Results for "Jose M. Such"

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Resolving Multi-party Privacy Conflicts in Social MediaJul 16 2015Feb 22 2016Items shared through Social Media may affect more than one user's privacy --- e.g., photos that depict multiple users, comments that mention multiple users, events in which multiple users are invited, etc. The lack of multi-party privacy management support ... More
Norm Monitoring under Partial Action ObservabilityMay 15 2015Apr 21 2016In the context of using norms for controlling multi-agent systems, a vitally important question that has not yet been addressed in the literature is the development of mechanisms for monitoring norm compliance under partial action observability. This ... More
Smart Home Personal Assistants: A Security and Privacy ReviewMar 13 2019Smart Home Personal Assistants (SPA) are an emerging innovation that is changing the way in which home users interact with the technology. However, there are a number of elements that expose these systems to various risks: i) the open nature of the voice ... More
Smart Home Personal Assistants: A Security and Privacy ReviewMar 13 2019Mar 17 2019Smart Home Personal Assistants (SPA) are an emerging innovation that is changing the way in which home users interact with the technology. However, there are a number of elements that expose these systems to various risks: i) the open nature of the voice ... More
The Security of Smart Buildings: a Systematic Literature ReviewJan 17 2019Jan 28 2019Smart Buildings are networks of connected devices and software in charge of automatically managing and controlling several building functions such as HVAC, fire alarms, lighting, shading and more. These systems evolved from mostly electronic and mechanical ... More
Implicit Contextual Integrity in Online Social NetworksFeb 09 2015Jul 06 2015Many real incidents demonstrate that users of Online Social Networks need mechanisms that help them manage their interactions by increasing the awareness of the different contexts that coexist in Online Social Networks and preventing them from exchanging ... More
Phoneme discrimination using neurons with symmetric nonlinear response over a spectral rangeNov 04 2013We consider the ability of a very simple feed-forward neural network to discriminate phonemes based on just relative power spectrum. The network consists of two neurons with symmetric nonlinear response over a spectral range. The output of the neurons ... More
Some geometric aspects of Puiseux surfacesMar 21 2007The following problem is treated: Characterizing the tangent cone and the equimultiple locus of a Puiseux surface (that is, an algebroid embedded surface admitting an equation whose roots are Puiseux power series), using a set of exponents appearing in ... More
A Rational Indicator of Scientific CreativityAug 01 2006A model is proposed for the creation and transmission of scientific knowledge, based on the network of citations among research articles. The model allows to assign to each article a nonnegative value for its creativity, i. e. its creation of new knowledge. ... More
Unifying Gaussian LWF and AMP Chain Graphs to Model InterferenceNov 11 2018Apr 01 2019An intervention may have an effect on units other than those to which it was administered. This phenomenon is called interference and it usually goes unmodeled. In this paper, we propose to combine Lauritzen-Wermuth-Frydenberg and Andersson-Madigan-Perlman ... More
Alternative Markov and Causal Properties for Acyclic Directed Mixed GraphsNov 18 2015Feb 19 2016We extend Andersson-Madigan-Perlman chain graphs by (i) relaxing the semidirected acyclity constraint so that only directed cycles are forbidden, and (ii) allowing up to two edges between any pair of nodes. We introduce global, and ordered local and pairwise ... More
Learning AMP Chain Graphs and some Marginal Models Thereof under Faithfulness: Extended VersionMar 04 2013Jan 17 2014This paper deals with chain graphs under the Andersson-Madigan-Perlman (AMP) interpretation. In particular, we present a constraint based algorithm for learning an AMP chain graph a given probability distribution is faithful to. Moreover, we show that ... More
Reading Dependencies from Polytree-Like Bayesian NetworksJun 20 2012We present a graphical criterion for reading dependencies from the minimal directed independence map G of a graphoid p when G is a polytree and p satisfies composition and weak transitivity. We prove that the criterion is sound and complete. We argue ... More
Winning the Big Data Technologies Horizon Prize: Fast and reliable forecasting of electricity grid traffic by identification of recurrent fluctuationsFeb 12 2019This paper provides a description of the approach and methodology I used in winning the European Union Big Data Technologies Horizon Prize on data-driven prediction of electricity grid traffic. The methodology relies on identifying typical short-term ... More
Hilbert C*-modules are JB*-triplesDec 20 2001We show that every Hilbert C*-module E is a JB*-triple in a canonical way and establish an explicit expression for the holomorphic automorphisms of the unit ball of E.
