Results for "Marcelo Finger"

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Semantic Parsing Natural Language into SPARQL: Improving Target Language Representation with Neural AttentionMar 12 2018Semantic parsing is the process of mapping a natural language sentence into a formal representation of its meaning. In this work we use the neural network approach to transform natural language sentence into a query to an ontology database in the SPARQL ... More
Using syntactical and logical forms to evaluate textual inference competenceMay 10 2019May 17 2019Ongoing research on natural language inference where we propose a new set of tasks that require specific capacities over linguistic logical forms such as i) Boolean coordination, ii) quantifiers, iii) definitive description, and iv) counting operators. ... More
Quantitative Logic ReasoningMay 14 2019In this paper we show several similarities among logic systems that deal simultaneously with deductive and quantitative inference. We claim it is appropriate to call the tasks those systems perform as Quantitative Logic Reasoning. Analogous properties ... More
Semantic Parsing: Syntactic assurance to target sentence using LSTM Encoder CFG-DecoderJul 18 2018Semantic parsing can be defined as the process of mapping natural language sentences into a machine interpretable, formal representation of its meaning. Semantic parsing using LSTM encoder-decoder neural networks have become promising approach. However, ... More
Classical and quantum satisfiabilityMar 28 2012We present the linear algebraic definition of QSAT and propose a direct logical characterization of such a definition. We then prove that this logical version of QSAT is not an extension of classical satisfiability problem (SAT). This shows that QSAT ... More
Using syntactical and logical forms to evaluate textual inference competenceMay 10 2019In the light of recent breakthroughs in transfer learning for Natural Language Processing, much progress was achieved on Natural Language Inference. Different models are now presenting high accuracy on popular inference datasets such as SNLI, MNLI and ... More
Towards an efficient prover for the C1 paraconsistent logicFeb 19 2012The KE inference system is a tableau method developed by Marco Mondadori which was presented as an improvement, in the computational efficiency sense, over Analytic Tableaux. In the literature, there is no description of a theorem prover based on the ... More
The Cauchy problem of scalar-tensor theories of gravityAug 31 2005Aug 07 2006The 3+1 formulation of scalar-tensor theories of gravity (STT) is obtained in the physical (Jordan) frame departing from the 4+0 covariant field equations. Contrary to the common belief (folklore), the new system of ADM-like equations shows that the Cauchy ... More
Oscillons in Scalar Field Theories: Applications in Higher Dimensions and InflationFeb 19 2006The basic properties of oscillons -- localized, long-lived, time-dependent scalar field configurations -- are briefly reviewed, including recent results demonstrating how their existence depends on the dimensionality of spacetime. Their role on the dynamics ... More
Reply to Comment on ``Dynamics of Weak First Order Phase Transitions''Nov 09 1995A reply to a Comment by Harris and Jungman (Phys. Rev. Lett. 75 (1995), 588), concerning my work on phase mixing and its implications to the dynamics of ``weak'' first order phase transitions.
Thermal Mixing of Phases: Numerical and Analytical StudiesJul 14 1995The dynamics of phase transitions plays a crucial r\^ole in the so-called interface between high energy particle physics and cosmology. Many of the interesting results generated during the last fifteen years or so rely on simplified assumptions concerning ... More
From Cosmos to Intelligent Life: The Four Ages of AstrobiologyFeb 22 2012Mar 02 2012The history of life on Earth and in other potential life-bearing planetary platforms is deeply linked to the history of the universe. Since life as we know it relies on chemical elements forged in dying heavy stars, the universe needs to be old enough ... More
Phase Transitions in the UniverseMar 09 1998During the past two decades, cosmologists turned to particle physics in order to explore the physics of the very early Universe. The main link between the physics of the smallest and largest structures in the Universe is the idea of spontaneous symmetry ... More
Right-Permutative Cellular Automata on Topological Markov ChainsMar 14 2006Jun 08 2007In this paper we consider cellular automata $(\mathfrak{G},\Phi)$ with algebraic local rules and such that $\mathfrak{G}$ is a topological Markov chain which has a structure compatible to this local rule. We characterize such cellular automata and study ... More
The random walks of a Schwarzschild black holeJun 19 1997We show that spinless and neutral black holes in thermal equilibrium with radiation undergo fluctuations of charge and angular momentum. The corresponding spreads for a black hole in contact with charged scalar particles is calculated. The angular momentum ... More
Proximal Markov chain Monte Carlo algorithmsJun 02 2013Apr 03 2015This paper presents a new Metropolis-adjusted Langevin algorithm (MALA) that uses convex analysis to simulate efficiently from high-dimensional densities that are log-concave, a class of probability distributions that is widely used in modern high-dimensional ... More
