Skip to main content
SHOW DETAILS
eye
Title
Date Archived
Creator
PubMed Central
by Khalaj, Alireza; Bakhtiari, Jalal; Niasari-Naslaji, Amir
texts

eye 48

favorite 0

comment 0

This article is from BMC Veterinary Research , volume 8 . Abstract Background: Single incision laparoscopic surgery (SILS) is a newly growing technique to replace a more invasive conventional multiple portal laparoscopic surgery. The objective of this study was to compare single (SILS) with three portal (Conventional) laparoscopic splenectomy in dogs. Mongrel dogs (n = 18), weighting 15 ± 3 kg, were selected for this study (n = 12 SILS; n = 6 conventional). The area from...
Source: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3585911
Arxiv.org
by Gerardo Chacòn; Emmanuel Fricain; Mahmood Shabankhah
texts

eye 60

favorite 0

comment 0

In this paper, using a generalization of a Richter and Sundberg representation theorem, we give a new characterization of Carleson measures for the Dirichlet-type space $\mathcal D(\mu)$ when $\mu$ is a finite sum of point masses. A reproducing kernel thesis result is also established in this case.
Source: http://arxiv.org/abs/1009.1801v3
Arxiv.org
by Shin-ichi Ohta; Karl-Theodor Sturm
texts

eye 30

favorite 0

comment 0

We study contractivity properties of gradient flows for functions on normed spaces or, more generally, on Finsler manifolds. Contractivity of the flows turns out to be equivalent to a new notion of convexity for the functions. This is different from the usual convexity along geodesics in non-Riemannian Finsler manifolds. As an application, we show that the heat flow on Minkowski normed spaces other than inner product spaces is not contractive with respect to the quadratic Wasserstein distance.
Source: http://arxiv.org/abs/1009.2312v4
Arxiv.org
by Martin Bridson; Jose Burillo; Murray Elder; Zoran Sunic
texts

eye 49

favorite 0

comment 0

This note records some observations concerning geodesic growth functions. If a nilpotent group is not virtually cyclic then it has exponential geodesic growth with respect to all finite generating sets. On the other hand, if a finitely generated group $G$ has an element whose normal closure is abelian and of finite index, then $G$ has a finite generating set with respect to which the geodesic growth is polynomial (this includes all virtually cyclic groups).
Source: http://arxiv.org/abs/1009.5051v3
Arxiv.org
texts

eye 42

favorite 0

comment 0

Generalizing a definition of homotopy fiber products of model categories, we give a definition of the homotopy limit of a diagram of left Quillen functors between model categories. As has been previously shown for homotopy fiber products, we prove that such a homotopy limit does in fact correspond to the usual homotopy limit, when we work in a more general model for homotopy theories in which they can be regarded as objects of a model category.
Source: http://arxiv.org/abs/1010.0717v2
Arxiv.org
by Jelena Bradic; Jianqing Fan; Jiancheng Jiang
texts

eye 49

favorite 0

comment 0

High throughput genetic sequencing arrays with thousands of measurements per sample and a great amount of related censored clinical data have increased demanding need for better measurement specific model selection. In this paper we establish strong oracle properties of nonconcave penalized methods for nonpolynomial (NP) dimensional data with censoring in the framework of Cox's proportional hazards model. A class of folded-concave penalties are employed and both LASSO and SCAD are discussed...
Source: http://arxiv.org/abs/1010.5233v3
Arxiv.org
by H. A. Erbay; A. Erkip; G. M. Muslu
texts

eye 56

favorite 0

comment 0

This paper studies the Cauchy problem for a one-dimensional nonlinear peridynamic model describing the dynamic response of an infinitely long elastic bar. The issues of local well-posedness and smoothness of the solutions are discussed. The existence of a global solution is proved first in the sublinear case and then for nonlinearities of degree at most three. The conditions for finite-time blow-up of solutions are established.
Source: http://arxiv.org/abs/1010.5689v2
Arxiv.org
by Ulrich Faigle; Alexander Schönhuth
texts

eye 39

favorite 0

comment 0

While the standard approach to quantum systems studies length preserving linear transformations of wave functions, the Markov picture focuses on trace preserving operators on the space of Hermitian (self-adjoint) matrices. The Markov approach extends the standard one and provides a refined analysis of measurements and quantum Markov chains. In particular, Bell's inequality becomes structurally clear. It turns out that hidden state models are natural in the Markov context. In particular, a...
Source: http://arxiv.org/abs/1011.1295v2
We numerically investigate the impact of GTR on the orbital part of the satellite-to-satellite range \rho and range-rate \dot\rho of the twin GRACE A/B spacecrafts through their dynamical equations of motion integrated in an Earth-centered frame over a time span \Delta t=1 d. Instead, the GTR effects connected with the propagation of the electromagnetic waves linking the spacecrafts are neglected. The present-day accuracies in measuring the GRACE biased range and range-rate are \sigma_\rho\sim...
Source: http://arxiv.org/abs/1011.1916v5
Arxiv.org
by Jeffrey S. Case
texts

eye 50

favorite 0

comment 0

Smooth metric measure spaces have been studied from the two different perspectives of Bakry-\'Emery and Chang-Gursky-Yang, both of which are closely related to work of Perelman on the Ricci flow. These perspectives include a generalization of the Ricci curvature and the associated quasi-Einstein metrics, which include Einstein metrics, conformally Einstein metrics, gradient Ricci solitons, and static metrics. In this article, we describe a natural perspective on smooth metric measure spaces...
Source: http://arxiv.org/abs/1011.2723v3
Arxiv.org
by Matthias R Gaberdiel; Rajesh Gopakumar
texts

eye 44

favorite 0

comment 0

We propose a duality between the 2d W_N minimal models in the large N 't Hooft limit, and a family of higher spin theories on AdS_3. The 2d CFTs can be described as WZW coset models, and include, for N=2, the usual Virasoro unitary series. The dual bulk theory contains, in addition to the massless higher spin fields, two complex scalars (of equal mass). The mass is directly related to the 't Hooft coupling constant of the dual CFT. We give convincing evidence that the spectra of the two...
Source: http://arxiv.org/abs/1011.2986v4
Arxiv.org
by B. Alles; S. Gunduc; Y. Gunduc
texts

eye 44

favorite 0

comment 0

The conditions under which entanglement becomes maximal are sought in the general one--dimensional quantum random walk with two walkers. Moreover, a one--dimensional shift operator for the two walkers is introduced and its performance in generating entanglement is analyzed as a function of several free parameters, some of them coming from the shift operator itself and some others from the coin operator. To simplify the investigation an averaged entanglement is defined.
Source: http://arxiv.org/abs/1011.6023v2
Arxiv.org
by David Futer; François Guéritaud
texts

