Results for "Y. Contreras"

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Kähler fibrations in quantum information theoryJan 29 2018We discuss the fibre bundle of co-adjoint orbits of compact Lie groups, and show how it admits a compatible K\"ahler structure. The case of the unitary group allows us to reformulate the geometric framework of quantum information theory. In particular, ... More
Minimal Geometric Deformation in asymptotically (A-)dS space-times and the isotropic sector for a polytropic black holeSep 26 2018Dec 03 2018In the context of the Minimal Geometric Deformation method, in this paper we implement the inverse problem in a black hole scenario. In order to deal with an anisotropic polytropic black hole solution of the Einstein field equations with cosmological ... More
A non-linear minimization calculation of the renormalized frequency $\tildeω$ in dirty d-wave superconductorsDec 19 2018Jan 13 2019This work performs a comparative numerical study of the impurity average self-frequency $\tilde{\omega}$ in an unconventional superconducting alloy with non-magnetic impurities. Two methods are used: the Levenberg-Marquardt algorithm as a non-linear minimization ... More
A self-sustained traversable scale-dependent wormholeApr 03 2018A self--sustained traversable wormhole is obtained as a vacuum solution of a scale-dependent gravitational theory. Comparison with other approaches towards wormhole self--sustainability are presented, with emphasis on the running of the gravitational ... More
Minimal geometric deformation decoupling in $2+1$ dimensional space-timesMay 27 2018Jul 04 2018We study the minimal geometric deformation decoupling in $2+1$ dimensional space--times and implement it as a tool for obtaining anisotropic solutions from isotropic geometries. Interestingly, both the isotropic and the anisotropic sector fulfill Einstein ... More
Extended gravitational decoupling in $2+1$ dimensional space--timesFeb 25 2019Feb 27 2019In this work we extend the so--called Minimal Geometric Deformation method in $2+1$ dimensional space--times with cosmological constant. We obtain that the conditions for gravitational decoupling of two circularly symmetric sources coincides with those ... More
Rapidity dependence of saturation in inclusive HERA data with the rcBK equationJan 27 2015Sep 06 2016The contribution of the different terms of the running-coupling Balistky-Kovchegov (rcBK) equation to the description of inclusive HERA data is discussed. Within this framework an alternative definition of the saturation scale is presented. The definition ... More
Towards CNN map representation and compression for camera relocalisationSep 15 2017May 16 2018This paper presents a study on the use of Convolutional Neural Networks for camera relocalisation and its application to map compression. We follow state of the art visual relocalisation results and evaluate the response to different data inputs. We use ... More
Nearly Parallel Vortex Filaments in the 3D Ginzburg-Landau EquationsJun 02 2016Sep 06 2017We introduce a framework to study the occurrence of vortex filament concentration in $3D$ Ginzburg-Landau theory. We derive a functional that describes the free-energy of a collection of nearly-parallel quantized vortex filaments in a cylindrical $3$-dimensional ... More
Renormalization group analysis of reggeon field theory: flow equationsNov 24 2014Can large distance high energy QCD be described by Reggeon Field Theory as an effective emergent theory? We start to investigate the issue employing functional renormalisation group techniques.