A note on dyadic coverings and nondoubling Calderón-Zygmund theoryJan 17 2012Mar 15 2012We construct a family of n+1 dyadic filtrations in R^n, so that every Euclidean ball B is contained in some cube Q of our family satisfying diam(Q) \le c_n diam(B) for some dimensional constant c_n. Our dyadic covering is optimal on the number of filtrations ... More
Entropy of leukemia on multidimensional morphological and molecular landscapesMay 30 2014Leukemia epitomizes the class of highly complex diseases that new technologies aim to tackle by using large sets of single-cell level information. Achieving such goal depends critically not only on experimental techniques but also on approaches to interpret ... More
Accreting White DwarfsSep 23 2008Thermonuclear (type Ia) supernovae are explosions in accreting white dwarfs, but the exact scenario leading to these explosions is still unclear. An important step to clarify this point is to understand the behaviour of accreting white dwarfs in close ... More
The space of Constant Mean Curvature surfaces in compact Riemannian ManifoldsMay 16 2011Aug 29 2011The main point of this paper is that, under suitable conditions on the mean curvature and the Ricci curvature of the ambient space, we can extend Choi-Schoen's Compactness Theorem to compact embedded minimal surfaces to simple immersed compact H-surfaces ... More
Rigidity of stable cylinders in three-manifoldsApr 16 2011In this paper we show how the existence of a certain stable cylinder determines (locally) the ambient manifold where it is immersed. This cylinder has to verify a {\it bifurcation phenomena}, we make this explicit in the introduction. In particular, the ... More
LensExplorer, a tool for the visualization of the gravitational lensing effect in the Hubble Frontiers Fields clustersJun 11 2014LensExplorer is an IDL GUI code that can be used to visualize the lensing deflection field derived in the Hubble Frontier Fields clusters. The code can be used for both, research and educational purposes as it offers and intuitive and user friendly way ... More
Unifying Gaussian LWF and AMP Chain Graphs to Model InterferenceNov 11 2018Apr 30 2019An intervention may have an effect on units other than those to which it was administered. This phenomenon is called interference and it usually goes unmodeled. In this paper, we propose to combine Lauritzen-Wermuth-Frydenberg and Andersson-Madigan-Perlman ... More
Identification of Strong Edges in AMP Chain GraphsNov 23 2017Jun 25 2018The essential graph is a distinguished member of a Markov equivalence class of AMP chain graphs. However, the directed edges in the essential graph are not necessarily strong or invariant, i.e. they may not be shared by every member of the equivalence ... More
Reading Dependencies from Covariance GraphsOct 21 2010Jun 26 2012The covariance graph (aka bi-directed graph) of a probability distribution $p$ is the undirected graph $G$ where two nodes are adjacent iff their corresponding random variables are marginally dependent in $p$. In this paper, we present a graphical criterion ... More
The Universe at extreme magnificationJun 12 2018May 14 2019Extreme magnifications of distant objects by factors of several thousand have recently become a reality. Small very luminous compact objects, such as supernovae (SNe), giant stars at z=1-2, Pop III stars at z>7 and even gravitational waves from merging ... More
xPerm: fast index canonicalization for tensor computer algebraMar 06 2008We present a very fast implementation of the Butler-Portugal algorithm for index canonicalization with respect to permutation symmetries. It is called xPerm, and has been written as a combination of a Mathematica package and a C subroutine. The latter ... More
Particle propagation on spacetime manifolds with static defectsMar 10 2017Nov 18 2017We investigate the effects of small static defects in the spacetime manifold. The presence of the defects leads to a modification of the scalar field two-point function in Klein-Gordon theory. We calculate the energy-momentum tensor and discuss the possible ... More
Supersymmetric galileons and auxiliary fields in 2+1 dimensionsDec 14 2016In this work we study various aspects of supersymmetric three-dimensional higher-derivative field theories. We classify all possible models without derivative terms in the auxiliary field of the fermionic sector and find that scalar field theories of ... More
On piecewise smooth cohomology of Lie groupoids and Lie algebroidsMar 30 2012Jan 16 2018Mishchenko's theorem states that piecewise smooth and Lie algebroid cohomology of a transitive Lie algebroid defined over a combinatorial manifold are isomorphic. In this paper, we describe two applications of that result. The first application consists ... More
