Results for "Tibério de Paula Netto"

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Stochastic quantization of a self-interacting nonminimal scalar field in semiclassical gravityApr 12 2018Apr 19 2018We employ stochastic quantization for a self-interacting nonminimal massive scalar field in curved spacetime. The covariant background field method and local momentum space representation are used to obtain the Euclidean correlation function and evaluate ... More
Form factors and decoupling of matter fields in four-dimensional gravityDec 02 2018Jan 31 2019We extend previous calculations of the non-local form factors of semiclassical gravity in $4D$ to include the Einstein-Hilbert term. The quantized fields are massive scalar, fermion and vector fields. The non-local form factor in this case can be seen ... More
Vacuum effective actions and mass-dependent renormalization in curved spaceFeb 08 2019We review past and present results on the non-local form-factors of the effective action of semiclassical gravity in two and four dimensions computed by means of a covariant expansion of the heat kernel up to the second order in the curvatures. We discuss ... More
Massive vector field on curved background: non-minimal coupling, quantization and divergencesMar 01 2017Apr 03 2017We study the effective action for the massive vector field theory non-minimally coupled to external gravitational field. Such a theory is an interesting model both from the theoretical side and also due to the various phenomenological applications to ... More
Vacuum effective actions and mass-dependent renormalization in curved spaceFeb 08 2019Mar 02 2019We review past and present results on the non-local form-factors of the effective action of semiclassical gravity in two and four dimensions computed by means of a covariant expansion of the heat kernel up to the second order in the curvatures. We discuss ... More
On Newtonian singularities in higher derivative gravity modelsDec 01 2014Nov 10 2015We consider the problem of Newtonian singularity in the wide class of higher derivative gravity models, including the ones which are renormalizable and super-renormalizable at the quantum level. The simplest version of the singularity-free theory has ... More
Analytic properties of bivariate representation and conjugacy class zeta functions of finitely generated nilpotent groupsJul 15 2018Let $\mathbf{G}$ be a unipotent group scheme defined in terms of a nilpotent Lie lattice over the ring $\mathcal{O}$ of integers of a number field. We consider bivariate zeta functions of groups of the form $\mathbf{G}(\mathcal{O})$ encoding, respectively, ... More
Bivariate representation and conjugacy class zeta functions associated to unipotent group schemes, I: Arithmetic propertiesFeb 13 2018May 05 2018This is the first of two papers in which we introduce and study two bivariate zeta functions associated to unipotent group schemes over rings of integers of number fields. These zeta functions encode, respectively, the numbers of isomorphism classes of ... More
Non-local form factors for curved-space antisymmetric fieldsMay 21 2016Jul 09 2016In the recent paper Buchbinder, Kirillova and Pletnev presented formal arguments concerning quantum equivalence of free massive antisymmetric tensor fields of second and third rank to the free Proca theory and massive scalar field with minimal coupling ... More
One-loop divergences in the Galileon modelJul 02 2012Sep 03 2012The investigation of UV divergences is a relevant step in better understanding of a new theory. In this work the one-loop divergences in the free field sector are obtained for the popular Galileons model. The calculations are performed by the generalized ... More
Vacuum contribution of photons in the theory with Lorentz and CPT-violating termsMar 13 2014The photon contribution to the divergences and conformal anomaly in the theory with Lorentz and CPT-violating terms is evaluated. We calculate one-loop counterterms coming from the integration over electromagnetic field and check that they possess local ... More
Deep surface photometry of edge-on spirals in Abell galaxy clusters: constraining environmental effectsApr 29 2008There is a clear scarcity of structural parameters for stellar thick discs, especially for spiral galaxies located in high-density regions, such as galaxy clusters and compact groups. We have modelled the thin and thick discs of 4 edge-on spirals located ... More
