Skip to main content
Internet Archive's 25th Anniversary Logo

4,276
UPLOADS


More right-solid

Show sorted alphabetically

More right-solid

Show sorted alphabetically

More right-solid

More right-solid
SHOW DETAILS
eye
Title
Date Archived
Creator
Arxiv.org
by Hiroshi Miki; Satoshi Tsujimoto; Luc Vinet; Alexei Zhedanov
texts

eye 123

favorite 0

comment 0

An interpretation of the multiple Meixner polynomials of the first kind is provided through an infinite Lie algebra realized in terms of the creation and annihilation operators of a set of independent oscillators. The model is used to derive properties of these orthogonal polynomials.
Source: http://arxiv.org/abs/1203.0357v1
Arxiv.org
by Takeshi Araki; Julian Heeck; Jisuke Kubo
texts

eye 35

favorite 0

comment 0

Augmenting the Standard Model by three right-handed neutrinos allows for an anomaly-free gauge group extension G_max = U(1)_(B-L) x U(1)_(L_e-L_mu) x U(1)_(L_mu-L_tau). While simple U(1) subgroups of G_max have already been discussed in the context of approximate flavor symmetries, we show how two-zero textures in the right-handed neutrino Majorana mass matrix can be enforced by the flavor symmetry, which is spontaneously broken very economically by singlet scalars. These zeros lead to two...
Source: http://arxiv.org/abs/1203.4951v2
Arxiv.org
texts

eye 59

favorite 0

comment 0

We consider the effect of the wind and the dissipation on the nonlinear stages of the modulational instability. By applying a suitable transformation, we map the forced/damped Nonlinear Schr\"odinger (NLS) equation into the standard NLS with constant coefficients. The transformation is valid as long as |{\Gamma}t| \ll 1, with {\Gamma} the growth/damping rate of the waves due to the wind/dissipation. Approximate rogue wave solutions of the equation are presented and discussed. The results...
Source: http://arxiv.org/abs/1203.4735v1
Arxiv.org
by Octavio Miramontes; Og DeSouza; Diego Hernández; Eliane Ceccon
texts

eye 53

favorite 0

comment 0

We measured mobility patterns that describe walking trajectories of individual Me'Phaa peasants searching and collecting fuelwood in the forests of "La Monta\~na de Guerrero" in Mexico. These one-day excursions typically follow a mixed pattern of nearly-constant steps when individuals displace from their homes towards potential collecting sites and a mixed pattern of steps of different lengths when actually searching for fallen wood in the forest. Displacements in the searching phase...
Source: http://arxiv.org/abs/1203.0971v1
Arxiv.org
texts

eye 77

favorite 0

comment 0

In complex systems, the interplay between nonlinear and stochastic dynamics, e.g., J. Monod's necessity and chance, gives rise to an evolutionary process in Darwinian sense, in terms of discrete jumps among attractors, with punctuated equilibrium, spontaneous random "mutations" and "adaptations". On an evlutionary time scale it produces sustainable diversity among individuals in a homogeneous population rather than convergence as usually predicted by a deterministic...
Source: http://arxiv.org/abs/1203.3554v2
Arxiv.org
by Ismael Fortuna; Gilberto L. Thomas; Rita M. C. de Almeida; Francois Graner
texts

eye 76

favorite 0

comment 0

We study the topology and geometry of two dimensional coarsening foams with arbitrary liquid fraction. To interpolate between the dry limit described by von Neumann's law, and the wet limit described by Marqusee equation, the relevant bubble characteristics are the Plateau border radius and a new variable, the e?ective number of sides. We propose an equation for the individual bubble growth rate as the weighted sum of the growth through bubble-bubble interfaces and through bubble-Plateau...
Source: http://arxiv.org/abs/1203.5834v2
Arxiv.org
by Kristoffer Arnsfelt Hansen; Rasmus Ibsen-Jensen; Peter Bro Miltersen
texts

eye 45

favorite 0

comment 0

Two standard algorithms for approximately solving two-player zero-sum concurrent reachability games are value iteration and strategy iteration. We prove upper and lower bounds of 2^(m^(Theta(N))) on the worst case number of iterations needed by both of these algorithms for providing non-trivial approximations to the value of a game with N non-terminal positions and m actions for each player in each position. In particular, both algorithms have doubly-exponential complexity. Even when the game...
Source: http://arxiv.org/abs/1007.1812v3
Arxiv.org
texts

eye 55

favorite 0

comment 0

In this paper, we shall establish a Dancer-type unilateral global bifurcation result for a class of quasilinear elliptic problems with sign-changing weight. Under some natural hypotheses on perturbation function, we show that $(\mu_k^\nu(p),0)$ is a bifurcation point of the above problems and there are two distinct unbounded continua, $(\mathcal{C}_{k}^\nu)^+$ and $(\mathcal{C}_{k}^\nu)^-$, consisting of the bifurcation branch $\mathcal{C}_{k}^\nu$ from $(\mu_k^\nu(p), 0)$, where $\mu_k^\nu(p)$...
Source: http://arxiv.org/abs/1203.3262v1
Arxiv.org
texts

eye 38

favorite 0

comment 0

We consider the synthesis of control policies for probabilistic systems, modeled by Markov decision processes, operating in partially known environments with temporal logic specifications. The environment is modeled by a set of Markov chains. Each Markov chain describes the behavior of the environment in each mode. The mode of the environment, however, is not known to the system. Two control objectives are considered: maximizing the expected probability and maximizing the worst-case probability...
Source: http://arxiv.org/abs/1203.1177v1
Arxiv.org
texts

eye 43

favorite 0

comment 0

We analyze event-by-event fluctuations of the transverse momentum in relativistic heavy-ion collisions at RHIC in the framework based on the fluctuating Glauber-model initial conditions, event-by-event (3+1)-dimensional viscous hydrodynamics, and statistical hadronization. We use the scaled fluctuation measure < Delta p_Ti Delta p_Tj > / < < p_T >>. The identified "geometric" mechanism of generating the transverse-momentum fluctuations from the initial size...
Source: http://arxiv.org/abs/1203.1810v1
Arxiv.org
texts

eye 70

favorite 0

comment 0

We consider the differential cross section of electron-positron pair production by a high-energy photon in a strong Coulomb field close to the end of the electron or positron spectrum. When the momentum transfer largely exceeds the electron mass, the cross section is obtained analytically in a compact form. Coulomb corrections essentially modify the cross section even for moderate values of the nuclear charge number $Z$. In the same kinematical region, the angular distribution for bound-free...
Source: http://arxiv.org/abs/1203.2137v1
Recently developed series representations of the Boltzmann operator are used to obtain Quantum Mechanical results for the matrix elements, , of the imaginary time propagator. The calculations are done for two different potential surfaces: one of them is an Eckart Barrier and the other one is a double well potential surface. Numerical convergence of the series are investigated. Although the zeroth order term is sufficient at high temperatures, it does not lead to the correct saddle point...
Source: http://arxiv.org/abs/1203.5942v1
Arxiv.org
by Kelly R. Patton; Daniel E. Sheehy
texts