Black Hole Area Quantization rule from Black Hole Mass FluctuationsDec 06 2016We calculate the black hole mass distribution function that follows from the random emission of quanta by Hawking radiation and with this function we calculate the black hole mass fluctuation. From a complete different perspective we regard the black ... More
Extending Owen's integral table and a new multivariate Bernoulli distributionApr 16 2017Jun 21 2017We extend some equatilites in the Owen's table of normal integrals (A table of normal integrals in Communication in Statistics-Simulation and Computation, 1980). Furthermore a new probabilistic model for a vector of binary random variables is proposed. ... More
Frontiers of Condensed Matter Physics Explored with High-Field Specific HeatApr 06 2010Production of very high magnetic fields in the laboratory has relentlessly increased in quantity and quality over the last five decades, and a shift occurred from research focused in magnet technology to studies of the fundamental physics of novel materials ... More
Pseudo-Stable BubblesAug 16 1993The evolution of spherically symmetric unstable scalar field configurations (``bubbles'') is examined for both symmetric (SDWP) and asymmetric (ADWP) double-well potentials. Bubbles with initial static energies $E_0\la E_{{\rm crit}}$, where $E_{{\rm ... More
Two Lectures On Phase MixingFeb 03 1998The dynamics of phase transitions plays a crucial r\^ole in the so-called interface between high energy particle physics and cosmology. Many of the interesting results generated during the last fifteen years or so rely on simplified assumptions concerning ... More
Dynamics of spherically symmetric spacetimes: hydrodynamics and radiationJan 18 2002Using the 3+1 formalism of general relativity we obtain the equations governing the dynamics of spherically symmetric spacetimes with arbitrary sources. We then specialize for the case of perfect fluids accompanied by a flow of interacting massless or ... More
On the linear and weak-field limits of scalar-tensor theories of gravityFeb 21 2002The linear approximation of scalar-tensor theories of gravity is obtained in the physical (Jordan) frame under the 4+0 (covariant) and 3+1 formalisms. Then the weak-field limit is analyzed and the conditions leading to significant deviations of the $1/r^{2}$ ... More
The Origin of Baryonic Matter in the Universe: A Brief ReviewFeb 13 1996I briefly review the main ideas and challenges involved in the computation of the observed baryonic asymmetry of the Universe.
d-dimensional Oscillating Scalar Field Lumps and the Dimensionality of SpaceAug 28 2004Extremely long-lived, time-dependent, spatially-bound scalar field configurations are shown to exist in $d$ spatial dimensions for a wide class of polynomial interactions parameterized as $V(\phi) = \sum_{n=1}^h\frac{g_n}{n!}\phi^n$. Assuming spherical ... More
Dynamics of Weak First Order Phase TransitionsMar 18 1994The dynamics of weak vs. strong first order phase transitions is investigated numerically for 2+1 dimensional scalar field models. It is argued that the change from a weak to a strong transition is itself a (second order) phase transition, with the order ... More
The Inertial Polarization Principle: The Mechanism Underlying Sonoluminescence?Mar 11 2001In this paper we put forward a mechanism in which imploding shock waves emit electromagnetic radiation in the spectral region $\lambda_{0}\cong 2\pi R_{0}.$, where R$_{0}$ is the radius of the shock by the time it is first formed. The mechanism relies ... More
Standard decomposition of expansive ergodically supported dynamicsJan 30 2012Jun 04 2014In this work we introduce the notion of weak quasigroups, that are quasigroup operations defined almost everywhere on some set. Then we prove that the topological entropy and the ergodic period of an invertible expansive ergodically supported dynamical ... More
Right-Permutative Cellular Automata on Topological Markov ChainsMar 14 2006Feb 14 2017In this paper we consider cellular automata $(\mathfrak{G},\Phi)$ with algebraic local rules and such that $\mathfrak{G}$ is a topological Markov chain which has a structure compatible to this local rule. We characterize such cellular automata and study ... More
Drake Equation for the Multiverse: From the String Landscape to Complex LifeFeb 08 2010It is argued that selection criteria usually referred to as "anthropic conditions" for the existence of intelligent (typical) observers widely adopted in cosmology amount only to preconditions for primitive life. The existence of life does not imply in ... More
What We Know and What We Don't Know About the UniverseJan 12 2004I present a non-technical and necessarily biased and incomplete overview of our present understanding of the physical universe and its constituents, emphasizing what we have learned from the explosive growth in cosmological and astrophysical data acquisition ... More
On the Strength of First Order Phase TransitionsMay 11 1994Electroweak baryogenesis may solve one of the most fundamental questions we can ask about the universe, that of the origin of matter. It has become clear in the past few years that it also poses a multi-faceted challenge. In order to compute the tiny ... More
Baryogenesis in BriefJul 25 1994In this talk I briefly review the main ideas and challenges involved in the computation of the baryon asymmetry of the Universe. (Invited talk given at ``The Birth of the Universe and Fundamental Physics'', Rome, May 18--21, 1994.)
