Results for "Antonio A. Valido"

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Quantum dissipation of planar harmonic systems: Maxwell-Chern-Simons theoryOct 23 2018Jan 04 2019The conventional Brownian motion in harmonic systems has provided a deep understanding of a great diversity of dissipative phenomena. We address a rather fundamental microscopic description for the (linear) dissipative dynamics of two-dimensional harmonic ... More
Statistical physics of flux-carrying Brownian particlesMay 08 2019Chern-Simons gauge field theory has provided a natural framework to gain deep insight about many novel phenomena in two-dimensional condensed matter, and most recently, it was shown to render a substantially richer description for quantum dissipative ... More
Hierarchies of multipartite entanglement for continuous-variable statesSep 18 2014Oct 27 2014We derive a hierarchy of separability criteria for multi-mode continuous variable systems. They permit to study in a unified way the k-partite entanglement of broad classes of Gaussian and non- Gaussian states. With specific examples we demonstrate the ... More
Asymptotic Discord and Entanglement of Non-Resonant Harmonic Oscillators in an Equilibrium EnvironmentNov 03 2011Jan 19 2012In this work, we calculate the exact asymptotic quantum correlations between two interacting non-resonant harmonic oscillators in a common Ohmic bath. We derive \emph{analytical formulas} for the covariances, fully describing any Gaussian stationary state ... More
Approximating Vibronic Spectroscopy with Imperfect Quantum OpticsOct 24 2017Mar 07 2018We study the impact of experimental imperfections on a recently proposed protocol for performing quantum simulations of vibronic spectroscopy. Specifically, we propose a method for quantifying the impact of these imperfections, optimizing an experiment ... More
Tensor network states in time-bin quantum opticsDec 28 2017Jun 12 2018The current shift in the quantum optics community towards large-size experiments -- with many modes and photons -- necessitates new classical simulation techniques that go beyond the usual phase space formulation of quantum mechanics. To address this ... More
Gaussian entanglement induced by an extended thermal environmentJul 17 2013We study stationary entanglement among three harmonic oscillators which are dipole coupled to a one-dimensional or a three-dimensional bosonic environment. The analysis of the open-system dynamics is performed with generalized quantum Langevin equations ... More
Quantum correlations and energy currents across finite harmonic chainsMar 31 2015We present a study that addresses both the stationary properties of the energy current and quantum correlations in a three-mode chain subjected to Ohmic and super-Ohmic dissipa- tions. An extensive numerical analysis shows that the mean value and the ... More
Gaussian tripartite entanglement out of equilibriumMay 21 2013Jun 21 2013The stationary multipartite entanglement between three interacting harmonic oscillators subjected to decoherence is analyzed in the largely unexplored non-equilibrium strong dissipation regime. We compute the exact asymptotic Gaussian state of the system ... More
Review of strategies for a comprehensive simulation in sputtering devicesSep 12 2012The development of sputtering facilities, at the moment, is mainly pursued through experimental tests, or simply by expertise in the field, and relies much less on numerical simulation of the process environment. This leads to great efforts and empirically, ... More
Stability and Uniqueness of feasible equilibria for mass action law (MAL) kinetic systemsFeb 25 2015For a class of polynomial kinetic systems, this work examines connections between system parameters, and uniqueness and stability of the resulting equilibria. Such systems are typically employed to describe nonlinear dynamics in chemical reaction networks, ... More
Proper harmonic maps from hyperbolic Riemann surfaces into the Euclidean planeJun 15 2009Let $\Sigma$ be a compact Riemann surface and $D_1,...,D_n$ a finite number of pairwise disjoint closed disks of $\Sigma$. We prove the existence of a proper harmonic map into the Euclidean plane from a hyperbolic domain $\Omega$ containing $\Sigma\backslash\cup_{j=1}^n ... More
The dynamical nature of timeJun 22 2011Jul 23 2011It is usually assumed that the "$t$" parameter in the equations of dynamics can be identified with the indication of the pointer of a clock. Things are not so easy, however. In fact, since the equations of motion can be written in terms of $t$ but also ... More
K-trivials are NCRDec 09 2008We show that for every K-trivial real X, there is no representation of a continuous probability measure m such that X is 1-random relative to m.