Spherical collapse of small masses in the ghost-free gravityApr 01 2015May 20 2015We discuss some properties of recently proposed models of a ghost-free gravity. For this purpose we study solutions of linearized gravitational equations in the framework of such a theory. We mainly focus on the version of the ghost-free theory with the ... More
Interwoven limit cycles in the spectra of mass imbalanced many-boson systemMar 25 2019The independence between few-body scales beyond the van der Waals universality is demonstrated for the extreme mass-imbalanced case of a specific many-boson system. This finding generalizes the scaling properties of universal tetramers to a broader class ... More
Immittance response of an electrolytic cell in the presence of adsorption, generation, and recombination of ionsApr 01 2012Effects of the adsorption-desorption process on the immittance response of an electrolytic cell are theoretically investigated in the framework of the diffusional Poisson-Nernst-Planck (PNP) continuum model, when the generation and recombination of ions ... More
Shielding Property in Higher DimensionsJan 23 2019When the reduced state of a many-body quantum system is independent of its remaining parts, we say it shows what has become known by shielding property. Under some assumptions, equilibrium states of quantum transverse Ising models do manifest such phenomenon. ... More
A connection between anomalous Poisson-Nernst-Planck models and equivalent circuits with constant--phase elementsJun 08 2013A connection between the impedance spectroscopy response of anomalous Poisson-Nernst-Planck (PNPA) diffusional models and of equivalent circuits containing constant phase elements (CPE) is established for a typical electrolytic cell. The analysis is carried ... More
Toeplitz operators on Bergman spaces of polygonal domainsAug 09 2018We study the boundedness of Toeplitz operators with locally integrable symbols on Bergman spaces $A^p(\Omega),$ $1<p<\infty,$ where $\Omega\subset \mathbb{C}$ is a bounded simply connected domain with polygonal boundary. We give sufficient conditions ... More
Irreversibility at zero temperature from the perspective of the environemntApr 09 2018Apr 16 2018We address the emergence of entropy production in the non-equilibrium process of an open quantum system from the viewpoint of the environment. By making use of a dilation-based approach akin to Stinespring theorem, we derive an expression for the entropy ... More
Loop Quantum Gravity Immirzi parameter and the Kaniadakis statisticsJul 31 2018In this letter we have shown that a possible connection between the LQG Immirzi parameter and the area of a punctured surface can emerge depending on the thermostatistics theory previously chosen. Starting from the Boltzmann-Gibbs entropy, the Immirzi ... More
ABMS of social network based on affinityFeb 28 2019An agent-based model is proposed for analyzing the dynamics that arise from interactions within social networks, analyzing the individual behavior of each profile. Said model considers a simplified construction of a social network while satisfying properties ... More
From stable to unstable anomaly-induced inflationSep 29 2015Sep 21 2016Quantum effects derived through conformal anomaly lead to an inflationary model that can be either stable or unstable. The unstable version requires a large dimensionless coefficient of about $5\times 10^8$ in front of the $R^2$ term that results in the ... More
Investigation of the WR 11 field at decimeter wavelengthsMar 25 2019The massive binary system WR11 has been recently proposed as the counterpart of a Fermi source. If correct, it would be the second colliding wind binary detected in GeV gamma-rays. However, the reported flux measurements from 1.4 to 8.64GHz fail to establish ... More
Comparison of Volumes of Siegel Sets and Fundamental Domains of $\mathrm{SL}_n(\mathbb{Z})$Apr 12 2016Mar 23 2018The purpose of this paper is to calculate explicitly the volumes of Siegel sets which are coarse fundamental domains for the action of $\mathrm{SL}_n (\mathbb{Z})$ in $\mathrm{SL}_n (\mathbb{R})$, so that we can compare these volumes with those of the ... More
