total 536took 0.12s

Looking Under a Better Lamppost: MeV-scale Dark Matter CandidatesMar 14 2019The era of precision cosmology has revealed that about 85% of the matter in the universe is dark matter. Two well-motivated candidates are weakly interacting massive particles (WIMPs) and weakly interacting sub-eV particles (WISPs) (e.g. axions). Both ... More

Minimum Bias Triggers at ATLAS, LHCDec 02 2008In the first phase of LHC data-taking ATLAS will measure the charged-particle density at the initial center-of-mass energy of 10 TeV and then at 14 TeV. This will allow us improve our knowledge of soft QCD models and pin-down cross-sections of different ... More

Supersymmetry searches at the TevatronJun 30 2004CDF and D0 collaborations analyzed up to 200 pb-1 of the delivered data in search for different supersymmetry signatures, so far with negative results. We present results on searches for chargino and neutralino associated production, squarks and gluinos, ... More

X-ray follow-up of extragalactic transientsMar 13 2019Most violent and energetic processes in our universe, including mergers of compact objects, explosions of massive stars and extreme accretion events, produce copious amounts of X-rays. X-ray follow-up is an efficient tool for identifying transients because ... More

Uniform Poincare inequalities for unbounded conservative spin systems: The non-interacting caseFeb 04 2002Mar 17 2003We prove a uniform Poincare' inequality for non-interacting unbounded spin systems with a conservation law, when the single-site potential is a bounded perturbation of a convex function. The result is then applied to Ginzburg-Landau processes to show ... More

Radiative Axion InflationFeb 07 2019Planck data robustly exclude the simple $\lambda\phi^4$ scenario for inflation. This is also the case for models of Axion Inflation in which the inflaton field is the radial part of the Peccei-Quinn complex scalar field. In this letter we show that for ... More

The Brauer-Kuroda formula for higher S-class numbers in dihedral extensions of number fieldsApr 17 2010Apr 20 2010Let p be an odd prime and let L/k be a Galois extension of number fields whose Galois group is isomorphic to the dihedral group of order 2p. Let S be a finite set of primes of L which is stable under the action of Gal(L/k). The Lichtenbaum conjecture ... More

Splitting in the K-theory localization sequence of number fieldsFeb 15 2010Feb 25 2010Let p be a rational prime and let F be a number field. Then, for each i>0, there is a short exact localization sequence for K_{2i}(F). If p is odd or F is nonexceptional, we find necessary and sufficient conditions for this exact sequence to split: these ... More

Decaying hadrons within constituent-quark modelsJun 19 2012Within conventional constituent-quark models hadrons come out as stable bound states of the valence (anti)quarks. Thereby the resonance character of hadronic excitations is completely ignored. A more realistic description of hadron spectra can be achieved ... More

Geometrical phases for the G(4,2) Grassmannian manifoldJan 24 2003Mar 13 2003We generalize the usual abelian Berry phase generated for example in a system with two non-degenerate states to the case of a system with two doubly degenerate energy eigenspaces. The parametric manifold describing the space of states of the first case ... More

Bootstrapping Lexical Choice via Multiple-Sequence AlignmentMay 25 2002An important component of any generation system is the mapping dictionary, a lexicon of elementary semantic expressions and corresponding natural language realizations. Typically, labor-intensive knowledge-based methods are used to construct the dictionary. ... More

Catching the Drift: Probabilistic Content Models, with Applications to Generation and SummarizationMay 12 2004We consider the problem of modeling the content structure of texts within a specific domain, in terms of the topics the texts address and the order in which these topics appear. We first present an effective knowledge-lean method for learning content ... More

New meteor showers identified in the CAMS and SonotaCo meteoroid orbit surveysMay 07 2014A cluster analysis was applied to the combined meteoroid orbit database derived from low-light level video observations by the SonotaCo consortium in Japan (64,650 meteors observed between 2007 and 2009) and by the Cameras for All-sky Meteor Surveillance ... More

