Results for "R. Caputo"

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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
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
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
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
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
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
Invariance principle for Mott variable range hopping and other walks on point processesDec 23 2009Mar 30 2010We consider a random walk on a homogeneous Poisson point process with energy marks. The jump rates decay exponentially in the A-power of the jump length and depend on the energy marks via a Boltzmann--like factor. The case A=1 corresponds to the phonon-induced ... More
Recognizing Objects In-the-wild: Where Do We Stand?Sep 18 2017May 22 2018The ability to recognize objects is an essential skill for a robotic system acting in human-populated environments. Despite decades of effort from the robotic and vision research communities, robots are still missing good visual perceptual systems, preventing ... More
A deep representation for depth images from synthetic dataSep 30 2016Convolutional Neural Networks (CNNs) trained on large scale RGB databases have become the secret sauce in the majority of recent approaches for object categorization from RGB-D data. Thanks to colorization techniques, these methods exploit the filters ... More
Recurrence and transience for long-range reversible random walks on a random point processNov 27 2008We consider reversible random walks in random environment obtained from symmetric long--range jump rates on a random point process. We prove almost sure transience and recurrence results under suitable assumptions on the point process and the jump rate ... More
Calorimeter-only analysis of the Fermi Large Area TelescopeMar 04 2015Above tens of GeV, gamma-ray observations with the Fermi Large Area Telescope (LAT) can be dominated by statistical uncertainties due to the low flux of sources and the limited acceptance. We are developing a new event class which can improve the acceptance: ... 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
Measurement-based VLC channel characterization for I2V communications in a real urban scenarioMay 13 2019Visible light communication (VLC) is nowadays envisaged as a promising technology to enable new classes of services in intelligent transportation systems ranging e.g. from assisted driving to autonomous vehicles. The assessment of the performance of VLC ... More
The RGB-D Triathlon: Towards Agile Visual Toolboxes for RobotsApr 01 2019Apr 02 2019Deep networks have brought significant advances in robot perception, enabling to improve the capabilities of robots in several visual tasks, ranging from object detection and recognition to pose estimation, semantic scene segmentation and many others. ... 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
On the spectral gap of the Kac walk and other binary collision processesJul 22 2008We give a new and elementary computation of the spectral gap of the Kac walk on the N-sphere. The result is obtained as a by-product of a more general observation which allows to reduce the analysis of the spectral gap of an N-component system to that ... 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
Three-dimensional Fermi surface of 2H-NbSe$_2$ - Implications for the mechanism of charge density wavesJul 23 2018We investigate the three-dimensional electronic structure of the seminal charge-density-wave (CDW) material 2H-NbSe$_2$ by soft x-ray angle-resolved photoelectron spectroscopy and density-functional theory. Our results reveal the pronounced 3D character ... More
Search for Gamma-Ray Lines towards Galaxy Clusters with the Fermi-LATOct 30 2015Feb 04 2016We report on a search for monochromatic $\gamma$-ray features in the spectra of galaxy clusters observed by the \emph{Fermi} Large Area Telescope. Galaxy clusters are the largest structures in the Universe that are bound by dark matter (DM), making them ... More
Linear nonadiabatic properties of SX Phoenicis variablesFeb 02 2001We present a detailed linear, nonadiabatic pulsational scenario for oscillating Blue Stragglers (BSs)/SX Phoenicis (SX Phe) in Galactic Globular Clusters (GGCs) and in Local Group (LG) dwarf galaxies. The sequences of models were constructed by adopting ... More
Controlling collapse in Bose-Einstein condensates by temporal modulation of the scattering lengthSep 09 2002We consider, by means of the variational approximation (VA) and direct numerical simulations of the Gross-Pitaevskii (GP) equation, the dynamics of 2D and 3D condensates with a scattering length containing constant and harmonically varying parts, which ... 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
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
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
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
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
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
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
Looking Beyond Appearances: Synthetic Training Data for Deep CNNs in Re-identificationJan 11 2017Nov 13 2018Re-identification is generally carried out by encoding the appearance of a subject in terms of outfit, suggesting scenarios where people do not change their attire. In this paper we overcome this restriction, by proposing a framework based on a deep convolutional ... More
Active Learning for Online Recognition of Human Activities from Streaming VideosApr 11 2016Recognising human activities from streaming videos poses unique challenges to learning algorithms: predictive models need to be scalable, incrementally trainable, and must remain bounded in size even when the data stream is arbitrarily long. Furthermore, ... More
Visual Cues to Improve Myoelectric Control of Upper Limb ProsthesesAug 29 2017The instability of myoelectric signals over time complicates their use to control highly articulated prostheses. To address this problem, studies have tried to combine surface electromyography with modalities that are less affected by the amputation and ... More