Comparison of Volumes of Siegel Sets and Fundamental Domains of $\mathrm{SL}_n(\mathbb{Z})$Apr 12 2016Oct 13 2016The purpose of this paper is to calculate explicitly the volume of Siegel sets for $\mathrm{SL} _n (\mathbb{Z})$ in $\mathrm{SL} _n (\mathbb{R})$, so that we can compare this volume with the volume of fundamental domains of $\mathrm{SL} _n (\mathbb{Z})$ ... More
White dwarf and subdwarf stars in the Sloan Digital Sky Survey Data Release 14Apr 02 2019White dwarfs carry information on the structure and evolution of the Galaxy, especially through their luminosity function and initial-to-final mass relation. Very cool white dwarfs provide insight into the early ages of each population. Examining the ... More
A Phenomenological Model for the Light Curve of three Quiescent Low-inclination Dwarf Novae and one Pre-Cataclysmic VariableAug 19 2018We used the light curve code XRBinary to model the quiescent K2 light curves of three low-inclination cataclysmic variables (CVs): 1RXS\,J0632+2536 (J0632+2536), RZ\,Leo, TW\,Vir and the pre-CV WD\,1144+011. Optimized light curve models were obtained ... More
The Generic Degree of AutonomyMay 18 2018Aug 27 2018This paper calculates the degree of autonomy of a generic autonomous n-D system given by the kernel of a partial difference operator. The calculation implies that attaching a generic controller to a non-autonomous system, results in a controlled system ... More
Slow and Ordinary Provability for Peano ArithmeticFeb 04 2016Jun 06 2016The notion of slow provability for Peano Arithmetic ($\mathsf{PA}$) was introduced by S.D. Friedman, M. Rathjen, and A. Weiermann. They studied the slow consistency statement $\mathrm{Con}_{\mathsf{s}}$ that asserts that a contradiction is not slow provable ... More
Hyperbolic distribution problems on Siegel 3-folds and Hilbert modular varietiesFeb 24 2005We generalize to Hilbert modular varieties of arbitrary dimension the work of W. Duke (Inventiones 1988) on the equidistribution of Heegner points and of primitive positively oriented closed geodesics in the Poincare upper half plane, subject to certain ... More
White dwarf and subdwarf stars in the Sloan Digital Sky Survey Data Release 14Apr 02 2019Apr 13 2019White dwarfs carry information on the structure and evolution of the Galaxy, especially through their luminosity function and initial-to-final mass relation. Very cool white dwarfs provide insight into the early ages of each population. Examining the ... More
HPC Cloud for Scientific and Business Applications: Taxonomy, Vision, and Research ChallengesOct 24 2017Feb 02 2018High Performance Computing (HPC) clouds are becoming an alternative to on-premise clusters for executing scientific applications and business analytics services. Most research efforts in HPC cloud aim to understand the cost-benefit of moving resource-intensive ... More
DeepDownscale: a Deep Learning Strategy for High-Resolution Weather ForecastAug 15 2018Running high-resolution physical models is computationally expensive and essential for many disciplines. Agriculture, transportation, and energy are sectors that depend on high-resolution weather models, which typically consume many hours of large High ... More
Job Placement Advisor Based on Turnaround Predictions for HPC Hybrid CloudsAug 22 2016Aug 26 2016Several companies and research institutes are moving their CPU-intensive applications to hybrid High Performance Computing (HPC) cloud environments. Such a shift depends on the creation of software systems that help users decide where a job should be ... More
Helping HPC Users Specify Job Memory Requirements via Machine LearningNov 09 2016Resource allocation in High Performance Computing (HPC) settings is still not easy for end-users due to the wide variety of application and environment configuration options. Users have difficulties to estimate the number of processors and amount of memory ... More
Stellar activity and rotation of the planet host Kepler-17 from long-term space-borne photometryApr 09 2019The study of young Sun-like stars is of fundamental importance to understand the magnetic activity and rotational evolution of the Sun. Space-borne photometry by the Kepler telescope provides unprecedented datasets to investigate these phenomena in Sun-like ... More
Characteristic-free resolutions of Weyl and Specht modulesApr 11 2011Apr 19 2011We construct explicit resolutions of Weyl modules by divided powers and of co-Specht modules by permutational modules. We also prove a conjecture of Boltje-Hartmann on resolutions of co-Specht modules.