eye 57

favorite 0

comment 0

Agol recently introduced the notion of a veering triangulation, and showed that such triangulations naturally arise as layered triangulations of fibered hyperbolic 3-manifolds. We prove, by a constructive argument, that every veering triangulation admits positive angle structures, recovering a result of Hodgson, Rubinstein, Segerman, and Tillmann. Our construction leads to explicit lower bounds on the smallest angle in this positive angle structure, and to information about angled holonomy of...
Source: http://arxiv.org/abs/1012.5134v2
Arxiv.org
by R. Mikulevicius; H. Pragarauskas
texts

eye 63

favorite 0

comment 0

The existence and uniqueness in fractional Sobolev spaces of the Cauchy problem to a stochastic parabolic integro-differential equation is investigated. A model problem with coefficients independent of space variable is considered. The equation arises, for example, in a filtering problem with a jump signal and jump observation process.
Source: http://arxiv.org/abs/1012.5816v3
Arxiv.org
by Melchior Grutzmann
texts

eye 76

favorite 0

comment 0

We generalize Hansen--Strobl's definition of $H$-twisted Courant algebroid such that the twist $H$ of the Jacobi identity is a 4-form in the kernel of the anchor map and is closed under a naturally occurring exterior covariant derivative. We give examples and define a cohomology.
Source: http://arxiv.org/abs/1101.0993v2
Arxiv.org
texts

eye 38

favorite 0

comment 0

In this work we consider the entropy-corrected version of interacting holographic dark energy (HDE), in the non-flat universe enclosed by apparent horizon. Two corrections of entropy so-called logarithmic 'LEC' and power-law 'PLEC' in HDE model with apparent horizon as an IR-cutoff are studied. The ratio of dark matter to dark energy densities $u$, equation of state parameter $w_D$ and deceleration parameter $q$ are obtained. We show that the cosmic coincidence is satisfied for both interacting...
Source: http://arxiv.org/abs/1101.1632v2
Arxiv.org
by David M. Roberts
texts

eye 38

favorite 0

comment 0

In this article we review the theory of anafunctors introduced by Makkai and Bartels, and show that given a subcanonical site S, one can form a bicategorical localisation of various 2-categories of internal categories or groupoids at weak equivalences using anafunctors as 1-arrows. This unifies a number of proofs throughout the literature, using the fewest assumptions possible on S.
Source: http://arxiv.org/abs/1101.2363v3
Arxiv.org
by Rafe Jones; Michelle Manes
texts

eye 54

favorite 0

comment 0

For a number field K with absolute Galois group G_K, we consider the action of G_K on the infinite tree of preimages of a point in K under a degree-two rational function phi, with particular attention to the case when phi commutes with a non-trivial Mobius transfomation. In a sense this is a dynamical systems analogue to the l-adic Galois representation attached to an elliptic curve, with particular attention to the CM case. Using a result about the discriminants of numerators of iterates of...
Source: http://arxiv.org/abs/1101.4339v3
Arxiv.org
texts

eye 46

favorite 0

comment 0

We define a notion of network capacity region of networks that generalizes the notion of network capacity defined by Cannons et al. and prove its notable properties such as closedness, boundedness and convexity when the finite field is fixed. We show that the network routing capacity region is a computable rational polytope and provide exact algorithms and approximation heuristics for computing the region. We define the semi-network linear coding capacity region, with respect to a fixed finite...
Source: http://arxiv.org/abs/1103.0361v2
Arxiv.org
texts

eye 43

favorite 0

comment 0

U(1) Chern-Simons theory is quantized canonically on manifolds of the form $M=\mathbb{R}\times\Sigma$, where $\Sigma$ is a closed orientable surface. In particular, we investigate the role of mapping class group of $\Sigma$ in the process of quantization. We show that, by requiring the quantum states to form representation of the holonomy group and the large gauge transformation group, both of which are deformed by quantum effect, the mapping class group can be consistently represented,...
Source: http://arxiv.org/abs/1103.2820v2
Arxiv.org
by Yutaka Ohira; Kazunori Kohri; Norita Kawanaka
texts

eye 42

favorite 0

comment 0

Recently, the gamma-ray telescopes AGILE and Fermi observed several middle-aged supernova remnants (SNRs) interacting with molecular clouds. A plausible emission mechanism of the gamma rays is the decay of neutral pions produced by cosmic ray (CR) nuclei (hadronic processes). However, observations do not rule out contributions from bremsstrahlung emission due to CR electrons. TeV gamma-ray telescopes also observed many SNRs and discovered many unidentified sources. It is still unclear whether...
Source: http://arxiv.org/abs/1103.4140v2
Arxiv.org
texts

eye 85

favorite 0

comment 0

In this paper, we study resource allocation and adaptive modulation in SC-FDMA which is adopted as the multiple access scheme for the uplink in the 3GPP-LTE standard. A sum-utility maximization (SUmax), and a joint adaptive modulation and sum-cost minimization (JAMSCmin) problems are considered. Unlike OFDMA, in addition to the restriction of allocating a sub-channel to one user at most, the multiple sub-channels allocated to a user in SC-FDMA should be consecutive as well. This renders the...
Source: http://arxiv.org/abs/1103.4547v4
Arxiv.org
by Osamu Fujino; Yoshinori Gongyo
texts

eye 65

favorite 0

comment 0

We prove the finiteness of log pluricanonical representations for projective log canonical pairs with semi-ample log canonical divisor. As a corollary, we obtain that the log canonical divisor of a projective semi log canonical pair is semi-ample if and only if so is the log canonical divisor of its normalization. We also treat many other applications.
Source: http://arxiv.org/abs/1104.0361v3
Arxiv.org
by Anne Schilling; Peter Tingley
texts

eye 61

favorite 0

comment 0

It has previously been shown that, at least for non-exceptional Kac-Moody Lie algebras, there is a close connection between Demazure crystals and tensor products of Kirillov-Reshetikhin crystals. In particular, certain Demazure crystals are isomorphic as classical crystals to tensor products of Kirillov-Reshetikhin crystals via a canonically chosen isomorphism. Here we show that this isomorphism intertwines the natural affine grading on Demazure crystals with a combinatorially defined energy...
Source: http://arxiv.org/abs/1104.2359v2
Arxiv.org
by Nora Seeliger
texts

eye 67

favorite 0

comment 0

We study group models for fusion systems and construct homology decompositions for the models of Robinson and Leary-Stancu type.
Source: http://arxiv.org/abs/1104.2290v3
Arxiv.org
by Kristian Ranestad; Frank-Olaf Schreyer
texts