Reliability of Erasure Coded Storage Systems: A Geometric ApproachSep 25 2014Aug 20 2015We consider the probability of data loss, or equivalently, the reliability function for an erasure coded distributed data storage system under worst case conditions. Data loss in an erasure coded system depends on probability distributions for the disk ... More
A Generalization of Montucla's Rectangle-to-Rectangle Dissection to Higher DimensionsJun 12 2015Dissections of polytopes are a well-studied subject by geometers as well as recreational mathematicians. A recent application in coding theory arises from the problem of parameterizing binary vectors of constant Hamming weight which has been shown previously ... More
Uniqueness of feasible equilibria for mass action law (MAL) kinetic systemsFeb 25 2015Nov 10 2016This paper studies the relations among system parameters, uniqueness, and stability of equilibria, for kinetic systems given in the form of polynomial ODEs. Such models are commonly used to describe the dynamics of nonnegative systems, with a wide range ... More
Relaxation properties in a lattice gas model with asymmetrical particlesJun 26 2001We study the relaxation process in a two-dimensional lattice gas model, where the interactions come from the excluded volume. In this model particles have three arms with an asymmetrical shape, which results in geometrical frustration that inhibits full ... More
Tensor network states in time-bin quantum opticsDec 28 2017The current shift in the quantum optics community towards large-size experiments -- with many modes and photons -- necessitates new classical simulation techniques that go beyond the usual phase space formulation of quantum mechanics. To address this ... More
High-resolution radio observations of nuclear and circumnuclear starbursts in Luminous Infrared GalaxiesApr 27 2008High-resolution radio observations of nearby starburst galaxies have shown that the distribution of their radio emission consists of a compact (<150 pc), high surface brightness, central radio source immersed in a low surface brightness circumnuclear ... More
Proton radius from electron-proton scattering and chiral perturbation theoryOct 31 2016We determine the root-mean-square proton charge radius, $R_{\rm p}$, from a fit to low-$Q^2$ electron-proton elastic scattering cross section data with the higher moments fixed (within uncertainties) to the values predicted by chiral perturbation theory. ... More
Review of recent results on heavy-ion physics and astroparticle physics in ALICE at the LHCSep 02 2016In this work we present a summary of the most relevant results on heavy-ion and astroparticle physics in ALICE. The summary includes a brief overview of the current status on the characterization of the hot and dense QCD medium created in the heavy-ion ... More
The space of solutions to the Hessian one equation in the finitely punctured planeNov 15 2004We construct the space of solutions to the elliptic Monge-Ampere equation det(D^2 u)=1 in the plane R^2 with n points removed. We show that, modulo equiaffine transformations and for n>1, this space can be seen as an open subset of R^{3n-4}, where the ... More
Collisions and regularization for the 3-vortex problemDec 09 2004We study the dynamics of 3 point-vortices on the plane for a fluid governed by Euler's equations, concentrating on the case when the moment of inertia is zero. We prove that the only motions that lead to total collisions are self-similar and that there ... More
Computing Maximal ChainsJan 20 2012In 1967 Wolk proved that every well partial order (wpo) has a maximal chain; that is a chain of maximal order type. (Note that all chains in a wpo are well-ordered.) We prove that such maximal chain cannot be found computably, not even hyperarithmetically: ... More
A Calabi's Type CorrespondenceJan 31 2019Calabi observed that there is a natural correspondence between the solutions of the minimal surface equation in $\mathbb{R}^3$ with those of the maximal spacelike surface equation in $\mathbb{L}^3$. We are going to show how this correspondence can be ... More
Synchronization of dynamical systems: an approach using a Computer Algebra SystemSep 14 2018The synchronization between two dynamical systems is one of the most appealing phenomena occurring in Nature. Already observed by Huygens in the case of two pendula, it is a current area of research in the case of chaotic systems, with numerous applications ... More
A time-dependent perturbative analysis for a quantum particle in a cloud chamberJul 31 2009We consider a simple model of a cloud chamber consisting of a test particle (the alpha-particle) interacting with two other particles (the atoms of the vapour) subject to attractive potentials centered in $a_1, a_2 \in \mathbb{R}^3$. At time zero the ... More