Transcendence Measures for some $U_m$-numbers related to Liouville's constantOct 19 2009In this note, we shall prove that the sum and the product of an algebraic number $\alpha$ by the \textit{Liouville constant} $L=\sum_{j=1}^{\infty}10^{-j!}$ is a $U$-number with type equals to the degree of $\alpha$ (with respect to $\mathbb{Q}$). Moreover, ... More
FOCCoS for Subaru PFSOct 09 2012The Fiber Optical Cable and Connector System (FOCCoS), provides optical connection between 2400 positioners and a set of spectrographs by an optical fibers cable as part of Subaru PFS instrument. Each positioner retains one fiber entrance attached at ... More
Derived categories of functors and Fourier--Mukai transform for quiver sheavesSep 19 2012Let C be small category and A an arbitrary category. Consider the category C(A) whose objects are functors from C to A, and whose morphisms are natural transformations. Given a functor F : A --> B one obtains an induced functor F_C : C(A) --> C(B) . If ... More
Nonlinear dark-field imaging of 1D defects in monolayer dichalcogenidesMar 12 2019Extended defects with one dimensionality smaller than that of the host, such as 2D grain boundaries in 3D materials or 1D grain boundaries in 2D materials, can be particularly damaging since they directly impede the transport of charge, spin or heat, ... More
Akivis Superalgebras and specialityOct 24 2007In this paper we define Akivis superalgebra and study enveloping superalgebras for this class of algebras, proving an analogous of the PBW Theorem. Lie and Malcev superalgebras are examples of Akivis superalgebras. For these particular superalgebras, ... More
Helium ordered trapping in arsenolite under compression: Synthesis of He2As4O6Feb 15 2015The compression of arsenolite (cubic As2O3) has been studied from a joint experimental and theoretical point of view. Experimental X-ray diffraction and Raman scattering measurements of this molecular solid at high pressures with different pressure-transmitting ... More
Landscape of an exact energy functionalJun 07 2015Apr 08 2016One of the great challenges of electronic structure theory is the quest for the exact functional of density functional theory. Its existence is proven, but it is a complicated multivariable functional that is almost impossible to conceptualize. In this ... More
Photoinduced Floquet topological magnons in Kitaev magnetsFeb 20 2019We study periodically driven pure Kitaev model and ferromagnetic phase of the Kitaev-Heisenberg model on the honeycomb lattice by off-resonant linearly and circularly-polarized lights at zero magnetic field. Using a combination of linear spin wave and ... More
Multi-Gbps HTTP Traffic Analysis in Commodity Hardware Based on Local Knowledge of TCP StreamsJan 17 2017In this paper we propose and implement novel techniques for performance evaluation of web traffic (response time, response code, etc.), with no reassembly of the underlying TCP connection, which severely restricts the traffic analysis throughput. Furthermore, ... More
Clustering of high values in random fieldsSep 02 2015The asymptotic results that underlie applications of extreme random fields often assume that the variables are located on a regular discrete grid, identified with $\mathbb{Z}^2$, and that they satisfy stationarity and isotropy conditions. Here we extend ... More
Hermite Polynomials in Dunkl-Clifford AnalysisFeb 10 2011In this paper we present a generalization of the classical Hermite polynomials to the framework of Clifford-Dunkl operators. Several basic properties, such as orthogonality relations, recurrence formulae and associated differential equations, are established. ... More
Double-Recurrence Fibonacci Numbers and GeneralizationsMar 18 2019Let $(F_n)_{n\geq 0}$ be the Fibonacci sequence given by the recurrence $F_{n+2}=F_{n+1}+F_n$, for $n\geq 0$, where $F_0=0$ and $F_1=1$. There are several generalizations of this sequence and also several interesting identities. In this paper, we investigate ... More
Electronic excitation by short X-ray pulses: From quantum beats to wave packet revivalsSep 26 2011We propose a simple way to determine the periodicities of wave packets in quantum systems directly from the energy differences of the states involved. The resulting classical periods and revival times are more accurate than those obtained with the traditional ... More
Applications of parabolic Dirac operators to the instationary viscous MHD equations on conformally flat manifoldsApr 24 2018In this paper we apply classical and recent techniques from quaternionic analysis using parabolic Dirac type operators and related Teodorescu and Cauchy-Bitzadse type operators to set up some analytic representation formulas for the solutions to the time ... More
