Results for "Agustín Sanchez-Arcilla"

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Multivariate statistical modelling of future marine stormsMar 13 2019Extreme events, such as wave-storms, need to be characterized for coastal infrastructure design purposes. Such description should contain information on both the univariate behaviour and the joint-dependence of storm-variables. These two aspects have ... More
Antichains and counterpoint dichotomiesFeb 08 2012Jun 28 2012We construct a special type of antichain (i. e., a family of subsets of a set, such that no subset is contained in another) using group-theoretical considerations, and obtain an upper bound on the cardinality of such an antichain. We apply the result ... More
Existence of Peregrine Solitons in fractional reaction-diffusion equationsJul 16 2018Aug 14 2018In this article, we will analyze the existence of Peregrine type solutions for the fractional diffusion reaction equation by applying Splitting-type methods. These functions that have two main characteristics, they are direct sum of functions of periodic ... More
Conditional Expectation of a Markov Kernel Given Another with Some Applications in Statistical Inference and Disease DiagnosisJun 01 2013Nov 09 2018Markov kernels play a decisive role in probability and mathematical statistics theories, and are an extension of the concepts of sigma-field and statistic. Concepts such as independence, sufficiency, completeness, ancillarity or conditional distribution ... More
Global existence for vector valued fractional reaction-diffusion equationsMay 25 2018Aug 23 2018In this paper, we study the initial value problem for infinite dimensional fractional non-autonomous reaction-diffusion equations. Applying general time-splitting methods, we prove the existence of solutions globally defined in time using convex sets ... More
A Projection-Oriented Mathematical Model for Second-Species CounterpointSep 30 2018Drawing inspiration from both the classical Guerino Mazzola's symmetry-based model for first-species counterpoint (one note against one note) and Johann Joseph Fux's "Gradus ad Parnassum", we propose an extension for second-species (two notes against ... More
Modulation in Tetradic Harmony and its Role in JazzSep 13 2018After a quick exposition of Mazzola's quantum modulation model for the so-called triadic interpretation of the major scale within the equal temperament, we study the model for the tetradic interpretation of the same scale. It is known that tetrads are ... More
Formal recursion operators of integrable nonevolutionary equations and Lagrangian systemsApr 12 2018Aug 13 2018We derive the general structure of the space of formal recursion operators of nonevolutionary equations~$q_{tt}=f(q,q_{x},q_t,q_{xx},q_{xt},q_{xxx},q_{xxxx})$. This allows us to classify integrable Lagrangian systems with a higher order Lagrangian of ... More
On the topology of hypocycloidsMar 24 2017Algebraic geometry has many connections with physics: string theory, enumerative geometry, and mirror symmetry, among others. In particular, within the topological study of algebraic varieties physicists focus on aspects involving symmetry and non-commutativity. ... More
Characteristic varieties of graph manifolds and quasi-projectivity of fundamental groups of algebraic linksApr 01 2019The present paper studies the structure of characteristic varieties of fundamental groups of graph manifolds. As a consequence, a simple proof of Papadima's question is provided on the characterization of algebraic links that have quasi-projective fundamental ... More
Is 1+1=2 an empirical proposition?Jan 25 2016The idea of meaning as use in language is explored in a mathematical and physical context. Two possible scenarios of further analysis are presented: Ordinal arithmetic and String theory.
