Results for "Antonio C. Bruno"

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Bayesian nonparametric location-scale-shape mixturesNov 29 2013Discrete mixture models are one of the most successful approaches for density estimation. Under a Bayesian nonparametric framework, Dirichlet process location-scale mixture of Gaussian kernels is the golden standard, both having nice theoretical properties ... More
Informative Bayesian inference for the skew-normal distributionMay 14 2013Motivated by the analysis of the distribution of university grades, which is usually asymmetric, we discuss two informative priors for the shape parameter of the skew-normal distribution, showing that they lead to closed-form full-conditional posterior ... More
Deep Tree Transductions - A Short SurveyFeb 05 2019The paper surveys recent extensions of the Long-Short Term Memory networks to handle tree structures from the perspective of learning non-trivial forms of isomorph structured transductions. It provides a discussion of modern TreeLSTM models, showing the ... More
Text Summarization as Tree Transduction by Top-Down TreeLSTMSep 24 2018Extractive compression is a challenging natural language processing problem. This work contributes by formulating neural extractive compression as a parse tree transduction problem, rather than a sequence transduction task. Motivated by this, we introduce ... More
Detecting Permanent and Intermittent Purchase Hotspots via Computational StigmergyFeb 05 2019The analysis of credit card transactions allows gaining new insights into the spending occurrences and mobility behavior of large numbers of individuals at an unprecedented scale. However, unfolding such spatiotemporal patterns at a community level implies ... More
Stigmergy-based modeling to discover urban activity patterns from positioning dataApr 12 2017Jan 21 2019Positioning data offer a remarkable source of information to analyze crowds urban dynamics. However, discovering urban activity patterns from the emergent behavior of crowds involves complex system modeling. An alternative approach is to adopt computational ... More
Assessing Refugees' Integration via Spatio-temporal Similarities of Mobility and Calling BehaviorsJul 16 2019In Turkey the increasing tension, due to the presence of 3.4 million Syrian refugees, demands the formulation of effective integration policies. Moreover, their design requires tools aimed at understanding the integration of refugees despite the complexity ... More
Initial-data contribution to the error budget of gravitational waves from neutron-star binariesMay 23 2016As numerical calculations of inspiralling neutron-star binaries reach values of accuracy that are comparable with those of binary black holes, a fine budgeting of the various sources of error becomes increasingly important. Among such sources, the initial ... More
Crystal growth as an excitable mediumJul 17 2012Crystal growth has been widely studied for many years, and, since the pioneering work of Burton, Cabrera and Frank, spirals and target patterns on the crystal surface have been understood as forms of tangential crystal growth mediated by defects and by ... More
A stigmergy-based analysis of city hotspots to discover trends and anomalies in urban transportation usageApr 16 2018Jan 21 2019A key aspect of a sustainable urban transportation system is the effectiveness of transportation policies. To be effective, a policy has to consider a broad range of elements, such as pollution emission, traffic flow, and human mobility. Due to the complexity ... More
Local Charge distributions in Metallic Alloys: a Local Field Coherent Potential Approximation TheoryDec 17 2002Electronic structure calculations performed on very large supercells have shown that the local charge excesses in metallic alloys are related through simple linear relations to the local electrostatic field resulting from distribution of charges in the ... More
Ground States for Diffusion Dominated Free Energies with Logarithmic InteractionJan 04 2014Aug 01 2014Replacing linear diffusion by a degenerate diffusion of porous medium type is known to regularize the classical two-dimensional parabolic-elliptic Keller-Segel model. The implications of nonlinear diffusion are that solutions exist globally and are uniformly ... More
Local Charge Excesses in Metallic Alloys: a Local Field Coherent Potential Approximation TheoryJun 06 2002Nov 27 2002Electronic structure calculations performed on very large supercells have shown that the local charge excesses in metallic alloys are related through simple linear relations to the local electrostatic field resulting from distribution of charges in the ... More
Marginal and Irrelevant Disorder in Einstein-Maxwell backgroundsDec 01 2015Jan 15 2016We study analytically the effect of a weak random chemical potential of zero average in an Einstein-Maxwell background. For uncorrelated disorder this perturbation is relevant however we show that it can become marginal or even irrelevant by tuning disorder ... More