Stratifying systems over the hereditary path algebra with quiver $\mathbb{A}_{p,q}$Nov 18 2015The authors have proved in [J. Algebra Appl. 14 (2015), no. 6] that the size of a stratifying system over a finite-dimensional hereditary path algebra $A$ is at most $n$, where $n$ is the number of isomorphism classes of simple $A$-modules. Moreover, ... More
Homological properties of quantised Borel-Schur algebras and resolutions of quantised Weyl modulesApr 17 2013We continue the development of the homological theory of quantum general linear groups previously considered by the first author. The development is used to transfer information to the representation theory of quantised Schur algebras. The acyclicity ... More
Wang-Landau sampling: Improving accuracyOct 20 2011Dec 20 2011In this work we investigate the behavior of the microcanonical and canonical averages of the two-dimensional Ising model during the Wang-Landau simulation. The simulations were carried out using conventional Wang-Landau sampling and the $1/t$ scheme. ... More
Positive Definite Functions on Complex Spheres and their Walks through DimensionsApr 05 2017Nov 08 2017We provide walks through dimensions for isotropic positive definite functions defined over complex spheres. We show that the analogues of Mont\'ee and Descente operators as proposed by Beatson and zu Castell [J. Approx. Theory 221 (2017), 22-37] on the ... More
Geometric phase corrections on a moving particle in front of a dielectric mirrorJul 21 2017We consider an atom (represented by a two-level system) moving in front of a dielectric plate, and study how traces of dissipation and decoherence (both effects induced by vacuum field fluctuations) can be found in the corrections to the unitary geometric ... More
Ages and kinematics of chemically selected, accreted Milky Way halo starsMar 22 2019Mar 25 2019We exploit the [Mg/Mn]-[Al/Fe] chemical abundance plane to help identify nearby halo stars in the 14th data release from the APOGEE survey that have been accreted on to the Milky Way. Applying a Gaussian Mixture Model, we find a `blob' of 856 likely accreted ... More
An O(a) modified lattice set-up of the Schrödinger functional in SU(3) gauge theoryApr 30 2011Jan 18 2012The set-up of the QCD Schr\"odinger functional (SF) on the lattice with staggered quarks requires an even number of points $L/a$ in the spatial directions, while the Euclidean time extent of the lattice, $T/a$, must be odd. Identifying a unique renormalisation ... More
Fermi-LAT Observations of Extreme Spectral Variability in IC 310Mar 19 2019We investigate the physical mechanisms of high-energy gamma-ray emission from the TeV-emitting misaligned active galactic nucleus IC 310. Eight years of data from the Fermi Large Area Telescope (Fermi-LAT) between 100 MeV and 500 GeV are reduced and analysed ... More
A Survey of Predictive Modelling under Imbalanced DistributionsMay 07 2015May 13 2015Many real world data mining applications involve obtaining predictive models using data sets with strongly imbalanced distributions of the target variable. Frequently, the least common values of this target variable are associated with events that are ... More
Astro2020 Science White Paper: Understanding the evolution of close white dwarf binariesMar 11 2019Mar 15 2019Interacting binaries containing white dwarfs can lead to a variety of outcomes that range from powerful thermonuclear explosions, which are important in the chemical evolution of galaxies and as cosmological distance estimators, to strong sources of low ... More
Document classification using a Bi-LSTM to unclog Brazil's supreme courtNov 27 2018The Brazilian court system is currently the most clogged up judiciary system in the world. Thousands of lawsuit cases reach the supreme court every day. These cases need to be analyzed in order to be associated to relevant tags and allocated to the right ... More
Evaluation of sentence embeddings in downstream and linguistic probing tasksJun 16 2018Despite the fast developmental pace of new sentence embedding methods, it is still challenging to find comprehensive evaluations of these different techniques. In the past years, we saw significant improvements in the field of sentence embeddings and ... More
The LHCb UpgradeAug 05 2011The LHCb detector at the LHC has shown a very successful initial operation and it is expected that the experiment will accumulate an integrated luminosity in proton-proton collisions of around 1 fb-1 in 2011. The data already collected are being used ... More