Regularity of curve integrable spacetimesFeb 23 2015Jun 16 2015The idea of defining a gravitational singularity as an obstruction to the dynamical evolution of a test field (described by a PDE) rather than the dynamical evolution of a particle (described by a geodesics) is explored. In particular, the concept of ... More
Trimming and likelihood: Robust location and dispersion estimation in the elliptical modelNov 04 2008Robust estimators of location and dispersion are often used in the elliptical model to obtain an uncontaminated and highly representative subsample by trimming the data outside an ellipsoid based in the associated Mahalanobis distance. Here we analyze ... More
The Black Hole: Scatterer, Absorber and Emitter of ParticlesNov 10 1997Accurate and powerful computational methods developed by the author for the wave scattering by black holes allow to obtain the highly non trivial total absorption spectrum of the Black Hole. As well as partial wave phase shifts and cross sections (elastic ... More
Geometrothermodynamics of black holes in Lorentz non-invariant massive gravityMar 05 2016We analyze a static and spherically symmetric hairy black hole solution in non-invariant massive gravity. The formalism of geometrothermodynamics is used to describe the thermodynamic characteristics of this black hole in a Legendre invariant way. For ... More
Additive Combination SpacesAug 15 2013We introduce a class of metric spaces called $p$-additive combinations and show that for such spaces we may deduce information about their $p$-negative type behaviour by focusing on a relatively small collection of almost disjoint metric subspaces, which ... More
Some remarks on Causality Theory and Variational Methods in Lorentzian manifoldsDec 04 2007Feb 29 2008In this conference published in 1997 some problems on the geodesics of a Lorentzian manifold concerning causality and infinite-dimensional variational methods, are pointed out. Even though a big progress on many of these questions have been carried out ... More
Black Hole Emission in String Theory and the String Phase of Black HolesJun 25 2001Jul 04 2001String theory properly describes black-hole evaporation. The quantum string emission by Black Holes is computed. The black-hole temperature is the Hawking temperature in the semiclassical quantum field theory (QFT) regime and becomes the intrinsic string ... More
String Driven Cosmology and its PredictionsJun 18 2001Jun 19 2001We present a minimal model for the Universe evolution fully extracted from effective String Theory. This model is by its construction close to the standard cosmological evolution, and it is driven selfconsistently by the evolution of the string equation ... More
A note on causally simple and globally hyperbolic spacetimesOct 27 2006Nov 28 2006This paper has been withdrawn because the part concerning the definition of global hyperbolicity has already been included in an expanded and clearer way in gr-qc/0611138. The remainder will be also extended and posted.
Magnetoasymmetric current fluctuations of single-electron tunnelingMay 06 2008Jan 12 2009We determine the shot noise asymmetry of a quantum dot under reversal of an external magnetic field. The dot is coupled to edge states which invert their chirality when the field is reversed, leading to a magnetoasymmetric electrochemical potential in ... More
A Review of Star Schema BenchmarkJun 01 2016This paper examines the Star Schema Benchmark, an alternative to the flawed TPC-H decision support system and presents reasons why this benchmark should be adopted over the industry standard for decision support systems.
A Review of Pair-wise TestingJun 01 2016In software testing, the large size of the input domain makes exhaustively testing the inputs a daunting and often impossible task. Pair-wise testing is a popular approach to combinatorial testing problems. This paper reviews Pair-wise testing and its ... More
Geodesic connectedness of semi-Riemannian manifoldsMay 04 2000Sep 12 2000The question whether a Riemannian manifold is geodesically connected can be studied from geometrical as well as variational methods, and accurate results can be obtained by using the associated distance and related properties of the positive-definiteness. ... More
Black Holes: Scatterers, Absorbers and Emitters of ParticlesJun 25 2001Accurate and powerful analytic and computational methods developped by the author allow to obtain the highly non trivial total absorption spectrum of the Black Hole, as well as phase shifts and cross sections (elastic and inelastic), the angular distribution ... More
On the Geometry of Static SpacetimesJun 16 2004Jun 26 2004We review geometrical properties of a static spacetime $(M,g)$, including geodesic completeness, causality, standard splittings, compact $M$, closed geodesics and geodesic connectedness. We pay special attention to the critical quadratic behavior at infinity ... More