Modelling the Influence of Cultural Information on Vision-Based Human Home Activity RecognitionMar 21 2018Daily life activities, such as eating and sleeping, are deeply influenced by a person's culture, hence generating differences in the way a same activity is performed by individuals belonging to different cultures. We argue that taking cultural information ... More
Understanding and enhancing superconductivity in FeSe/STO by quantum size effectsJun 30 2016Nov 24 2016Superconductivity in one-atom-layer iron selenide (FeSe) on a strontium titanate (STO) substrate is enhanced by almost an order of magnitude with respect to bulk FeSe. There is recent experimental evidence suggesting that this enhancement persists in ... More
Understanding and enhancing superconductivity in FeSe/STO by quantum size effectsJun 30 2016Superconductivity in one-atom-layer iron selenide (FeSe) on a strontium titanate (STO) substrate is enhanced by almost an order of magnitude with respect to bulk FeSe. There is recent experimental evidence suggesting that this enhancement persists in ... More
A Gain Function for Architectural Decision-Making in Scientific ComputingFeb 01 2016Scientific Computing typically requires large computational needs which have been addressed with High Performance Distributed Computing. It is essential to efficiently deploy a number of complex scientific applications, which have different characteristics, ... More
Rare Kaon Decays in the $1/N_c$-ExpansionSep 14 1992We study the unknown coupling constants that appear at order $p^4$ in the Chiral Perturbation Theory analysis of $K \to \pi \gamma^* \to \pi l^+ l^-$, $K^{+-} \to \pi^{+-} \gamma \gamma$ and $K \to \pi \pi \gamma$ decays. To that end, we compute the chiral ... More
Lensing Magnification and QSO-Galaxy Cross-Correlations: Observations, Theory and SimulationsOct 25 2005Oct 25 2005We review observations and gravitational lensing theory related to the magnification of background QSOs by intervening overdensities, and the induced cross-correlation between sources and foreground galaxies. We pay special attention to simulations, and ... More
Studying the LSS through weak gravitational lensing mapsDec 10 2001Weak gravitational lensing is a promising tool for the study of the mass distribution in the Universe. Here we report some partial results that show how lensing maps can be used to differentiate between cosmological models. We pay special attention to ... More
Cosmic Evolution Impressions on Lensing MapsApr 18 2003I investigate through simulations the redshift dependence of several lensing measures for two cosmological models, a flat universe with a cosmological constant (\LambdaCDM), and an open universe (OCDM). I argue that quintessence models can be seen as ... More
Versatile Hall magnetometer with variable sensitivity assembly for characterization of the magnetic properties of nanoparticlesMay 14 2019Jun 17 2019A Hall magnetometer with variable sensitivity is constructed to measure the magnetic properties of magnetic nanoparticles manufactured by different methods. This novel magnetometer can also be used to measure bulk materials and samples in liquids. The ... More
Versatile Hall magnetometer with variable sensitivity assembly for characterization of the magnetic properties of nanoparticlesMay 14 2019A Hall magnetometer with variable sensitivity is constructed to measure the magnetic properties of magnetic nanoparticles manufactured by different methods. This novel magnetometer can also be used to measure bulk materials and samples in liquids. The ... More
A framework for Culture-aware Robots based on Fuzzy LogicMar 22 2018Cultural adaptation, i.e., the matching of a robot's behaviours to the cultural norms and preferences of its user, is a well known key requirement for the success of any assistive application. However, culture-dependent robot behaviours are often implicitly ... More
Tunneling vortex dynamics in linearly coupled Bose-Hubbard ringsAug 04 2019The quantum dynamics of population-balanced fractional vortices and population-imbalanced vortices in an effective two-state bosonic system, made of two coupled discrete circuits with few sites, is addressed within the Bose-Hubbard model. % We show that ... More
On the cardinality of the $θ$-closed hull of setsMar 26 2012The \theta-closed hull of a set A in a topological space is the smallest set C containing A such that, whenever all $closed$ neighborhoods of a point intersect C, this point is in C. We define a new topological cardinal invariant function, the $\theta-bitighness ... More
Maximum a Posteriori State Path Estimation: Discretization Limits and their InterpretationMar 20 2014Continuous-discrete models with dynamics described by stochastic differential equations are used in a wide variety of applications. For these systems, the maximum a posteriori (MAP) state path can be defined as the curves around which lie the infinitesimal ... More