Inversion of normal moveout for monoclinic mediaDec 27 2018Jan 19 2019Multiple vertical fracture sets, possibly combined with horizontal fine layering, produce an equivalent medium of monoclinic symmetry with a horizontal symmetry plane. Here, we show that multi component wide azimuth reflection data (combined with known ... More
Lipschitz spaces adapted to Schrödinger operators and regularity propertiesJan 21 2019It is well known that the class of measurable functions which satisfy $$ \sup_{|z|>0}\frac{\|f(\cdot+z)+f(\cdot-z)-2f(\cdot)\|_\infty}{|z|^\alpha}<\infty $$ coincides with the class of Lipschitz functions for $0<\alpha<1$, with the Zygmund class if $\alpha=1$ ... More
Boundary regularity of weakly anchored harmonic mapsSep 14 2015In this note we study the boundary regularity of minimizers of a family of weak anchoring energies that model the states of liquid crystals. We establish optimal boundary regularity in all dimensions $n\geq 3 .$ In dimension $n=3,$ this yields full regularity ... More
Properties of protons in nuclear medium with AdS/QCD model with a quadratic modified dilatonDec 03 2018A modified version of the usual soft wall quadratic dilaton, a dilaton which catches the variation of the proton mass inside nucleons in the nuclear medium is used. With this dilaton, called nuclear dilaton, we have calculated the electromagnetic form ... More
An elementary proof of eigenvalue preservation for the co-rotational Beris-Edwards systemOct 03 2018We study the co-rotational Beris-Edwards system modeling nematic liquid crystals and revisit the eigenvalue preservation property discussed in \cite{XZ16}. We give an alternative but direct proof to the eigenvalue preservation of the initial data for ... More
Multimodal feedback for active robot-object interactionSep 10 2018In this work, we present a multimodal system for active robot-object interaction using laser-based SLAM, RGBD images, and contact sensors. In the object manipulation task, the robot adjusts its initial pose with respect to obstacles and target objects ... More
Verbal Disinhibition towards Robots is Associated with General AntisocialityAug 03 2018The emergence of agentic technologies (e.g., robots) in increasingly public realms (e.g., social media) has revealed surprising antisocial tendencies in human-agent interactions. In particular, there is growing indication of people's propensity to act ... More
Ellipsoidal impulse responses in fractured mediaDec 16 2018Multiple vertical fracture sets, combined with horizontal fine layering produce an equivalent medium of orthorhombic or monoclinic symmetry. This is particularly important in fracture reservoir characterization. Fractured reservoirs are azimuthal anisotropic ... More
Orbital Stability of Domain Walls in Coupled Gross-Pitaevskii SystemsFeb 02 2017Aug 23 2017Domain walls are minimizers of energy for coupled one-dimensional Gross--Pitaevskii systems with nontrivial boundary conditions at infinity. It has been shown that these solutions are orbitally stable in the space of complex $\dot{H}^1$ functions with ... More
On the convergence of minimizers of singular perturbation functionalsJul 25 2016Sep 16 2017The study of singular perturbations of the Dirichlet energy is at the core of the phenomenological-description paradigm in soft condensed matter. Being able to pass to the limit plays a crucial role in the understanding of the geometric-driven profile ... More
Numerical upscaling of the free boundary dam problem in multiscale high-contrast mediaFeb 17 2019In this paper, we address the numerical homogenization approximation of a free-boundary dam problem posed in a heterogeneous media. More precisely, we propose a generalized multiscale finite element (GMsFEM) method for the heterogeneous dam problem. The ... More
Symmetry Field Breaking Effects in Sr$_2$RuO$_4$Dec 16 2018In this work, after reviewing the theory of the elastic properties of Strontium ruthenate, an extension suitable to explain the sound speed experiments of Lupien et. al. \protect\cite{lup2} and Clifford et. al. \protect\cite{clif1} is carried out. It ... More
Perfectly matched layers simulation in 2-D VTI mediaJan 02 2019Implementing computational boundary conditions, such as perfectly matched layers PML does have advantages for forwarding modeling of the earth's crust. The mathematical modeling of many physical problems encountered in industrial applications often leads ... More
On finite quotient Aubry set for generic geodesic flowsSep 14 2018Sep 18 2018We study the structure of the Mather and Aubry sets for the family of lagrangians given by the kinetic energy associated to a riemannian metric $ g$ on a closed manifold $ M$. In this case the Euler-Lagrange flow is the geodesic flow of $(M,g)$. We prove ... More