eye 46

favorite 0

comment 0

A collection of n distinct hyperplanes L_i ={l_i=0} in P^{n-1}, the n-1-dimensional projective space over an algebraically closed field of characteristic not equal to 2, is a polar simplex of a quadric Q={q=0}, if each L_i is the polar hyperplane of the point p_i, the intersection point of the L_j with j different from i, equivalently, if q= l_1^2+...+l_n^2 for suitable choices of the linear forms l_i. In this paper we study the closure VPS(Q,n) in Hilb_n(P^{n-1}) of the variety of sums of...
Source: http://arxiv.org/abs/1104.2728v2
We use the resolution of singularities algorithm of [G4] to provide new estimates for exponential sums as well as new bounds on how often a function f(x) such as a polynomial with integer coefficients is divisible by various powers of a prime p when x is an integer. They are proved using p-adic analogues of the theorems of [G3] on R^n sublevel set volumes and oscillatory integrals with real phase function. The proofs of these analogues use aspects of the resolution of singularities algorithms...
Source: http://arxiv.org/abs/1104.4684v4
Arxiv.org
texts

eye 43

favorite 0

comment 0

The Primitive Equations are a basic model in the study of large scale Oceanic and Atmospheric dynamics. These systems form the analytical core of the most advanced General Circulation Models. For this reason and due to their challenging nonlinear and anisotropic structure the Primitive Equations have recently received considerable attention from the mathematical community. In view of the complex multi-scale nature of the earth's climate system, many uncertainties appear that should be accounted...
Source: http://arxiv.org/abs/1104.4754v2
Arxiv.org
texts

eye 81

favorite 0

comment 0

Symmetry plays a central role in many areas of modern physics. Here we show that it also underpins the dual particle and wave nature of quantum systems. We begin by noting that a classical point particle breaks translational symmetry whereas a wave with uniform amplitude does not. This provides a basis for associating particle nature with asymmetry and wave nature with symmetry. We derive expressions for the maximum amount of classical information we can have about the symmetry and asymmetry of...
Source: http://arxiv.org/abs/1105.0083v2
Arxiv.org
by N. Crampe; E. Ragoucy
texts

eye 98

favorite 0

comment 0

We compute the spectrum and the eigenstates of the open XXX model with non-diagonal (triangular) boundary matrices. Since the boundary matrices are not diagonal, the usual coordinate Bethe ansatz does not work anymore, and we use a generalization of it to solve the problem.
Source: http://arxiv.org/abs/1105.0338v2
Arxiv.org
by Hideki Omori; Yoshiaki Maeda; Naoya Miyazaki; Akira Yoshioka
texts

eye 79

favorite 0

comment 0

This is a noncommutative version of the previous work entitled "Deformation Expression for Elements of Algebras (I)." In general in a noncommutative algebra, there is no canonical way to express elements in univalent way, which is often called "ordering problem". In this note we discuss this problem in the case of the Weyl algebra of 2m-generators. By fixing an expression, we extends Weyl algebra transcendentally. We treat *-exponential functions of linear forms, and...
Source: http://arxiv.org/abs/1105.1218v2
Arxiv.org
by Bin Liu; Jun-Li Li; Xikun Li; Cong-Feng Qiao
texts

eye 204

favorite 0

comment 0

We propose a practical entanglement classification scheme for general multipartite pure states in arbitrary dimensions under local unitary equivalence by exploiting the high order singular value decomposition technique and local symmetries of the states. By virtue of this scheme, the method of determining the local unitary equivalence of $n$-qubit states proposed by Kraus is extended to the case for arbitrary dimensional multipartite states.
Source: http://arxiv.org/abs/1105.1517v2
Arxiv.org
texts

eye 54

favorite 0

comment 0

For quantum information processing, each physical system has different advantage for the implementation and so hybrid systems to benefit from several systems would be able to provide a promising approach. One of the common hybrid approach is to combine a superconducting qubit as a controllable qubit and the other quantum system with a long coherence time as a memory qubit. The superconducting qubit allows us to have an excellent controllability of the quantum states and the memory qubit is...
Source: http://arxiv.org/abs/1105.3798v2
Arxiv.org
texts

eye 50

favorite 0

comment 0

In this note, we prove that, for a finite-dimensional Lie algebra $\mathfrak g$ over a field $\mathbb K$ of characteristic 0 which contains $\mathbb C$, the Chevalley--Eilenberg complex $\mathrm U(\mathfrak g)\otimes \wedge(\mathfrak g)$, which is in a natural way a deformation quantization of the Koszul complex of $\mathrm S(\mathfrak g)$, is $A_\infty$-quasi-isomorphic to the deformation quantization of the $A_\infty$-bimodule $K=\mathbb K$ provided by the Formality Theorem in presence of two...
Source: http://arxiv.org/abs/1105.5972v2
Arxiv.org
texts

eye 47

favorite 0

comment 0

We investigate the hydrodynamic limit for weakly asymmetric simple exclusion processes in crystal lattices. We construct a suitable scaling limit by using a discrete harmonic map. As we shall observe, the quasi-linear parabolic equation in the limit is defined on a flat torus and depends on both the local structure of the crystal lattice and the discrete harmonic map. We formulate the local ergodic theorem on the crystal lattice by introducing the notion of local function bundle, which is a...
Source: http://arxiv.org/abs/1105.6220v2
Arxiv.org
by Alberto Chamorro
texts

eye 52

favorite 0

comment 0

We present a definite formulation of the Principle of General Covariance (GCP) as a Principle of General Relativity with physical content and thus susceptible of verification or contradiction. To that end it is useful to introduce a kind of coordinates, that we call quasi-Minkowskian coordinates (QMC), as an empirical extension of the Minkowskian coordinates employed by the inertial observers in flat space-time to general observers in the curved situations in presence of gravitation. The QMC...
Source: http://arxiv.org/abs/1106.0394v2
Arxiv.org
texts

eye 98

favorite 0

comment 0

We study the market selection hypothesis in complete financial markets, populated by heterogeneous agents. We allow for a rich structure of heterogeneity: individuals may differ in their beliefs concerning the economy, information and learning mechanism, risk aversion, impatience and 'catching up with Joneses' preferences. We develop new techniques for studying the long-run behavior of such economies, based on the Strassen's functional law of iterated logarithm. In particular, we explicitly...
Source: http://arxiv.org/abs/1106.3025v3
Arxiv.org
by Zoran Petric
texts

eye 74

favorite 0

comment 0

A family of polytopes introduced by E.M. Feichtner, A. Postnikov and B. Sturmfels, which were named nestohedra, consists in each dimension of an interval of polytopes starting with a simplex and ending with a permutohedron. This paper investigates a problem of changing and extending the boundaries of these intervals. An iterative application of Feichtner-Kozlov procedure of forming complexes of nested sets is a solution of this problem. By using a simple algebraic presentation of members of...
Source: http://arxiv.org/abs/1106.3250v6
Arxiv.org
texts