Interplay between quasi-periodicity and disorder in quantum spin chains in a magnetic fieldJan 24 2002We study the interplay between disorder and a quasi periodic coupling array in an external magnetic field in a spin-1/2 XXZ chain. A simple real space decimation argument is used to estimate the magnetization values where plateaux show up. The latter ... More
A simple theorem to generate exact black hole solutionsApr 02 2003Oct 17 2003Under certain conditions imposed on the energy-momentum tensor, a theorem that characterizes a two-parameter family of static and spherically symmetric solutions to Einstein's field equations (black holes), is proved. A discussion on the asymptotics, ... More
From endomorphisms to automorphisms and back: dilations and full cornersNov 18 1999When S is a discrete subsemigroup of a discrete group G such that G = S^{-1} S, it is possible to extend circle-valued multipliers from S to G; to dilate (projective) isometric representations of S to (projective) unitary representations of G; and to ... More
Compact Lie algebras, transversely Lie foliations and fibrationsOct 06 2009Jul 15 2010We study Lie foliations on compact manifolds, in case the Lie group is compact. Our main results improve Tischler classical result on the existence of fibration and, as an application, we study the case the manifold has an amenable fundamental group.
Asymmetric Spatiotemporal Evolution of Prebiotic HomochiralityJun 23 2006Nov 13 2006The role of asymmetry on the evolution of prebiotic homochirality is investigated in the context of autocatalytic polymerization reaction networks. A model featuring enantiometric cross-inhibition and chiral bias is used to study the diffusion equations ... More
The mechanism of long-term coarsening of granular mixtures in rotating drumsDec 23 2014Nov 11 2015Three fundamental segregation and pattern formation processes are known in granular mixtures in a rotating cylindrical drum: radial segregation, axial banding, and coarsening of the band pattern. While the mechanism for the first effect is well understood ... More
Signs of Magnetic Accretion in the X-ray Pulsar Binary GX 301-2Apr 23 2012Observations of the cyclotron resonance scattering feature in the X-ray spectrum of GX 301-2 suggest that the surface field of the neutron star is B_CRSF ~ 4 x 10^{12}G. The same value has been derived in modelling the rapid spin-up episodes in terms ... More
Cuntz-Krieger algebras for infinite matricesDec 18 1997Feb 01 1998Given an arbitrary infinite 0--1 matrix A having no identically zero rows, we define an algebra OA as the universal C*-algebra generated by partial isometries subject to conditions that generalize, to the infinite case, those introduced by Cuntz and Krieger ... More
Series expansion analysis of a tetrahedral cluster spin chainSep 14 2005Using series expansion by continuous unitary transformations we study the magnetic properties of a frustrated tetrahedral spin-1/2 chain. Starting from the limit of isolated tetrahedra we analyze the evolution of the ground state energy and the elementary ... More
Zero-temperature magnetism in the periodic Anderson model in the limit of large dimensionsJul 04 1995We study the magnetism in the periodic Anderson model in the limit of large dimensions by mapping the lattice problem into an equivalent local impurity self-consistent model. Through a recently introduced algorithm based on the exact diagonalization of ... More