Thermal transistor effect in quantum systemsFeb 04 2019We study a quantum system composed of three interacting qubits, each coupled to a different thermal reservoir. We show how to engineer it in order to build a quantum device that is analogous to an electronic bipolar transistor. We outline how the interaction ... More
MPTCP Linux Kernel Congestion ControlsDec 07 2018MultiPath TCP (MPTCP) is a promising protocol which brings new light to the TCP/IP protocol stack ossification problem by means of an impactful innovation of the transport layer. A MPTCP connection consists of a set of one or more subflows, where each ... More
Transport in a gravity dual with a varying gravitational coupling constantJun 03 2016We study asymptotically AdS Brans-Dicke (BD) backgrounds, where the Ricci tensor R is coupled to a scalar in the radial dimension, as effective models of metals with a varying coupling constant. We show that, for translational invariant backgrounds, the ... More
Regularization of energy-momentum tensor correlators and parity-odd termsMar 11 2015Mar 18 2015We discuss the problem of regularizing correlators in conformal field theories. The only way to do it in coordinate space is to interpret them as distributions. Unfortunately except for the simplest cases we do not have tabulated mathematical results. ... More
A Hybrid multiphase model based on lattice Boltzmann method direct simulationsJun 11 2019By means of the multicomponent Shan-Chen lattice Boltzmann method (LBM), we investigate the multiphase flow through porous media. Despite the excellent accuracy of the LBM, large domains result in unaffordable computational expenses. The Hybrid model ... More
High Performance Computing Evaluation A methodology based on Scientific Application RequirementsDec 03 2014High Performance Distributed Computing is essential to boost scientific progress in many areas of science and to efficiently deploy a number of complex scientific applications. These applications have different characteristics that require distinct computational ... More
Extending an Information Extraction tool set to Central and Eastern European languagesSep 12 2006In a highly multilingual and multicultural environment such as in the European Commission with soon over twenty official languages, there is an urgent need for text analysis tools that use minimal linguistic knowledge so that they can be adapted to many ... More
On the cardinality of the $θ$-closed hull of sets IIJun 28 2012Dec 17 2012The research in this paper is a continuation of the investigation of the cardinality of the $\theta$-closed hull of subsets of spaces. This research obtains new upper bounds of the cardinality of the $\theta$-closed hull of subsets using cardinal functions ... More
The Affinity Effects of Parallelized Libraries in Concurrent EnvironmentsJan 28 2015The use of cloud computing grows as it appears to be an additional resource for High-Performance Parallel and Distributed Computing (HPDC), especially with respect to its use in support of scientific applications. Many studies have been devoted to determining ... More
Diagonalizations of dense familiesJul 17 2012Jul 29 2012We develop a unified framework for the study of properties involving diagonalizations of dense families in topological spaces. We provide complete classification of these properties. Our classification draws upon a large number of methods and constructions ... More
Transport in a gravity dual with a varying gravitational coupling constantJun 03 2016Jan 07 2017We study asymptotically AdS Brans-Dicke (BD) backgrounds, where the Ricci tensor R is coupled to a scalar in the radial dimension, as effective models of metals with a varying coupling constant. We show that, for translational invariant backgrounds, the ... More
Coherence effects in disordered geometries with a field-theory dualNov 29 2017Mar 26 2018We investigate the holographic dual of a probe scalar in an asymptotically Anti-de-Sitter (AdS) disordered background which is an exact solution of Einstein's equations in three bulk dimensions. Unlike other approaches to model disorder in holography, ... More
Dwarf Elliptical GalaxiesSep 28 1994Dwarf elliptical (dE) galaxies, with blue absolute magnitudes typically fainter than $M_B = -16$, are the most numerous type of galaxy in the nearby universe. Tremendous advances have been made over the past several years in delineating the properties ... More
Effect of Metallicity on the Evolution of the Habitable Zone from the Pre-Main Sequence to the Asymptotic Giant Branch and the Search for LifeApr 04 2013During the course of stellar evolution, the location and width of the habitable zone changes as the luminosity and radius of the star evolves. The duration of habitability for a planet located at a given distance from a star is greatly affected by the ... More
The invisible power of fairness. How machine learning shapes democracyMar 22 2019Many machine learning systems make extensive use of large amounts of data regarding human behaviors. Several researchers have found various discriminatory practices related to the use of human-related machine learning systems, for example in the field ... More