Characterizing the structure of protein-protein interaction networksSep 02 2016Sep 05 2016Network theorists have developed methods to characterize the complex interactions in natural phenomena. The structure of the network of interactions between proteins is important in the field of proteomics, and has been subject to intensive research in ... More
Proton radius from electron-proton scattering and chiral perturbation theoryOct 31 2016Nov 16 2016We determine the root-mean-square proton charge radius, $R_{\rm p}$, from a fit to low-$Q^2$ electron-proton elastic scattering cross section data with the higher moments fixed (within uncertainties) to the values predicted by chiral perturbation theory. ... More
The global geometry of surfaces with prescribed mean curvature in $\mathbb{R}^3$Feb 22 2018We develop a global theory for complete hypersurfaces in $\mathbb{R}^{n+1}$ whose mean curvature is given as a prescribed function of its Gauss map. This theory extends the usual one of constant mean curvature hypersurfaces in $\mathbb{R}^{n+1}$, and ... More
Effect of Priomordial non-Gaussianities on Galaxy Clusters Scaling RelationsMar 30 2016Galaxy clusters are a valuable source of cosmological information. Their formation and evolution depends on the underlying cosmology and on the statistical nature of the primordial density fluctuations. In this work we investigate the impact of primordial ... 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
Influence of Super-Horizon Scales on Cosmological Observables Generated during InflationNov 07 2003Nov 12 2003Using the techniques of out-of-equilibrium field theory, we study the influence on the properties of cosmological perturbations generated during inflation on observable scales coming from fluctuations corresponding today to scales much bigger than the ... More
Binary orbit, physical properties, and evolutionary state of Capella (alpha Aurigae)Jun 04 2009We report extensive radial-velocity measurements of the two giant components of the detached, 104-day period binary system of Capella. Our highly accurate three-dimensional orbital solution based on all existing spectroscopic and astrometric observations ... More
Simulations of Two-Dimensional Melting on the Surface of a SphereFeb 16 1998We have simulated a system of classical particles confined on the surface of a sphere interacting with a repulsive $r^{-12}$ potential. The same system simulated on a plane with periodic boundary conditions has van der Waals loops in pressure-density ... More
Non-Fermi Liquid Behavior in U and Ce Alloys: Criticality, Disorder, Dissipation, and Griffiths-McCoy singularitiesMar 06 2000In this paper we provide the theoretical basis for the problem of Griffiths-McCoy singularities close to the quantum critical point for magnetic ordering in U and Ce intermetallics. We show that the competition between Kondo effect and RKKY interaction ... More
Derivation of a four-spinor Dirac-like equation for the helium atom and an approximate ground state solutionOct 26 2013We present a new analysis of the connection between the classical conservation theorems and the role played by the Dirac matrices in order to obtain a four spinor version of the Dirac equation for the two electrons bound problem. The separation of the ... 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
Self-consistent one-dimensional electron system on liquid helium suspended over a nanoscale dielectric substrateNov 02 2017Jun 13 2018For electrons above a superfluid helium film suspended on a specially designed dielectric substrate, $z=h(y)$, we obtain that both the transverse, along $z$, and the lateral, along $y$, quantizations are strongly enhanced due to a strong mutual coupling. ... More
The global geometry of surfaces with prescribed mean curvature in $\mathbb{R}^3$Feb 22 2018Feb 25 2019We develop a global theory for complete hypersurfaces in $\mathbb{R}^{n+1}$ whose mean curvature is given as a prescribed function of its Gauss map. This theory extends the usual one of constant mean curvature hypersurfaces in $\mathbb{R}^{n+1}$, and ... More
Accurate Evaluation of Fermi-Dirac Integrals and Their Derivatives for Arbitrary Degeneracy and RelativitySep 25 1995The equation of state of an ideal Fermi gas is expressed in terms of Fermi-Dirac integrals. We give formulae for evaluation the Fermi-Dirac integrals of orders 1/2, 3/2, and 5/2 and their derivatives in various limits of non- and extreme degeneracy and ... More
Algebraic Bethe Ansatz for deformed Gaudin modelFeb 26 2010Mar 04 2011The Gaudin model based on the sl_2-invariant r-matrix with an extra Jordanian term depending on the spectral parameters is considered. The appropriate creation operators defining the Bethe states of the system are constructed through a recurrence relation. ... More