Reverberation Mapping of Luminous Quasars at High-zJun 21 2018Jul 27 2018We present Reverberation Mapping (RM) results for 17 high-redshift, high-luminosity quasars with good quality R-band and emission line light curves. We are able to measure statistically significant lags for Ly_alpha (11 objects), SiIV (5 objects), CIV ... More
A Bioimpedance Measurement System for Pulse Wave AnalysisFeb 28 2019The morphology and velocity of the pulse wave in the arteries provide meaningful information about the cardiovascular system. Nowadays, the pulse wave is usually acquired using common blood pressure cuffs at the extremities. This work describes a new ... More
Numerical approach to simulating interference phenomena in a two-oscillating mirrors cavityMar 08 2017We study photon creation in a cavity with two perfectly conducting moving mirrors. We derive the dynamic equations of the modes and study different situations concerning various movements of the walls, such as translational or breathing modes. We can ... More
Migrations, vaccinations and epidemic controlDec 21 2017We consider three regions with different public health conditions. In the absence of migration among these regions, the first two have good health conditions and the disease free state is stable; for the third region, on the other hand, the only stable ... More
Estimating the Upcrossings IndexApr 09 2012For stationary sequences, under general local and asymptotic dependence restrictions, any limiting point process for time normalized upcrossings of high levels is a compound Poisson process, i.e., there is a clustering of high upcrossings, where the underlying ... More
Failure of the random phase approximation correlation energyMar 25 2009The random phase approximation (RPA) to the correlation energy is extended to fractional occupations and its performance examined for exact conditions on fractional charges and fractional spins. RPA satisfies the constancy condition for fractional spins ... More
Characterization theorems for the spaces of derivations of evolution algebras associated to graphsJul 06 2018Nov 03 2018It is well-known that the space of derivations of $n$-dimensional evolution algebras with non-singular matrices is zero. On the other hand, the space of derivations of evolution algebras with matrices of rank $n-1$ has also been completely described in ... More
On the connection between evolution algebras, random walks and graphsJul 18 2017Dec 28 2018Evolution algebras are a new type of non-associative algebras which are inspired from biological phenomena. A special class of such algebras, called Markov evolution algebras, is strongly related to the theory of discrete time Markov chains. The winning ... More
Prime Focus Spectrograph - Subaru's future -Oct 09 2012The Prime Focus Spectrograph (PFS) of the Subaru Measurement of Images and Redshifts (SuMIRe) project has been endorsed by Japanese community as one of the main future instruments of the Subaru 8.2-meter telescope at Mauna Kea, Hawaii. This optical/near-infrared ... More
Comparison of OFDM and SC-DFE Capacities Without Channel Knowledge at the TransmitterJun 14 2013This letter provides a capacity analysis between OFDM and the ideal SC-DFE when no channel knowledge is available at the transmitter. Through some algebraic manipulation of the OFDM and SC-DFE capacities and using the concavity property of the manipulated ... More
Cost effectiveness analysis of optimal control measures for tuberculosisSep 11 2014We propose and analyse an optimal control problem where the control system is a mathematical model for tuberculosis that considers reinfection. The control functions represent the fraction of early latent and persistent latent individuals that are treated. ... More
K2 study of the Magnetic Precataclysmic Variable V1082 SagittariusAug 10 2018We present a long-term light curve of the precataclysmic variable (CV) V1082 Sgr obtained by the K2-mission over the course of 81 days. We analyze the entire complex light curve as well as explore several sections in detail with a sliding periodogram. ... More
Very high energy $γ$-ray emission from RBS 0679Oct 07 2014In this paper we report the \textit{Fermi} Large Area Telescope (LAT) detection of Very High Energy (VHE; $E_{\gamma}>100$ GeV) $\gamma$-ray emission from the BL Lac object RBS 0679. $5.3$ years of LAT observations revealed the presence of three VHE photon ... More