eye 82

favorite 0

comment 0

The induced intraspecies interactions among the majority species, mediated by the minority species, is computed for a population-imbalanced two-component Fermi gas. Although the Feshbach-resonance mediated interspecies interaction is dominant for equal populations, leading to singlet s-wave pairing, we find that in the strongly imbalanced regime the induced intraspecies interaction leads to p-wave pairing and superfluidity of the majority species. Thus, we predict that the observed spin-polaron...
Source: http://arxiv.org/abs/1203.6348v1
Arxiv.org
by Alejandro Adem; José Manuel Gómez
texts

eye 57

favorite 0

comment 0

In this note we study topological invariants of the spaces of homomorphisms Hom(\pi,G), where \pi\ is a finitely generated abelian group and G is a compact Lie group arising as an arbitrary finite product of the classical groups SU(r), U(q) and Sp(k).
Source: http://arxiv.org/abs/1203.5439v1
Arxiv.org
by E. Stonkutė; G. Tautvaišienė; B. Nordström; R. Ženovienė
texts

eye 42

favorite 0

comment 0

Galactic Archeology is a powerful tool for investigating the formation and evolution of the Milky Way. We use this technique to study kinematic groups of F- and G-stars in the solar neighbourhood. From correlations between orbital parameters, three new coherent groups of stars were recently identified and suggested to correspond to remnants of disrupted satellites. We determine detailed elemental abundances in stars belonging to one of these groups and compare their chemical composition with...
Source: http://arxiv.org/abs/1203.6199v1
Arxiv.org
texts

eye 52

favorite 0

comment 0

We briefly review the status of motivated beyond-the-MSSM phenomenology in the light of the LHC searches to date. In particular, we discuss the conceptual consequences of the exclusion bounds, of the hint for a Higgs boson at about 125 GeV, and of interpreting the excess of direct CP violation in the charm sector as a signal of New Physics. We try to go into the various topics in a compact way while providing a relatively rich list of references, with particular attention to the most recent...
Source: http://arxiv.org/abs/1203.6227v2
Arxiv.org
texts

eye 127

favorite 0

comment 0

A numerical method to integrate the time-dependent Hartree-Fock Bogoliubov (TDHFB) equations with Gogny interaction is proposed. The feasibility of the TDHFB code is illustrated by the conservation of the energy, particle numbers, and center-of-mass in the small amplitude vibrations of oxygen 20. The TDHFB code is applied to the isoscalar quadrupole and/or isovector dipole vibrations in the linear (small amplitude) region in oxygen isotopes (masses A = 18,20,22 and 24), titanium isotopes (A =...
Source: http://arxiv.org/abs/1203.6174v1
Arxiv.org
by A. Verdini; R. Grappin; R. Pinto; M. Velli
texts

eye 113

favorite 0

comment 0

We present a mechanism for the formation of the low frequency 1/f magnetic spectrum based on numerical solutions of a shell reduced-MHD model of the turbulent dynamics inside the sub-Alfv\'enic solar wind. We assign reasonably realistic profiles to the wind speed and the density along the radial direction, and a radial magnetic field. Alfv\'en waves of short periodicity (600 s) are injected at the base of the chromosphere, penetrate into the corona and are partially reflected, thus triggering a...
Source: http://arxiv.org/abs/1203.6219v2
Arxiv.org
texts

eye 44

favorite 0

comment 0

We study, in the framework of open quantum systems, the geometric phase acquired by a uniformly accelerated two-level atom undergoing nonunitary evolution due to its coupling to a bath of fluctuating vacuum electromagnetic fields in the multipolar scheme. We find that the phase variation due to the acceleration can be in principle observed via atomic interferometry between the accelerated atom and the inertial one, thus providing an evidence of the Unruh effect.
Source: http://arxiv.org/abs/1203.5869v1
Arxiv.org
by Jan O. Stenflo
texts

eye 27

favorite 0

comment 0

The Sun's magnetic field is structured over a range of scales that span approximately seven orders of magnitudes, four of which lie beyond the resolving power of current telescopes. Here we have used a Hinode SOT/SP deep mode data set for the quiet-sun disk center in combination with constraints from the Hanle effect to derive scaling laws that describe how the magnetic structuring varies from the resolved scales down to the magnetic diffusion limit, where the field ceases to be frozen-in. The...
Source: http://arxiv.org/abs/1203.6011v1
Arxiv.org
by M. Gennaro; A. Bik; W. Brandner; A. Stolte; B. Rochau; H. Beuther; D. Gouliermis; J. Tackenberg; N. Kudryavtseva; B. Hussmann; F. Schuller; Th. Henning
texts

eye 80

favorite 0

comment 0

We have started a campaign to identify massive star clusters inside bright molecular bubbles towards the Galactic Center. The CN15/16/17 molecular complex is the first example of our study. The region is characterized by the presence of two young clusters, DB10 and DB11, visible in the NIR, an ultra-compact HII region identified in the radio, several young stellar objects visible in the MIR, a bright diffuse nebulosity at 8\mu m coming from PAHs and sub-mm continuum emission revealing the...
Source: http://arxiv.org/abs/1203.5786v1
Arxiv.org
texts

eye 44

favorite 0

comment 0

Let $A \subseteq E$ be an extension of Hopf algebras such that there exists a normal left $A$-module coalgebra map $\pi : E \to A$ that splits the inclusion. We shall describe the set of all coquasitriangular structures on the Hopf algebra $E$ in terms of the datum $(A, E, \pi)$ as follows: first, any such extension $E$ is isomorphic to a unified product $A \ltimes H$, for some unitary subcoalgebra $H$ of $E$ (\cite{am2}). Then, as a main theorem, we establish a bijective correspondence between...
Source: http://arxiv.org/abs/1203.2455v1
Arxiv.org
texts

eye 74

favorite 0

comment 0

We have investigated the transmission and reflection properties of structures incorporating left-handed materials with graded index of refraction. We present an exact analytical solution to Helmholtz' equation for a graded index profile changing according to a hyperbolic tangent function along the propagation direction. We derive expressions for the field intensity along the graded index structure, and we show excellent agreement between the analytical solution and the corresponding results...
Source: http://arxiv.org/abs/1203.2311v1
Arxiv.org
by Wesam Gabran; Chun-Hao Liu; Przemysław Pawełczak; Danijela Cabric
texts

eye 97

favorite 0

comment 0

Accurate estimation of licensed channel Primary User's (PU) temporal statistics is important for Dynamic Spectrum Access (DSA) systems. With accurate estimation of the mean duty cycle, u, and the mean off- and on-times of PUs, DSA systems can more efficiently assign PU resources to its subscribers, thus, increasing channel utilization. This paper presents a mathematical analysis of the accuracy of estimating u, as well as the PU mean off- and on-times, where the estimation accuracy is expressed...
Source: http://arxiv.org/abs/1203.2393v2
Arxiv.org
by A. S. Sanz; Y. Elran; P. Brumer
texts

eye 53

favorite 0

comment 0

The effect of chaotic bath dynamics on the decoherence of a quantum system is examined for the vibrational degrees of freedom of a diatomic molecule in a realistic, constant temperature collisional bath. As an example, the specific case of I$_2$ in liquid xenon is examined as a function of temperature, and the results compared with an integrable xenon bath. A crossover in behavior is found: the integrable bath induces more decoherence at low bath temperatures than does the chaotic bath, whereas...
Source: http://arxiv.org/abs/1203.4629v2
Arxiv.org
by Sandro Gallo; Matthieu Lerasle; Daniel Yasumasa Takahashi
texts