Learning AMP Chain Graphs under FaithfulnessApr 24 2012This paper deals with chain graphs under the alternative Andersson-Madigan-Perlman (AMP) interpretation. In particular, we present a constraint based algorithm for learning an AMP chain graph a given probability distribution is faithful to. We also show ... More
Identifiability of Gaussian Structural Equation Models with Dependent Errors Having Equal VariancesJun 21 2018Aug 28 2018In this paper, we prove that some Gaussian structural equation models with dependent errors having equal variances are identifiable from their corresponding Gaussian distributions. Specifically, we prove identifiability for the Gaussian structural equation ... More
SUSY Chern-Simons $\mathbb{CP}^N$ and baby Skyrme models and their BPS structuresJul 24 2018We construct the $\mathcal{N}=2$ supersymmetric extensions of different models containing a Chern-Simons term and study their BPS structure. We find that the coupling of the Chern-Simons term to the general gauged nonlinear $\sigma$-model allows for general ... More
General Relativistic Hydrodynamics with Special Relativistic Riemann SolversJul 21 1998We present a general and practical procedure to solve the general relativistic hydrodynamic equations by using any of the special relativistic Riemann solvers recently developed for describing the evolution of special relativistic flows. Our proposal ... More
Boundary-layer turbulence in experiments of quasi-Keplerian flowsAug 19 2016Feb 23 2017Most flows in nature and engineering are turbulent because of their large velocities and spatial scales. Laboratory experiments of rotating quasi-Keplerian flows, for which the angular velocity decreases radially but the angular momentum increases, are ... More
Equimultiple locus of embedded algebroid surfaces and blowing--up in characteristic zeroMar 20 2007The smooth equimultiple locus of embedded algebroid surfaces appears naturally in many resolution process, both classical and modern. In this paper we explore how it changes by blowing--up.
Regularizing effect of homogeneous evolution equations: case homogeneous order zeroJan 24 2019In this paper, we develop a functional analytical theory for establishing that mild solutions of first-order Cauchy problems involving homogeneous operators of order zero are strong solutions; in particular, the first-order time derivative satisfies a ... More
Optimal Fourier filtering of a function that is strictly confined within a sphereJul 31 2008We present an alternative method to filter a distribution, that is strictly confined within a sphere of given radius $r_c$, so that its Fourier transform is optimally confined within another sphere of radius $k_c$. In electronic structure methods, it ... More
Equimultiple locus of embedded algebroid surfaces and blowing--up in arbitrary characteristicMar 20 2007This paper extends previous results of the authors, concerning the behaviour of the equimultiple locus of algebroid surfaces under blowing--up, to arbitrary characteristic.
Cyclic metric Lie groupsJul 02 2014Jul 21 2014Cyclic metric Lie groups are Lie groups equipped with a left-invariant metric which is in some way far from being biinvariant, in a sense made explicit in terms of Tricerri and Vanhecke's homogeneous structures. The semisimple and solvable cases are studied. ... More
Structures and Stabilities of CaO and MgO Clusters and Cluster Ions: An alternative interpretation of the experimental mass spectraApr 19 2000Sep 12 2000The structures and relative stabilities of doubly-charged nonstoichiometric (CaO)$_n$Ca$^{2+}$ (n=1--29) cluster ions and of neutral stoichiometric (MgO)$_n$ and (CaO)$_n$ (n=3,6,9,12,15,18) clusters are studied through {\em ab initio} Perturbed Ion plus ... More
Volume Images Vector Display Based on a Diffractive ScreenJan 17 2011A white light system based on a 65 cm x 35 cm diffractive screen is demonstrated to be capable of displaying three-dimensional figures with continuous horizontal parallax. Three computer-controlled mirrors and a diffractive-refractive optical system are ... More
Learning the Number of Neurons in Deep NetworksNov 19 2016Oct 11 2018Nowadays, the number of layers and of neurons in each layer of a deep network are typically set manually. While very deep and wide networks have proven effective in general, they come at a high memory and computation cost, thus making them impractical ... More
Simple model for a Quantum Wire II. CorrelationsFeb 03 2003In a previous paper (Eur. Phys. J. B 30, 239-251 (2002)) we have presented the main features and properties of a simple model which -in spite of its simplicity- describes quite accurately the qualitative behaviour of a quantum wire. The model was composed ... More