Green operators for low regularity spacetimesNov 06 2017In this paper we define and construct advanced and retarded Green operators for the wave operator on spacetimes with low regularity. In order to do so we require that the spacetime satisfies the condition of generalised hyperbolicity which is equivalent ... More
Sudakov Representation of the Cachazo-He-Yuan Scattering Equations FormalismDec 12 2017Jan 15 2018We show that the use of Sudakov variables greatly simplifies the study of the solutions to the scattering equations in the Cachazo-He-Yuan formalism. We work in the center-of-mass frame for the two incoming particles, which partially fixes the SL(2,C) ... More
Robust Clustering for Time Series Using Spectral Densities and Functional Data AnalysisFeb 07 2017In this work a robust clustering algorithm for stationary time series is proposed. The algorithm is based on the use of estimated spectral densities, which are considered as functional data, as the basic characteristic of stationary time series for clustering ... More
The fundamental metallicity relation emerges from the local anti-correlation between star formation rate and gas-phase metallicity existing in disk galaxiesMay 14 2019The fundamental metallicity relation (FMR) states that galaxies of the same stellar mass but larger star formation rate (SFR) tend to have smaller gas-phase metallicity (<Zg>). It is thought to be fundamental because it naturally arises from the stochastic ... More
Robust clustering for functional data based on trimming and constraintsJan 12 2017Many clustering algorithms when the data are curves or functions have been recently proposed. However, the presence of contamination in the sample of curves can influence the performance of most of them. In this work we propose a robust, model-based clustering ... More
Generalised hyperbolicity in spacetimes with string-like singularitiesFeb 11 2016Sep 11 2016In this paper we present well-posedness results of the wave equation in $H^{1}$ for spacetimes that contain string-like singularities. These results extend a framework able to characterise gravitational singularities as obstruction to the dynamics of ... More
Generalised hyperbolicity in spacetimes with Lipschitz regularityJul 23 2015Oct 11 2016In this paper, we obtain general conditions under which the wave equation is well-posed in spacetimes with metrics of Lipschitz regularity. In particular, the results can be applied to spacetimes where there is a loss of regularity on a hypersurface such ... More
Nonlinear phenomena in quantum thermoelectrics and heatApr 04 2016We review recent developments in nonlinear quantum transport through nanostructures and mesoscopic systems driven by thermal gradients or in combination with voltage biases. Low-dimensional conductors are excellent platforms to analyze both the thermoelectric ... More
Study of Extra Space Dimensions in Vector Boson Pair Production at LEPSep 08 1999Recent theoretical scenarios propose that quantum gravity effects may manifest at LEP energies by means of gravitons that couple to Standard Model particles and propagate into extra space dimensions. These predictions are checked against the most recent ... More
Self-Gravitating Phase Transitions: Point Particles, Black Holes and StringsJan 26 2006We compute the quantum string entropy S_s(m,j) of the microscopic string states of mass m and spin j in two physically relevant backgrounds: Kerr (rotating) black holes and de Sitter (dS) space-time. We find a new formula for the quantum gravitational ... More
Advances in String Theory in Curved Backgrounds: A Synthesis ReportFeb 28 2003A synthetic report of the advances in the study of classical and quantum string dynamics in curved backgrounds is provided, namely: the new feature of multistring solutions; the effect of a cosmological constant and of spacial curvature on classical and ... More
The energy cost of protein messages lead to a new protein information lawDec 11 2005By considering the energy cost of messages carried by proteins as proportional to their information content we found experimental proof that proteins from all living organisms tend to have their estimated semantic content of information per unit mass, ... More
Development of accurate solutions for a classical oscillatorJun 12 2006We present a method to obtain arbitrarily accurate solutions for conservative classical oscillators. The method that we propose here works both for small and large nonlinearities and provides simple analytical approximations. A comparison with the standard ... More
Geometrothermodynamics of asymptotically anti - de Sitter black holesMay 20 2008Aug 31 2008We apply the formalism of geometrothermodynamics to the case of black holes with cosmological constant in four and higher dimensions. We use a thermodynamic metric which is invariant with respect to Legendre transformations and determines the geometry ... More
Adaptive Quantization Matrices for HD and UHD Display Resolutions in Scalable HEVCJun 07 2016Jun 12 2016HEVC contains an option to enable custom quantization matrices, which are designed based on the Human Visual System and a 2D Contrast Sensitivity Function. Visual Display Units, capable of displaying video data at High Definition and Ultra HD display ... More