eye 48

favorite 0

comment 0

In this note, an important extension to the recent construction of the fluxtrap background is presented. The fluxtrap is a closed string background based on the Melvin solution corresponding to the Omega deformation of flat space. In this note, we introduce the mechanisms to extend it from epsilon_1=-epsilon_2 in R to more general values of epsilon_1 and epsilon_2 in C.
Source: http://arxiv.org/abs/1108.0644v2
Arxiv.org
by Jonathan Chaika; Yitwah Cheung; Howard Masur
texts

eye 39

favorite 0

comment 0

We prove that the set of bounded geodesics in Teichmuller space are a winning set for Schmidt's game. This is a notion of largeness in a metric space that can apply to measure 0 and meager sets. We prove analogous closely related results on any Riemann surface, in any stratum of quadratic differentials, on any Teichmuller disc and for intervals exchanges with any fixed irreducible permutation.
Source: http://arxiv.org/abs/1109.5976v2
We show that there is no superradiance in the rotating BTZ black hole for vanishing boundary conditions at infinity for the real scalar field
Source: http://arxiv.org/abs/1110.2555v2
Arxiv.org
texts

eye 62

favorite 0

comment 0

The paper studies the rate of convergence of the weak Euler approximation for solutions to possibly completely degenerate SDEs driven by Levy processes, with Hoelder-continuous coefficients. It investigates the dependence of the rate on the regularity of coefficients and driving processes. In addition, the rate robustness to the approximation of the increments of the driving process is studied and approximate Euler scheme considered. A rate of convergence is derived for an approximate...
Source: http://arxiv.org/abs/1110.2473v5
Arxiv.org
by Anna Tuhola-Kujanpää; Harri Varpanen
texts

eye 49

favorite 0

comment 0

We introduce a definition for the $p$-Laplace operator on positive and finite Borel measures that satisfy an Adams-type embedding condition.
Source: http://arxiv.org/abs/1110.2749v2
Arxiv.org
by Andrea Piccolroaz; Gennady Mishuris
texts

eye 42

favorite 0

comment 0

The paper is concerned with the problem of a semi-infinite crack at the interface between two dissimilar elastic half-spaces, loaded by a general asymmetrical system of forces distributed along the crack faces. On the basis of the weight function approach and the fundamental reciprocal identity (Betti formula), we formulate the elasticity problem in terms of singular integral equations relating the applied loading and the resulting crack opening. Such formulation is fundamental in the theory of...
Source: http://arxiv.org/abs/1110.3612v3
Arxiv.org
by Yoichi Kazama; Shota Komatsu
texts

eye 61

favorite 0

comment 0

Adapting the powerful integrability-based formalism invented previously for the calculation of gluon scattering amplitudes at strong coupling, we develop a method for computing the holographic three point functions for the large spin limit of Gubser-Klebanov- Polyakov (GKP) strings. Although many of the ideas from the gluon scattering problem can be transplanted with minor modifications, the fact that the information of the external states is now encoded in the singularities at the vertex...
Source: http://arxiv.org/abs/1110.3949v3
Arxiv.org
texts

eye 76

favorite 0

comment 0

I discuss a correspondence between string theory and the black hole membrane paradigm in the context of the D1-D5-P system. By using the Kubo formula, I calculate transport coefficients of the effective string model induced by two kinds of minimal scalars. Then, I show that these transport coefficients exactly agree with the corresponding membrane transport coefficients of a five-dimensional near-extremal black hole with three charges.
Source: http://arxiv.org/abs/1110.4277v2
Arxiv.org
by Micka ël D. Chekroun; Nathan E. Glatt-Holtz
texts

eye 77

favorite 0

comment 0

In this work we study certain invariant measures that can be associated to the time averaged observation of a broad class of dissipative semigroups via the notion of a generalized Banach limit. Consider an arbitrary complete separable metric space $X$ which is acted on by any continuous semigroup $\{S(t)\}_{t \geq 0}$. Suppose that $\S(t)\}_{t \geq 0}$ possesses a global attractor $\mathcal{A}$. We show that, for any generalized Banach limit $\underset{T \rightarrow \infty}{\rm{LIM}}$ and any...
Source: http://arxiv.org/abs/1110.4354v3
Arxiv.org
texts

eye 108

favorite 0

comment 0

The symplectic blob algebras are a family of finite dimensional noncommutative algebras over $\mathbb{Z}[X_1,X_2,X_3,X_4,X_5,X_6]$ that can be defined in terms of planar diagrams in a way that extends the Temperley-Lieb and (ordinary) blob algebras. In this paper we construct a new "tensor space" representation of the symplectic blob algebra $\mathcal{A} \otimes \sba$ for each $n \in \mathbb{N}$, for $\mathcal{A}$ a particular commutative ring with indeterminates. The form of this...
Source: http://arxiv.org/abs/1111.0145v2
Arxiv.org
by Michael J. W. Hall; Dominic W. Berry; Marcin Zwierz; Howard M. Wiseman
texts

eye 43

favorite 0

comment 0

The Heisenberg limit traditionally provides a lower bound on the phase uncertainty scaling as 1/, where is the mean number of photons in the probe. However, this limit has a number of loopholes which potentially might be exploited, to achieve measurements with even greater accuracy. Here we close these loopholes by proving a completely rigorous form of the Heisenberg limit for the average error over all phase shifts. Our result gives the first completely general, constraint-free and...
Source: http://arxiv.org/abs/1111.0788v3
Arxiv.org
by L. F. Lopes Oliveira; R. Rossi Jr; A. R. Bosco de Magalhaes; J. G. Peixoto de Faria; M. C. Nemes
texts

eye 42

favorite 0

comment 0

We illustrate the equivalence between the non-unitary evolution of an open quantum system governed by a Markovian master equation and a process of continuous measurements involving this system. We investigate a system of two coupled modes, only one of them interacting with external degrees of freedom, represented, in the first case, by a finite number of harmonic oscillators, and, in the second, by a sequence of atoms where each one interacts with a single mode during a limited time. Two...
Source: http://arxiv.org/abs/1111.1105v2
Arxiv.org
by Andreas Hula
texts

eye 56

favorite 1

comment 0

With negative growth in real production in many countries and debt levels which become an increasing burden on developed societies, the calls for a change in economic policy and even the monetary system become louder and increasingly impatient. We research the consequences of a system of credit and debt, that still allows for the expansion of credit and fundamentally retains many features of the present monetary system, without the instability inherent in the present system.
Source: http://arxiv.org/abs/1111.3035v4
Arxiv.org
by Daniel Szomoru; Marijn Franx; Pieter G. van Dokkum
texts

eye 51

favorite 0

comment 0

We use deep Hubble Space Telescope Wide Field Camera 3 near-infrared imaging obtained of the GOODS-South field as part of the CANDELS survey to investigate a stellar mass-limited sample of quiescent galaxies at 1.5 < z < 2.5. We measure surface brightness profiles for these galaxies using a method that properly measures low surface brightness flux at large radii. We find that quiescent galaxies at z ~ 2 very closely follow Sersic profiles, with n_{median} = 3.7, and have no excess flux at...
Source: http://arxiv.org/abs/1111.3361v4
Arxiv.org
by Alexander C. Edison; Stephen G. Naculich
texts