Boosting Domain Adaptation by Discovering Latent DomainsMay 03 2018Current Domain Adaptation (DA) methods based on deep architectures assume that the source samples arise from a single distribution. However, in practice, most datasets can be regarded as mixtures of multiple domains. In these cases exploiting single-source ... More
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
The shape of the $(2+1)$D SOS surface above a wallJul 16 2012We give a full description for the shape of the classical (2+1)\Dim Solid-On-Solid model above a wall, introduced by Temperley (1952). On an $L\times L$ box at a large inverse-temperature $\beta$ the height of most sites concentrates on a single level ... More
Constraints on millicharged dark matter and axion-like particles from timing of radio wavesFeb 07 2019Feb 14 2019We derive novel constraints on millicharged dark matter and ultralight axion-like particles using pulsar timing and fast radio burst observations. Millicharged dark matter affects the dispersion measure of the time of arrival of radio pulses in a way ... More
Large deviations of empirical neighborhood distribution in sparse random graphsAug 27 2013Apr 07 2016Consider the Erd\H{o}s-Renyi random graph on n vertices where each edge is present independently with probability c/n, with c>0 fixed. For large n, a typical random graph locally behaves like a Galton-Watson tree with Poisson offspring distribution with ... More
Convergence to equilibrium for a directed (1+d)-dimensional polymerApr 09 2015We consider a flip dynamics for directed (1+d)-dimensional lattice paths with length L. The model can be interpreted as a higher dimensional version of the simple exclusion process, the latter corresponding to the case d=1. We prove that the mixing time ... More
Mixing time of PageRank surfers on sparse random digraphsMay 13 2019Given a digraph $G$, a parameter $\alpha\in(0,1)$ and a distribution $\lambda$ over the vertices of $G$, the generalised PageRank surf on $G$ with parameters $\alpha$ and $\lambda$ is the Markov chain on the vertices of $G$ such that at each step with ... More
Domain Generalization by Solving Jigsaw PuzzlesMar 16 2019Apr 14 2019Human adaptability relies crucially on the ability to learn and merge knowledge both from supervised and unsupervised learning: the parents point out few important concepts, but then the children fill in the gaps on their own. This is particularly effective, ... More
Electron-hole balanced dynamics in the type-II Weyl semimetal candidate WTe2Nov 14 2017We present a time- and angular-resolved photoemission (TR-ARPES) study of the transition- metal dichalcogenide WTe2, a candidate type II Weyl semimetal exhibiting extremely large magne- toresistence. Using femtosecond light pulses, we characterize the ... 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
Towards Learning free Naive Bayes Nearest Neighbor-based Domain AdaptationMar 26 2015As of today, object categorization algorithms are not able to achieve the level of robustness and generality necessary to work reliably in the real world. Even the most powerful convolutional neural network we can train fails to perform satisfactorily ... 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.
Screening magnetic fields by a superconducting disk: a simple modelAug 09 2013We introduce a simple approach to evaluate the magnetic field distribution around superconducting samples, based on the London equations; the elementary variable is the vector potential. This procedure has no adjustable parameters, only the sample geometry ... 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
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
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
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
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
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
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
On the distance of the Magellanic Clouds using Cepheid NIR and optical-NIR Period Wesenheit RelationsDec 18 2012Jan 30 2013We present the largest near-infrared (NIR) data sets, $JHKs$, ever collected for classical Cepheids in the Magellanic Clouds (MCs). We selected fundamental (FU) and first overtone (FO) pulsators, and found 4150 (2571 FU, 1579 FO) Cepheids for Small Magellanic ... More
B, V, I photometry of the complete sample of 23 Cepheids in the field of NGC 1866Sep 28 2005We present the result of BVI photometry, obtained by using FORS@VLT, of the Cepheids present in the field of the Large Magellanic Cloud cluster NGC 1866. We found the 22 known variables plus an additional new Cepheid located about 10' from the cluster ... More
On the relative distance of Magellanic Clouds using Cepheid NlR and Optical-NIR PW relationsApr 07 2013We present new estimates of the relative distance of the Magellanic Clouds (MCs) by using NIR and Optical-NIR Cepheid Period Wesenheit (PW) relations. The relative distances are independent of uncertainties affecting the zero-point of the PW relations, ... More
New Baade-Wesselink distances and radii for four metal-rich Galactic CepheidsMar 19 2010We provided accurate estimates of distances, radii and iron abundances for four metal-rich Cepheids, namely V340 Ara, UZ Sct, AV Sgr and VY Sgr. The main aim of this investigation is to constrain their pulsation properties and their location across the ... 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
Spectrum of non-Hermitian heavy tailed random matricesJun 09 2010Oct 14 2011Let (X_{jk})_{j,k>=1} be i.i.d. complex random variables such that |X_{jk}| is in the domain of attraction of an alpha-stable law, with 0< alpha <2. Our main result is a heavy tailed counterpart of Girko's circular law. Namely, under some additional smoothness ... More
Random walk on sparse random digraphsAug 26 2015Sep 28 2015A 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
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
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
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
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