Homotopically Invisible Singular CurvesMar 29 2016Given a smooth manifold $M$ and a totally nonholonomic distribution $\Delta\subset TM$ of rank $d$, we study the effect of singular curves on the topology of the space of horizontal paths joining two points on $M$. Singular curves are critical points ... More
Superconductivity in intercalated group-IV honeycomb structuresNov 18 2014Jan 25 2015We present a theoretical investigation on electron-phonon superconductivity of honeycomb MX$_2$ layered structures. Where X is one element of the group-IV (C, Si or Ge) and M an alkali or an alkaline-earth metal. Among the studied composition we predict ... More
Geometric Realizations of TricategoriesMar 16 2012Jun 27 2012Any tricategory characteristically has associated various simplicial or pseudo-simplicial objects. This paper explores the relationship amongst three of them: the pseudo-simplicial bicategory so-called Grothendieck nerve of the tricategory, the simplicial ... More
Boltzmann's Concept of RealityJan 27 2007In this article we describe and analyze the concept of reality developed by the Austrian theoretical physicist Ludwig Boltzmann. It is our thesis that Boltzmann was fully aware that reality could, and actually was, described by different points of view. ... More
Dogmatism and Theoretical Pluralism in Modern CosmologyJun 08 1998This work discusses the presence of a dogmatic tendency within modern cosmology, and some ideas capable of neutralizing its negative influence. It is verified that warnings about the dangers of dogmatic thinking in cosmology can be found as early as the ... More
The MESS of cosmological perturbationsJun 05 2018Aug 13 2018We introduce two new effective quantities for the study of comoving curvature perturbations $\zeta$: the space dependent effective sound speed (SESS) and the momentum dependent effective sound speed (MESS) . We use the SESS and the MESS to derive a new ... More
The continuum radio emission from the Sy 1.5 galaxy NGC 5033May 07 2007We present new continuum VLA observations of the nearby Sy 1.5 galaxy NGC 5033, made at 4.9 and 8.4 GHz on 8 April 2003. Combined with VLA archival observations at 1.4 and 4.9 GHz made on 7 August 1993, 29 August 1999, and 31 October 1999, we sample the ... 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
Formation of singularities for a transport equation with nonlocal velocityJun 13 2007We study a 1D transport equation with nonlocal velocity and show the formation of singularities in finite time for a generic family of initial data. By adding a diffusion term the finite time singularity is prevented and the solutions exist globally in ... More
Disformal scalars as dark matter candidates: Branon phenomenologyFeb 23 2016Scalar particles coupled to the Standard Model fields through a disformal coupling arise in different theories, such as massive gravity or brane-world models. We will review the main phenomenology associated with such particles. Distinctive disformal ... More
On the connectedness of the set of Riemann surfaces with real moduliOct 12 2017Nov 10 2017The moduli space ${\mathcal{M}}_{g}$, of genus $g\geq2$ closed Riemann surfaces, is a complex orbifold of dimension $3(g-1)$ which carries a natural real structure i.e. it admits an anti-holomorphic involution $\sigma$. The involution $\sigma$ maps each ... More
Collisions of Four Point Vortices in the PlaneSep 07 2006This paper addresses the question of existence of (not necessarily self-similar) solutions to the 4-vortex problem that lead to total or partial collision. We begin by showing that energy considerations alone imply that, for the general $N$-vortex problem, ... More
Rotational hypersurfaces of prescribed mean curvatureFeb 25 2019We use a phase space analysis to give some classification results for rotational hypersurfaces in $\mathbb{R}^{n+1}$ whose mean curvature is given as a prescribed function of its Gauss map. For the case where the prescribed function is an even function ... More
Pros & Cons of Model-based Bandwidth Control for Client-assisted Content DeliverySep 25 2012A key challenge in \cacd\ is determining how to allocate limited server bandwidth across a large number of files being concurrently served so as to optimize global performance and cost objectives. In this paper, we present a comprehensive experimental ... More
General structure of the solutions of the Hamiltonian constraints of gravitySep 06 2007Oct 22 2008A general framework for the solutions of the constraints of pure gravity is constructed. It provides with well defined mathematical criteria to classify their solutions in four classes. Complete families of solutions are obtained in some cases. A starting ... More