A new framework for Euclidean summary statistics in the neural spike train spaceJun 10 2015Nov 05 2015Statistical analysis and inference on spike trains is one of the central topics in the neural coding. It is of great interest to understand the underlying structure of given neural data. Based on the metric distances between spike trains, recent investigations ... More
Parabolic equations involving Bessel operators and singular integralsFeb 16 2017In this paper we consider the evolution equation $\partial_t u=\Delta_\mu u+f$ and the corresponding Cauchy problem, where $\Delta_\mu$ represents the Bessel operator $\partial_x^2+(\frac{1}{4}-\mu^2)x^{-2}$, for every $\mu>-1$. We establish weighted ... More
Melting of scalar hadrons in an AdS/QCD model modified by a thermal dilatonAug 28 2018We consider an AdS/QCD model at finite temperature with a dilaton field that we call thermal because, in addition to depending on the holographic coordinate, it also depends on temperature. We study two thermal dilatons in this work such that at $T=0$ ... More
Institutional Repository saber.ula.ve: A testimonial perspectiveDec 10 2009In this paper, we describe our decade-long experience of building and operating one of the most active Institutional Repository in the world: www.saber.ula.ve <http://www.saber.ula.ve> (University of the Andes, Merida-Venezuela). In order to share our ... More
Young massive star cluster formation in the Galactic Centre is driven by global gravitational collapse of high-mass molecular cloudsMar 14 2019Young massive clusters (YMCs) are the most compact, high-mass stellar systems still forming at the present day. The precursor clouds to such systems are, however, rare due to their large initial gas mass reservoirs and rapid dispersal timescales due to ... More
A detailed view of a Molecular Cloud in the far outer disk of M33Oct 24 2012The amount of H$_2$ present in spiral galaxies remains uncertain, particularly in the dim outer regions and in low-metallicity environments. We present high-resolution CO(1--0) observations with the Plateau de Bure interferometer of the most distant molecular ... More
Towards open and reproducible multi-instrument analysis in gamma-ray astronomyMar 15 2019The analysis and combination of data from different gamma-ray instruments involves the use of collaboration proprietary software and case-by-case methods. The effort of defining a common data format for high-level data, namely event lists and instrument ... More
'The Brick' is not a brick: A comprehensive study of the structure and dynamics of the Central Molecular Zone cloud G0.253+0.016Feb 07 2019In this paper we provide a comprehensive description of the internal dynamics of G0.253+0.016 (a.k.a. 'the Brick'); one of the most massive and dense molecular clouds in the Galaxy to lack signatures of widespread star formation. As a potential host to ... More
Chemical and Photometric Evolution of Extended Ultraviolet Disks: Optical Spectroscopy of M83 (NGC5236) and NGC4625Feb 12 2007We present the results from the analysis of optical spectra of 31 Halpha-selected regions in the extended UV (XUV) disks of M83 (NGC5236) and NGC4625 recently discovered by GALEX. The spectra were obtained using IMACS at Las Campanas Observatory 6.5m ... More
Carnegie Supernova Project-II: Using Near-Infrared Spectroscopy to determine the location of the outer $^{56}$Ni in Type Ia SupernovaeFeb 26 2019We present the $H$-band wavelength region of thirty post-maximum light near-infrared (NIR) spectra of fourteen transitional and sub-luminous type Ia supernovae (SNe Ia), extending from $+$5d to +20d relative to the epoch of $B$-band maximum. We introduce ... More
Low EUV Luminosities Impinging on Protoplanetary DisksJul 07 2014Aug 25 2014The amount of high-energy stellar radiation reaching the surface of protoplanetary disks is essential to determine their chemistry and physical evolution. Here, we use millimetric and centimetric radio data to constrain the EUV luminosity impinging on ... More
The Carnegie Supernova Project: Absolute Calibration and the Hubble ConstantSep 17 2018Sep 19 2018We present an analysis of the final data release of the Carnegie Supernova Project I, focusing on the absolute calibration of the luminosity-decline-rate relation for Type Ia supernovae (SNeIa) using new intrinsic color relations with respect to the color-stretch ... More
Generic Mañé setsOct 27 2014Oct 29 2014We prove that $C^2$ generic hyperbolic Ma\~n\'e sets contain a periodic orbit. In dimesion 2, adding a result with A. Figalli and L. Rifford, we obtain Ma\~n\'e's Conjecture for surfaces in the $C^2$ topology.