When strictly locally convex hypersurfaces are embeddedFeb 27 2010In this paper we will prove Hadamard-Stoker type theorems in the following ambient spaces: $\man ^n \times \r$, where $\man ^n $ is a $1/4-$pinched manifold, and certain Killing submersions, e.g., Berger spheres and Heisenberg spaces. That is, under the ... More
Complete Constant Mean Curvature surfaces and Bernstein type Theorems in $\mathbb{M}^2\times \mathbb{R}$Aug 25 2008In this paper we study constant mean curvature surfaces $\Sigma$ in a product space, $\mathbb{M}^2\times \mathbb{R}$, where $\mathbb{M}^2$ is a complete Riemannian manifold. We assume the angle function $\nu = \meta{N}{\partial_t}$ does not change sign ... More
A Colding-Minicozzi Stability inequality and its applicationsAug 21 2008Nov 13 2009We consider operators $L$ acting on functions on a Riemannian surface, $\Sigma$, of the form $L = \Delta + V +a K.$ Here $\Delta$ is the Laplacian of $\Sigma$, $V$ a non-negative potential on $\Sigma$, K the Gaussian curvature and $a$ is a non-negative ... More
NMR lineshape in Metallic Nanoparticles: a Matrix Continued Fraction evaluationApr 04 1997May 02 1997In metallic nanoparticles, the different electronic environment seen by each magnetic nucleus produces a distribution of Knight shifts of the NMR frequencies which is observed as an inhomogeneously broadened lineshape. We study the fluctuations in the ... More
Totally umbilical disks and applications to surfaces in three-dimensional homogeneous spacesJul 31 2009Sep 23 2009Following ideas of Choe and Fernandez-do Carmo, we give sufficient conditions for a disk type surface, with piecewise smooth boundary, to be totally umbilical for a given Coddazi pair. As a consequence, we obtain rigidity results for surfaces in space ... More
Non-uniqueness of the supersymmetric extension of the $O(3)$ $σ$-modelMar 21 2017We study the supersymmetric extensions of the $O(3)$ $\sigma$-model in $1+1$ and $2+1$ dimensions. We show that it is possible to construct non-equivalent supersymmetric versions of a given model sharing the same bosonic sector and free from higher-derivative ... More
Infinite chain of N different deltas: a simple model for a Quantum WireJun 25 2002We present the exact diagonalization of the Schrodinger operator corresponding to a periodic potential with N deltas of different couplings, for arbitrary N. This basic structure can repeat itself an infinite number of times. Calculations of band structure ... More
External fluctuations in front dynamics with inertia: The overdamped limitMar 06 2000We study the dynamics of fronts when both inertial effects and external fluctuations are taken into account. Stochastic fluctuations are introduced as multiplicative noise arising from a control parameter of the system. Contrary to the non-inertial (overdamped) ... More
Constraint preserving boundary conditions for the Baumgarte-Shapiro-Shibata-Nakamura formulation in spherical symmetryJul 31 2014Nov 06 2014We introduce a set of constraint preserving boundary conditions for the Baumgarte-Shapiro-Shibata-Nakamura (BSSN) formulation of the Einstein evolution equations in spherical symmetry, based on its hyperbolic structure. While the outgoing eigenfields ... More
The second and third Sonine coefficients of a freely cooling granular gas revisitedDec 16 2008May 04 2009In its simplest statistical-mechanical description, a granular fluid can be modeled as composed of smooth inelastic hard spheres (with a constant coefficient of normal restitution $\alpha$) whose velocity distribution function obeys the Enskog-Boltzmann ... More
A closed formula for the topological entropy of multimodal maps based on min-max symbolsOct 30 2013Topological entropy is a measure of complex dynamics. In this regard, multimodal maps play an important role when it comes to study low-dimensional chaotic dynamics or explain some features of higher dimensional complex dynamics with conceptually simple ... More
Numerical hydrodynamics in special relativityJun 21 1999This review is concerned with a discussion of numerical methods for the solution of the equations of special relativistic hydrodynamics (SRHD). Particular emphasis is put on a comprehensive review of the application of high-resolution shock-capturing ... More
Measuring educational attainment as a continuous variable: a new database (1970-2010)Aug 06 2015Jun 07 2016In this paper, we introduce a new comprehensive data set on educational attainment and inequality measures of education for 142 countries over the period 1970 to 2010. Most of the previous attempts to measure educational attainment have treated education ... More