On Mach's principle: Inertia as gravitationMar 28 2007In order to test the validity of Mach's principle, we calculate the action of the entire universe on a test mass in its rest frame, which is an acceleration ${\bf g}^*$. We show the dependence of the inertia principle on the lapse and the shift. Using ... More
A possible route to grow a (Mn:Si(1-x)Gex)-based diluted magnetic semiconductorOct 31 2003We systematically investigate, using ab initio density-functional theory calculations, the properties of interstitial and substitutional Mn in both Si and Ge, as well as in the Si(1-x)Gex alloy. We show that volume effects are not the main reason Mn prefers ... More
Large Mpemba-like effect in a gas of inelastic rough hard spheresFeb 25 2019Jun 11 2019We report the emergence of a giant Mpemba effect in the uniformly heated gas of inelastic rough hard spheres: The initially hotter sample may cool sooner than the colder one, even when the initial temperatures differ by more than one order of magnitude. ... More
Mining Cellular Automata DataBases throug PCA ModelsNov 14 2005Cellular Automata are discrete dynamical systems that evolve following simple and local rules. Despite of its local simplicity, knowledge discovery in CA is a NP problem. This is the main motivation for using data mining techniques for CA study. The Principal ... More
Finite Axisymmetric Charged Dust Disks Sources for Conformastatic SpacetimesJun 04 2009An infinite family of finite axisymmetric charged dust disks is presented. The disks are obtained by solving the Einstein-Maxwell equations for conformastatic spacetimes by assuming a functional dependency between the time-like component of the electromagnetic ... More
New Developments in Extra-dimensional Dark MatterDec 22 2005We summarize the main features of several dark matter candidates in extra-dimensional theories. In particular, we review Kaluza-Klein (KK) gravitons in universal extra dimensions and branons in brane-world models. KK gravitons are superWIMP (superweakly-interacting ... More
Bounded Confidence under Preferential Flip: A Coupled Dynamics of Structural Balance and OpinionsOct 09 2016In this work we study the coupled dynamics of social balance and opinion formation. We propose a model where agents form opinions under bounded confidence, but only considering the opinions of their friends. The signs of social ties -friendships and enmities- ... More
A classification of HII regions based on Oxygen and Helium lines: The cases of TOL2146-391 and TOL0357-3915Apr 20 2012We present long slit spectrophotometry of two HII regions: TOL2146-391 and TOL0357-3915. We performed a detailed analysis that involves abundance determinations relaxing the assumption of homogeneous temperature. The temperature inhomogeneities values, ... More
Schrodinger Equation with Moving Point Interactions in Three DimensionsAug 06 1999We consider the motion of a non relativistic quantum particle in R^3 subject to n point interactions which are moving on given smooth trajectories. Due to the singular character of the time-dependent interaction, the corresponding Schrodinger equation ... More
A Tutorial on the Optimization of Amplify-and-Forward MIMO Relay SystemsMar 12 2013The remarkable promise of multiple-input multiple-output (MIMO) wireless channels has motivated an intense research activity to characterize the theoretical and practical issues associated with the design of transmit (source) and receive (destination) ... More
Interfaces between buckling phases in Silicene: Ab initio density functional theory calculationsDec 11 2013The buckled structure of silicene leads to the possibility of new kinds of line defects that separate regions with reversed buckled phases. In the present work we show that these new grain boundaries have very low formation energies, one order of magnitude ... More
Bipartitioning of directed and mixed random graphsJan 27 2019We show that an intricate relation of cluster properties and optimal bipartitions, which takes place in undirected random graphs, extends to directed and mixed random graphs. In particular, the satisfability threshold coincides with the relative size ... More
Random Access in Uplink Massive MIMO Systems: How to exploit asynchronicity and excess antennasMay 03 2016Massive MIMO systems, where the base stations are equipped with hundreds of antennas, are an attractive way to handle the rapid growth of data traffic. As the number of users increases, the initial access and handover in contemporary networks will be ... More
An impulsive dynamical systems framework for reset control systemsMay 28 2015Impulsive dynamical systems is a well-established area of dynamical systems theory, and it is used in this work to analyze several basic properties of reset control systems: existence and uniqueness of solutions, and continuous dependence on the initial ... More