Phase diagrams in nonlocal PNJL models constrained by Lattice QCD resultsJul 20 2012Dec 30 2013Based on lattice QCD-adjusted SU(2) nonlocal Polyakov--Nambu--Jona-Lasinio (PNJL) models, we investigate how the location of the critical endpoint in the QCD phase diagram depends on the strenght of the vector meson coupling, as well as the Polyakov-loop ... More
Non-local fractional derivatives. Discrete and continuousMay 23 2016We prove maximum and comparison principles for fractional discrete derivatives in the integers. Regularity results when the space is a mesh of length $h$, and approximation theorems to the continuous fractional derivatives are shown. When the functions ... More
Scale-dependent planar Anti-de Sitter black holeJan 11 2019In this work, we investigate four-dimensional planar black hole solutions in anti-de Sitter spacetimes in light of the so-called scale-dependent scenario. To obtain this new family of solutions, the classical couplings of the theory, i.e., the gravitational ... More
Scale-dependent (2+1) - dimensional electrically charged black holes in Einstein-power-Maxwell theoryJul 20 2018Jul 24 2018In this work we extend and generalize our previous work on the scale dependence at the level of the effective action of black holes in the presence of non-linear electrodynamics. In particular, we consider the Einstein-power-Maxwell theory without a cosmological ... More
Cosmic web alignments with the shape, angular momentum and peculiar velocities of dark matter haloesJun 02 2014Jul 02 2014We study the alignment of dark matter haloes with the cosmic web characterized by the tidal and velocity shear fields. We focus on the alignment of their shape, angular momentum and peculiar velocities. We use a cosmological N-body simulation that allows ... More
Semantic Code BrowsingAug 08 2016Programmers currently enjoy access to a very high number of code repositories and libraries of ever increasing size. The ensuing potential for reuse is however hampered by the fact that searching within all this code becomes an increasingly difficult ... More
A numerical calculation of the electronic specific heat for the compound Sr$_2$RuO$_4$ below its superconducting transition temperatureDec 16 2018In this work, a numerical study of the superconducting specific heat of the unconventional multiband superconductor Strontium Ruthenate is performed. Two band gaps models are employed, and the results rendered for each of them are compared. One of the ... More
Relevance of the fluorescence radiation in VHE gamma-ray observations with the Cherenkov techniqueJun 12 2018Dec 05 2018Atmospheric fluorescence is usually neglected in the reconstruction of the signals registered by Cherenkov telescopes, both IACTs and wide-angle detector arrays. In this paper we quantify the fluorescence contribution to the total light recorded in typical ... More
A comparison of Euclidean metrics and their application in statistical inferences in the spike train spaceFeb 03 2014Jun 10 2015Statistical analysis and inferences on spike trains are one of the central topics in neural coding. It is of great interest to understand the underlying distribution and geometric structure of given spike train data. However, a fundamental obstacle is ... More
DGLAP evolution for DIS diffraction production of high massesJun 26 2018In this paper we develop the DGLAP evolution for the system of produced gluons in the process of diffractive production in DIS, directly from the evolution equation in Color Glass Condensate approach. We are able to describe the available experimental ... More
Damping of sound waves by bulk viscosity in reacting gasesDec 16 2018The very long standing problem of sound waves propagation in fluids is reexamined. In particular, from the analysis of the wave damping in reacting gases following the work of Einsten \citep{Ein}, it is found that the damping due to the chemical reactions ... More
Backward orbits and petals of semigroups of holomorphic self-maps of the unit discApr 25 2018We study the backward invariant set of one-parameter semigroups of holomorphic self-maps of the unit disc. Such a set is foliated in maximal invariant curves and its open connected components are petals, which are, in fact, images of Poggi-Corradini's ... More