Compression-aware Training of Deep NetworksNov 07 2017Nov 13 2017In recent years, great progress has been made in a variety of application domains thanks to the development of increasingly deeper neural networks. Unfortunately, the huge number of units of these networks makes them expensive both computationally and ... More
Causal Effect Identification in Acyclic Directed Mixed Graphs and Gated ModelsDec 22 2016May 28 2017We introduce a new family of graphical models that consists of graphs with possibly directed, undirected and bidirected edges but without directed cycles. We show that these models are suitable for representing causal models with additive error terms. ... More
A new spherically symmetric general relativistic hydrodynamical codeSep 25 1995Sep 26 1995In this paper we present a full general relativistic one-dimensional hydro-code which incorporates a modern high-resolution shock-capturing algorithm, with an approximate Riemann solver, for the correct modelling of formation and propagation of strong ... More
On scalar and vector fields coupled to the energy-momentum tensorMar 15 2018May 13 2018We consider theories for scalar and vector fields coupled to the energy-momentum tensor. Since these fields also carry a non-trivial energy-momentum tensor, the coupling prescription generates self-interactions. In analogy with gravity theories, we built ... More
Non-axisymmetric relativistic Bondi-Hoyle accretion onto a Kerr black holeOct 21 1998In our program of studying numerically the so-called Bondi-Hoyle accretion in the fully relativistic regime, we present here first results concerning the evolution of matter accreting supersonically onto a rotating (Kerr) black hole. These computations ... More
Combinatorial Optimization by Learning and Simulation of Bayesian NetworksJan 16 2013This paper shows how the Bayesian network paradigm can be used in order to solve combinatorial optimization problems. To do it some methods of structure learning from data and simulation of Bayesian networks are inserted inside Estimation of Distribution ... More
The exact solution of the Riemann problem in relativistic MHD with tangential magnetic fieldsJun 22 2005We have extended the procedure to find the exact solution of the Riemann problem in relativistic hydrodynamics to a particular case of relativistic magnetohydrodynamics in which the magnetic field of the initial states is tangential to the discontinuity ... More
A "horizon adapted" approach to the study of relativistic accretion flows onto rotating black holesMay 20 1998Aug 21 1998We present a new geometrical approach to the study of accretion flows onto rotating (Kerr) black holes. Instead of Boyer-Lindquist coordinates, the standard choice in all existing numerical simulations in the literature, we employ the simplest example ... More
Evaluation of Exchange-Correlation Energy, Potential, and StressApr 10 2001We describe a method for calculating the exchange and correlation (XC) contributions to the total energy, effective potential, and stress tensor in the generalized gradient approximation. We avoid using the analytical expressions for the functional derivatives ... More
Assessment of a high-resolution central scheme for the solution of the relativistic hydrodynamics equationsJul 27 2004We assess the suitability of a recent high-resolution central scheme developed by Kurganov & Tadmor (2000) for the solution of the relativistic hydrodynamics equations. The novelty of this approach relies on the absence of Riemann solvers in the solution ... More
Simulations of Relativistic Jets with GENESISOct 26 1999The multidimensional relativistic hydrodynamical code GENESIS has been used to obtain first results of {\it 3D} simulations of relativistic jets. We have studied the influence of a slight perturbation of the injection velocity field on the morphodynamics ... More
Positivity and conservation of superenergy tensorsOct 09 2001Feb 25 2002Two essential properties of energy-momentum tensors T_{\mu\nu} are their positivity and conservation. This is mathematically formalized by, respectively, an energy condition, as the dominant energy condition, and the vanishing of their divergence \nabla^\mu ... More
Clifford Algebra Approach to Superenergy TensorsNov 10 1999Senovilla has recently defined an algebraic construction of a superenergy tensor T{A} from any arbitrary tensor A, by structuring it as an r-fold form. This superenergy tensor satisfies automatically the dominant superenergy property. We present a more ... More
Bounds on Gromov Hyperbolicity ConstantMar 04 2015If $X$ is a geodesic metric space and $x_{1},x_{2},x_{3} \in X$, a geodesic triangle $T=\{x_{1},x_{2},x_{3}\}$ is the union of the three geodesics $[x_{1}x_{2}]$, $[x_{2}x_{3}]$ and $[x_{3}x_{1}]$ in $X$. The space $X$ is $\delta$-hyperbolic in the Gromov ... More