eye 90

favorite 0

comment 0

We derive explicit upper bounds for the $\bar{d}$-distance between a chain of infinite order and its canonical $k$-steps Markov approximation. Our proof is entirely constructive and involves a "coupling from the past" argument. The new method covers non necessarily continuous probability kernels, and chains with null transition probabilities. These results imply in particular the Bernoulli property for these processes.
Source: http://arxiv.org/abs/1107.4353v2
Arxiv.org
by E. A. O'Brien; C. Voll
texts

eye 41

favorite 0

comment 0

We develop general formulae for the numbers of conjugacy classes and irreducible complex characters of finite p-groups of nilpotency class less than p. This allows us to unify and generalize a number of existing enumerative results, and to obtain new such results for generalizations of relatively free p-groups of exponent p. Our main tools are the Lazard correspondence and the Kirillov orbit method.
Source: http://arxiv.org/abs/1203.3050v1
Arxiv.org
by M. Arrayás; M. A. Fontelos; U. Kindelán
texts

eye 93

favorite 0

comment 0

We present the first analytical and numerical studies of the initial stage of the branching process based on an interface dynamics streamer model in the fully 3-D case. This model follows from fundamental considerations on charge production by impact ionization and balance laws, and leads to an equation for the evolution of the interface between ionized and non-ionized regions. We compare some experimental patterns with the numerically simulated ones, and give an explicit expression for the...
Source: http://arxiv.org/abs/1203.6790v1
Arxiv.org
by Lucas A. Cieza; Matthias R. Schreiber; Gisela A. Romero; Jonathan P. Williams; Alberto Rebassa-Mansergas; Bruno Merin
texts

eye 190

favorite 0

comment 0

As part of an ongoing program aiming to characterize a large number of Spitzer-selected transition disks (disks with reduced levels of near-IR and/or mid- IR excess emission), we have obtained (sub)millimeter wavelength photometry, high-resolution optical spectroscopy, and adaptive optics near-infrared imaging for a sample of 31 transition objects located in the Perseus, Taurus, and Auriga molecular clouds. We use these ground-based data to estimate disk masses, multiplicity, and accretion...
Source: http://arxiv.org/abs/1203.6849v1
Arxiv.org
by Mirko Klukas; Bijan Sahamie
texts

eye 99

favorite 0

comment 0

We apply spectral sequences to derive both an obstruction to the existence of $n$-fold prolongations and a topological classification. Prolongations have been used in the literature in an attempt to prove that every Engel structure on $M\times\mathbb{S}^1$ with characteristic line field tangent to the fibers is determined by the contact structure induced on a cross section and the twisting of the Engel structure along the fibers. Our results show that this statement needs some modification: to...
Source: http://arxiv.org/abs/1107.5884v3
Arxiv.org
by Z. Salman; E. Pomjakushina; V. Pomjakushin; A. Kanigel; K. Chashka; K. Conder; E. Morenzoni; T. Prokscha; K. Sedlak; A. Suter
texts

eye 91

favorite 0

comment 0

We present a detailed investigation of the magnetic and structural properties of magnetically doped 3D topological insulator Bi2Se3. From muon spin relaxation measurements in zero magnetic field, we find that even 5% Fe doping on the Bi site turns the full volume of the sample magnetic at temperatures as high as ~250 K. This is also confirmed by magnetization measurements. Two magnetic "phases" are identified; the first is observed between ~10-250 K while the second appears below ~10...
Source: http://arxiv.org/abs/1203.4850v1
Arxiv.org
texts

eye 49

favorite 0

comment 0

Dzhaparidze and Spreij [5] showed that the quadratic variation of a semimartingale can be approximated using a randomized periodogram. We show that the same approximation is valid for a special class of continuous stochastic processes. This class contains both semimartingales and non-semimartingales. The motivation comes partially from the recent work by Bender et al. [2], where it is shown that the quadratic variation of the log-returns determines the hedging strategy.
Source: http://arxiv.org/abs/1005.4349v2
Arxiv.org
by Jacob van den Berg; Demeter Kiss
texts

eye 46

favorite 0

comment 0

Let $E$ be the set of edges of the $d$-dimensional cubic lattice $\mathbb{Z}^d$, with $d\geq2$, and let $t(e),e\in E$, be nonnegative values. The passage time from a vertex $v$ to a vertex $w$ is defined as $\inf_{\pi:v\rightarrow w}\sum_{e\in\pi}t(e)$, where the infimum is over all paths $\pi$ from $v$ to $w$, and the sum is over all edges $e$ of $\pi$. Benjamini, Kalai and Schramm [2] proved that if the $t(e)$'s are i.i.d. two-valued positive random variables, the variance of the passage time...
Source: http://arxiv.org/abs/1007.0849v2
Arxiv.org
texts

eye 70

favorite 0

comment 0

In this paper, a study of random times on filtered probability spaces is undertaken. The main message is that, as long as distributional properties of optional processes up to the random time are involved, there is no loss of generality in assuming that the random time is actually a randomized stopping time. This perspective has advantages in both the theoretical and practical study of optional processes up to random times. Applications are given to the stochastic behavior of processes up to...
Source: http://arxiv.org/abs/1007.1124v3
Arxiv.org
by Guangxi Jin; Kun Cao; Guang-Can Guo; Lixin He
texts

eye 43

favorite 0

comment 0

"Magnetic ferroelectric" has been found in a wide range of spiral magnets. However, these materials all suffer from low critical temperatures, which are usually below 40 K, due to strong spin frustration. Recently, CuO has been found to be multiferroic at much higher ordering temperature ($\sim$ 230K). To clarify the origin of the high ordering temperature in CuO, we investigate the structural, electronic and magnetic properties of CuO via first-principles methods. We find that CuO...
Source: http://arxiv.org/abs/1007.2274v4
Arxiv.org
by S. H. P. Alencar; J. Bouvier; F. M. Walter; C. Dougados; J. -F. Donati; R. Kurosawa; M. Romanova; X. Bonfils; G. H. R. A. Lima; S. Massaro; M. Ibrahimov; E. Poretti
texts

eye 59

favorite 0

comment 0

We analyze the photometric and spectroscopic variability of the classical T Tauri star V2129 Oph over several rotational cycles to test the dynamical predictions of magnetospheric accretion models. The photometric variability and the radial velocity variations in the photospheric lines can be explained by rotational modulation due to cold spots, while the radial velocity variations of the He I (5876 \AA) line and the veiling variability are due to hot spot rotational modulation. The hot and...
Source: http://arxiv.org/abs/1203.6331v1
Arxiv.org
by J. de la Cruz Rodríguez; H. Socas-Navarro; M. Carlsson; J. Leenaarts
texts

eye 45

favorite 0

comment 0

The magnetic field of the quiet-Sun chromosphere remains a mystery for solar physicists. The reduced number of chromospheric lines are intrinsically hard to model and only a few of them are magnetically sensitive. In this work, we use a 3D numerical simulation of the outer layers of the solar atmosphere, to asses the reliability of non-LTE inversions, in this case applied to the Ca II 8542 \AA\ line. We show that NLTE inversions provide realistic estimates of physical quantities from synthetic...
Source: http://arxiv.org/abs/1203.4577v1
Arxiv.org
by Daniel Kolbe; Martin Scheid; Jochen Walz
texts