On computable abstractions (a conceptual introduction)Aug 29 2014Mar 29 2015This paper introduces abstractions that are meaningful for computers and that can be built and used according to computers' own criteria, i.e., computable abstractions. It is analyzed how abstractions can be seen to serve as the building blocks for the ... More
Geometrical Structures of Space-Time in General RelativityMar 13 2008Space-Time in general relativity is a dynamical entity because it is subject to the Einstein field equations. The space-time metric provides different geometrical structures: conformal, volume, projective and linear connection. A deep understanding of ... More
JND-Based Perceptual Video Coding for 4:4:4 Screen Content Data in HEVCOct 26 2017Feb 12 2018The JCT-VC standardized Screen Content Coding (SCC) extension in the HEVC HM RExt + SCM reference codec offers an impressive coding efficiency performance when compared with HM RExt alone; however, it is not significantly perceptually optimized. For instance, ... More
Initial Results for Electron-Neutrino Appearance in MINOSSep 12 2009MINOS is a long baseline neutrino oscillation experiment designed to make precision measurements of the neutrino mixing parameters associated with the atmospheric neutrino mass splitting. Using a neutrino beam from the Main Injector (NuMI) facility at ... More
The product duality formula in Banach space theoryAug 09 2014In this paper we analyze a definition of product of Banach spaces that is naturally associated by duality with an abstract notion of space of multiplication operators. This dual relation allows to understand several constructions coming from different ... More
On the validity and breakdown of the Onsager symmetry in mesoscopic conductors interacting with environmentsJul 02 2007Jan 25 2008We investigate magnetic-field asymmetries in the linear transport of a mesoscopic conductor interacting with its environment. Interestingly, we find that the interaction between the two systems causes an asymmetry only when the environment is out of equilibrium. ... More
Nonequilibrium spintronic transport through an artificial Kondo impurity: Conductance, magnetoresistance and shot noiseFeb 06 2003We investigate the nonequilibrum transport properties of a quantum dot when spin flip processes compete with the formation of a Kondo resonance in the presence of ferromagnetic leads. Based upon the Anderson Hamiltonian in the strongly interacting limit, ... More
Time-periodic Evans approach to weak KAM theoryDec 29 2017We study the time-periodic version of Evans approach to weak KAM theory. Evans minimization problem is equivalent to a first oder mean field game system. For the mechanical Hamiltonian we prove the existence of smooth solutions. We introduce the corresponding ... More
Noise Effects on Synchronized Globally Coupled OscillatorsFeb 27 1998The synchronized phase of globally coupled nonlinear oscillators subject to noise fluctuations is studied by means of a new analytical approach able to tackle general couplings, nonlinearities, and noise temporal correlations. Our results show that the ... More
Stellar populations of bulges at low redshiftMar 27 2015This chapter summarizes our current understanding of the stellar population properties of bulges and outlines important future research directions.
Path integral formulation of fractional Brownian motion for general Hurst exponentMay 08 2008Jul 08 2008In J. Phys. A: Math. Gen. 28, 4305 (1995), K. L. Sebastian gave a path integral computation of the propagator of subdiffusive fractional Brownian motion (fBm), i.e. fBm with a Hurst or self-similarity exponent $H\in(0,1/2)$. The extension of Sebastian's ... More
Toroidal and Klein bottle boundary slopesJan 03 2006Feb 17 2006Let M be a compact, connected, orientable, irreducible 3-manifold and T' an incompressible torus boundary component of M such that the pair (M,T') is not cabled. By a result of C. Gordon, if S and T are incompressible punctured tori in M with boundary ... More
A theoretical study of meson transition form factorsSep 14 2017Mar 19 2018In this thesis we discuss a rational and data-based description of the single- and double-virutal transition form factors of the lightest pseudoscalar mesons. We obtain an accurate description of these in the spacelike and low-energy timelike regions. ... More
Biophysical analysis of electric current mediated nucleoprotein inactivation processJan 11 2006Motivation: Its well known the use of electric current in the cleaning of viral diseases in plants instead a deep knowledge of this phenomenas theoretical basis is not yet available. The description of the real causes of nucleoprotein inactivation, will ... More
On the discrete Peyrard-Bishop model of DNA: stationary solutions and stabilityNov 22 2005As a first step in the search of an analytical study of mechanical denaturation of DNA in terms of the sequence, we study stable, stationary solutions in the discrete, finite and homogeneous Peyrard-Bishop DNA model. We find and classify all the stationary ... More