Universal deformation rings of modules over Frobenius algebrasNov 05 2009Feb 08 2011Let $k$ be a field, and let $\Lambda$ be a finite dimensional $k$-algebra. We prove that if $\Lambda$ is a self-injective algebra, then every finitely generated $\Lambda$-module $V$ whose stable endomorphism ring is isomorphic to $k$ has a universal deformation ... More
Variational finite-difference representation of the kinetic energy operatorAug 13 2001A potential disadvantage of real-space-grid electronic structure methods is the lack of a variational principle and the concomitant increase of total energy with grid refinement. We show that the origin of this feature is the systematic underestimation ... More
The exponentially truncated q-distribution: A generalized distribution for real complex systemsJul 03 2008To know the statistical distribution of a variable is an important problem in management of resources. Distributions of the power law type are observed in many real systems. However power law distributions have an infinite variance and thus can not be ... More
Quintessence interacting dark energy from induced matter theory of gravityAug 10 2009In the context of the induced matter theory of gravity, we investigate the possibility of deriving a 4D quintessential scenario where an interaction between dark energy and dark matter is allowed, and the dark energy component is modeled by a minimally ... More
Paramagnetic Materials and Practical Algorithmic Cooling for NMR Quantum ComputingNov 16 2005Algorithmic Cooling is a method that uses novel data compression techniques and simplecquantum computing devices to improve NMR spectroscopy, and to offer scalable NMR quantum computers. The algorithm recursively employs two steps. A reversible entropy ... More
Quaternionic ComputingJul 02 2003Nov 05 2004We introduce a model of computation based on quaternions, which is inspired on the quantum computing model. Pure states are vectors of a suitable linear space over the quaternions. Other aspects of the theory are the same as in quantum computing: superposition ... More
Nonlinear electrodynamics and the gravitational redshift of highly magnetised neutron starsMar 02 2004Sep 07 2004The idea that the nonlinear electromagnetic interaction, i. e., light propagation in vacuum, can be geometrized was developed by Novello et al. (2000) and Novello & Salim (2001). Since then a number of physical consequences for the dynamics of a variety ... More
On the base $b$ expansion of the number of trailing zeroes of $b^k!$Feb 22 2010Let us denote by $Z_{b}(n)$ the number of trailing zeroes in the base b expansion of $n!$. In this paper we study the connection between the expression of $\vartheta(b):=\lim_{n\to \infty}Z_{b}(n)/n$ in base $b$, and that of $Z_{b}(b^{k})$. In particular, ... More
On the discriminant of elliptic curves with non-trivial torsionJul 12 2007Jul 19 2007For those elliptic curves defined over the rational with non--trivial torsion subgroup, we find a tight relationship between the torsion subgroup itself and a Galois group naturally arising from the curve.
On the minimum orbital intersection distance computation: a new effective methodJun 21 2018The computation of the Minimum Orbital Intersection Distance (MOID) is an old, but increasingly relevant problem. Fast and precise methods for MOID computation are needed to select potentially hazardous asteroids from a large catalogue. The same applies ... More
The prompt gamma-ray emission of novaeOct 09 2001Classical novae are potential gamma-ray emitters, because of the disintegration of some radioactive nuclei synthesized during the explosion. Some short-lived isotopes (such as 13N and 18F), as well as the medium-lived 22Na, decay emitting positrons, which ... More
Searching for simultaneous arithmetic progressions on elliptic curvesMar 21 2007We look for elliptic curves featuring rational points whose coordinates form two arithmetic progressions, one for each coordinate. A constructive method for creating such curves is shown, for lengths up to 5.
A real variable characterization of Gromov hyperbolicity of flute surfacesMay 31 2008In this paper we give a characterization of the Gromov hyperbolicity of trains (a large class of Denjoy domains which contains the flute surfaces) in terms of the behavior of a real function. This function describes somehow the distances between some ... More
Structure Theorem for Riemannian surfaces with arbitrary curvatureMay 31 2008In this paper we prove that any Riemannian surface, with no restriction of curvature at all, can be decomposed into blocks belonging just to some of these types: generalized Y-pieces, generalized funnels and halfplanes.