eye 53

favorite 0

comment 0

Continuous-wave coherent radiation in the vacuum ultraviolet (VUV)wavelength region at 121 nm will be essential for future laser-cooling of trapped antihydrogen [1]. Cold antihydrogen will enable both tests of the fundamental symmetry between matter and antimatter at unprecedented experimental precision [2] and also experiments in antimatter gravity [3]. Another fascinating application of narrowband continuous laser radiation in the VUV is quantum information processing using single trapped...
Source: http://arxiv.org/abs/1203.2121v1
We discuss quantum electrodynamics emerging in the vacua with anisotropic scaling. Systems with anisotropic scaling were suggested by Horava in relation to the quantum theory of gravity. In such vacua the space and time are not equivalent, and moreover they obey different scaling laws, called the anisotropic scaling. Such anisotropic scaling takes place for fermions in bilayer graphene, where if one neglects the trigonal warping effects the massless Dirac fermions have quadratic dispersion....
Source: http://arxiv.org/abs/1203.1578v3
Arxiv.org
by Gonzalo A. Alvarez; Alexandre M. Souza; Dieter Suter
texts

eye 58

favorite 0

comment 0

The loss of quantum information due to interaction with external degrees of freedom, which is known as decoherence, remains one of the main obstacles for large-scale implementations of quantum computing. Accordingly, different measures are being explored for reducing its effect. One of them is dynamical decoupling (DD) which offers a practical solution because it only requires the application of control pulses to the system qubits. Starting from basic DD sequences, more sophisticated schemes...
Source: http://arxiv.org/abs/1203.0252v1
Arxiv.org
texts

eye 43

favorite 0

comment 0

The Generalized Traveling Salesman Problem (GTSP) is a well-known combinatorial optimization problem with a host of applications. It is an extension of the Traveling Salesman Problem (TSP) where the set of cities is partitioned into so-called clusters, and the salesman has to visit every cluster exactly once. While the GTSP is a very important combinatorial optimization problem and is well studied in many aspects, the local search algorithms used in the literature are mostly basic adaptations...
Source: http://arxiv.org/abs/1005.5525v4
Arxiv.org
by Cecilia Cavaterra; Elisabetta Rocca
texts

eye 65

favorite 0

comment 0

The present contribution investigates the well-posedness of a PDE system describing the evolution of a nematic liquid crystal flow under kinematic transports for molecules of different shapes. More in particular, the evolution of the {\em velocity field} $\ub$ is ruled by the Navier-Stokes incompressible system with a stress tensor exhibiting a special coupling between the transport and the induced terms. The dynamic of the {\em director field} $\bd$ is described by a variation of a parabolic...
Source: http://arxiv.org/abs/1107.3947v2
Arxiv.org
by Silvio Franz; Giorgio Parisi; Federico Ricci-Tersenghi
texts

eye 168

favorite 0

comment 0

We consider the critical properties of points of continuous glass transition as one can find in liquids in presence of constraints or in liquids in porous media. Through a one loop analysis we show that the critical Replica Field Theory describing these points can be mapped in the $\phi^4$-Random Field Ising Model. We confirm our analysis studying the finite size scaling of the $p$-spin model defined on sparse random graph, where a fraction of variables is frozen such that the phase transition...
Source: http://arxiv.org/abs/1203.4849v3
Arxiv.org
by Julian Sonner; Andrew G. Green
texts

eye 50

favorite 0

comment 0

The dynamical scaling of quantum critical systems in thermal equilibrium may be inherited in the driven steady-state, leading to universal out-of-equilibrium behaviour. This attractive notion has been demonstrated in just a few cases. We demonstrate how holography - a mapping between the quantum critical system and a gravity dual - provides an illuminating perspective and new results. Non-trivial out-of-equilibrium universality is particularly apparent in current noise, which is dual to Hawking...
Source: http://arxiv.org/abs/1203.4908v2
Arxiv.org
by Andrei Khrennikov; Elemer E. Rosinger
texts

eye 95

favorite 0

comment 0

Motivated by the novel applications of the mathematical formalism of quantum theory and its generalizations in cognitive science, psychology, social and political sciences, and economics, we extend the notion of the tensor product and entanglement. We also study the relation between conventional entanglement of complex qubits and our generalized entanglement. Our construction can also be used to describe entanglement in the framework of non-Archimedean physics. It is also possible to construct...
Source: http://arxiv.org/abs/1203.0412v1
Arxiv.org
by Jana Jurečková; Jan Kalina
texts

eye 155

favorite 0

comment 0

Although unbiasedness is a basic property of a good test, many tests on vector parameters or scalar parameters against two-sided alternatives are not finite-sample unbiased. This was already noticed by Sugiura [Ann. Inst. Statist. Math. 17 (1965) 261--263]; he found an alternative against which the Wilcoxon test is not unbiased. The problem is even more serious in multivariate models. When testing the hypothesis against an alternative which fits well with the experiment, it should be verified...
Source: http://arxiv.org/abs/1203.0450v1
Arxiv.org
by Aaron D. Lauda; Heather M. Russell
texts

eye 88

favorite 0

comment 0

We identify the ring of odd symmetric functions introduced by Ellis and Khovanov as the space of skew polynomials fixed by a natural action of the Hecke algebra at q=-1. This allows us to define graded modules over the Hecke algebra at q=-1 that are `odd' analogs of the cohomology of type A Springer varieties. The graded module associated to the full flag variety corresponds to the quotient of the skew polynomial ring by the left ideal of nonconstant odd symmetric functions. The top degree...
Source: http://arxiv.org/abs/1203.0797v1
Arxiv.org
texts

eye 43

favorite 0

comment 0

We consider the recurrence and transience problem for a time-homogeneous Markov chain on the real line with transition kernel $p(x,dy)=f_x(y-x)dy$, where the density functions $f_x(y)$, for large $|y|$, have a power-law decay with exponent $\alpha(x)+1$, where $\alpha(x)\in(0,2)$. In this paper, under a uniformity condition on the density functions $f_x(y)$ and some mild technical conditions, we prove that when $\liminf_{|x|\longrightarrow\infty}\alpha(x)>1$, the chain is recurrent, while...
Source: http://arxiv.org/abs/1203.0447v1
Arxiv.org
by Jeffrey G. Rau; Hae-Young Kee
texts

eye 46

favorite 0

comment 0

We propose a candidate for the hidden order in URu2Si2: a rank-5 E type spin density wave between Uranium 5f crystal field doublets breaking time reversal and lattice tetragonal symmetry in a manner consistent with recent torque measurements [R. Okazaki et al, Science 331, 439 (2011)]. We argue that coupling of this order parameter to magnetic probes can be hidden by crystal field effects, while still having significant effects on transport, thermodynamics and magnetic susceptibilities. In a...
Source: http://arxiv.org/abs/1203.1047v2
Arxiv.org
by Leonardo Motta; Robert R. Caldwell
texts

eye 44

favorite 0

comment 0

We show that a conformal-invariance violating coupling of the inflaton to electromagnetism produces a cross correlation between curvature fluctuations and a spectrum of primordial magnetic fields. According to this model, in the case of power-law inflation, a primordial magnetic field is generated with a nearly flat power spectrum and rms amplitude ranging from nG to pG. We study the cross correlation, a three-point function of the curvature perturbation and two powers of the magnetic field, in...
Source: http://arxiv.org/abs/1203.1033v1
Arxiv.org
by Giacomo Ceccarelli; Christian Torrero
texts