The μ-problem, the NMSSM and string theoryMar 05 2010Apr 04 2010We discuss recent developments on the solution of the so-called supersymmetric mu-problem in the context of heterotic orbifolds. In particular, an approximate R symmetry can induce an admissible mu-term in Minkowski vacua of orbifold models with the MSSM ... More
AltAltp: Online Parallelization of Plans with Heuristic State SearchJun 26 2011Despite their near dominance, heuristic state search planners still lag behind disjunctive planners in the generation of parallel plans in classical planning. The reason is that directly searching for parallel solutions in state space planners would require ... More
A Novel Lie Algebra of the Genetic Code over the Galois Field of Four DNA BasesJan 27 2005Oct 05 2005By starting from the four DNA bases order in the Boolean lattice, a novel Lie Algebra of the genetic code is proposed. Here, the principal partitions of the genetic code table were obtained as equivalent classes of quotient subspaces of the genetic code ... More
A topology for the penumbral magnetic fieldsNov 26 2008We describe a scenario for the sunspot magnetic field topology that may account for recent observations of upflows and downflows in penumbrae. According to our conjecture, short narrow magnetic loops fill the penumbral volume. Flows along these field ... More
Physical properties of the solar magnetic photosphere under the MISMA hypothesis III: sunspot at disk centerDec 09 2004Small-scale fluctuations of magnetic field and velocity may be responsible for the Stokes asymmetries observed in all photospheric magnetic structures (the MISMA hypothesis). We support the hypothesis showing that atmospheres with optically-thin micro-structure ... More
Minimizing Compression Artifacts for High Resolutions with Adaptive Quantization Matrices for HEVCSep 21 2016Visual Display Units (VDUs), capable of displaying video data at High Definition (HD) and Ultra HD (UHD) resolutions, are frequently employed in a variety of technological domains. Quantization-induced video compression artifacts, which are usually unnoticeable ... More
On the model companion of partial differential fields with an automorphismSep 13 2013Jul 09 2014We prove that the class of partial differential fields of characteristic zero with an automorphism has a model companion. We then establish the basic model theoretic properties of this theory and prove that it satisfies the Zilber dichotomy for finite ... More
Surfaces with $K^2=2\mathcal{X}-2$ and $p_g\geq 5$Mar 17 2010This note describes minimal surfaces $S$ of general type satisfying $p_g\geq 5$ and $K^2=2p_g$. For $p_g\geq 8$ the canonical map of such surfaces is generically finite of degree 2 and the bulk of the paper is a complete characterization of such surfaces ... More
Nonlinear phenomena in quantum thermoelectrics and heatApr 04 2016Nov 11 2016We review recent developments in nonlinear quantum transport through nanostructures and mesoscopic systems driven by thermal gradients or in combination with voltage biases. Low-dimensional conductors are excellent platforms to analyze both the thermoelectric ... More
Monitoring the synchrotron and Compton emission of PKS 2155-304: one year of observations with RXTE and FermiDec 28 2009PKS 2155-304 is a well known GeV and TeV emitter and one of the brightest blazars in the Fermi sky. We present the results of one year of data taking with Fermi, producing the longest lightcurve on this object. Together with a long duration X-ray monitoring ... More
Three-terminal transport through a quantum dot in the Kondo regime: Conductance, dephasing, and current-current correlationsMar 18 2004Jan 17 2005We investigate the nonequilibrium transport properties of a three-terminal quantum dot in the strongly interacting limit. At low temperatures, a Kondo resonance arises from the antiferromagnetic coupling between the localized electron in the quantum dot ... More
Chirality in Coulomb-blockaded quantum dotsOct 12 2005We investigate the two-terminal nonlinear conductance of a Coulomb-blockaded quantum dot attached to chiral edge states. Reversal of the applied magnetic field inverts the system chirality and leads to a different polarization charge. As a result, the ... More
Magnetic-field asymmetry of nonlinear mesoscopic transportApr 16 2004Sep 10 2004We investigate departures of the Onsager relations in the nonlinear regime of electronic transport through mesoscopic systems. We show that the nonlinear current--voltage characteristic is not an even function of the magnetic field due only to the magnetic-field ... More
Geometric Axioms for Differentially Closed Fields with Several Commuting DerivationsMar 03 2011A geometric first-order axiomatization of differentially closed fields of characteristic zero with several commuting derivations, in the spirit of Pierce-Pillay, is formulated in terms of a relative notion of prolongation for Kolchin-closed sets.