Unbounded Contention Resolution in Multiple-Access ChannelsJul 01 2011A frequent problem in settings where a unique resource must be shared among users is how to resolve the contention that arises when all of them must use it, but the resource allows only for one user each time. The application of efficient solutions for ... More
Heterogeneous Multi-output Gaussian Process PredictionMay 19 2018Jan 02 2019We present a novel extension of multi-output Gaussian processes for handling heterogeneous outputs. We assume that each output has its own likelihood function and use a vector-valued Gaussian process prior to jointly model the parameters in all likelihoods ... More
Towards a quantum sampling theory: the case of finite groupsOct 27 2015Nyquist-Shannon sampling theorem, instrumental in classical telecommunication technologies, is extended to quantum systems supporting a unitary representation of a finite group $G$. Two main ideas from the classical theory having natural counterparts ... More
Indirect signals from braneworldsAug 02 2007It has been suggested that our universe could be a 3-dimensional brane where the SM fields live embedded in a D-dimensional space-time. In flexible raneworlds, in addition to the SM fields, new degrees of freedom appear on the brane associated to brane ... More
Bundling up carbon nanotubes through Wigner defectsOct 19 2004We show, using ab initio total energy density functional theory, that the so-called Wigner defects, an interstitial carbon atom right besides a vacancy, which are present in irradiated graphite can also exist in bundles of carbon nanotubes. Due to the ... More
Convex separable problems with linear and box constraintsMar 22 2014In this work, we focus on separable convex optimization problems with linear and box constraints and compute the solution in closed-form as a function of some Lagrange multipliers that can be easily computed in a finite number of iterations. This allows ... More
ExtensorsDec 16 2002In this paper we introduce a class of mathematical objects called \emph{extensors} and develop some aspects of their theory with considerable detail. We give special names to several particular but important cases of extensors. The \emph{extension,} \emph{adjoint} ... More
Knowledge-Based Biomedical Word Sense Disambiguation with Neural Concept Embeddings and Distant SupervisionOct 26 2016Dec 04 2016Biomedical word sense disambiguation (WSD) is an important intermediate task in many natural language processing applications such as named entity recognition, syntactic parsing, and relation extraction. In this paper, we employ knowledge-based approaches ... More
On the cosmology of massive gravityApr 01 2013Sep 11 2013We present a review of cosmological solutions in non-linear massive gravity, focusing on the stability of perturbations. Although homogeneous and isotropic solutions have been found, these are now known to suffer from either Higuchi ghost or a new non-linear ... More
Aron-Berner extensions of triple maps with application to the bidual of Jordan Banach triple systemsJan 07 2019By extending the notion of Arens regularity of bilinear mappings, we say that a bounded trilinear map on Banach spaces id Aron--Berner regular when all its six Aron-Berner extensions to the bidual spaces coincide. We give some results on the Aron-Berner ... More
Detecting phylogenetic relations out from sparse context treesApr 27 2008The goal of this paper is to study the similarity between sequences using a distance between the \emph{context} trees associated to the sequences. These trees are defined in the framework of \emph{Sparse Probabilistic Suffix Trees} (SPST), and can be ... More
Cosmic Rays from Heavy Dark Matter from the Galactic CenterOct 30 2013The gamma-ray fluxes observed by the High Energy Stereoscopic System (HESS) from the J1745-290 Galactic Center source is well fitted by the secondary photons coming from Dark Matter (DM) annihilation in particle-antiparticle standard model pairs over ... More
DANCE: A Framework for the Distributed Assessment of Network CentralitiesAug 04 2011Apr 17 2014The analysis of large-scale complex networks is a major challenge in the Big Data domain. Given the large-scale of the complex networks researchers commonly deal with nowadays, the use of localized information (i.e. restricted to a limited neighborhood ... More
Multi-round Master-Worker Computing: a Repeated Game ApproachAug 24 2015We consider a computing system where a master processor assigns tasks for execution to worker processors through the Internet. We model the workers decision of whether to comply (compute the task) or not (return a bogus result to save the computation ... More