New method for characterization of magnetic nanoparticles by scanning magnetic microscopyJul 12 2019In this paper, we present a new method for the magnetic characterization of bulk materials, microstructures, and nanostructures. We investigated the magnetic and morphological properties of two colloidal dispersions of iron oxide (Fe3O4) magnetic nanoparticles ... More
Urban Swarms: A new approach for autonomous waste managementOct 18 2018Mar 01 2019Modern cities are growing ecosystems that face new challenges due to the increasing population demands. One of the many problems they face nowadays is waste management, which has become a pressing issue requiring new solutions. Swarm robotics systems ... More
Urban Swarms: A new approach for autonomous waste managementOct 18 2018Modern cities are growing ecosystems that face new challenges due to the increasing population demands. One of the many problems they face nowadays is waste management, which has become a pressing issue requiring new solutions. Swarm robotics systems ... More
Silicon Nitride MOMS Oscillator for Room Temperature Quantum OptomechanicsJun 29 2018Optomechanical SiN nano-oscillators in high-finesse Fabry-Perot cavities can be used to investigate the interaction between mechanical and optical degree of freedom for ultra-sensitive metrology and fundamental quantum mechanical studies. In this work ... More
Dixmier traces on noncompact isospectral deformationsJul 21 2005Apr 06 2006We extend the isospectral deformations of Connes, Landi and Dubois-Violette to the case of Riemannian spin manifolds carrying a proper action of the noncompact abelian group $R^l$. Under deformation by a torus action, a standard formula relates Dixmier ... More
Axelrod's Model with Surface TensionDec 12 2012In this work we propose a subtle change in Axelrod's model for the dissemination of culture. The mechanism consists of excluding non-interacting neighbours from the set of neighbours out of which an agent is drawn for potential cultural interactions. ... More
Full Speed Ahead: 3D Spatial Database Acceleration with GPUsAug 28 2018Many industries rely on visual insights to support decision- making processes in their businesses. In mining, the analysis of drills and geological shapes, represented as 3D geometries, is an important tool to assist geologists on the search for new ore ... More
Influence of nicotine and alcohol on sleep and implications on insomnia: the reward-attention circuit modelFeb 14 2019Dopamine, a neurotransmitter well known for regulating movement, reward, and learning, is emerging as one of the neuromodulators of wakefulness. Drugs that increase the level of dopamine in the brain (including, but not limited to, nicotine) also increase ... More
Short term period variable stars observed at OAUNIApr 03 2019We present the first scientific results of the program on short term period variable stars observed using the OAUNI facility at the peruvian Andes. These results include good quality light curves of delta Scuti stars, rapidly oscillating stars along with ... More
Induced extended calculus on the quantum planeJan 28 1994The non-commutative differential calculus on quantum groups can be extended by introducing, in analogy with the classical case, inner product operators and Lie derivatives. For the case of $\GL$ we show how this extended calculus induces by coaction a ... More
SBF Distances to Dwarf Elliptical Galaxies in the Sculptor GroupSep 04 1998As part of an ongoing search for dwarf elliptical galaxies (dE) in the vicinity of the Local Group, we acquired deep B and R-band images for five dE candidates identified in the Sculptor (Scl) group region. We carried out a surface brightness fluctuation ... More
Stiff-spring approximation revisited: inertial effects in non-equilibrium trajectoriesJul 25 2016Use of harmonic guiding potentials is the most common method for implementing steered molecular dynamics (SMD) simulations, performed to obtain potentials of mean force (PMFs) of molecular systems using non-equilibrium work (NEW) theorems. Harmonic guiding ... More
Collisional relaxation in the inhomogeneous Hamiltonian-Mean-Field model: diffusion coefficientsOct 21 2016Systems of particles with long range interactions present two important processes: first, the formation of out-of-equilibrium quasi-stationary states (QSS), and the collisional relaxation towards Maxwell-Boltzmann equilibrium in a much longer timescale. ... More
Can Life develop in the expanded habitable zones around Red Giant Stars?Mar 23 2005We present some new ideas about the possibility of life developing around sub-giant and red giant stars. Our study concerns the temporal evolution of the habitable zone. The distance between the star and the habitable zone, as well as its width, increases ... More