A Degenerate Isoperimetric Problem and Traveling Waves to a Bi-stable Hamiltonian SystemApr 02 2015Sep 12 2015We analyze a non-standard isoperimetric problem in the plane associated with a metric having degenerate conformal factor at two points. Under certain assumptions on the conformal factor, we establish the existence of curves of least length under a constraint ... More
Discriminant functions arising from selection distributions: theory and simulationJun 01 2014The assumption of normality in data has been considered in the field of statistical analysis for a long time. However, in many practical situations, this assumption is clearly unrealistic. It has recently been suggested that the use of distributions indexed ... More
An Approach to Incremental and Modular Context-sensitive AnalysisApr 05 2018Jul 02 2018Context-sensitive global analysis of large code bases can be expensive, which can be specially problematic in interactive uses of analyzers. However, in practice each development iteration implies small modifications which are often isolated within a ... More
On the Königs function of semigroups of holomorphic self-maps of the unit discApr 27 2018Let $(\phi_t)$ be a semigroup of holomorphic self-maps of~$\mathbb D$. In this note, we use an abstract approach to define the K\"onigs function of $(\phi_t)$ and "holomorphic models" and show how to deduce the existence and properties of the infinitesimal ... More
Alternating Hamiltonian cycles in $2$-edge-colored multigraphsOct 10 2018A path (cycle) in a $c$-edge-colored multigraph is alternating if no two consecutive edges have the same color. The problem of determining the existence of alternating Hamiltonian paths and cycles in $2$-edge-colored multigraphs is an $\mathcal{NP}$-complete ... More
Cultural Evolution of CategorizationMar 18 2018Jul 05 2018Categorization is a fundamental function of minds, with wide ranging implications for the rest of the cognitive system. In humans, categories are shared and communicated between minds, thus requiring explanations at the population level. In this paper, ... More
A resource theory of entanglement with a unique multipartite maximally entangled stateJul 30 2018Entanglement theory is formulated as a quantum resource theory in which the free operations are local operations and classical communication (LOCC). This defines a partial order among bipartite pure states that makes it possible to identify a maximally ... More
Modulus of continuity of averages of SRB measures for a transversal family of piecewise expanding unimodal mapsApr 12 2016Let $f_t:[0,1] \to [0,1]$ be a family of piecewise expanding unimodal maps with a common critical point that is dense for almost all $t \in [a,b]$. If $\mu_t$ is the corresponding SRB measure for $f_t$, we study the regularity of $\Gamma(t)=\int \phi ... More
Ground States are generically a Periodic OrbitJul 01 2013May 29 2015We prove that for an expanding transformation the maximizing measures of a generic Lipschitz function are supported on a single periodic orbit.
Homogenization on manifoldsDec 28 2014We present a theorem by Contreras, Iturriaga and Siconolfi in which we give a setting to generalize the homogenization of the Hamilton-Jacobi equation from tori to other manifolds.
Gravitational decoupling in $2+1$ dimensional space--times with cosmological termJan 02 2019In this work we implement the Minimal Geometric Deformation method to obtain the isotropic sector and the decoupler matter content of any anisotropic solution of the Einstein field equations with cosmological constant in $2+1$ dimensional space--times. ... More
Minimal Geometric Deformation: the inverse problemJul 09 2018Sep 14 2018In this paper we show that any static and spherically symmetric anisotropic solution of the Einstein field equations can be thought as a system sourced by certain deformed isotropic system in the context of Minimal Geometric Deformation-decoupling approach. ... More
Slope problem for trajectories of holomorphic semigroups in the unit discJun 13 2014It has been an open problem for about ten years whether every trajectory of a parabolic one-parameter semigroup in the unit disk tends to the Denjoy-Wolff point with a definite (and common for all trajectories) slope. In this paper, we give the negative ... More