Field evidence of social influence in the expression of political preferences: the case of secessionist flags in BarcelonaSep 26 2014Different models of social influence have explored the dynamics of social contagion, imitation, and diffusion of different types of traits, opinions, and conducts. However, few behavioral data indicating social influence dynamics have been obtained from ... More
Total-variation-based methods for gravitational wave denoisingSep 28 2014We describe new methods for denoising and detection of gravitational waves embedded in additive Gaussian noise. The methods are based on Total Variation denoising algorithms. These algorithms, which do not need any a priori information about the signals, ... More
Quarkonium suppression in heavy-ion collisions: an open quantum system approachDec 21 2016We address the evolution of heavy-quarkonium states in an expanding quark-gluon plasma by implementing effective field theory techniques in the framework of open quantum systems. In this setting we compute the nuclear modification factors for quarkonia ... More
Complete Surfaces with Ends of Non Positive CurvatureMay 05 2014In this paper we extend Efimov's Theorem by proving that any complete surface in $\mathbb{R}^3$ with Gauss curvature bounded above by a negative constant outside a compact set has finite total curvature, finite area and is properly immersed. Moreover, ... More
Heavy quarkonium suppression in a fireballNov 13 2017Apr 16 2018We perform a comprehensive study of the time evolution of heavy-quarkonium states in an expanding hot QCD medium by implementing effective field theory techniques in the framework of open quantum systems. The formalism incorporates quarkonium production ... More
The topology of the category of open and closed stringsNov 04 2004In this paper we study the topology of the cobordism category of open and closed strings. This is a 2-category in which the objects are compact one-manifolds whose boundary components are labeled by an indexing set (the set of "D-branes"), the 1-morphisms ... More
Jordan weak amenability and orthogonal forms on JB*-algebrasNov 11 2014We prove the existence of a linear isometric correspondence between the Banach space of all symmetric orthogonal forms on a JB$^*$-algebra $\mathcal{J}$ and the Banach space of all purely Jordan generalized derivations from $\mathcal{J}$ into $\mathcal{J}^*$. ... More
Knit product of finite groups and samplingJun 28 2018A finite sampling theory associated with a unitary representation of a finite non Abelian group $\mathbf{G}$ on a Hilbert space is stablished. The non Abelian group $\mathbf{G}$ is a knit product $\mathbf{N}\bowtie \mathbf{H}$ of two finite subgroups ... More
Symmetries and selection rules in the measurement of the phonon spectrum of graphene and related materialsMay 06 2014Jan 14 2015When the phonon spectrum of a material is measured in a scattering experiment, selection rules preclude the observation of phonons that are odd under reflection by the scattering plane. Understanding these rules is crucial to correctly interpret experiments ... More
Bipartitioning of directed and mixed random graphsJan 27 2019Jun 18 2019We show that an intricate relation of cluster properties and optimal bipartitions, which takes place in undirected random graphs, extends to directed and mixed random graphs. In particular, the satisfability threshold coincides with the relative size ... More
Causal variance decompositions for institutional comparisons in healthcareFeb 20 2019There is increasing interest in comparing institutions delivering healthcare in terms of disease-specific quality indicators (QIs) that capture processes or outcomes showing variations in the care provided. Such comparisons can be framed in terms of causal ... More
On the signatures of flare-induced global waves in the Sun: GOLF and VIRGO observationsOct 17 2017Recently, several efforts have been made to identify the seismic signatures of flares and magnetic activity in the Sun and Sun-like stars. In this work, we have analyzed the disk-integrated velocity and intensity observations of the Sun obtained from ... More
A qualitative and numerical study or the matter-radiation interaction in Kantowski-Sachs cosmologiesOct 03 2002We examine, from both a qualitative and a numerical point of view, the evolution of Kantowski--Sachs cosmological models whose source is a mixture of a gas of weakly interacting massive particles (WIMP's) and a radiative gas made up of a ``tightly coupled'' ... More
Finite axisymmetric charged dust disks in conformastatic spacetimesJun 26 2008An infinite family of axisymmetric charged dust disks of finite extension is presented. The disks are obtained by solving the vacuum Einstein-Maxwell equations for conformastatic spacetimes, which are characterized by only one metric function. In order ... More