A Note on Wetting Transition for Gradient FieldsSep 10 1999We prove existence of a wetting transition for two types of gradient fields: 1) Continuous SOS models in any dimension and 2) Massless Gaussian model in two dimensions. Combined with a recent result showing the absence of such a transition for Gaussian ... More

An explicit candidate for the set of Steinitz classes of tame Galois extensions with fixed Galois group of odd orderNov 08 2011Mar 04 2012Given a finite group G and a number field k, a well-known conjecture asserts that the set R_t(k,G) of Steinitz classes of tame G-Galois extensions of k is a subgroup of the ideal class group of k. In this paper we investigate an explicit candidate for ... More

Diffusivity in one-dimensional generalized Mott variable-range hopping modelsJan 09 2007Aug 31 2009We consider random walks in a random environment which are generalized versions of well-known effective models for Mott variable-range hopping. We study the homogenized diffusion constant of the random walk in the one-dimensional case. We prove various ... More

Global metallicity of globular cluster stars from colour-magnitude diagramsFeb 27 2002We have developed an homogeneous evolutionary scenario for H- and He-burning low-mass stars by computing updated stellar models for a wide metallicity and age range (0.0002$\le Z \le$0.004 and 9$\le t(Gyr) \le$15, respectively) suitable to study globular ... More

Asymmetric diffusion and the energy gap above the 111 ground state of the quantum XXZ modelJun 26 2001We consider the anisotropic three dimensional XXZ Heisenberg ferromagnet in a cylinder with axis along the 111 direction and boundary conditions that induce ground states describing an interface orthogonal to the cylinder axis. Let $L$ be the linear size ... More

Finite volume approximation of the effective diffusion matrix: The case of independent bond disorderOct 19 2001Consider uniformly elliptic random walk on $\bbZ^d$ with independent jump rates across nearest neighbour bonds of the lattice. We show that the infinite volume effective diffusion matrix can be almost surely recovered as the limit of finite volume periodized ... More

Time scales: from Nabla calculus to Delta calculus and vice versa via dualityOct 01 2009Jan 17 2010In this note we show how one can obtain results from the nabla calculus from results on the delta calculus and vice versa via a duality argument. We provide applications of the main results to the calculus of variations on time scales.

Isoperimetric inequalities and mixing time for a random walk on a random point processJul 31 2006Oct 31 2007We consider the random walk on a simple point process on $\Bbb{R}^d$, $d\geq2$, whose jump rates decay exponentially in the $\alpha$-power of jump length. The case $\alpha =1$ corresponds to the phonon-induced variable-range hopping in disordered solids ... More

Sensitivity Projections for Dark Matter Searches with the Fermi Large Area TelescopeMay 06 2016May 13 2016The nature of dark matter is a longstanding enigma of physics; it may consist of particles beyond the Standard Model that are still elusive to experiments. Among indirect search techniques, which look for stable products from the annihilation or decay ... More

Preliminary Results of the Fermi High-Latitude Extended Source CatalogSep 19 2017We report on preliminary results from the Fermi High-Latitude Extended Sources Catalog (FHES), a comprehensive search for spatially extended gamma-ray sources at high Galactic latitudes ($|b|>5^\circ$) based on data from the Fermi Large Area Telescope ... More

Phase ordering after a deep quench: the stochastic Ising and hard core gas models on a treeDec 22 2004Consider a low temperature stochastic Ising model in the phase coexistence regime with Markov semigroup $P_t$. A fundamental and still largely open problem is the understanding of the long time behavior of $\d_\h P_t$ when the initial configuration $\h$ ... More

Entropy dissipation estimates in a Zero-Range dynamicsMay 24 2004Sep 26 2006We study the exponential decay of relative entropy functionals for zero-range processes on the complete graph. For the standard model with rates increasing at infinity we prove entropy dissipation estimates, uniformly over the number of particles and ... More