Integer filling metal insulator transitions in the degenerate Hubbard modelNov 06 1996We obtain exact numerical solutions of the degenerate Hubbard model in the limit of large dimensions (or large lattice connectivity). Successive Mott-Hubbard metal insulator transitions at integer fillings occur at intermediate values of the interaction ... More
Objects of Categories as Complex NumbersDec 30 2002In many everyday categories (sets, spaces, modules, ...) objects can be both added and multiplied. The arithmetic of such objects is a challenge because there is usually no subtraction. We prove a family of cases of the following principle: if an arithmetic ... More
A General Theory of Oscillon DynamicsOct 30 2009We present a comprehensive, nonperturbative analytical method to investigate the dynamics of time-dependent oscillating scalar field configurations. The method is applied to oscillons in a double well Klein-Gordon model in two and three spatial dimensions, ... More
Social games in a social networkOct 05 2000We study an evolutionary version of the Prisoner's Dilemma game, played by agents placed in a small-world network. Agents are able to change their strategy, imitating that of the most successful neighbor. We observe that different topologies, ranging ... More
Small world effect in an epidemiological modelOct 05 2000A model for the spread of an infection is analyzed for different population structures. The interactions within the population are described by small world networks, ranging from ordered lattices to random graphs. For the more ordered systems, there is ... More
Limited Frequency Range Observations of Cosmological Point SourcesOct 04 1999Jun 05 2002This paper advances a general proposal for testing non-standard cosmological models by means of observational relations of cosmological point sources in some specific waveband, and their use in the context of the data provided by the galaxy redshift surveys, ... More
The Apparent Fractal Conjecture: Scaling Features in Standard CosmologiesApr 10 2001This paper presents an analysis of the smoothness problem in cosmology by focussing on the ambiguities originated in the simplifying hypotheses aimed at observationally verifying if the large-scale distribution of galaxies is homogeneous, and conjecturing ... More
Shear and Vorticity in an Accelerating Brans-Dicke Lambda-Universe with TorsionJul 11 2008Aug 06 2008We study accelerating Universes with power-law scale-factors. We include shear and vorticity, a cosmological "constant" term, and spin from torsion, as in Einstein-Cartan's theory when a scalar-field of Brans-Dicke type acts in the model. We find a "no-hair" ... More
Gravitomagnetism and Angular Momenta of Black-HolesAug 04 2006Aug 06 2008We review the energy contents formulae of Kerr-Newman black-holes, where gravitomagnetic energy term comes to play(Berman, 2006; 2006a; 2004). Then, we obtain the angular momenta formulae, which include the gravitomagnetic effect. Three theorems can be ... More
On the Zero-energy UniverseMay 11 2006Aug 16 2009We consider the energy of the Universe, from the pseudo-tensor point of view(Berman,1981). We find zero values, when the calculations are well-done.The doubts concerning this subject are clarified, with the novel idea that the justification for the calculation ... More
On the Semisimplicty of the Action of the Frobenius on Etale CohomologySep 03 2010Jul 30 2011I give a proof of the semisimplicity of the action of the geometric frobenius on etale cohomology. This proof is based on the Weil Conjectures.
