebra $\prod_lE_l/k$ the specialization of a given $k$-cover $f:X\rightarrow B$ at some point $t_0\in B(k)$? Our main tool is a {\it twisting lemma} that reduces the problem to finding $k$-rational points on a certain $k$-variety. Previous forms of this twisting lemma are generalized and unified. New applications are given: a Grunwald form of Hilbert's irreducibility theorem over number fields, a non-Galois variant of the Tchebotarev...
Source: http://arxiv.org/abs/1106.6154v1
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by N. Haba; K. Kaneta; S. Matsumoto; T. Nabeshima
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It is important to obtain effective operators by integrating out high energy degrees of freedom in physics. We suggest a general method of calculating accurate irrelevant operators in a scattering process without use of equation of motions. By using this method, for example, we will represent a complete set of dimension six operators in QCD, which are induced from physics beyond the standard model, supersymmetry and universal extra dimension. We will also show an example of effective anomalous...
Source: http://arxiv.org/abs/1106.6106v1
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by Daniel J. Mortlock; Stephen J. Warren; Bram P. Venemans; Mitesh Patel; Paul C. Hewett; Richard G. McMahon; Chris Simpson; Tom Theuns; Eduardo A. Gonzales-Solares; Andy Adamson; Simon Dye; Nigel C. Hambly; Paul Hirst; Mike J. Irwin; Ernst Kuiper; Andy Lawrence; Huub J. A. Rottgering
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The intergalactic medium was not completely reionized until approximately a billion years after the Big Bang, as revealed by observations of quasars with redshifts of less than 6.5. It has been difficult to probe to higher redshifts, however, because quasars have historically been identified in optical surveys, which are insensitive to sources at redshifts exceeding 6.5. Here we report observations of a quasar (ULAS J112001.48+064124.3) at a redshift of 7.085, which is 0.77 billion years after...
Source: http://arxiv.org/abs/1106.6088v1
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by Spiro Karigiannis; Maung Min-Oo
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This paper is a continuation of math.DG/0408005. We first construct special Lagrangian submanifolds of the Ricci-flat Stenzel metric (of holonomy SU(n)) on the cotangent bundle of S^n by looking at the conormal bundle of appropriate submanifolds of S^n. We find that the condition for the conormal bundle to be special Lagrangian is the same as that discovered by Harvey-Lawson for submanifolds in R^n in their pioneering paper. We also construct calibrated submanifolds in complete metrics with...
Source: http://arxiv.org/abs/math/0412312v2
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by Arnab Chatterjee; Bikas K. Chakrabarti
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We study here numerically the behavior of an ideal gas like model of markets having only one non-consumable commodity. We investigate the behavior of the steady-state distributions of money, commodity and total wealth, as the dynamics of trading or exchange of money and commodity proceeds, with local (in time) fluctuations in the price of the commodity. These distributions are studied in markets with agents having uniform and random saving factors. The self-organizing features in money...
Source: http://arxiv.org/abs/physics/0609069v2
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by K. Gesicki; A. A. Zijlstra
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We compare the mass distribution of central stars of planetary nebulae (CSPN) with those of their progeny, white dwarfs (WD). We use a dynamical method to measure masses with an uncertainty of 0.02 M$_\odot$. The CSPN mass distribution is sharply peaked at $0.61 \rm M_\odot$. The WD distribution peaks at lower masses ($0.58 \rm M_\odot$) and shows a much broader range of masses. Some of the difference can be explained if the early post-AGB evolution is faster than predicted by the...
Source: http://arxiv.org/abs/0704.0620v1
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We introduce a finite volume scheme for the two-dimensional incompressible Navier-Stokes equations. We use a triangular mesh. The unknowns for the velocity and pressure are respectively piecewise constant and affine. We use a projection method to deal with the incompressibility constraint. We show that the differential operators in the Navier-Stokes equations and their discrete counterparts share similar properties. In particular we state an inf-sup (Babuska-Brezzi) condition. Using these...
Source: http://arxiv.org/abs/0704.0783v2