On the splitting of the exact sequence relating the wild and tame kernelsMar 10 2013Let k be a number field. For an odd prime p and an integer i>1, the i-th \'etale wild kernel is contained in the second cohomology group of o'_k with coefficients in Zp(i), where o'_k is the ring of p-integers of k. Using Iwasawa theory, we give conditions ... More

Gauss sums, Jacobi sums and cyclotomic units related to torsion Galois modulesFeb 16 2014Let $G$ be a finite group and let $N/E$ be a tamely ramified $G$-Galois extension of number fields. We show how Stickelberger's factorization of Gauss sums can be used to determine the stable isomorphism class of various arithmetic $\mathbb{Z}[G]$-modules ... More

Entropy production in nonlinear recombination modelsSep 22 2016We study the convergence to equilibrium of a class of nonlinear recombination models. In analogy with Boltzmann's H theorem from kinetic theory, and in contrast with previous analysis of these models, convergence is measured in terms of relative entropy. ... More

A large deviation principle for Wigner matrices without Gaussian tailsJul 24 2012Oct 28 2014We consider $n\times n$ Hermitian matrices with i.i.d. entries $X_{ij}$ whose tail probabilities $\mathbb {P}(|X_{ij}|\geq t)$ behave like $e^{-at^{\alpha}}$ for some $a>0$ and $\alpha \in(0,2)$. We establish a large deviation principle for the empirical ... More

Leveraging over intact priors for boosting control and dexterity of prosthetic hands by amputeesAug 26 2016Non-invasive myoelectric prostheses require a long training time to obtain satisfactory control dexterity. These training times could possibly be reduced by leveraging over training efforts by previous subjects. So-called domain adaptation algorithms ... More

On fake Z_p extensions of number fieldsJul 07 2008May 10 2009After providing a general result for dihedral extensions, we study the growth of the $p$-part of the class group of the non-normal subfields of the anticyclotomic extension of an imaginary quadratic field, providing a formula of Iwasawa type. Furthermore, ... More

Relaxation time of anisotropic simple exclusion processes and quantum Heisenberg modelsFeb 04 2002Motivated by an exact mapping between anisotropic half integer spin quantum Heisenberg models and asymmetric diffusions on the lattice, we consider an anisotropic simple exclusion process with $N$ particles in a rectangle of $\bbZ^2$. Every particle at ... More

Multivariate spacings based on data depth: I. Construction of nonparametric multivariate tolerance regionsJun 18 2008This paper introduces and studies multivariate spacings. The spacings are developed using the order statistics derived from data depth. Specifically, the spacing between two consecutive order statistics is the region which bridges the two order statistics, ... More

Learning to Paraphrase: An Unsupervised Approach Using Multiple-Sequence AlignmentApr 02 2003We address the text-to-text generation problem of sentence-level paraphrasing -- a phenomenon distinct from and more difficult than word- or phrase-level paraphrasing. Our approach applies multiple-sequence alignment to sentences gathered from unannotated ... More

Automatic Aggregation by Joint Modeling of Aspects and ValuesJan 23 2014We present a model for aggregation of product review snippets by joint aspect identification and sentiment analysis. Our model simultaneously identifies an underlying set of ratable aspects presented in the reviews of a product (e.g., sushi and miso for ... More

Volume, diameter and the minimal mass of a stationary 1-cycleJan 28 2002Oct 21 2002In this paper we present upper bounds on the minimal mass of a non-trivial stationary 1-cycle. The results that we obtain are valid for all closed Riemannian manifolds. The first result is that the minimal mass of a stationary 1-cycle on a closed n-dimensional ... More

Monotone homotopies and contracting discs on Riemannian surfacesNov 13 2013Oct 05 2016We prove a "gluing" theorem for monotone homotopies; a monotone homotopy is a homotopy through simple contractible closed curves which themselves are pairwise disjoint. We show that two monotone homotopies which have appropriate overlap can be replaced ... More