Stiffness and energy losses in cylindrically symmetric superconductor levitating systemsJun 26 2002Stiffness and hysteretic energy losses are calculated for a magnetically levitating system composed of a type-II superconductor and a permanent magnet when a small vibration is produced in the system. We consider a cylindrically symmetric configuration ... More
Radially bounded solutions of a $k$-Hessian equation involving a weighted nonlinear sourceMar 23 2016We consider the problem \begin{equation}(1)\;\;\; \begin{cases} S_k(D^2u)= \lambda |x|^{\sigma} (1-u)^q &\mbox{in }\;\; B,\\ u <0 & \mbox{in }\;\; B,\\ u=0 &\mbox{on }\partial B, \end{cases} \end{equation} where $B$ denotes the unit ball in $\mathbb{R}^n$, ... More
Length scale competition in soliton bearing equations: A collective coordinate approachNov 15 2004We study the phenomenon of length scale competition, an instability of solitons and other coherent structures that takes place when their size is of the same order of some characteristic scale of the system in which they propagate. Working on the framework ... More
Classical and Quantum Strings in plane waves, shock waves and spacetime singularities: synthesis and new resultsFeb 26 2003Key issues of classical and quantum strings in gravitational plane waves, shock waves and spacetime singularities are synthetically understood. This includes the string mass and mode number excitations, energy-momentum tensor, scattering amplitudes, vaccum ... More
New Developments in String Gravity and String Cosmology.A Summary ReportSep 02 2002New Developments in String Gravity and String Cosmology are reported: 1-String driven cosmology and its Predictions. 2-The primordial gravitational wave background in string cosmology. 3-Non-singular string cosmologies from Exact Conformal Field Theories. ... More
Hierarchical Model for the Evolution of Cloud ComplexesJul 23 1998The structure of cloud complexes appears to be well described by a "tree structure" representation when the image is partitioned into "clouds". In this representation, the parent-child relationships are assigned according to containment. Based on this ... More
Models for optical solitons in the two-cycle regimeNov 04 2004We derive model equations for optical pulse propagation in a medium described by a two-level Hamiltonian, without the use of the slowly varying envelope approximation. Assuming that the resonance frequency of the two-level atoms is either well above or ... More
Algebro-geometric axioms for DCF$_{0,m}$Jan 16 2016We give an algebro-geometric first-order axiomatization of DCF$_{0,m}$ (the theory of differentially closed fields of characteristic zero with m commuting derivations) in the spirit of the classical geometric axioms of DCF$_0$.
A Design Methodology for Software Measurement ProgramsJul 17 2013Software measurement programs have emerged as compounds of several measurement activities that are pursued as part of a combined effort of several parties within a software organization, based on interests that the organization has regarding the assessment ... More
G-Structures defined on pseudo-Riemannian manifoldsOct 31 2008Oct 25 2011Concepts and techniques from the theory of G-structures of higher order are applied to the study of certain structures (volume forms, conformal structures, linear connections and projective structures) defined on a pseudo-Riemanniann manifold. Several ... More
Techniques for reducing fiber-fed and integral-field spectroscopy data: The software package R3DJun 12 2006This paper describes the general characteristics of raw data from fiber-fed spectrographs in general and fiber-fed IFUs in particular. The different steps of the data reduction are presented, and the techniques used to address the unusual characteristics ... More
E3D, The Euro3D Visualization Tool I: Description of the program and its capabilitiesOct 23 2003We present the first version of E3D, the Euro3D visualization tool for data from integral field spectroscopy. We describe its major characteristics, based on the proposed requirements, the current state of the project, and some planned future upgrades. ... More
The magnetism of the very quiet SunApr 02 2004When the polarimetric sensitivity and the angular resolution exceed a threshold, magnetic fields show up almost everywhere on the solar surface. Here I revise the observational properties of the weakest polarization signals, which appear in the InterNetwork ... More
The causal hierarchy of spacetimesSep 26 2006Apr 24 2008The full causal ladder of spacetimes is constructed, and their updated main properties are developed. Old concepts and alternative definitions of each level of the ladder are revisited, with emphasis in minimum hypotheses. The implications of the recently ... More
Algebro-geometric axioms for DCF$_{0,m}$Jan 16 2016Jul 19 2017We give an algebro-geometric first-order axiomatization of DCF$_{0,m}$ (the theory of differentially closed fields of characteristic zero with m commuting derivations) in the spirit of the classical geometric axioms of DCF$_0$.
Relative D-groups and differential Galois theory in several derivationsDec 01 2012Sep 13 2013The Galois theory of logarithmic differential equations with respect to relative D-groups in partial differential-algebraic geometry is developed.