Boundary regular fixed points in Loewner theoryMar 21 2013We characterize regular fixed points of evolution families in terms of analytical properties of the associated Herglotz vector fields and geometrical properties of the associated Loewner chains. We present several examples showing the r\^ole of the given ... More
Semigroups versus evolution families in the Loewner theoryJul 24 2009We show that an evolution family of the unit disc is commuting if and only if the associated Herglotz vector field has separated variables. This is the case if and only if the evolution family comes from a semigroup of holomorphic self-maps of the disc. ... More
Piecewise Analytic Subactions for Analytic DynamicsApr 22 2009Jan 19 2011We consider a piecewise analytic expanding map f: [0,1]-> [0,1] of degree d which preserves orientation, and an analytic positive potential g: [0,1] -> R. We address the analysis of the following problem: for a given analytic potential beta log g, where ... More
Non-tangential limits and the slope of trajectories of holomorphic semigroups of the unit discApr 16 2018May 10 2018Let $\Delta\subsetneq \mathbb C$ be a simply connected domain, let $f:\mathbb D \to \Delta$ be a Riemann map and let $\{z_k\}\subset \Delta$ be a compactly divergent sequence. Using Gromov's hyperbolicity theory, we show that $\{f^{-1}(z_k)\}$ converges ... More
The Palais-Smale condition for contact type energy levels for convex lagrangian systemsApr 17 2003Mar 29 2004We prove that for a uniformly convex Lagrangian system L on a compact manifold M, almost all energy levels contain a periodic orbit. We also prove that below Ma ne's critical value of the lift of the Lagrangian to the universal cover, almost all energy ... More
Algebraic and qualitative remarks about the family $yy'= (α x^{m+k-1} + βx^{m-k-1})y + γx^{2m-2k-1}$Jul 10 2018Sep 26 2018The aim of this paper is the analysis, from algebraic and qualitative point of view, of the 5-parametric family of differential equations \begin{equation*}\label{folpz} yy'=(\alpha x^{m+k-1}+\beta x^{m-k-1})y+\gamma x^{2m-2k-1}, \quad y'=\frac{dy}{dx} ... More
Ground States are generically a Periodic OrbitJul 01 2013Dec 29 2018We prove that for an expanding transformation the maximizing measures of a generic Lipschitz function are supported on a single periodic orbit.
Light Pseudoscalar and Axial Spectroscopy using AdS/QCD Modified Soft Wall ModelNov 26 2018We study light pseudoscalar and axial states using a soft wall model that is modified by introducing two extra parameters: an UV-cutoff and an anomalous term in the conformal dimension of the fields involved such that meson fields with different parities ... More
CGC/saturation approach: an impact-parameter dependent model for diffraction production in DISFeb 18 2018In the paper we discussed the evolution equations for diffractive production in the framework of CGC/saturation approach, and found the analytical solutions for several kinematic regions. The most impressive features of these solutions are, that diffractive ... More
Type II supernova spectral diversity I: Observations, sample characterization and spectral line evolutionSep 07 2017We present 888 visual-wavelength spectra of 122 nearby type II supernovae (SNe II) obtained between 1986 and 2009, and ranging between 3 and 363 days post explosion. In this first paper, we outline our observations and data reduction techniques, together ... More
The Carnegie Supernova Project I: Third Photometry Data Release of Low-Redshift Type Ia Supernovae and Other White Dwarf ExplosionsSep 15 2017Nov 07 2017We present final natural system optical (ugriBV) and near-infrared (YJH) photometry of 134 supernovae (SNe) with probable white dwarf progenitors that were observed in 2004-2009 as part of the first stage of the Carnegie Supernova Project (CSP-I). The ... More
Active Galactic Nuclei under the scrutiny of CTAApr 10 2013Active Galactic Nuclei (hereafter AGN) produce powerful outflows which offer excellent conditions for efficient particle acceleration in internal and external shocks, turbulence, and magnetic reconnection events. The jets as well as particle accelerating ... More
Environmental effects on galaxy evolution. II: quantifying the tidal features in NIR-images of the cluster Abell 85Sep 19 2017This work is part of a series of papers devoted to investigate the evolution of cluster galaxies during their infall. In the present article we imaged in NIR a selected sample of galaxies through- out the massive cluster Abell 85 (z = 0.055). We obtained ... More