Positron Annihilation in the GalaxyMar 13 2019The 511 keV line from positron annihilation in the Galaxy was the first $\gamma$-ray line detected to originate from outside our solar system. Going into the fifth decade since the discovery, the source of positrons is still unconfirmed and remains one ... More

Fermipy: An open-source Python package for analysis of Fermi-LAT DataJul 29 2017Fermipy is an open-source python framework that facilitates analysis of data collected by the Fermi Large Area Telescope (LAT). Fermipy is built on the Fermi Science Tools, the publicly available software suite provided by NASA for the LAT mission. Fermipy ... More

Dynamics of point Josephson junctions in a microstrip lineApr 03 2010We analyze a new long wave model describing the electrodynamics of an array of point Josephson junctions in a superconducting cavity. It consists in a wave equation with Dirac delta function sine nonlinearities. We introduce an adapted spectral problem ... More

Unidirectional Propagation of an Ultra-Short Electromagnetic Pulse in a Resonant Medium with High Frequency Stark ShiftJul 18 2001We consider in the unidirectional approximation the propagation of an ultra short electromagnetic pulse in a resonant medium consisting of molecules characterized by a transition operator with both diagonal and non-diagonal matrix elements. We find the ... More

Search for Gamma-ray Emission from Dark Matter Annihilation in the Small Magellanic Cloud with the Fermi Large Area TelescopeMar 03 2016Mar 29 2016The Small Magellanic Cloud (SMC) is the second-largest satellite galaxy of the Milky Way and is only 60 kpc away. As a nearby, massive, and dense object with relatively low astrophysical backgrounds, it is a natural target for dark matter indirect detection ... More

Dynamics of point Josephson junctions in a microstrip lineJan 27 2005We model the dynamics of point Josephson junctions in a 1D microstrip line using a wave equation with delta distributed sine nonlinearities. The model is suitable for both low T$_c$ and high T$_c$ systems (0 and $\pi$ junctions). For a single junction ... More

Statics of point Josephson junctions in a micro strip lineJul 11 2006We model the static behavior of point Josephson junctions in a micro strip line using a 1D linear differential equation with delta distributed sine non-linearities. We analyze the maximum current $\gamma_{max}$ crossing the micro strip for a given magnetic ... More

Influence of the passive region on Zero Field Steps for window Josephson junctionsMar 31 2002We present a numerical and analytic study of the influence of the passive region on fluxon dynamics in a window junction. We examine the effect of the extension of the passive region and its electromagnetic characteristics, its surface inductance and ... More

Reaction-diffusion front crossing a local defectJun 14 2011The interaction of a Zeldovich reaction-diffusion front with a localized defect is studied numerically and analytically. For the analysis, we start from conservation laws and develop simple collective variable ordinary differential equations for the front ... More

Discrete sine-Gordon dynamics on networksJun 08 2015In this study we consider the sine-Gordon equation formulated on domains which are not locally homeomorphic to any subset of the Euclidean space. More precisely, we formulate the discrete dynamics on trees and graphs. Each edge is assumed to be a 1D uniform ... More

Highly Degenerate Harmonic Mean Curvature FlowApr 24 2008We study the evolution of a weakly convex surface $\Sigma_0$ in $\R^3$ with flat sides by the Harmonic Mean Curvature flow. We establish the short time existence as well as the optimal regularity of the surface and we show that the boundaries of the flat ... More

Regularity for non-local almost minimal boundaries and applicationsMar 12 2010Jun 09 2011We introduce a notion of non-local almost minimal boundaries similar to that introduced by Almgren in geometric measure theory. Extending methods developed recently for non-local minimal surfaces we prove that flat non-local almost minimal boundaries ... More