eye 108

favorite 0

comment 0

Color-ordered amplitudes for the scattering of n particles in the adjoint representation of SU(N) gauge theory satisfy constraints arising solely from group theory. We derive these constraints for n=5 at all loop orders using an iterative approach. These constraints generalize well-known tree-level and one-loop group theory relations.
Source: http://arxiv.org/abs/1111.3821v2
Arxiv.org
texts

eye 50

favorite 0

comment 0

We prove an exact trace formula for the Laplacian with a delta potential - also known as a point scatterer - on a non-compact hyperbolic surface of finite volume with one cusp. Our formula is an analogue of the Selberg trace formula. We express the difference of perturbed and unperturbed trace as a smooth term plus a sum over combinations of diffractive orbits.
Source: http://arxiv.org/abs/1111.6198v2
The formulation of the Lifshitz formula in terms of real frequencies is reconsidered for half spaces described by the plasma model. It is shown that besides the surface modes (for the TM polarization), and the photonic modes, also waveguide modes must be considered.
Source: http://arxiv.org/abs/1111.6356v3
Arxiv.org
texts

eye 95

favorite 0

comment 0

Partition functions of N=2 theories on the squashed 3-sphere have been recently shown to localise to matrix integrals. By explicitly evaluating the matrix integral we show that abelian partition functions can be expressed as a sum of products of two blocks. We identify the first block with the partition function of the vortex theory, with equivariant parameter hbar=2 Pi i b^2, defined on R^2 x S_1 corresponding to the b->0 degeneration of the ellipsoid. The second block gives the partition...
Source: http://arxiv.org/abs/1111.6905v2
Arxiv.org
by Guido De Philippis; Alessio Figalli
texts

eye 65

favorite 0

comment 0

In this paper we prove that a strictly convex Alexandrov solution u of the Monge-Amp\`ere equation, with right hand side bounded away from zero and infinity, is $W_{\rm loc}^{2,1}$. This is obtained by showing higher integrability a-priori estimates for $D^2 u$, namely $D^2 u \in L\log^k L$ for any $k\in \mathbb N$.
Source: http://arxiv.org/abs/1111.7207v2
Arxiv.org
by A. Mokashi; S. Li; Bo Wen; S. V. Kravchenko; A. A. Shashkin; V. T. Dolgopolov; M. P. Sarachik
texts

eye 41

favorite 0

comment 0

With decreasing density $n_s$ the thermopower $S$ of a low-disorder 2D electron system in silicon is found to exhibit a sharp increase by more than an order of magnitude, tending to a divergence at a finite, disorder-independent density $n_t$ consistent with the critical form $(-T/S) \propto (n_s-n_t)^x$ with $x=1.0\pm 0.1$ ($T$ is the temperature). Our results provide clear evidence for an interaction-induced transition to a new phase at low density in a strongly-interacting 2D electron system.
Source: http://arxiv.org/abs/1111.7238v2
Arxiv.org
by S. Habib Mazharimousavi; I. Sakalli; M. Halilsoy
texts

eye 34

favorite 0

comment 0

We show in detail that the Hawking temperature calculated from the surface gravity is in agreement with the result of exact semi-classical radiation spectrum for higher dimensional linear dilaton black holes in various theories. We extend the method derived first by Cl\'ement-Fabris-Marques for 4-dimensional linear dilaton black hole solutions to the higher dimensions in theories such as Einstein-Maxwell-Dilaton, Einstein-Yang-Mills-Dilaton and Einstein-Yang-Mills-Born-Infeld-Dilaton. Similar...
Source: http://arxiv.org/abs/0902.0666v3
Arxiv.org
by K. Dosen; Z. Petric
texts

eye 44

favorite 0

comment 0

A split preorder is a preordering relation on the disjoint union of two sets, which function as source and target when one composes split preorders. The paper presents by generators and equations the category SplPre, whose arrows are the split preorders on the disjoint union of two finite ordinals. The same is done for the subcategory Gen of SplPre, whose arrows are equivalence relations, and for the category Rel, whose arrows are the binary relations between finite ordinals, and which has an...
Source: http://arxiv.org/abs/0902.0742v7
Arxiv.org
texts

eye 42

favorite 0

comment 0

We continue the study of the Hrushovski-Kazhdan integration theory and consider exponential integrals. The Grothendieck ring is enlarged via a tautological additive character and hence can receive such integrals. We then define the Fourier transform in our integration theory and establish some fundamental properties of it. Thereafter a basic theory of distributions is also developed. We construct the Weil representations in the end as an application. The results are completely parallel to the...
Source: http://arxiv.org/abs/0903.1097v2
Arxiv.org
texts

eye 109

favorite 0

comment 0

The helicity of a vector field is a measure of the average linking of pairs of integral curves of the field. Computed by a six-dimensional integral, it is widely useful in the physics of fluids. For a divergence-free field tangent to the boundary of a domain in 3-space, helicity is known to be invariant under volume-preserving diffeomorphisms of the domain that are homotopic to the identity. We give a new construction of helicity for closed $(k+1)$-forms on a domain in $(2k+1)$-space that...
Source: http://arxiv.org/abs/0903.1465v3
Arxiv.org
texts

eye 29

favorite 0

comment 0

We exactly solve Dyson-Schwinger equations for a massless quartic scalar field theory. n-point functions are computed till n=4 and the exact propagator computed from the two-point function. The spectrum is so obtained, being the same of a harmonic oscillator. Callan-Symanzik equation for the two-point function gives the beta function. This gives the result that this theory has only trivial fixed points. In the low-energy limit the coupling goes to zero making the theory trivial and, at high...
Source: http://arxiv.org/abs/0909.2428v3
Arxiv.org
by D. Campagnari; A. Weber; H. Reinhardt; F. Astorga; W. Schleifenbaum
texts

eye 43

favorite 0

comment 0

We apply a functional perturbative approach to the calculation of the equal-time two-point correlation functions and the potential between static color charges to one-loop order in Coulomb gauge Yang-Mills theory. The functional approach proceeds through a solution of the Schroedinger equation for the vacuum wave functional to order g^2 and derives the equal-time correlation functions from a functional integral representation via new diagrammatic rules. We show that the results coincide with...
Source: http://arxiv.org/abs/0910.4548v2
Arxiv.org
by Francesco G. Russo
texts

eye 114

favorite 0

comment 0

The structure of a group which is not nilpotent but all of whose proper subgroups are nilpotent has interested the researches of several authors both in the finite case and in the infinite case. The present paper generalizes some classic descriptions of M. Newman, H. Smith and J. Wiegold in the context of supersolvable groups.
Source: http://arxiv.org/abs/0912.0667v3
Arxiv.org
by Arnak S. Dalalyan; Alexandre B. Tsybakov
texts