McMillan-Mayer Theory of Solutions Revisited: Simplifications and ExtensionsJun 05 2014Jun 18 2014McMillan and Mayer (MM) proved two remarkable theorems in their paper on the equilibrium statistical mechanics of liquid solutions. They first showed that the grand canonical partition function for a solution can be reduced to a one with an effectively ... More
Testing the Surface Brightness Fluctuations Method for Dwarf Elliptical Galaxies in the Centaurus A GroupDec 01 1999We have obtained deep B and R-band CCD photometry for 5 dE galaxies that were previously identified on Schmidt films covering the Cen A group region. From a Fourier analysis of the R-band CCD images we determined the surface brightness fluctuation (SBF) ... More
The minimal model for the Batalin-Vilkovisky operadMay 10 2011Jul 06 2011The purpose of this paper is to explain and to generalize, in a homotopical way, the result of Barannikov-Kontsevich and Manin which states that the underlying homology groups of some Batalin-Vilkovisky algebras carry a Frobenius manifold structure. To ... More
Collisional relaxation in the inhomogeneous Hamiltonian-Mean-Field model: diffusion coefficientsOct 21 2016Feb 06 2017Systems of particles with long range interactions present two important processes: first, the formation of out-of-equilibrium quasi-stationary states (QSS), and the collisional relaxation towards Maxwell-Boltzmann equilibrium in a much longer timescale. ... More
A complex network approach to cloud computingApr 10 2015Cloud computing has become an important means to speed up computing. One problem influencing heavily the performance of such systems is the choice of nodes as servers responsible for executing the users' tasks. In this article we report how complex networks ... More
Accelerating Algorithms using a Dataflow Graph in a Reconfigurable SystemOct 17 2011In this paper, the acceleration of algorithms using a design of a field programmable gate array (FPGA) as a prototype of a static dataflow architecture is discussed. The static dataflow architecture using operators interconnected by parallel buses was ... More
Apps, Places and People: strategies, limitations and trade-offs in the physical and digital worldsApr 19 2019Cognition has been found to constrain several aspects of human behaviour, such as the number of friends and the number of favourite places a person keeps stable over time. This limitation has been empirically defined in the physical and social spaces. ... More
Proof of concept for an ultrasensitive meta-device to detect and localize nonlinear elastic sourcesDec 25 2016The appearance of nonlinear effects in elastic wave propagation is one of the most reliable and sensitive indicators of the onset of material damage. However, these effects are usually very small and can be detected only using cumbersome digital signal ... More
Chaotic-Integrable Transition in the Sachdev-Ye-Kitaev ModelJul 07 2017Jun 18 2018Quantum chaos is one of the distinctive features of the Sachdev-Ye-Kitaev (SYK) model, $N$ Majorana fermions in $0+1$ dimensions with infinite-range two-body interactions, which is attracting a lot of interest as a toy model for holography. Here we show ... More
The FGK formalism for black p-branes in d dimensionsMar 01 2012Mar 14 2012We present a generalization to an arbitrary number of spacetime (d) and worldvolume (p+1) dimensions of the formalism proposed by Ferrara, Gibbons and Kallosh to study black holes (p=0) in d=4 dimensions. We include the special cases in which there can ... More
The scaling properties of exchange and correlation holes of the valence shell of second row atomsNov 30 2011Feb 01 2012We study the exchange and correlation hole of the valence shell of second row atoms using variational Monte Carlo techniques, especially correlated estimates, and norm-conserving pseudopotentials. The well-known scaling of the valence shell provides a ... More
Density profile, velocity anisotropy and line-of-sight external convergence of SLACS gravitational lensesApr 28 2009Jan 18 2011Data from 58 strong-lensing events surveyed by the Sloan Lens ACS Survey are used to estimate the projected galaxy mass inside their Einstein radii by two independent methods: stellar dynamics and strong gravitational lensing. We perform a joint analysis ... More
Bayesian analysis of joint strong gravitational lensing and dynamic galactic mass in SLACS: evidence of line-of-sight contaminationJun 21 2007We readdress the calculation of the mass of early-type galaxies using strong gravitational lensing and stellar dynamics. Our sample comprises 27 galaxies in the Sloan Lens ACS (SLACS) Survey. Comparing the mass estimates from these two independent methods ... More
Some interesting features of new massive gravityAug 03 2011A proof that new massive gravity - the massive 3D gravity model proposed by Bergshoeff, Hohm and Townsend (BHT) - is the only unitary system at the tree level that can be constructed by augmenting planar gravity through the curvature-squared terms, is ... More