eye 52

favorite 0

comment 0

In the framework of the trap-size scaling theory, we study the scaling properties of the Bose-Hubbard model in two dimensions in the presence of a trapping potential at finite temperature. In particular, we provide results for the particle density and the density-density correlator at the Mott transitions and within the superfluid phase. For the former quantity, numerical outcomes are also extensively compared to Local Density Approximation predictions.
Source: http://arxiv.org/abs/1203.2030v3
Arxiv.org
by N. Derzsy; Z. Neda; M. A. Santos
texts

eye 58

favorite 0

comment 0

We analyze the income distribution of employees for 9 consecutive years (2001-2009) using a complete social security database for an economically important district of Romania. The database contains detailed information on more than half million taxpayers, including their monthly salaries from all employers where they worked. Besides studying the characteristic distribution functions in the high and low/medium income limits, the database allows us a detailed dynamical study by following the...
Source: http://arxiv.org/abs/1203.1880v1
Arxiv.org
texts

eye 179

favorite 0

comment 0

A Bayesian nonparametric approach to the study of species diversity based on choosing a random discrete distribution as a prior model for the unknown relative abundances of species has been recently introduced in Lijoi et al. (2007, 2008). Explicit posterior predictive estimation of {\it species richness} has been obtained under priors belonging to the $\alpha$-Gibbs class (Gnedin & Pitman, 2006). Here we focus on posterior estimation of {\it species evenness} which accounts for diversity...
Source: http://arxiv.org/abs/1203.1666v1
Arxiv.org
by D. Meloni; S. Morisi; E. Peinado
texts

eye 73

favorite 0

comment 0

In the light of the recent Daya Bay result the reactor angle is about 9 degrees, we reconsider the model presented in arXiv:1005.3482 showing that, when all neutrino oscillation parameters are taken at their best fit values of Schwetz et al and the reactor angle to be the central value of Daya Bay, the predicted value of the CP phase is approximately 45 degrees.
Source: http://arxiv.org/abs/1203.2535v1
Arxiv.org
texts

eye 37

favorite 0

comment 0

[abridged] We report a series of simulations of the formation of a star cluster similar to the Orion Nebula Cluster (ONC), including both radiative transfer and protostellar outflows, and starting from both smooth and self-consistently turbulent initial conditions. Each simulation forms >150 stars and brown dwarfs, yielding a stellar mass distribution from < 0.1 to > 10 Msun. We show that a simulation that begins with self-consistently turbulence embedded in a larger turbulent volume,...
Source: http://arxiv.org/abs/1203.2620v2
Arxiv.org
by R. Giostri; M. Vargas dos Santos; I. Waga; R. R. R. Reis; M. O. Calvão; B. L. Lago
texts

eye 49

favorite 0

comment 0

We use type Ia supernovae (SN Ia) data in combination with recent baryonic acoustic oscillations (BAO) and cosmic microwave background (CMB) observations to constrain a kink-like parametrization of the deceleration parameter ($q$). This $q$-parametrization can be written in terms of the initial ($q_i$) and present ($q_0$) values of the deceleration parameter, the redshift of the cosmic transition from deceleration to acceleration ($z_t$) and the redshift width of such transition ($\tau$). By...
Source: http://arxiv.org/abs/1203.3213v1
Arxiv.org
texts

eye 83

favorite 0

comment 0

In a recent paper, Gabriel Navarro and Pham Huu Tiep show that the so-called Alperin Weight Conjecture can be verified via the Classification of the Finite Simple Groups, provided any simple group fulfills a very precise list of conditions. Our purpose here is to show that the equivariant refinement of the Alperin's Conjecture for blocks formulated by Geoffrey Robinson in the eighties can be reduced to checking the same statement on any central k*-extension of any finite almost-simple group, or...
Source: http://arxiv.org/abs/1203.3851v3
Arxiv.org
by Oriane Aubert; Michael Le Bars; Patrice Le Gal; Philip S. Marcus
texts

eye 60

favorite 0

comment 0

We validate a new law for the aspect ratio $\alpha = H/L$ of vortices in a rotating, stratified flow, where $H$ and $L$ are the vertical half-height and horizontal length scale of the vortices. The aspect ratio depends not only on the Coriolis parameter f and buoyancy (or Brunt-Vaisala) frequency $\bar{N}$ of the background flow, but also on the buoyancy frequency $N_c$ within the vortex and on the Rossby number $Ro$ of the vortex such that $\alpha = f \sqrt{[Ro (1 + Ro)/(N_c^2- \bar{N}^2)]}$....
Source: http://arxiv.org/abs/1203.1562v1
Arxiv.org
by Masazumi Honda; Yutaka Yoshida
texts

eye 34

favorite 0

comment 0

We show a large N reduction on S^3 in a BPS sector for a broad class of theories : N>=2 supersymmetric Chern-Simons theory with any number of adjoint and bi-fundamental chiral multiplets.We show that a localization method can be applied to the reduced model and the path integral can be written by a multi-contour integral. By taking a particular localization configuration, we also show that the large N equivalence between the original theory on S^3 and the reduced model holds for the free...
Source: http://arxiv.org/abs/1203.1016v2
Arxiv.org
by T. Wasak; J. Chwedenczuk; P. Zin; M. Trippenbach
texts

eye 49

favorite 0

comment 0

It is demonstrated that measurements of positions of atoms scattered from a quasi-condensate in a Raman process provide information on the temperature of the parent cloud. In particular, the widths of the density and second order correlation functions are sensitive to the phase fluctuations induced by non-zero temperature of the quasi-condensate. It is also shown how these widths evolve during expansion of the cloud of scattered atoms. These results are useful for planning future Raman...
Source: http://arxiv.org/abs/1203.0894v1
Arxiv.org
by Diego Muñoz; Volker Springel; Robert Marcus; Mark Vogelsberger; Lars Hernquist
texts

eye 145

favorite 0

comment 0

Numerous formulations of finite volume schemes for the Euler and Navier-Stokes equations exist, but in the majority of cases they have been developed for structured and stationary meshes. In many applications, more flexible mesh geometries that can dynamically adjust to the problem at hand and move with the flow in a (quasi) Lagrangian fashion would, however, be highly desirable, as this can allow a significant reduction of advection errors and an accurate realization of curved and moving...
Source: http://arxiv.org/abs/1203.1037v1
Arxiv.org
by A. Bazavov; Tanmoy Bhattacharya; C. E. DeTar; H. -T. Ding; Steven Gottlieb; Rajan Gupta; P. Hegde; Urs Heller; F. Karsch; E. Laermann; L. Levkova; Swagato Mukherjee; P. Petreczky; Christian Schmidt; R. A. Soltz; W. Soeldner; R. Sugar; Pavlos M. Vranas
texts

eye 44

favorite 0

comment 0

We calculate the quadratic fluctuations of net baryon number, electric charge and strangeness as well as correlations among these conserved charges in (2+1)-flavor lattice QCD at zero chemical potential. Results are obtained using calculations with tree level improved gauge and the highly improved staggered quark (HISQ) actions with almost physical light and strange quark masses at three different values of the lattice cut-off. Our choice of parameters corresponds to a value of 160 MeV for the...
Source: http://arxiv.org/abs/1203.0784v2
Arxiv.org
by Mugurel Ţolea; Bogdan Ostahie; Marian Niţă; Felicia Ţolea; Alexandru Aldea
texts