eye 39

favorite 0

comment 0

We consider the problem of aggregating the elements of a possibly infinite dictionary for building a decision procedure that aims at minimizing a given criterion. Along with the dictionary, an independent identically distributed training sample is available, on which the performance of a given procedure can be tested. In a fairly general set-up, we establish an oracle inequality for the Mirror Averaging aggregate with any prior distribution. By choosing an appropriate prior, we apply this...
Source: http://arxiv.org/abs/1003.1189v4
Arxiv.org
by Scott M. Bailey
texts

eye 43

favorite 0

comment 0

Computations involving the so-called root invariant prompted Mahowald and Shick to develop the slogan: "the root invariant of v_n-periodic homotopy is v_n-torsion." While neither a proof, nor a precise statement, of this slogan appears in the literature numerous authors have offered computational evidence lending further credence toward its truth. The root invariant is closely related to Mahowald's inverse limit construction of the Tate spectrum. Computations have shown the Tate...
Source: http://arxiv.org/abs/0904.3687v2
Arxiv.org
by Pierre Tarrès; Pierre Vandekerkhove
texts

eye 93

favorite 0

comment 0

A device has two arms with unknown deterministic payoffs and the aim is to asymptotically identify the best one without spending too much time on the other. The Narendra algorithm offers a stochastic procedure to this end. We show under weak ergodic assumptions on these deterministic payoffs that the procedure eventually chooses the best arm (i.e., with greatest Cesaro limit) with probability one for appropriate step sequences of the algorithm. In the case of i.i.d. payoffs, this implies a...
Source: http://arxiv.org/abs/0905.0463v2
Arxiv.org
texts

eye 40

favorite 0

comment 0

We report conditions on a switching signal that guarantee that solutions of a switched linear systems converge asymptotically to zero. These conditions are apply to continuous, discrete-time and hybrid switched linear systems, both those having stable subsystems and mixtures of stable and unstable subsystems.
Source: http://arxiv.org/abs/0905.0650v2
Arxiv.org
by A. O. Barvinsky; A. Yu. Kamenshchik; C. Kiefer; A. A. Starobinsky; C. F. Steinwachs
texts

eye 56

favorite 0

comment 0

We consider the renormalization group improvement in the theory of the Standard Model (SM) Higgs boson playing the role of an inflaton with a strong non-minimal coupling to gravity. At the one-loop level with the running of constants taken into account, it leads to a range of the Higgs mass that is entirely determined by the lower WMAP bound on the cosmic microwave background (CMB) spectral index. We find that the SM phenomenology is sensitive to current cosmological data, which suggests to...
Source: http://arxiv.org/abs/0910.1041v3
Arxiv.org
texts

eye 39

favorite 0

comment 0

The Witten Laplacian in one dimension is studied further by methods of resurgent analysis in order to approach Fukaya's conjectures relating WKB asymptotics and disc instantons. In this paper more precise connection formulae are presented, which allows the calculation of a subdominant exponential term in the hyperasymptotic expansion of a low-lying eigenvalue. Calculation of eigenfunctions corresponding to low-lying eigenvalues is presented in two examples.
Source: http://arxiv.org/abs/1004.3110v2
Arxiv.org
texts

eye 47

favorite 0

comment 0

Lorentz transformation of three-qubit Greenberger-Horne-Zeilinger (GHZ) state is studied. Also we obtain the relativistic spin joint measurement for the transformed state. Using these results it is shown that Bell's inequality is maximally violated for three-qubit GHZ state in relativistic regime. For ultrarelativistic particles we obtain the critical value for boost speed which Bell's inequality is not violated for velocities smaller than this value. We also show that in ultrarelativistic...
Source: http://arxiv.org/abs/1201.0492v1
Arxiv.org
texts

eye 69

favorite 0

comment 0

An integrable field theory, due to path-independence on the space-time plane, should yield together with an infinite set of independent conserved charges also similar dual charges determining the boundary and defect contributions. On the example of the nonlinear Schroedinger equation we unravel hidden hierarchies and dual structures and show the complete integrability through a novel Yang-Baxter equation at the classical and quantum level with exact solution.
Source: http://arxiv.org/abs/1201.0627v3
Arxiv.org
by Asaf Eliam; Evgeny A. Shapiro; Moshe Shapiro
texts

eye 59

favorite 0

comment 0

We propose a method based on the Electromagnetically Induced Transparency (EIT) phenomenon for the detection of molecules which exist as a small minority in the presence of a majority of absorbers. The EIT effect we employ effectively eliminates the absorption of the majority species in the spectral region where it overlaps with the absorption of the minority species. The method can also be used to enhance local-modes transitions which overlap spectrally with a background of other local-modes...
Source: http://arxiv.org/abs/1201.0581v1
Arxiv.org
by Jackson Levi Said; Kristian Zarb Adami
texts

eye 43

favorite 0

comment 0

The formation of cosmological black holes is investigated using the functional Schroedinger equation as observed by an asymptotic observer, assuming a spherical domain wall collapse process. The mass formula of the Sultana-Dyer black hole is derived using Israel's domain wall mathematical framework. This is used to examine the semi-classical and quantum nature of the collapsing domain wall in the general scale of an arbitrary scale factor, while ignoring evaporation and back reaction mass...
Source: http://arxiv.org/abs/1201.0750v2
It is well known, that R-parity violating supersymmetric models predict a non-zero magnetic moment for neutrinos. In this work we study the Majorana neutrino transition magnetic moments within an RpV modified minimal supergravity model. Specifically, we discuss the contributions coming from the charged Higgs bosons, higgsinos, leptons, sleptons, charged gauge bosons, and charginos. We use the experimental results from the MUNU collaboration to restrict the model's parameter space. A comparison...
Source: http://arxiv.org/abs/1201.0873v1
Arxiv.org
by Boudewijn F. Roukema
texts

eye 68

favorite 0

comment 0

The role of global topology in the dynamics of the Universe is poorly understood. Along with observational programmes for determining the topology of the Universe, some small theoretical steps have recently been made. Heuristic Newtonian-like arguments suggest a topological acceleration effect that differs for differing spatial sections. A relativistic spacetime solution solution shows that the effect is not just a Newtonian artefact.
Source: http://arxiv.org/abs/1201.0971v1
Arxiv.org
by Patrick Richard; Sean Mcnamara; Merline Tankeo
texts

eye 42

favorite 0

comment 0

We have performed a simulation study of 3D cohesionless granular flows down an inclined chute. We find that the oscillations observed in [L.E. Silbert, Phys. Rev. Lett., 94, 098002 (2005)] near the angle of repose are harmonic vibrations of the lowest normal mode. Their frequencies depend on the contact stiffness as well as on the depth of the flow. Could these oscillations account for the phenomena of "booming sand"? We estimate an effective contact stiffness from the Hertz law, but...
Source: http://arxiv.org/abs/1201.0958v1
Arxiv.org
by Subhadeep Mondal; Sanjoy Biswas; Pradipta Ghosh; Sourov Roy
texts