Everyday the Same Picture: Popularity and Content DiversityJan 28 2015Feb 02 2015Facebook is flooded by diverse and heterogeneous content, from kittens up to music and news, passing through satirical and funny stories. Each piece of that corpus reflects the heterogeneity of the underlying social background. In the Italian Facebook ... More
Joint Maximum a Posteriori State Path and Parameter Estimation in Stochastic Differential EquationsApr 06 2017In this article, we introduce the joint maximum a posteriori state path and parameter estimator (JME) for continuous-time systems described by stochastic differential equations (SDEs). This estimator can be applied to nonlinear systems with discrete-time ... More
A Rational Approach to Cryptographic ProtocolsMay 01 2010This work initiates an analysis of several cryptographic protocols from a rational point of view using a game-theoretical approach, which allows us to represent not only the protocols but also possible misbehaviours of parties. Concretely, several concepts ... More
Linear maps between C*-algebras preserving extreme points and strongly linear preserversJul 21 2015We study new classes of linear preservers between C$^*$-algebras and JB$^*$-triples. Let $E$ and $F$ be JB$^*$-triples with $\partial_{e} (E_1)$. We prove that every linear map $T:E\to F$ strongly preserving Brown-Pedersen quasi-invertible elements is ... More
Essential spectrum of a class of Riemannian manifoldsMay 24 2012Jul 30 2012In this paper we consider a family of Riemannian manifolds, not necessarily complete, with curvature conditions in a neighborhood of a ray. Under these conditions we obtain that the essential spectrum of the Laplacian contains an interval. The results ... More
Chiral phase transition as an Anderson transition in the Instanton Liquid Model for QCDSep 24 2005We study the spectrum and eigenmodes of the QCD Dirac operator in a gauge background given by an Instanton Liquid Model (ILM) at temperatures around the chiral phase transition. For two massless quark flavors we observe that at the chiral phase transition, ... More
Global dynamics of a family of 3D Lotka-Volterra SystemsMar 19 2015In this paper we analyze the flow of a family of three dimensional Lotka-Volterra systems restricted to an invariant and bounded region. The behaviour of the flow in the interior of this region is simple: either every orbit is a periodic orbit or they ... More
Visualizing the large-$Z$ scaling of the kinetic energy density of atomsMay 25 2016The scaling of neutral atoms to large $Z$, combining periodicity with a gradual trend to homogeneity, is a fundamental probe of density functional theory, one that has driven recent advances in understanding both the kinetic and exchange-correlation energies. ... More
Newman-Janis Ansatz in conformastatic spacetimesJul 15 2016The Newman-Janis Ansatz was used first to obtain the stationary Kerr metric from the static Schwarzschild metric. Many works have been devoted to investigate the physical significance of this Ansatz, but no definite answer has been given so far. We show ... More
Relativistic static magnetized finite thin disk: An infinite family of exact solutionsJun 10 2010Dec 02 2011An infinite family of relativistic finite thin disk model with magnetic field is presented. The model is obtained for solving the Einstein-Maxwell equations for static spacetimes by means of the Horsk\'y-Mitskievitch generating conjecture. The vacuum ... More
Chiral phase transition and Anderson localization in the Instanton Liquid Model for QCDDec 20 2005We study the spectrum and eigenmodes of the QCD Dirac operator in a gauge background given by an Instanton Liquid Model (ILM) at temperatures around the chiral phase transition. Generically we find the Dirac eigenvectors become more localized as the temperature ... More
$C^3$ matching for asymptotically flat spacetimesJan 05 2019We propose a criterion for finding the minimum distance at which an interior solution of Einstein's equations can be matched with an exterior asymptotically flat solution. It is based upon the analysis of the eigenvalues of the Riemann curvature tensor ... More
L-functions of symmetric powers of the generalized Airy family of exponential sumsAug 02 2010This paper looks at the L-function of the k-th symmetric power of the ell-adic sheaf over the affine line associated to the generalized Airy family of exponential sums. We compute the degree of this rational function and the local factors at infinity. ... More
Model-based clustering via linear cluster-weighted modelsJun 18 2012Mar 09 2015A novel family of twelve mixture models with random covariates, nested in the linear $t$ cluster-weighted model (CWM), is introduced for model-based clustering. The linear $t$ CWM was recently presented as a robust alternative to the better known linear ... More
L-functions of symmetric powers of the generalized Airy family of exponential sums: ell-adic and p-adic methodsAug 09 2009Aug 02 2010For \psi a nontrivial additive character on the finite field F_q, the map t \mapsto \sum_{x \in F_q} \psi(f(x)+tx) is the Fourier transform of the map t \mapsto \psi(f(t))$. As is well-known, this has a cohomological interpretation, producing a continuous ... More