Structure of the Loday-Ronco Hopf algebra of treesSep 02 2004Apr 05 2005Loday and Ronco defined an interesting Hopf algebra structure on the linear span of the set of planar binary trees. They showed that the inclusion of the Hopf algebra of non-commutative symmetric functions in the Malvenuto-Reutenauer Hopf algebra of permutations ... More
Efficient spectroscopy of single embedded emitters using optical fiber taper waveguidesApr 17 2009Jun 11 2009A technique based on using optical fiber taper waveguides for probing single emitters embedded in thin dielectric membranes is assessed through numerical simulations. For an appropriate membrane geometry, photoluminescence collection efficiencies in excess ... More
Representations of matched pairs of groupoids and applications to weak Hopf algebrasFeb 07 2004We introduce the category of set-theoretic representations of a matched pair of groupoids. This is a monoidal category endowed with a monoidal functor to the category of quivers over the common base of the groupoids in the matched pair (the forgetful ... More
A composition between risk and deviation measuresNov 22 2015May 24 2018The intuition of risk is based on two main concepts: loss and variability. In this paper, we present a composition of risk and deviation measures, which contemplate these two concepts. Based on the proposed Limitedness axiom, we prove that this resulting ... More
Representations of Generalized Almost-Jordan algebrasSep 18 2013This paper deals with the variety of commutative algebras satisfying one of the four families of degree four identities found by Carini, Hentzel and Piacentini-Cattaneo in 1988. We give a characterization of representations and irreducible modules on ... More
Information-Entropic Stability Bound for Compact Objects: Application to Q-Balls and the Chandrasekhar Limit of PolytropesJul 01 2013Nov 13 2013Spatially-bound objects across diverse length and energy scales are characterized by a binding energy. We propose that their spatial structure is mathematically encoded as information in their momentum modes and described by a measure known as configurational ... More
Remarks on the Einstein-Euler-Entropy systemJan 23 2013We prove short-time existence for the Einstein-Euler-Entropy system for non-isentropic fluids with data in uniformly local Sobolev spaces. The cases of compact as well as non-compact Cauchy surfaces are covered. The method employed uses a Lagrangian description ... More
Quantum states of the spacetime, and formation of black holes in AdSMay 14 2012Oct 31 2012We argue that a non-perturbative description of quantum gravity should involve two (non-interacting) copies of a dual field theory on the boundary, and describe the states of the spacetimes accordingly. So, for instance, a complete description of the ... More
The role of curvature in quantum statistical mechanicsAug 06 2018In this manuscript, we calculate the scalar curvature of a two-dimensional thermodynamic space to study the properties of two thermodynamic systems. In particular, we study the stability and possible anyonic behavior of quantum group invariant systems ... More
Reacting to Variations in Product Demand: An Application for Conversion Rate (CR) Prediction in Sponsored SearchMay 25 2018In online internet advertising, machine learning models are widely used to compute the likelihood of a user engaging with product related advertisements. However, the performance of traditional machine learning models is often impacted due to variations ... More
Positive topological entropy for Reeb flows on 3-dimensional Anosov contact manifoldsDec 10 2015Let $(M, \xi)$ be a compact contact 3-manifold and assume that there exists a contact form $\alpha_0$ on $(M, \xi)$ whose Reeb flow is Anosov. We show this implies that every Reeb flow on $(M, \xi)$ has positive topological entropy. Our argument builds ... More
Information Dynamics at a Phase TransitionJun 30 2016Sep 01 2016We propose a new way of investigating phase transitions in the context of information theory. We use an information-entropic measure of spatial complexity known as configurational entropy (CE) to quantify both the storage and exchange of information in ... More
Igusa-Todorov functions for Artin algebrasMay 31 2016In this paper we study the behaviour of the Igusa-Todorov functions for Artin algebras A with finite injective dimension, and Gorenstein algebras as a particular case. We show that the $\phi$-dimension and $\psi$-dimension are finite in both cases. Also ... More
A fast algorithm for computing irreducible triangulations of closed surfaces in $E^d$Sep 21 2014Oct 27 2014We give a fast algorithm for computing an irreducible triangulation $T^\prime$ of an oriented, connected, boundaryless, and compact surface $S$ in $E^d$ from any given triangulation $T$ of $S$. If the genus $g$ of $S$ is positive, then our algorithm takes ... More
Limits on the neutrino magnetic dipole moment from the luminosity function of hot white dwarfsJul 05 2014Recent determinations of the white dwarf luminosity function (WDLF) from very large surveys have extended our knowledge of the WDLF to very high luminosities. This, together with the availability of new full evolutionary white dwarf models that are reliable ... More
Area Operators in Holographic Quantum GravityApr 11 2014We argue that the holographic formula relating entanglement entropy and the area of a minimal surface is the key to define the area of surfaces in the (emergent) spacetime from the dual theory on the boundary. So we promote the entropy/area relation to ... More
Functorial Semantics of Second-Order Algebraic TheoriesJan 19 2014The purpose of this work is to complete the algebraic foundations of second-order languages from the viewpoint of categorical algebra as developed by Lawvere. To this end, this paper introduces the notion of second-order algebraic theory and develops ... More