The Carina dSph galaxy: where is the edge?Sep 02 2005Recent cosmological N-body simulations suggest that current empirical estimates of tidal radii in dSphs might be underestimated by at least one order of magnitude. To constrain the plausibility of this theoretical framework, we undertook a multiband (U,B,V,I) ... More
Fast electromagnetic response of a thin film of resonant atoms with permanent dipoleJun 18 2009We consider the propagation of extremely short pulses through a dielectric thin film containing resonant atoms (two level atoms) with permanent dipole. Assuming that the film width is less than the field wave length, we can solve the wave equation and ... More
Updated pulsation models for anomalous CepheidsJan 16 2004A theoretical investigation of the pulsation behavior of so-named ``anomalous'' Cepheids is presented. The study is based on nonlinear convective pulsation models with $Z$=0.0001 and 0.0004, mass in the range 1.3-2.2 Mo and various luminosity levels. ... More
Cutoff at the "entropic time" for sparse Markov chainsNov 03 2016Jan 22 2018We study convergence to equilibrium for a large class of Markov chains in random environment. The chains are sparse in the sense that in every row of the transition matrix $P$ the mass is essentially concentrated on few entries. Moreover, the random environment ... More
Confinement of Brownian Polymers under Geometric Area TiltsSep 10 2018We consider tightness for families of non-colliding Brownian bridges above a hard wall, which are subject to geometrically growing self-potentials of tilted area type. The model is introduced in order to mimic level lines of $2+1$ discrete Solid-On-Solid ... More
Low-scale leptogenesis and dark matterJul 09 2018Jul 25 2018An extension of the Standard Model with Majorana singlet fermions in the 1-100 GeV range can give rise to a baryon asymmetry at freeze-in via the CP-violating oscillations of these neutrinos: this is the well known ARS mechanism. In this paper we consider ... More
Binary pulsars as probes of a Galactic dark matter diskSep 12 2017Nov 10 2017As a binary pulsar moves through a wind of dark matter particles, the resulting dynamical friction modifies the binary's orbit. We study this effect for the double disk dark matter (DDDM) scenario, where a fraction of the dark matter is dissipative and ... More
Adaptive Deep Learning through Visual Domain LocalizationFeb 24 2018A commercial robot, trained by its manufacturer to recognize a predefined number and type of objects, might be used in many settings, that will in general differ in their illumination conditions, background, type and degree of clutter, and so on. Recent ... More
Scalable Greedy Algorithms for Transfer LearningAug 06 2014Jun 18 2016In this paper we consider the binary transfer learning problem, focusing on how to select and combine sources from a large pool to yield a good performance on a target task. Constraining our scenario to real world, we do not assume the direct access to ... More
When Naïve Bayes Nearest Neighbours Meet Convolutional Neural NetworksNov 12 2015Nov 17 2015Since Convolutional Neural Networks (CNNs) have become the leading learning paradigm in visual recognition, Naive Bayes Nearest Neighbour (NBNN)-based classifiers have lost momentum in the community. This is because (1) such algorithms cannot use CNN ... More
On the probability of staying above a wall for the (2+1)-dimensional SOS model at low temperatureJun 04 2014Nov 09 2015We obtain sharp asymptotics for the probability that the (2+1)-dimensional discrete SOS interface at low temperature is positive in a large region. For a square region $\Lambda$, both under the infinite volume measure and under the measure with zero boundary ... More
Propagation of exremely short pulses in non-resonant media: the total Maxwell-Duffing modelSep 04 2003Propagation of extremely short pulses of electromagnetic field (electromagnetic spikes) is considered in the framework of the total Maxwell-Duffing model where anharmonic oscillators with cubic nonlinearities (Duffing model) represent the material medium ... More
Theoretical Models for Classical Cepheids: IV. Mean Magnitudes and Colors and the Evaluation of Distance, Reddening and MetallicityJun 03 1999We discuss the metallicity effect on the theoretical visual and near-infrared PL and PLC relations of classical Cepheids, as based on nonlinear, nonlocal and time--dependent convective pulsating models at varying chemical composition. In view of the two ... More
Mixing time of the adjacent walk on the simplexApr 01 2019By viewing the $N$-simplex as the set of positions of $N-1$ ordered particles on the unit interval, the adjacent walk is the continuous time Markov chain obtained by updating independently at rate 1 the position of each particle with a sample from the ... More
Class number formula for dihedral extensionsMar 11 2018We give an algebraic proof of a class number formula for dihedral extensions of number fields of degree $2q$, where $q$ is any odd integer. Our formula expresses the ratio of class numbers as a ratio of orders of cohomology groups of units and recovers ... More
On the evolution of convex hypersurfaces by the $Q_k$ flowApr 03 2009We prove the existence and uniqueness of a $C^{1,1}$ solution of the $Q_k$ flow in the viscosity sense for compact convex hypersurfaces $\Sigma_t$ embedded in $R^{n+1}$ ($n \geq 2$) . In particular, for compact convex hypersurfaces with flat sides we ... More
Class number formula for dihedral extensionsMar 11 2018May 08 2019We give an algebraic proof of a class number formula for dihedral extensions of number fields of degree $2q$, where $q$ is any odd integer. Our formula expresses the ratio of class numbers as a ratio of orders of cohomology groups of units and recovers ... More
Convergence to equilibrium of biased plane partitionsMar 29 2009Apr 12 2010We study a single-flip dynamics for the monotone surface in (2+1) dimensions obtained from a boxed plane partition. The surface is analyzed as a system of non-intersecting simple paths. When the flips have a non-zero bias we prove that there is a positive ... 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
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