Nonlinear waves in networks: a simple approach using the sine--Gordon equationFeb 26 2014To study the propagation of nonlinear waves across Y-- and T--type junctions, we consider the 2D sine--Gordon equation as a model and study the dynamics of kinks and breathers in such geometries. The comparison of the energies reveals that the angle of ... More

Domain Generalization with Domain-Specific Aggregation ModulesSep 28 2018Visual recognition systems are meant to work in the real world. For this to happen, they must work robustly in any visual domain, and not only on the data used during training. Within this context, a very realistic scenario deals with domain generalization, ... More

Synchronization in fiber lasers arraysApr 25 2013We consider an array of fiber lasers coupled through the nearest neighbors. The model is a generalized nonlinear Schroedinger equation where the usual Laplacian is replaced by the graph Laplacian. For a graph with no symmetries, we show that there is ... More

Global regularity of solutions to systems of reaction-diffusion with Sub-Quadratic Growth in any dimensionJan 28 2009This paper is devoted to the study of the regularity of solutions to some systems of reaction--diffusion equations, with reaction terms having a subquadratic growth. We show the global boundedness and regularity of solutions, without smallness assumptions, ... More

Designing arrays of Josephson junctions for specific static responsesMar 12 2007We consider the inverse problem of designing an array of superconducting Josephson junctions that has a given maximum static current pattern as function of the applied magnetic field. Such devices are used for magnetometry and as Terahertz oscillators. ... More

HB Morphology and Age Indicators for Metal-Poor Stellar Systems with Age in the Range of 1 to 20 GyrJul 20 1994Isochrone computations and horizontal branch (HB) models for Y(MS)=0.23 and two values of Z (0.0001, 0.0004)are used to derive constraints on the age indicators and HB morphology of metal-poor clusters with age t (in Gyrs) in the range of 1< t < 20.It ... More

A simple theory for the Raman spikeSep 11 2003The classical stimulated Raman scattering system describing resonant interaction between two electromagnetic waves and a fast relaxing medium wave is studied by introducting a systematic perturbation approach in powers of the relaxation time. We separate ... More

Contracting the boundary of a Riemannian 2-discMay 24 2012Dec 03 2014Let $D$ be a Riemannian 2-disc of area $A$, diameter $d$ and length of the boundary $L$. We prove that it is possible to contract the boundary of $D$ through curves of length $\leq L + 200d\max\{1,\ln {\sqrt{A}\over d} \}$. This answers a twenty-year ... More

Growth-Driven Percolations: The Dynamics of Community Formation in Neuronal SystemsNov 02 2004The quintessential property of neuronal systems is their intensive patterns of selective synaptic connections. The current work describes a physics-based approach to neuronal shape modeling and synthesis and its consideration for the simulation of neuronal ... More

Rationalizing Neural PredictionsJun 13 2016Prediction without justification has limited applicability. As a remedy, we learn to extract pieces of input text as justifications -- rationales -- that are tailored to be short and coherent, yet sufficient for making the same prediction. Our approach ... More

An Unsupervised Method for Uncovering Morphological ChainsMar 08 2015Most state-of-the-art systems today produce morphological analysis based only on orthographic patterns. In contrast, we propose a model for unsupervised morphological analysis that integrates orthographic and semantic views of words. We model word formation ... More

Reasoning for ALCQ extended with a flexible meta-modelling hierarchyOct 29 2014This works is motivated by a real-world case study where it is necessary to integrate and relate existing ontologies through meta- modelling. For this, we introduce the Description Logic ALCQM which is obtained from ALCQ by adding statements that equate ... More

STM-induced surface aggregates on metals and oxidized siliconAug 27 2012We have observed an aggregation of carbon or carbon derivatives on platinum and natively oxidized silicon surfaces during STM measurements in ultra-high vacuum on solvent-cleaned samples previously structured by e-beam lithography. We have imaged the ... More