Complete set of translation invariant measurements with Lipschitz boundsMar 07 2019In image and audio signal classification, a major problem is to build stable representations that are invariant under rigid motions and, more generally, to small diffeomorphisms. Translation invariant representations of signals in $\mathbb{C}^n$ are of ... More
First critical field of highly anisotropic three-dimensional superconductors via a vortex density modelJan 07 2019We analyze a mean field model for $3$d anisotropic superconductors with a layered structure, in the presence of a strong magnetic field. The mean field model arises as the $Gamma$-limit of the Lawrence-Doniach energy in certain regimes. A reformulation ... More
Singular perturbation of manifold-valued maps with anisotropic energySep 13 2018We study minimizers of a family of functionals $E_\varepsilon$ indexed by a characteristic length scale $\varepsilon$, whose formal limit is $E_\star(u)=\int W(\nabla u)$ for $u$ taking values into a manifold, where $W$ is a positive definite quadratic ... More
Fast simulation of a HERA--like detectorOct 28 1997A set of FORTRAN routines to perform a fast simulation of a HERA--like detector including the smearing of the $z$ coordinate of the interaction vertex, the simulation of a tracker system, of an electromagnetic and of a hadronic calorimeter is presented. ... More
Small $x$ gluon shadowing from LHC data on coherent $\mathrm{J/}ψ$ photoproductionOct 07 2016We present a novel method to extract the coherent $\mathrm{J/}\psi$ photoproduction cross section, $\sigma_{\gamma \rm Pb}$, from measurements of peripheral and ultra-peripheral Pb-Pb collisions at the LHC. This method allows to access the contribution ... More
Anisotropic shear stress $σ_{xy}$ effects in the basal plane of Sr$_2$RuO$_4$Jan 08 2019Jan 13 2019In this short note, we calculate the jumps for the specific heat C$_{\sigma_{xy}}$, the elastic compliance S$_{xyxy}^{\sigma_{xy}}$ and the thermal expansion $\alpha_{\sigma_{xy}}$ due to a shear stress $\sigma_{xy}$ in the basal plane of $Sr_2RuO_4$. ... More
The Graph Laplacian and Morse InequalitiesApr 26 2017The objective of this note is to provide an interpretation of the discrete version of Morse inequalities, following Witten's approach via supersymmetric quantum mechanics, adapted to finite graphs, as a particular instance of Morse-Witten theory for cell ... More
Fast redshift clustering with the Baire (ultra) metricApr 20 2011The Baire metric induces an ultrametric on a dataset and is of linear computational complexity, contrasted with the standard quadratic time agglomerative hierarchical clustering algorithm. We apply the Baire distance to spectrometric and photometric redshifts ... More
Extended gravitational decoupling in $2+1$ dimensional space--timesFeb 25 2019Mar 05 2019In this work we extend the so--called Minimal Geometric Deformation method in $2+1$ dimensional space--times with cosmological constant. We obtain that the conditions for gravitational decoupling of two circularly symmetric sources coincides with those ... More
Water vapour pressure as determining control parameter to fabricate high efficiency perovskite solar cells at ambient conditionsFeb 12 2019Although perovskite solar cells have demonstrated impressive efficiencies in research labs (above 23%), there is a need of experimental procedures that allow their fabrication at ambient conditions, which would decrease substantially manufacturing costs. ... More
Characterizing the properties of cluster precursors in the MALT90 surveyNov 29 2016In the Milky Way there are thousands of stellar clusters each harboring from a hundred to a million stars. Although clusters are common, the initial conditions of cluster formation are still not well understood. To determine the processes involved in ... More
Deep learning for conifer/deciduous classification of airborne LiDAR 3D point clouds representing individual treesFeb 24 2018The purpose of this study was to investigate the use of deep learning for coniferous/deciduous classification of individual trees from airborne LiDAR data. To enable efficient processing by a deep convolutional neural network (CNN), we designed two discrete ... More