eye 43

favorite 0

comment 0

The phase of the electronic wave function is not directly measurable but, quite remarkably, it becomes accessible in pairs of isospectral shapes, as recently proposed in the experiment of Christopher R. Moon {\it et al.}, Science {\bf 319}, 782 (2008). The method is based on a special property, called transplantation, which relates the eigenfunctions of the isospectral pairs, and allows to extract the phase distributions, if the amplitude distributions are known. We numerically simulate such a...
Source: http://arxiv.org/abs/1203.0717v1
Arxiv.org
by Joseph Losby; Jacob A. J. Burgess; Zhu Diao; David C. Fortin; Wayne K. Hiebert; Mark R. Freeman
texts

eye 64

favorite 0

comment 0

We report on the fabrication of sensitive nanotorsional resonators, which can be utilized as magnetometers for investigating the magnetization dynamics in small magnetic elements. The thermo-mechanical noise is calibrated with the resonator displacement in order to determine the ultimate mechanical torque sensitivity of the magnetometer.
Source: http://arxiv.org/abs/1203.0998v1
Arxiv.org
by Sahin Buyukdagli; Tapio Ala-Nissila
texts

eye 68

favorite 0

comment 0

The remarkably low experimental values of the capacitance data of carbon based materials in contact with water solvent needs to be explained from a microscopic theory in order to optimize the efficiency of these materials. We show that this experimental result can be explained by the dielectric screening deficiency of the electrostatic potential, which in turn results from the interfacial solvent depletion effect driven by image dipole interactions. We show this by deriving from the microscopic...
Source: http://arxiv.org/abs/1203.2285v1
Arxiv.org
texts

eye 78

favorite 0

comment 0

The purpose of this paper is to prove the uniqueness theorem of solutions of eigenvalue equations on one end of Riemannian manifolds for drift Laplacians, including the standard Laplacian as a special case; we shall impose "a sort of radiation condition" at infinity on solutions. We shall also provide several Riemannian manifolds whose Laplacians satisfy the absence of embedded eigenvalues and besides the absolutely continuity, although growth orders of their metrics on ends are very...
Source: http://arxiv.org/abs/1203.2310v1
Arxiv.org
by Minoru Kubota
texts

eye 35

favorite 0

comment 0

The quantized vortex state appearing in the recently discovered new states in hcp 4He since their discovery is discussed. Special attention is given to evidence for the vortex state as the vortex fluid (VF) state and its transition into the supersolid (SS) state. Its features are described. The historical expla- nations for the SS state in quantum solids such as solid 4He were based on the idea of Bose Einstein Condensation (BEC) of the imperfections such as va- cancies, interstitials and other...
Source: http://arxiv.org/abs/1203.6824v1
Arxiv.org
texts

eye 38

favorite 0

comment 0

A cocycle $\Omega: P \times G \to H$ taking values in a Lie group $H$ for a free right action of $G$ on $P$ defines a principal bundle $Q$ with the structure group $H$ over $P/G.$ The Chern character of a vector bundle associated to $Q$ defines then characteristic classes on $X.$ This observation becomes useful in the case of infinite dimensional groups. It typically happens that a representation of $G$ is not given by linear operators which differ from the indentity by a trace-class operator....
Source: http://arxiv.org/abs/1203.0245v2
Arxiv.org
by Maxim Vashkevich; Alexander Petrovsky
texts

eye 40

favorite 0

comment 0

A fast Discrete Cosine Transform (DCT) algorithm is introduced that can be of particular interest in image processing. The main features of the algorithm are regularity of the graph and very low arithmetic complexity. The 16-point version of the algorithm requires only 32 multiplications and 81 additions. The computational core of the algorithm consists of only 17 nontrivial multiplications, the rest 15 are scaling factors that can be compensated in the post-processing. The derivation of the...
Source: http://arxiv.org/abs/1203.3442v2
Arxiv.org
by Anna De Masi; Errico Presutti; Dimitrios Tsagkarogiannis; Maria Eulalia Vares
texts

eye 45

favorite 0

comment 0

We consider the symmetric simple exclusion process in the interval $\La_N:=[-N,N]\cap\mathbb Z$ with births and deaths taking place respectively on suitable boundary intervals $I_+$ and $I_-$, as introduced in De Masi et al. (J. Stat. Phys. 2011). We study the stationary measure density profile in the limit $N\to\infty$
Source: http://arxiv.org/abs/1203.1795v1
Arxiv.org
by Andreas Schäfer; Jian Zhou
texts

eye 61

favorite 0

comment 0

We reexamine the scale dependence of the ETQS (Efremov-Teryaev-Qiu-Sterman) twist-3 matrix element which has been studied already by the four different groups with conflicting results Ref.[1-4]. We find that we can in fact reproduce the results of Ref.[4] with the method Ref.[4] when we treat some subtleties with greater care, thus easing the mentioned conflict.
Source: http://arxiv.org/abs/1203.5293v1
We use the framework of the HIJING/B\=B v2.0 model to simulate high-multiplicity (HM) $p+p$ collision events at the Large Hadron Collider (LHC) to study observables sensitive to possible collective phenomena, such as strong longitudinal color fields (SLCF) modeled by an enhanced string tension ($\kappa$). We focus on the hyperon/meson yield ratios at center-of-mass (c.m.) energy $\sqrt{s}$ = 7 TeV, in the transverse momentum region, $1 < p_T < 4 $ GeV/{\it c}. For minimum bias events...
Source: http://arxiv.org/abs/1203.6679v2
Arxiv.org
by Andre Chatzistamatiou
texts

eye 49

favorite 0

comment 0

We prove the following criterion for the pro-representability of the deformation cohomology of a commutative formal Lie group. Let f be a flat and separated morphism between noetherian schemes. Assume that the target of f is flat over the integers. For a commutative formal Lie group E, we have the deformation cohomology of f with coefficients in E at our disposal. If the higher direct images of the tangent space of E are locally free and of finite rank then the deformation cohomology is...
Source: http://arxiv.org/abs/1203.4926v3
Arxiv.org
by Volodymyr Mazorchuk; Benjamin Steinberg
texts

eye 98

favorite 0

comment 0

In this paper we discuss various aspects of the problem of determining the minimal dimension of an injective linear representation of a finite semigroup over a field. We outline some general techniques and results, and apply them to numerous examples.
Source: http://arxiv.org/abs/1107.1413v3
Arxiv.org
by H. F. Chau; C. -K. Li; Y. -T. Poon; N. -S. Sze
texts

eye 47

favorite 0

comment 0

Recently, Chau [Quant. Inform. & Comp. 11, 721 (2011)] showed that one can define certain metrics and pseudo-metrics on U(n), the group of all $n\times n$ unitary matrices, based on the arguments of the eigenvalues of the unitary matrices. More importantly, these metrics and pseudo-metrics have quantum information theoretical meanings. So it is instructive to study this kind of metrics and pseudo-metrics on U(n). Here we show that any symmetric norm on ${\mathbb R}^n$ induces a metric on...
Source: http://arxiv.org/abs/1107.1047v2
Arxiv.org
by Jason Matthews; David Sánchez; Marcus Larsson; Heiner Linke
texts