A note on the definition of sliding block codes and the Curtis-Hedlund-Lyndon TheoremJul 08 2015Sep 28 2015In this note we propose an alternative definition for sliding block codes between shift spaces. This definition coincides with the usual definition in the case that the shift space is defined on a finite alphabet, but it encompass a larger class of maps ... More
Legendrian contact homology and topological entropySep 12 2014Apr 23 2016In this paper we study the growth rate of a version of Legendrian contact homology, which we call strip Legendrian contact homology, in 3-dimensional contact manifolds and its relation to the topological entropy of Reeb flows. We show that: if for a pair ... More
An Objective Representation of the Gaussian IntegersNov 28 2002May 13 2004A rig is a riNg without Negatives. We analyse the free rig on a generator x subject to the equivalence x = 1 + x + x^2, showing that in it the non-constant polynomials form a ring. This ring can be identified with the Gaussian integers, which thus acquire ... More
Dynamical Emergence of Complex Structures in Field TheoriesSep 13 2007Nonlinear field theories can be used to study both standard physics questions, or to study questions such as the emergence of order and complexity. These theories are generally derived from the symmetries of a given problem and the interactions that respect ... More
Prebiotic Homochirality as a Critical PhenomenonJan 18 2006The development of prebiotic homochirality on early-Earth or another planetary platform may be viewed as a critical phenomenon. It is shown, in the context of spatio-temporal polymerization reaction networks, that environmental effects -- be them temperature ... More
Anisotropic Stars: Exact SolutionsDec 12 2000We study the effects of anisotropic pressure on the properties of spherically symmetric, gravitationally bound objects. We consider the full general relativistic treatment of this problem and obtain exact solutions for various form of equations of state ... More
Anisotropic Stars: Exact Solutions and StabilityJan 26 2004I report on recent work concerning the existence and stability of self-gravitating spheres with anisotropic pressure. After presenting new exact solutions, Chandrasekhar's variational formalism for radial perturbations is generalized to anisotropic objects ... More
Gravitational Waves from Collapsing Vacuum DomainsJul 24 1998Nov 10 1998The breaking of an approximate discrete symmetry, the final stages of a first order phase transition, or a post-inflationary biased probability distribution for scalar fields are possible cosmological scenarios characterized by the presence of unstable ... More
Endomorphisms of B(H), extensions of pure states, and a class of representations of O_nSep 26 1997Let F_n be the fixed-point algebra of the gauge action of the circle on the Cuntz algebra O_n. For every pure state \rho of F_n and every representation \theta of C(T) we construct a representation of O_n, and we use the resulting class of representations ... More
The Geometry of Entanglement Sudden DeathMar 14 2007Jun 25 2007In open quantum systems, entanglement can vanish faster than coherence. This phenomenon is usually called sudden death of entanglement. In this paper sudden death of entanglement is discussed from a geometrical point of view, in the context of two qubits. ... More
New universality classes for generic higher character Lifshitz pointsMar 22 2004We describe new universality classes associated to generic higher character Lifshitz critical behaviors for systems with arbitrary short range competing interactions. New renormalization-group arguments are proposed for anisotropic and isotropic systems. ... More
The Social Behavior and the Evolution of Sexually Transmitted DiseasesDec 03 2002We introduce a model for the evolution of sexually transmitted diseases, in which the social behavior is incorporated as a determinant factor for the further propagation of the infection. The system may be regarded as a society of agents where in principle ... More
Long-Lived Localized Field Configurations in Small Lattices: Application to OscillonsAug 29 1999Long-lived localized field configurations such as breathers, oscillons, or more complex objects naturally arise in the context of a wide range of nonlinear models in different numbers of spatial dimensions. We present a numerical method, which we call ... More
Entropy of the UniverseApr 20 2009After a discussion on several limiting cases where General Relativity turns into less sophisticated theories, we find that in the correct thermodynamical and cosmological weak field limit of Einstein's field equations the entropy of the Universe is R^(3/2) ... More
A General Relativistic Rotating Evolutionary Universe - Part IIJan 13 2008Aug 06 2008As a sequel to (Berman, 2008a), we show that the rotation of the Universe can be dealt by generalised Gaussian metrics, defined in this paper. Robertson-Walker's metric has been employed with proper-time, in its standard applications; the generalised ... More
Hybrid gap modes induced by fiber taper waveguides: application in spectroscopy of single solid-state emitters deposited on thin filmsFeb 19 2010We show, via simulations, that an optical fiber taper waveguide can be an efficient tool for photoluminescence and resonant, extinction spectroscopy of single emitters, such as molecules or colloidal quantum dots, deposited on the surface of a thin dielectric ... More
A standard form for generator matrices with respect to the Niederreiter-Rosenbloom-Tsfasman metricMay 12 2011In this note, we present an analogue for codes in vector spaces with a Rosenbloom-Tsfasman metric of the well-known standard form of generator matrices for codes in spaces with the Hamming metric.