Purification HamiltoniansMar 13 2019We study the Jaynes-Cummings interaction when initial mixed states, for the atom or the field, are considered. The evolved mixed field density matrix is purified to a wavefunction that describes the interaction between a quantised field and an artificial ... More
Credit allocation based on journal impact factor and coauthorship contributionMay 08 2016Some research institutions demand researchers to distribute the incomes they earn from publishing papers to their researchers and/or co-authors. In this study, we deal with the Impact Factor-based ranking journal as a criteria for the correct distribution ... More
A note on the spin connection representation of gravityApr 06 1999The formulation of gravity in 3+1 dimensions in which the spin connection is the basic field ($\omega $-frame) leads to a theory with first and second class constraints. Here, the Dirac brackets for the second class constraints are evaluated and the Dirac ... More
Extended gravitational decoupling in $2+1$ dimensional space--timesFeb 25 2019In this work we extend the so--called Minimal Geometric Deformation method in $2+1$ dimensional space--times with cosmological constant. We obtain that the conditions for gravitational decoupling of two circularly symmetric sources coincides with those ... More
Borromean surgery equivalence of spin 3-manifolds with boundaryFeb 21 2013Jul 08 2013Matveev introduced Borromean surgery on 3-manifolds, and proved that the equivalence relation on closed, oriented 3-manifolds generated by Borromean surgeries is characterized by the first homology group and the torsion linking pairing. Massuyeau generalized ... More
Scale--dependent Hayward black hole and the generalized uncertainty principleSep 04 2018Sep 14 2018In this work we present a technique to obtain bounds on the generalized uncertainty principle deformation parameter by using an improved Schwarzschild solution represented by the Hayward metric in the context of scale--dependent gravity. Specifically, ... More
The overlooked role of stellar variability in the extended main sequence of LMC intermediate-age clustersOct 21 2016Intermediate-age star clusters in the Large Magellanic Cloud show extended main sequence turn offs (MSTOs), which are not consistent with a canonical single stellar population. These broad turn offs have been interpreted as evidence for extended star ... More
Anisotropic shear stress $σ_{xy}$ effects in the basal plane of Sr$_2$RuO$_4$Jan 08 2019Feb 17 2019In this short note, we repeat the calculations the jumps for the specific heat C$_{\sigma_{xy}}$, the elastic compliance S$_{xyxy}^{\sigma_{xy}}$ and the thermal expansion $\alpha_{\sigma_{xy}}$ due to a shear stress $\sigma_{xy}$ in the basal plane of ... More
Environmental conditions shaping star formation: The Carina NebulaNov 17 2018Using the Mopra telescope, we have targeted 61 regions in the Carina Nebula, covering an area of 1.5 square degrees, of bright and compact 870 $\mu$m dust continuum emission for molecular line emission from a host of 16 spectral lines at 3mm, including ... More
Multi-Lepton Signals of the Higgs BosonDec 10 2011The possibility of searching for the Higgs boson in channels with multiple non-resonant leptons is evaluated in light of recent advances in multi-lepton search techniques at the LHC. The total multi-lepton Higgs signal exceeds the four lepton gold-plated ... More
Hadronic Spectra from a Deformed AdS BackgroundMar 14 2019Starting from a deformed $AdS_5$ space due to the presence of a modified warp factor in the metric tensor of such space, we use the AdS/CFT correspondence within this model to calculate the spectra for even and odd glueballs, scalar and vector mesons, ... More
ATLASGAL --- Complete compact source catalogue: 280\degr\ $ <\ell <$ 60\degrJun 22 2014The APEX Telescope Large Area Survey of the Galaxy (ATLASGAL) is the largest and most sensitive systematic survey of the inner Galactic plane in the submillimetre wavelength regime. The observations were carried out with the Large APEX Bolometer Camera ... More
Large vorticity stable solutions to the Ginzburg-Landau equationsSep 08 2011We construct local minimizers to the Ginzburg-Landau functional of superconductivity whose number of vortices N is prescribed and blows up as the parameter epsilon, inverse of the Ginzburg-Landau parameter kappa, tends to zero. We treat the case of N ... More