eye 39

favorite 0

comment 0

The response of electric devices to an applied thermal gradient has, so far, been studied almost exclusively in two-terminal devices. Here we present measurements of the response to a thermal bias of a four-terminal, quasi-ballistic junction with a central scattering site. We find a novel transverse thermovoltage measured across isothermal contacts. Using a multi-terminal scattering model extended to the weakly non-linear voltage regime, we show that the device's response to a thermal bias can...
Source: http://arxiv.org/abs/1107.3179v3
Arxiv.org
by L. V. Bork; D. I. Kazakov; G. S. Vartanov
texts

eye 131

favorite 0

comment 0

In this paper we develop a supersymmetric version of unitarity cut method for form factors of operators from the chiral truncation of the the $\mathcal{N}=4$ stress-tensor current supermultiplet $T^{AB}$. The relation between the superform factor with supermomentum equals to zero and the logarithmic derivative of the superamplitude with respect to the coupling constant is discussed and verified at tree- and one-loop level for any MHV $n$-point ($n \geq 4$) superform factor involving operators...
Source: http://arxiv.org/abs/1107.5551v3
Arxiv.org
by Friedemann Brock; Francesco Chiacchio; Anna Mercaldo
texts

eye 109

favorite 0

comment 0

This paper deals with weighted isoperimetric inequalities relative to cones of $\mathbb{R}^{N}$. We study the structure of measures that admit as isoperimetric sets the intersection of a cone with balls centered at the vertex of the cone. For instance, in case that the cone is the half-space $\mathbb{R}_{+}^{N}={x \in \mathbb{R}^{N} : x_{N}>0}$ and the measure is factorized, we prove that this phenomenon occurs if and only if the measure has the form $d\mu=ax_{N}^{k}\exp(c|x|^{2})dx $, for...
Source: http://arxiv.org/abs/1107.5406v4
Arxiv.org
by P. S. Burada; B. Lindner
texts

eye 51

favorite 0

comment 0

We study the dynamics of an active Brownian particle with a nonlinear friction function located in a spatial cubic potential. For strong but finite damping, the escape rate of the particle over the spatial potential barrier shows a nonmonotonic dependence on the noise intensity. We relate this behavior to the fact that the active particle escapes from a limit cycle rather than from a fixed point and that a certain amount of noise can stabilize the sojourn of the particle on this limit cycle.
Source: http://arxiv.org/abs/1203.6814v1
Arxiv.org
by A. E. Koudou; P. Vallois
texts

eye 36

favorite 0

comment 0

We define Letac-Wesolowski-Matsumoto-Yor (LWMY) functions as decreasing functions from $(0,\infty)$ onto $(0,\infty)$ with the following property: there exist independent, positive random variables $X$ and $Y$ such that the variables $f(X+Y)$ and $f(X)-f(X+Y)$ are independent. We prove that, under additional assumptions, there are essentially four such functions. The first one is $f(x)=1/x$. In this case, referred to in the literature as the Matsumoto-Yor property, the law of $X$ is generalized...
Source: http://arxiv.org/abs/1203.0381v1
Arxiv.org
by Pedro Ruiz-Femenia
texts

eye 47

favorite 0

comment 0

The recent developments on the computation of non-resonant corrections to the e+ e- -> W+ W- b bbar cross section in the top-antitop resonance region are reviewed in this talk. Non-resonant production of the final state W+ W- b bbar starts to contribute at NLO in the nonrelativistic power-counting v ~ alpha_s ~ sqrt(alpha_EW). The corrections induced by non-resonant effects reduce the cross section in the top-antitop resonance peak region at a level which is comparable to the expected...
Source: http://arxiv.org/abs/1203.0934v1
Arxiv.org
by Spyros Basilakos; Athina Pouri
texts

eye 67

favorite 0

comment 0

We place tight constraints on the growth index $\gamma$ by using the recent growth history results of 2dFGRS, SDSS-LRG, VIMOS-VLT deep Survey (VVDS) and {\em WiggleZ} datasets. In particular, we investigate several parametrizations of the growth index $\gamma(z)$, by comparing their cosmological evolution using observational growth rate data at different redshifts. Utilizing a standard likelihood analysis we find that the use of the combined growth data provided by the 2dFGRS, SDSS-LRG, VVDS...
Source: http://arxiv.org/abs/1203.6724v2
Arxiv.org
texts

eye 46

favorite 0

comment 0

We reanalyze the Fermi spectra of the Geminga and Vela pulsars. We find that the spectrum of Geminga above the break is exceptionally well approximated by a simple power law without the exponential cut-off, making Geminga's spectrum similar to that of Crab. Vela's broadband gamma-ray spectrum is equally well fit with both the exponential cut-off and the double power law shapes. In the broadband double power-law fits, for a typical Fermi spectrum of a bright \gamma-ray pulsar, most of the errors...
Source: http://arxiv.org/abs/1203.1860v1
Arxiv.org
by Jian-Feng Li; Hong-Tao Feng; Yu Jiang; Wei-Min Sun; Hong-Shi Zong
texts

eye 95

favorite 0

comment 0

We study dynamical chiral symmetry breaking (DCSB) in an effective QED$_{3}$ theory of d-wave high temperature cuprate superconductors under a uniform magnetic field. At zero temperature, the external magnetic field induces a mixed state by generating vortices in the condensate of charged holons. The growing magnetic field suppresses the superfluid density and thus reduces the gauge field mass which is opened via the Anderson-Higgs mechanism. By numerically solving the Dyson-Schwinger gap...
Source: http://arxiv.org/abs/1203.6423v1
Arxiv.org
by Vassili Kolokoltsov; Wei Yang
texts

eye 138

favorite 0

comment 0

This paper has a two-folded purpose. First, we attempt to outline the development of the turnpike theorems in the the last several decades. Second, we study turnpike theorems in finite-horizon two-person zero-sum Markov games on a general Borel state space. Utilising the Bellman (or Shapley) operator defined for this game, we prove the stochastic versions of the early turnpike theorem on the set of optimal strategies and the middle turnpike theorem on the distribution of the state space.
Source: http://arxiv.org/abs/1203.6553v1
Arxiv.org
by Morgan W. Mitchell; Marco Koschorreck; Marcin Kubasik; Mario Napolitano; Robert J. Sewell
texts

eye 54

favorite 0

comment 0

An extensive debate on quantum non-demolition (QND) measurement, reviewed in Grangier et al. [Nature, {\bf 396}, 537 (1998)], finds that true QND measurements must have both non-classical state-preparation capability and non-classical information-damage tradeoff. Existing figures of merit for these non-classicality criteria require direct measurement of the signal variable and are thus difficult to apply to optically-probed material systems. Here we describe a method to demonstrate both...
Source: http://arxiv.org/abs/1203.6584v1
Arxiv.org
by Yannick Chevalier; Mounira Kourjieh
texts

eye 45

favorite 0

comment 0

We present in this paper a new procedure to saturate a set of clauses with respect to a well-founded ordering on ground atoms such that A < B implies Var(A) {\subseteq} Var(B) for every atoms A and B. This condition is satisfied by any atom ordering compatible with a lexicographic, recursive, or multiset path ordering on terms. Our saturation procedure is based on a priori ordered resolution and its main novelty is the on-the-fly construction of a finite complexity atom ordering. In contrast...
Source: http://arxiv.org/abs/1203.2809v1
Arxiv.org
by Vassilios Gregoriades
texts