How can the Odderon be detected at RHIC and LHCJul 08 2006Dec 21 2006The Odderon remains an elusive object, 33 years after its invention. The Odderon is now a fundamental object in QCD and CGC and it has to be found experimentally if QCD and CGC are right. In the present paper, we show how to find it at RHIC and LHC. The ... More

Modeling heterogeneity in ranked responses by nonparametric maximum likelihood: How do Europeans get their scientific knowledge?Jan 07 2011This paper is motivated by a Eurobarometer survey on science knowledge. As part of the survey, respondents were asked to rank sources of science information in order of importance. The official statistical analysis of these data however failed to use ... More

Supersymmetric variational energies for the confined Coulomb systemFeb 26 2002Jul 05 2002The methodology based on the association of the Variational Method with Supersymmetric Quantum Mechanics is used to evaluate the energy states of the confined hydrogen atom.

Ladder operators for subtle hidden shape invariant potentialsMay 03 2004Ladder operators can be constructed for all potentials that present the integrability condition known as shape invariance, satisfied by most of the exactly solvable potentials. Using the superalgebra of supersymmetric quantum mechanics we construct the ... More

Heralded orthogonalisation of coherent states and their conversion to discrete-variable superpositionsFeb 01 2017The nonorthogonality of coherent states is a fundamental property which prevents them from being perfectly and deterministically discriminated. To circumvent this problem, we present an experimentally feasible protocol for the probabilistic orthogonalisation ... More

HI Observations of the Ca II absorbing galaxies Mrk 1456 and SDSS J211701.26-002633.7Sep 30 2009In an effort to study Damped Lyman Alpha galaxies at low redshift, we have been using the Sloan Digital Sky Survey to identify galaxies projected onto QSO sightlines and to characterize their optical properties. For low redshift galaxies, the HI 21cm ... More

Monotone Operators without EnlargementsOct 14 2011Enlargements have proven to be useful tools for studying maximally monotone mappings. It is therefore natural to ask in which cases the enlargement does not change the original mapping. Svaiter has recently characterized non-enlargeable operators in reflexive ... More

A projection algorithm for non-monotone variational inequalitiesSep 30 2016We introduce and study the convergence properties of a projection-type algorithm for solving the variational inequality problem for point-to-set operators. No monotoni\-city assumption is used in our analysis. The operator defining the problem is only ... More

Spatially Resolved Emission of a High Redshift DLA Galaxy with the Keck/OSIRIS IFUOct 31 2013We present the first Keck/OSIRIS infrared IFU observations of a high redshift damped Lyman-alpha (DLA) galaxy detected in the line of sight to a background quasar. By utilizing the Laser Guide Star Adaptive Optics (LGSAO) to reduce the quasar PSF to FWHM~0.15 ... More

Rationalizing Neural PredictionsJun 13 2016Nov 02 2016Prediction without justification has limited applicability. As a remedy, we learn to extract pieces of input text as justifications -- rationales -- that are tailored to be short and coherent, yet sufficient for making the same prediction. Our approach ... More

Aspect-augmented Adversarial Networks for Domain AdaptationJan 01 2017Sep 25 2017We introduce a neural method for transfer learning between two (source and target) classification tasks or aspects over the same domain. Rather than training on target labels, we use a few keywords pertaining to source and target aspects indicating sentence ... More

The most metal-poor damped Lyman alpha systems: An insight into dwarf galaxies at high redshiftJun 26 2014Jul 31 2015In this paper we analyze the kinematics, chemistry, and physical properties of a sample of the most metal-poor damped Lyman-alpha systems (DLAs), to uncover their links to modern-day galaxies. We present evidence that the DLA population as a whole exhibits ... More

A new exactly solvable Eckart-type potentialApr 30 2001A new exact analytically solvable Eckart-type potential is presented, a generalisation of the Hulthen potential. The study through Supersymmetric Quantum Mechanics is presented together with the hierarchy of Hamiltonians and the shape invariance property. ... More