THERMAL EFFECTS ON THE CATALYSIS BY A MAGNETIC FIELDApr 17 1995We show that the formation of condensates in the presence of a constant magnetic field in 2+1 dimensions is extremely unstable. It disappears as soon as a heat bath is introduced with or without a chemical potential. We point out some new nonanalytic ... More
Average sex ratio and population maintenance costApr 13 2010Feb 14 2017The ratio of males to females in a population is a meaningful characteristic of sexual species. The reason for this biological property to be available to the observers of nature seems to be a question never asked. Introducing the notion of historically ... More
Lagrange's Theorem for Hopf Monoids in SpeciesMay 27 2011Jul 31 2012Following Radford's proof of Lagrange's theorem for pointed Hopf algebras, we prove Lagrange's theorem for Hopf monoids in the category of connected species. As a corollary, we obtain necessary conditions for a given subspecies K of a Hopf monoid H to ... More
A scenario for the electronic state in the manganase perovskites: the orbital correlated metalDec 10 1996May 12 1997We argue that, at low temperatures and well into the ferromagnetic phase, the physics of the manganase perovskites may be characterized by a correlated metallic state near a metal insulator transition where the orbital degrees of freedom play a main role. ... More
Entropic Measure for Localized Energy Configurations: Kinks, Bounces, and BubblesNov 23 2011Jun 04 2012We construct a configurational entropy measure in functional space. We apply it to several nonlinear scalar field models featuring solutions with spatially-localized energy, including solitons and bounces in one spatial dimension, and critical bubbles ... More
Thermal Phase Mixing During First Order Phase TransitionsOct 06 1994Oct 11 1994The dynamics of first order phase transitions are studied in the context of (3+1)-dimensional scalar field theories. Particular attention is paid to the question of quantifying the strength of the transition, and how `weak' and `strong' transitions have ... More
Weakly First Order Cosmological Phase Transitions and Fermion ProductionNov 16 1999Sep 17 2001We study weakly first order cosmological phase transitions in finite temperature field theories. Focusing on the standard electroweak theory and its minimal supersymmetric extension, we identify the regimes of Higgs masses for which the phase transition ... More
Matching numerical simulations to continuum field theories: A lattice renormalization studyJul 09 1996The study of nonlinear phenomena in systems with many degrees of freedom often relies on complex numerical simulations. In trying to model realistic situations, these systems may be coupled to an external environment which drives their dynamics. For nonlinear ... More
A Dirac Morphism for the Farrell-Jones Isomorphism Conjecture in K-TheoryJan 06 2012We construct a Dirac morphism and prove that if this Dirac morphism is invertible, then the isomorphism conjecture for non-connective algebraic K-theory holds true.
The gravitational Vavilov-Cherenkov effectMay 20 1998In this essay we show that an uncharged black-hole moving superluminally in a transparent dielectric medium violates Hawking's area theorem. The violation is overcome through the emission of radiation. Since modes cannot emerge from the black hole itself, ... More
Relativistic Fractal CosmologiesOct 26 2009This article reviews an approach for constructing a simple relativistic fractal cosmology whose main aim is to model the observed inhomogeneities of the distribution of galaxies by means of the Lemaitre-Tolman solution of Einstein's field equations for ... More
On Modelling a Relativistic Hierarchical (Fractal) Cosmology by Tolman's Spacetime. II. Analysis of the Einstein-de Sitter ModelJul 07 2008This paper studies the spatially homogeneous Einstein-de Sitter cosmological model in the context of a relativistic hierarchical (fractal) cosmology as developed in paper I (0807.0866). The Einstein-de Sitter model is treated as a special case of Lemaitre-Tolman's ... More