eye 66

favorite 0

comment 0

We investigate signatures of the minimal supersymmetric inverse seesaw model at the large hadron collider (LHC) with three isolated leptons and large missing energy (3\ell + \mET or 2\ell + 1\tau + \mET, with \ell=e,\mu) in the final state. This signal has its origin in the decay of chargino-neutralino (\chpm1\ntrl2) pair, produced in pp collisions. The two body decays of the lighter chargino into a charged lepton and a singlet sneutrino has a characteristic decay pattern which is correlated...
Source: http://arxiv.org/abs/1201.1556v2
Arxiv.org
by Pietro Corvaja; Vijay Sookdeo; Thomas J. Tucker; Umberto Zannier
texts

eye 60

favorite 0

comment 0

Let K be a number field, let f: P_1 --> P_1 be a nonconstant rational map of degree greater than 1, let S be a finite set of places of K, and suppose that u, w in P_1(K) are not preperiodic under f. We prove that the set of (m,n) in N^2 such that f^m(u) is S-integral relative to f^n(w) is finite and effectively computable. This may be thought of as a two-parameter analog of a result of Silverman on integral points in orbits of rational maps. This issue can be translated in terms of integral...
Source: http://arxiv.org/abs/1201.1313v2
Arxiv.org
by Eric Berberich; Pavel Emeliyanenko; Alexander Kobel; Michael Sagraloff
texts

eye 105

favorite 0

comment 0

We present a novel certified and complete algorithm to compute arrangements of real planar algebraic curves. It provides a geometric-topological analysis of the decomposition of the plane induced by a finite number of algebraic curves in terms of a cylindrical algebraic decomposition. From a high-level perspective, the overall method splits into two main subroutines, namely an algorithm denoted Bisolve to isolate the real solutions of a zero-dimensional bivariate system, and an algorithm...
Source: http://arxiv.org/abs/1201.1548v1
Arxiv.org
texts

eye 39

favorite 0

comment 0

We consider gauge fixing of open superstring field theory formulated by Berkovits, concentrating on the Neveu-Schwarz sector. In the free theory, we perform gauge fixing completely, which requires infinitely many ghosts and antighosts carrying various world-sheet ghost numbers and picture numbers. In the interacting theory, we have determined the form of interactions cubic in fields and antifields in the Batalin-Vilkovisky formalism.
Source: http://arxiv.org/abs/1201.1763v1
Arxiv.org
by J. S. Zhang; C. Henkel; Q. Guo; J. Wang
texts

eye 91

favorite 0

comment 0

The 6 cm and 20 cm radio continuum properties of all 85 galaxies with reported 22 GHz H2O maser emission and luminosity distance D > 0.5 Mpc are studied. For the total of 55 targets for which both 6 cm and 20 cm measurements exist and for the subsample of 42 sources with masers related to active galactic nuclei (AGN), a spectral index could be determined from an assumed power-law dependence. The mean value of the resulting spectral index is in both cases 0.66+-0.07. Comparing radio...
Source: http://arxiv.org/abs/1201.2075v1
Arxiv.org
by P. E. Kloeden; V. S. Kozyakin
texts

eye 48

favorite 0

comment 0

Continuous-time discrete-state random Markov chains generated by a random linear differential equation with a random tridiagonal matrix are shown to have a random attractor consisting of singleton subsets, essentially a random path, in the simplex of probability vectors. The proof uses comparison theorems for Carath\'eodory random differential equations and the fact that the linear cocycle generated by the Markov chain is a uniformly contractive mapping of the positive cone into itself with...
Source: http://arxiv.org/abs/1201.1999v2
Arxiv.org
by Marco Frittelli; Marco Maggis; Ilaria Peri
texts

eye 42

favorite 0

comment 0

We propose a generalization of the classical notion of the $V@R_{\lambda}$ that takes into account not only the probability of the losses, but the balance between such probability and the amount of the loss. This is obtained by defining a new class of law invariant risk measures based on an appropriate family of acceptance sets. The $V@R_{\lambda}$ and other known law invariant risk measures turn out to be special cases of our proposal. We further prove the dual representation of Risk Measures...
Source: http://arxiv.org/abs/1201.2257v4
Arxiv.org
texts

eye 45

favorite 0

comment 0

Examples of normalizable zero modes of the Faddeev-Popov operator in SU(2) Euclidean Yang-Mills theories in the Landau gauge are constructed in d=2,3,4 dimensions.
Source: http://arxiv.org/abs/1201.2445v2
Arxiv.org
texts

eye 40

favorite 0

comment 0

In this paper we explore the effect of decaying dark matter (DDM) on large-scale structure and possible constraints from galaxy imaging surveys. DDM models have been studied, in part, as a way to address apparent discrepancies between the predictions of standard cold dark matter models and observations of galactic structure. Our study is aimed at developing independent constraints on these models. In such models, DDM decays into a less massive, stable dark matter (SDM) particle and a...
Source: http://arxiv.org/abs/1201.2426v1
Arxiv.org
texts

eye 75

favorite 0

comment 0

We present the first results from our high-precision infrared (IR) astrometry program at the Canada-France-Hawaii Telescope. We measure parallaxes for 83 ultracool dwarfs (spectral types M6--T9) in 49 systems, with a median uncertainty of 1.1 mas (2.3%) and as good as 0.7 mas (0.8%). We provide the first parallaxes for 48 objects in 29 systems, and for another 27 objects in 17 systems, we significantly improve upon published results, with a median (best) improvement of 1.7x (5x). Three systems...
Source: http://arxiv.org/abs/1201.2465v2
Arxiv.org
by S. McDaniel; A. Gade; J. A. Tostevin; T. Baugher; D. Bazin; B. A. Brown; J. M. Cook; T. Glasmacher; G. F. Grinyer; A. Ratkiewicz; D. Weisshaar
texts

eye 61

favorite 0

comment 0

Background: Thick-target-induced nucleon-adding transfer reactions onto energetic rare-isotope beams are an emerging spectroscopic tool. Their sensitivity to single-particle structure complements one-nucleon removal reaction capabilities in the quest to reveal the evolution of nuclear shell structure in very exotic nuclei. Purpose: To add intermediate-energy, carbon-target-induced one-proton pickup reactions to the arsenal of $\gamma$-ray tagged direct reactions applicable in the regime of low...
Source: http://arxiv.org/abs/1201.2403v2
Arxiv.org
by Jérôme Margueron; N. Sandulescu
texts