Transport coefficients and the 2PI effective action in the large N limitSep 08 2004We discuss the computation of transport coefficients in large N_f QCD and the O(N) model for massive particles. The calculation is organized using the 1/N expansion of the 2PI effective action to next-to-leading order. For the gauge theory, we verify ... More
Torsion of rational elliptic curves over quadratic fields IINov 13 2014Apr 07 2015Let E be an elliptic curve defined over Q and let G=E(Q)_tors be the associated torsion group. In a previous paper, the authors studied, for a given G, which possible groups G\leq H could appear such that H=E(K)_tors, for [K:Q]=2. In the present paper, ... More
ExpandNet: Training Compact Networks by Linear ExpansionNov 26 2018Apr 25 2019While very deep networks can achieve great performance, they are ill-suited to applications in resource-constrained environments. In this paper, we introduce a novel approach to training a given compact network from scratch. We propose to expand each ... More
Deep Probabilistic Ensembles: Approximate Variational Inference through KL RegularizationNov 06 2018Nov 30 2018In this paper, we introduce Deep Probabilistic Ensembles (DPEs), a scalable technique that uses a regularized ensemble to approximate a deep Bayesian Neural Network (BNN). We do so by incorporating a KL divergence penalty term into the training objective ... More
Transplanckian Axion Monodromy !?Dec 12 2018Dec 19 2018We show that warped throats of the Klebanov-Strassler kind, regarded as 5d flux compactifications on K\"ahler-Einstein manifolds $\IX_5$ describe fully backreacted solutions of transplanckian axion monodromy. We show that the asymptotic Klebanov-Tseytlin ... More
Large Degree Asymptotics of Generalized Bernoulli and Euler PolynomialsSep 17 2009Asymptotic expansions are given for large values of $n$ of the generalized Bernoulli polynomials $B_n^\mu(z)$ and Euler polynomials $E_n^\mu(z)$. In a previous paper L\'opez and Temme (1999) these polynomials have been considered for large values of $\mu$, ... More
Improving Exploration in Evolution Strategies for Deep Reinforcement Learning via a Population of Novelty-Seeking AgentsDec 18 2017Oct 29 2018Evolution strategies (ES) are a family of black-box optimization algorithms able to train deep neural networks roughly as well as Q-learning and policy gradient methods on challenging deep reinforcement learning (RL) problems, but are much faster (e.g. ... More
Transport coefficients from the lattice?Sep 03 2002The prospects of extracting transport coefficients from euclidean lattice simulations are discussed. Some general comments on the reconstruction of spectral functions using the Maximal Entropy Method are given as well.
Transport coefficients from the 2PI effective actionMar 25 2003Sep 17 2003We show that the lowest nontrivial truncation of the two-particle irreducible (2PI) effective action correctly determines transport coefficients in a weak coupling or 1/N expansion at leading (logarithmic) order in several relativistic field theories. ... More
Reliable Control for Parameterized Interconnected Systems using LMI techniquesNov 10 2006This work presents the design of a reliable decentralized state feedback control for a class of uncertain interconnected polytopic continous systems. A model of failures in actuators is adopted which considers outages or partial degradation in independent ... More
Global Constraints on Lepton-Quark Contact InteractionsJul 18 2013Nov 26 2013The Large Hadron Collider can do precision physics at a level that is competitive with electroweak precision constraints when probing physics beyond the Standard Model. We present a simple yet general parameterization of the effect of an arbitrary number ... More
ExpandNets: Exploiting Linear Redundancy to Train Small NetworksNov 26 2018Dec 12 2018While very deep networks can achieve great performance, they are ill-suited to applications in resource-constrained environments. Knowledge transfer, which leverages a deep teacher network to train a given small network, has emerged as one of the most ... More
Embedding General Relativity with varying cosmological constant term in five-dimensional Brans-Dicke theory of gravity in vacuumFeb 27 2009We investigate the possibility to recover a four-dimensional (4D) general theory of relativity, as embedded in a 5D spacetime where gravity is governed by a five-dimensional (5D) Brans-Dicke (BD) theory of gravity. Employing the Gauss-Codazzi-Ricci equations ... More
A common algebraic description for probabilistic and quantum computationsDec 16 2002We study the computational complexity of the problem SFT (Sum-free Formula partial Trace): given a tensor formula F over a subsemiring of the complex field (C,+,.) plus a positive integer k, under the restrictions that all inputs are column vectors of ... More
Quantum Arithmetic on Galois FieldsJan 29 2003In this paper we discuss the problem of performing elementary finite field arithmetic on a quantum computer. Of particular interest, is the controlled-multiplication operation, which is the only group-specific operation in Shor's algorithms for factoring ... More
Generation of short and long range temporal correlated noisesMar 17 1999We present the implementation of an algorithm to generate Gaussian random noises with prescribed time correlations that can be either long or short ranged. Examples of Langevin dynamics with short and long range noises are presented and discussed.