eye 80

favorite 0

comment 0

We present the effective version of the theorem about turning Borel sets in Polish spaces into clopen sets while preserving the Borel structure of the underlying space. We show that under some conditions the emerging parameters can be chosen in a hyperarithmetical way and using this we prove a uniformity result.
Source: http://arxiv.org/abs/1203.6874v1
We present the results of a search for pair production of scalar bottom quarks ($\tilde b_1$) and scalar third-generation leptoquarks ($LQ_3$) in a data sample of 5.2 $fb^{-1}$ collected by the D0 experiment at the Tevatron, the $p\bar{p}$ collider at Fermilab. We assume that sbottoms decay to a neutralino ($\tilde \chi^0_1$) and a b quark, and we set 95% C.L. lower limits on their production in the ($m_{\tilde b_1}$, $m_{\tilde \chi^0_1}$) mass plane such that $m_{\tilde b_1} > 247$ GeV for...
Source: http://arxiv.org/abs/1203.6800v1
Arxiv.org
by Mohsen Sardari; Ahmad Beirami; Faramarz Fekri
texts

eye 90

favorite 0

comment 0

Recently, the existence of considerable amount of redundancy in the Internet traffic has stimulated the deployment of several redundancy elimination techniques within the network. These techniques are often based on either packet-level Redundancy Elimination (RE) or Content-Centric Networking (CCN). However, these techniques cannot exploit sub-packet redundancies. Further, other alternative techniques such as the end-to-end universal compression solutions would not perform well either over the...
Source: http://arxiv.org/abs/1203.6864v1
Arxiv.org
by D. Wilms; P. Virnau; S. Sengupta; K. Binder
texts

eye 79

favorite 0

comment 0

Langevin Dynamics simulations are used to study the effect of shear on a two-dimensional colloidal crystal confined by structured parallel walls. When walls are sheared very slowly, only two or three crystalline layers next to the walls move along with them, while the inner layers of the crystal are only slightly tilted. At higher shear velocities, this inner part of the crystal breaks into several pieces with different orientations. The velocity profile across the slit is reminiscent of...
Source: http://arxiv.org/abs/1203.3669v1
Arxiv.org
texts

eye 38

favorite 0

comment 0

Recently, it has been shown that a quantize-map-and-forward scheme approximately achieves (within a constant number of bits) the Gaussian relay network capacity for arbitrary topologies. This was established using Gaussian codebooks for transmission and random mappings at the relays. In this paper, we show that the same approximation result can be established by using lattices for transmission and quantization along with structured mappings at the relays.
Source: http://arxiv.org/abs/1005.1284v2
Arxiv.org
by Mehdi Talamali; Viljo Petäjä; Damien Vandembroucq; Stéphane Roux
texts

eye 33

favorite 0

comment 0

A mesoscopic model for shear plasticity of amorphous materials in two dimensions is introduced, and studied through numerical simulations in order to elucidate the macroscopic (large scale) mechanical behavior. Plastic deformation is assumed to occur through a series of local reorganizations. Using a discretization of the mechanical fields on a discrete lattice, local reorganizations are modeled as local slip events. Local yield stresses are randomly distributed in space and invariant in time....
Source: http://arxiv.org/abs/1005.2463v3
Arxiv.org
by A. Hill; A. Sinner; K. Ziegler
texts

eye 48

favorite 0

comment 0

We calculate the optical Hall conductivity within the Kubo formalism for systems with gapped spectral nodes, where the latter have a power-law dispersion with exponent n. The optical conductivity is proportional to n and there is a characteristic logarithmic singularity as the frequency approaches the gap energy. The optical Hall conductivity is almost unaffected by thermal fluctuations and disorder for n=1, whereas disorder has a stronger effect on transport properties if n=2.
Source: http://arxiv.org/abs/1005.3211v3
For a semi-abelian variety over a global function field which is isogenous to an isotrivial one, we show that on the product of local points of a subvariety satisfying a minor condition, the topological closure of a finitely generated subgroup of %the group of its global points cuts out exactly the global points of the subvariety lying in this subgroup. As a corollary, on every non-isotrivial super-singular curve of genus two over a global function field, we conclude that the Brauer-Manin...
Source: http://arxiv.org/abs/1005.4998v3
Arxiv.org
by Mark Adler; Eric Nordenstam; Pierre van Moerbeke
texts

eye 82

favorite 0

comment 0

In 1962, Dyson introduced dynamics in random matrix models, in particular into GUE (also for beta=1 and 4), by letting the entries evolve according to independent Ornstein-Uhlenbeck processes. Dyson shows the spectral points of the matrix evolve according to non-intersecting Brownian motions. The present paper shows that the interlacing spectra of two consecutive principal minors form a Markov process (diffusion) as well. This diffusion consists of two sets of Dyson non-intersecting Brownian...
Source: http://arxiv.org/abs/1007.0220v3
Arxiv.org
texts

eye 72

favorite 0

comment 0

Let $H$ be a locally compact group, $K$ be an LCA group, $\tau:H\to Aut(K)$ be a continuous homomorphism and $G_\tau=H\ltimes_\tau K$ be the semi-direct product of $H$ and $K$ with respect to the continuous homomorphism $\tau$. In this article we introduce the $\tau\times\hat{\tau}$-time frequency group $G_{\tau\times\hat{\tau}}$. We define the $\tau\times\hat{\tau}$-continuous Gabor transform of $f\in L^2(G_\tau)$ with respect to a window function $u\in L^2(K)$ as a function defined on...
Source: http://arxiv.org/abs/1203.1517v1
Arxiv.org
by Meera Sitharam; Aysegul Ozkan; James Pence; Jorg Peters
texts

eye 58

favorite 0

comment 0

To elucidate the structure of assembly configuration spaces, the EASAL software combines classical concepts, such as stratifications of semialgebraic sets, with recent algorithms for efficiently realizing geometric constraint systems, and theoretical advances concerning convex parametrization: in contrast to folding configuration spaces, most regions of assembly and packing configurations admit a convex parametrization. This allows for a novel, efficient and intuitive representation of...
Source: http://arxiv.org/abs/1203.3811v1
Arxiv.org
by Francis Bach; Simon Lacoste-Julien; Guillaume Obozinski
texts

eye 37

favorite 0

comment 0

We show that the herding procedure of Welling (2009) takes exactly the form of a standard convex optimization algorithm--namely a conditional gradient algorithm minimizing a quadratic moment discrepancy. This link enables us to invoke convergence results from convex optimization and to consider faster alternatives for the task of approximating integrals in a reproducing kernel Hilbert space. We study the behavior of the different variants through numerical simulations. The experiments indicate...
Source: http://arxiv.org/abs/1203.4523v2
Arxiv.org
by Maria Rita Casali; Paola Cristofori; Michele Mulazzani
texts

eye 34

favorite 0

comment 0

The idea of computing Matveev complexity by using Heegaard decompositions has been recently developed by two different approaches: the first one for closed 3-manifolds via crystallization theory, yielding the notion of Gem-Matveev complexity; the other one for compact orientable 3-manifolds via generalized Heegaard diagrams, yielding the notion of modified Heegaard complexity. In this paper we extend to the non-orientable case the definition of modified Heegaard complexity and prove that for...
Source: http://arxiv.org/abs/1203.0183v1