A model for periodic blazarsOct 15 2016We describe a scenario to explain blazar periodicities with timescales of $\sim$ few years. The scenario is based on a binary super-massive black hole (SMBH) system in which one of the two SMBH carries a jet. We discuss the various mechanisms that can ... More
Is the chiral phase transition induced by a metal-insulator transition?Nov 18 2007We investigate the QCD Dirac operator with gauge configurations given by a liquid of instantons in the region of temperatures about the chiral phase transition. Both the quenched and unquenched cases are examined in detail. We present evidence of a localization ... More
The QCD vacuum as a disordered medium: A simplified model for the QCD Dirac operatorDec 12 2003We model the QCD Dirac operator as a power-law random banded matrix (RBM) with the appropriate chiral symmetry. Our motivation is the form of the Dirac operator in a basis of instantonic zero modes with a corresponding gauge background of instantons. ... More
An infinite family of magnetized Morgan-Morgan relativistic thin disksNov 13 2010Dec 02 2011Applying the Horsk\'y-Mitskievitch conjecture to the empty space solutions of Morgan and Morgan due to the gravitational field of a finite disk, we have obtained the corresponding solutions of the Einstein-Maxwell equations. The resulting expressions ... More
Search of Complex Binary Cellular Automata Using Behavioral MetricsDec 06 2014Jan 16 2015We propose the characterization of binary cellular automata using a set of behavioral metrics that are applied to the minimal Boolean form of a cellular automaton's transition function. These behavioral metrics are formulated to satisfy heuristic criteria ... More
Laplacian-based generalized gradient approximations for the exchange energyAug 17 2013It is well known that in the gradient expansion approximation to density functional theory (DFT) the gradient and Laplacian of the density make interchangeable contributions to the exchange correlation (XC) energy. This is an arbitrary "gauge" freedom ... More
Counterrotating Dust Disk Around a Schwarzschild Black Hole: New Fully Integrated Explicit Exact SolutionNov 18 2008The first fully integrated explicit exact solution of the Einstein field equations corresponding to the superposition of a counterrotating dust disk with a central black hole is presented. The obtained solution represents an infinite annular thin disk ... More
Chiral phase transition in lattice QCD as a metal-insulator transitionNov 17 2006Mar 09 2007We investigate the lattice QCD Dirac operator with staggered fermions at temperatures around the chiral phase transition. We present evidence of a metal-insulator transition in the low lying modes of the Dirac operator around the same temperature as the ... More
Master Equation for a Particle Coupled to a Two-Level ReservoirSep 16 1994We study the quantum dissipative dynamics of a particle coupled linearly to a set of two-level systems (the heat bath) via the master equation method which we extract from the path integral formalism independently from the form of the bath spectral density. ... More
Beyond the local approximation to exchange and correlation: the role of the Laplacian of the density in the energy density of SiJun 18 2005We model the exchange-correlation (XC) energy density of the Si crystal and atom as calculated by variational Monte Carlo (VMC) methods with a gradient analysis beyond the local density approximation (LDA). We find the Laplacian of the density to be an ... More
Order-disorder transitions in a sheared many body systemJul 17 2015Dec 01 2015Motivated by experiments on sheared suspensions that show a transition between ordered and disordered phases, we here study the long-time behavior of a sheared and overdamped 2-d system of particles interacting by repulsive forces. As a function of interaction ... More
On the physical realizability of quantum stochastic walksMar 11 2016Quantum walks are a promising framework that can be used to both understand and implement quantum information processing tasks. The quantum stochastic walk is a recently developed framework that combines the concept of a quantum walk with that of a classical ... More
The core collapse supernova rate from 24 years of data of the Large Volume DetectorJan 24 2017The Large Volume Detector (LVD) at INFN Laboratori Nazionali del Gran Sasso, Italy is a 1 kt liquid scintillator neutrino observatory mainly designed to study low energy neutrinos from Gravi- tational Stellar Collapses (GSC) with 100% efficiency over ... More
Itinerant Nature of Atom-Magnetization Excitation by Tunneling ElectronsOct 06 2010Nov 04 2010We have performed single-atom magnetization curve (SAMC) measurements and inelastic scanning tunneling spectroscopy (ISTS) on individual Fe atoms on a Cu(111) surface. The SAMCs show a broad distribution of magnetic moments with $\unit[3.5]{\mu_{\rm B}}$ ... More