Corrigendum to the paper: Geometric Axioms for Differentially Closed Fields with Several Commuting DerivationsOct 11 2012In the proof of Lemma 2.6 (2) the iteration of the map {\tau} was not performed properly and in fact the lemma is wrong; a counterexample is given by f = \bar{x}_1and k = 2. This error does not, however, affect the geometric characterization given in ... More
Internal Structure of Stellar Clusters: Geometry of Star FormationSep 14 2011The study of the internal structure of star clusters provides important clues concerning their formation mechanism and dynamical evolution. There are both observational and numerical evidences indicating that open clusters evolve from an initial clumpy ... More
Triple consistency loss for pairing distributions in GAN-based face synthesisNov 08 2018Generative Adversarial Networks have shown impressive results for the task of object translation, including face-to-face translation. A key component behind the success of recent approaches is the self-consistency loss, which encourages a network to recover ... More
Connecting solutions of the Lorentz force equation do existMay 05 2005Recent results on the maximization of the charged-particle action I in a globally hyperbolic spacetime are discussed and generalized. We focus on the maximization of I over a given causal homotopy class C of curves connecting two causally related events ... More
Words as block of notes and Zipf law in music using visibility algorithmJun 29 2017In this work we were aimed to study music using visibility algorithms. This algorithms are used as a way to get a network, from a time series. However the main idea of this paper was not to study music from the perspective of complex networks, but to ... More
Stability of thermal structures with an internal heating sourceMar 10 2008We study the thermal equilibrium and stability of isobaric, spherical structures having a radiation source located at its center. The thermal conduction coefficient, external heating and cooling rates are represented as power laws of the temperature. ... More
Search for Production of Invisible Final States in Single-Photon Decays of Upsilon(1S)Jul 27 2010Jul 17 2011We search for single-photon decays of the Upsilon(1S) resonance, Upsilon->gamma+invisible, where the invisible state is either a particle of definite mass, such as a light Higgs boson A0, or a pair of dark matter particles, chi chi-bar. Both A0 and chi ... More
The genetic signature of (astronomically induced) life extinctionsSep 24 2005The current understanding of supernova and gamma-ray burst events suggests important effects on the biosphere if one of more of them happened to strike the earth in the past. In this paper we evaluate the possibility that life extinctions which probably ... More
Equilibrium cluster formation and gelationJun 22 2005We study the formation and growth of equilibrium clusters in a suspension of weakly-charged colloidal particles and small non-adsorbing polymers. The effective potential is characterised by a short-range attraction and a long-range repulsion. The size, ... More
Geometrothermodynamics of black holes in two dimensionsFeb 25 2009Oct 22 2009We study the properties of two-dimensional dilatonic black holes from the viewpoint of geometrothermodynamics. We show that the thermodynamic curvature of the equilibrium space vanishes only in the case of a flat spacetime, and it reproduces correctly ... More
Color-Based Coding Unit Level Adaptive Quantization for HEVCSep 15 2016Nov 06 2016HEVC HM 16 includes a Coding Unit (CU) level perceptual quantization technique named AdaptiveQP. AdaptiveQP adjusts the Quantization Parameter (QP) at the CU level based on the spatial activity of samples in the four constituent NxN sub-blocks of the ... More
Color-Based Coding Unit Level Adaptive Quantization for HEVCSep 15 2016HEVC HM 16 includes a Coding Unit (CU) level perceptual quantization technique named AdaptiveQP. AdaptiveQP adjusts the Quantization Parameter (QP) at the CU level based on the spatial activity of samples in the four constituent NxN sub-blocks of the ... More
Advances in String Theory in Curved Space TimesSep 02 2002String Quantum Gravity is motivated and introduced. Advances in the study of the classical and quantum string dynamics in curved spacetime are reported: 1-New Classes of Exact Multistring solutions in curved spacetimes. 2-Mass spectrum of Strings in Curved ... More
Massive star formation in Wolf-Rayet galaxies. V: Star formation rates, masses and the importance of galaxy interactionsMay 05 2010(Abridged) We have performed a comprehensive analysis of a sample of 20 starburst galaxies, most of them classified as Wolf-Rayet galaxies. In this paper, the last of the series, we analyze the global properties of our galaxy sample using multiwavelength ... More