The stellar content of 10 dwarf irregular galaxiesSep 15 1998We examine the stellar content of 10 dwarf irregular galaxies of which broad-band CCD photometry was published in Hopp & Schulte-Ladbeck (1995). We also present Halpha images for several of these galaxies. The galaxies in the sample are located outside ... More

Cutting-Decimation Renormalization for diffusive and vibrational dynamics on fractalsOct 24 1997Recently, we pointed out that on a class on non exactly decimable fractals two different parameters are required to describe diffusive and vibrational dynamics. This phenomenon we call dynamical dimension splitting is related to the lack of exact decimation ... More

Hydrohalite Salt-albedo Feedback Could Cool M-dwarf PlanetsAug 29 2018A possible surface type that may form in the environments of M-dwarf planets is sodium chloride dihydrate, or "hydrohalite" (NaCl $\cdot$ 2H$_2$O), which can precipitate in bare sea ice at low temperatures. Unlike salt-free water ice, hydrohalite is highly ... More

The window Josephson junction: a coupled linear nonlinear systemJun 05 2001We investigate the interface coupling between the 2D sine-Gordon equation and the 2D wave equation in the context of a Josephson window junction using a finite volume numerical method and soliton perturbation theory. The geometry of the domain as well ... More

RR Lyrae stars in Galactic globular clusters.III. Pulsational predictions for metal content Z=0.0001 to Z=0.006May 21 2004The results of nonlinear, convective models of RR Lyrae pulsators with metal content Z=0.0001 to 0.006 are discussed and several predicted relations connecting pulsational (period and amplitude of pulsation) and evolutionary parameters (mass, absolute ... More

Theoretical models for classical cepheids: V. Multiwavelength relationsNov 23 1999From a theoretical study based on nonlinear, nonlocal and time-dependent convective pulsating models at varying mass and chemical composition, we present the predicted Period-Luminosity, Period-Color, Color-Color and Period-Luminosity-Color relations ... More

On the approach to equilibrium for a polymer with adsorption and repulsionSep 17 2007Feb 25 2008We consider paths of a one-dimensional simple random walk conditioned to come back to the origin after L steps (L an even integer). In the 'pinning model' each path \eta has a weight \lambda^{N(\eta)}, where \lambda>0 and N(\eta) is the number of zeros ... More

Spectrum of large random reversible Markov chains: two examplesNov 07 2008May 31 2010We take on a Random Matrix theory viewpoint to study the spectrum of certain reversible Markov chains in random environment. As the number of states tends to infinity, we consider the global behavior of the spectrum, and the local behavior at the edge, ... More

Circular Law Theorem for Random Markov MatricesAug 11 2008Jun 09 2010Consider an nxn random matrix X with i.i.d. nonnegative entries with bounded density, mean m, and finite positive variance sigma^2. Let M be the nxn random Markov matrix with i.i.d. rows obtained from X by dividing each row of X by its sum. In particular, ... More

Oscillations of simple networksSep 14 2011Oct 24 2012To describe the flow of a miscible quantity on a network, we introduce the graph wave equation where the standard continuous Laplacian is replaced by the graph Laplacian. This is a natural description of an array of inductances and capacities, of fluid ... More

Triple Scoring Using Paragraph Vector - The Gailan Triple Scorer at WSDM Cup 2017Dec 22 2017In this paper we describe our solution to the WSDM Cup 2017 Triple Scoring task. Our approach generates a relevance score based on the textual description of the triple's subject and value (Object). It measures how similar (related) the text description ... More

A Complete Method of Comparative Statics for Optimization Problems (Unabbreviated Version)Oct 27 2013A new method of deriving comparative statics information using generalized compensated derivatives is presented which yields constraint-free semidefiniteness results for any differentiable, constrained optimization problem. More generally, it applies ... More

Random walk on sparse random digraphsAug 26 2015Jan 22 2018A finite ergodic Markov chain exhibits cutoff if its distance to equilibrium remains close to its initial value over a certain number of iterations and then abruptly drops to near 0 on a much shorter time scale. Originally discovered in the context of ... More