eye 43

favorite 0

comment 0

In this review paper we discuss the effects of pairing correlations on inner crust matter in the density region where nuclear clusters are supposed to coexist with nonlocalised neutrons. The pairing correlations are treated in the framework of the finite temperature Hartree-Fock-Bogoliubov approach and using zero range nuclear forces. After a short introduction and presentation of the formalism we discuss how the pairing correlations affect the structure of the inner crust matter, i.e., the...
Source: http://arxiv.org/abs/1201.2774v1
Arxiv.org
by Spyros Sioutas; Peter Triantafillou; George Papaloukopoulos; Evangelos Sakkopoulos; Kostas Tsichlas; Yannis Manolopoulos
texts

eye 46

favorite 0

comment 0

We focus on range query processing on large-scale, typically distributed infrastructures, such as clouds of thousands of nodes of shared-datacenters, of p2p distributed overlays, etc. In such distributed environments, efficient range query processing is the key for managing the distributed data sets per se, and for monitoring the infrastructure's resources. We wish to develop an architecture that can support range queries in such large-scale decentralized environments and can scale in terms of...
Source: http://arxiv.org/abs/1201.2766v1
Arxiv.org
by Wael Jaafar; Wessam Ajib; David Haccoun
texts

eye 47

favorite 0

comment 0

Combining cognitive radio technology with user cooperation could be advantageous to both primary and secondary transmissions. In this paper, we propose a first relaying scheme for cognitive radio networks (called "Adaptive relaying scheme 1"), where one relay node can assist the primary or the secondary transmission with the objective of improving the outage probability of the secondary transmission with respect to a primary outage probability threshold. Upper bound expressions of the...
Source: http://arxiv.org/abs/1201.2937v1
Arxiv.org
by Ghazi Al-Naymat; Sanjay Chawla; Javid Taheri
texts

eye 54

favorite 0

comment 0

We present a new space-efficient approach, (SparseDTW), to compute the Dynamic Time Warping (DTW) distance between two time series that always yields the optimal result. This is in contrast to other known approaches which typically sacrifice optimality to attain space efficiency. The main idea behind our approach is to dynamically exploit the existence of similarity and/or correlation between the time series. The more the similarity between the time series the less space required to compute the...
Source: http://arxiv.org/abs/1201.2969v1
Arxiv.org
by Howard Baer; Vernon Barger; Andre Lessa; Warintorn Sreethawong; Xerxes Tata
texts

eye 52

favorite 0

comment 0

In SUSY models with heavy squarks and gaugino mass unification, the gaugino pair production reaction pp-> \tw_1^\pm\tz_2 dominates gluino pair production for m_{\tg}\agt 1 TeV at LHC with \sqrt{s}=14 TeV (LHC14). For this mass range, the two-body decays \tw_1\to W\tz_1 and \tz_2\to h\tz_1 are expected to dominate the chargino and neutralino branching fractions. By searching for \ell b\bar{b}+MET events from \tw_1^\pm\tz_2 production, we show that LHC14 with 100 fb^{-1} of integrated...
Source: http://arxiv.org/abs/1201.2949v1
Arxiv.org
by Daniel Coumbe; Jack Laiho
texts

eye 42

favorite 0

comment 0

We present evidence that a nonperturbative model of quantum gravity defined via Euclidean dynamical triangulations contains a region in parameter space with an extended 4-dimensional geometry when a non-trivial measure term is included in the gravitational path integral. Within our extended region we find a large scale spectral dimension of D_s = 4.04 +/- 0.26 and a Hausdorff dimension that is consistent with D_H = 4 from finite size scaling. We find that the short distance spectral dimension...
Source: http://arxiv.org/abs/1201.2864v2
Arxiv.org
by ShiAnne Kattner; Douglas C. Leonard; Christopher R. Burns; M. M. Phillips; Gaston Folatelli; Nidia Morrell; Maximilian D. Stritzinger; Mario Hamuy; Wendy L. Freedman; Sven E. Persson; Miguel Roth; Nicholas B. Suntzeff
texts

eye 56

favorite 0

comment 0

We analyze the standardizability of Type Ia supernovae (SNe Ia) in the near-infrared (NIR) by investigating the correlation between observed peak NIR absolute magnitude and post-maximum B-band decline rate. A sample of 27 low-redshift SNe Ia observed by the Carnegie Supernova Project between 2004 to 2007 is used. All 27 objects have pre-maximum coverage in optical bands, with a subset of 13 having pre-maximum NIR observations as well. We describe the methods used to derive absolute peak...
Source: http://arxiv.org/abs/1201.2913v2
Arxiv.org
texts

eye 46

favorite 0

comment 0

The data of velocity rotation curve in spiral galaxies, almost for galaxies which have close central surface brightness, collapse onto a universal scaling function. Since scaling functions are the signature of emergence in complex systems we are led to the idea that explanation of constant velocity in spiral galaxies needs considering cooperative behavior instead of interpretation based on reductionism approach.
Source: http://arxiv.org/abs/1201.2994v1
Arxiv.org
by Emanuele Pedersoli; Francesco Banfi; Barbara Ressel; Stefania Pagliara; Claudio Giannetti; Gianluca Galimberti; Steve Lidia; John Corlett; Gabriele Ferrini; Fulvio Parmigiani
texts

eye 53

favorite 0

comment 0

Quantum Efficiency (QE) measurements of single photon photoemission from a Cu(111) single crystal and a Cu polycrystal photocathodes, irradiated by 150 fs-6.28 eV laser pulses, are reported over a broad range of incidence angle, both in s and p polarizations. The maximum QE (\simeq 4\times10^{-4}) for polycrystalline Cu is obtained in p polarization at an angle of incidence {\theta} = 65deg. We observe a QE enhancement in p polarization which can not be explained in terms of optical absorption,...
Source: http://arxiv.org/abs/1201.3046v1
Arxiv.org
texts

eye 44

favorite 0

comment 0

The observed density of dark matter is of the magnitude expected for a thermal relic weakly-interacting massive particle (WIMP). In addition, the observed baryon density is within an order of magnitude of the dark matter density. This suggests that the baryon density is physically related to a typical thermal relic WIMP dark matter density. We present a model which simultaneously generates thermal relic WIMP-like densities for both baryons and dark matter by modifying a large initial baryon...
Source: http://arxiv.org/abs/1201.3124v1
Arxiv.org
texts

eye 77

favorite 0

comment 0

We show that the magneto-electric coupling in 3D (strong) topological insulators is related to a second derivative of the bulk magnetization. The formula we derive is the non-linear response analog of the Streda formula for Hall conductivity (P. Streda, J. Phys. C: Solid State Physics, 15, 22 (1982)), which relates the Hall conductivity to the derivative of the magnetization with respect to chemical potential. Our finding allows one to extract the magneto-electric coefficient by measuring the...
Source: http://arxiv.org/abs/1201.3042v2