Cosmic Rays and Interstellar Medium with Gamma-Ray Observations at MeV EnergiesMar 13 2019Latest precise cosmic-ray (CR) measurements and present gamma-ray observations have started challenging our understanding of CR transport and interaction in the Galaxy. Moreover, because the density of CRs is similar to the density of the magnetic field, ... More

Star luminosity function as an age indicator for the Dwarf spheroidal Leo IJul 23 1995Star luminosity function, already recognized as an age indicator for old galactic globular clusters, can be used to contrains the age of younger stellar systems like the nearby dwarfs spheroidal Leo I. We compare the observed luminosity function of Leo ... More

Coupling conditions for the nonlinear shallow water equations in forksSep 30 2015Oct 11 2016We study numerically and analytically how nonlinear shallow water waves propagate in a fork. Using a homothetic reduction procedure, conservation laws and numerical analysis in a 2D domain, we obtain simple angle dependent coupling conditions for the ... More

Nonlinear Analysis of Experimental Noisy Time Series in Fluidized Bed SystemsAug 02 1994The paper describes the application of some numerical techniques to analyze and to characterize the observed dynamical behaviour of fluidized bed systems. The preliminary results showed clearly that the dynamics of the considered process can be nonrecurrent ... More

Nonlinear energy transmission in the gapMar 09 2001Numerical simulations of the scattering of a linear plane wave incoming onto a nonlinear medium (sine-Gordon) reveals that: i) nonlinearity allows energy transmission in the forbidden band, ii) this nonlinear transmission occurs beyond an energy threshold ... More

Entropic repulsion in $|\nabla φ|^p$ surfaces: a large deviation bound for all $p\geq 1$Jan 12 2017We consider the $(2+1)$-dimensional generalized solid-on-solid (SOS) model, that is the random discrete surface with a gradient potential of the form $|\nabla\phi|^{p}$, where $p\in [1,+\infty]$. We show that at low temperature, for a square region $\Lambda$ ... More

Adaptive Learning to Speed-Up Control of Prosthetic Hands: a Few Things Everybody Should KnowFeb 27 2017A number of studies have proposed to use domain adaptation to reduce the training efforts needed to control an upper-limb prosthesis exploiting pre-trained models from prior subjects. These studies generally reported impressive reductions in the required ... More

Proof of Aldous' spectral gap conjectureJun 06 2009Sep 28 2009Aldous' spectral gap conjecture asserts that on any graph the random walk process and the random transposition (or interchange) process have the same spectral gap. We prove the conjecture using a recursive strategy. The approach is a natural extension ... More

Duality for the left and right fractional derivativesSep 18 2014We prove duality between the left and right fractional derivatives, independently on the type of fractional operator. Main result asserts that the right derivative of a function is the dual of the left derivative of the dual function or, equivalently, ... More

Radial sine-Gordon kinks as sources of fast breathersMar 18 2013We consider radial sine-Gordon kinks in two, three and higher dimensions. A full two dimensional simulation showing that azimuthal perturbations remain small allows to reduce the problem to the one dimensional radial sine-Gordon equation. We solve this ... More

RR Lyrae stars in Galactic globular clusters. VI. The Period-Amplitude relationSep 20 2007We compare theory and observations for fundamental RR Lyrae in the solar neighborhood and in both Oosterhoff type I (OoI) and type II (OoII) Galactic globular clusters (GGCs). The distribution of cluster RR_ab in the PA_V plane depends not only on the ... More

The Cepheid Period-Luminosity relation and the maser distance to NGC 4258Oct 24 2001In a recent paper describing HST observations of Cepheids in the spiral galaxy NGC 4258, Newman et al. (2001) report that the revised calibrations and methods for the Key Project on the Extragalactic Distance Scale yield that the true distance modulus ... More