$γ$-ray observations of extraterrestrial neutrino track event positionsMay 05 2015In this paper we report the results of a $\gamma$-ray study of IceCube's extraterrestrial neutrino candidates detected as track-like events. Using 70 months of Fermi-LAT observations, a likelihood analysis of all $1-300$ GeV photons within 5 degrees of ... More
Localising the gamma-ray emission region during the June 2014 outburst of 3C 454.3Jan 26 2016In May - July 2014, the flat spectrum radio quasar 3C 454.3 exhibited strong flaring behaviour. Observations with the Large Area Telescope detector on-board the Fermi Gamma-ray Space Telescope captured the $\gamma$-ray flux at energies 0.1 $\leq E_{\gamma}\leq$ ... More
Localization and delocalization errors in density functional theory and implications for band-gap predictionAug 27 2007The band-gap problem and other systematic failures of approximate functionals are explained from an analysis of total energy for fractional charges. The deviation from the correct intrinsic linear behavior in finite systems leads to delocalization and ... More
Fractional charge perspective on the band-gap in density-functional theoryAug 23 2007The calculation of the band-gap by density-functional theory (DFT) methods is examined by considering the behavior of the energy as a function of number of electrons. It is found that the incorrect band-gap prediction with most approximate functionals ... More
Scalar mesons within a dynamical holographic QCD modelAug 28 2009Oct 25 2010We show that the infrared dynamics of string modes dual to $q\bar q$ states within a Dynamical AdS/QCD model of coupled dilaton-gravity background gives the Reggelike spectrum of $f0's$ scalars and higher spin mesons consistent with experimental data. ... More
Scalar Spectrum from a Dynamical Gravity/Gauge modelApr 05 2010We show that a Dynamical AdS/QCD model is able to reproduce the linear Regge trajectories for the light-flavor sector of mesons with high spin and also for the scalar and pseudoscalar ones. In addition the model has confinement by the Wilson loop criteria ... More
On Exact Symmetries and Massless Vectors in Holographic Flows and other Flux VacuaMar 12 2010We analyze the isometries of Type IIB flux vacua based on the Papadopolous-Tseytlin ansatz and identify the related massless bulk vector fields. To this end we devise a general ansatz, valid in any flux compactification, for the fluctuations of the metric ... More
Hadrons in AdS/QCD modelsFeb 04 2012We discuss applications of gauge/gravity duality to describe the spectrum of light hadrons. We compare two particular 5-dimensional approaches: a model with an infrared deformed Anti-de Sitter metric and another one based on a dynamical AdS/QCD framework ... More
A planetesimal orbiting within the debris disc around a white dwarf starApr 03 2019Many white dwarf stars show signs of having accreted smaller bodies, implying that they may host planetary systems. A small number of these systems contain gaseous debris discs, visible through emission lines. We report a stable 123.4min periodic variation ... More
Activity and rotation of Kepler-17Feb 07 2017Magnetic activity on stars manifests itself in the form of dark spots on the stellar surface, that cause modulation of a few percent in the light curve of the star as it rotates. When a planet eclipses its host star, it might cross in front of one of ... More
Mesonic Spectrum from a Dynamical Gravity/Gauge modelApr 09 2010Within a formulation of a Dynamical AdS/QCD model we calculate the spectrum of light flavored mesons. The background fields of the model correspond to an IR deformed Anti de Sitter metric coupled to a dilaton field. Confinement comes as a consequence ... More
Cooperative spectrum sensing over unreliable reporting channelJun 20 2011This article aims to analyze a cooperative spectrum sensing scheme using a centralized approach with unreliable reporting channel. The spectrum sensing is applied to a cognitive radio system, where each cognitive radio performs a simple energy detection ... More
The Gaia-ESO survey: Hydrogen lines in red giants directly trace stellar massJun 17 2016Red giant stars are perhaps the most important type of stars for Galactic and extra-galactic archaeology: they are luminous, occur in all stellar populations, and their surface temperatures allow precise abundance determinations for many different chemical ... More
Bivariate representation and conjugacy class zeta functions associated to unipotent group schemes, II: Groups of type F, G, and HMay 05 2018This is the second of two papers introducing and investigating two bivariate zeta functions associated to unipotent group schemes over rings of integers of number fields. In the first part, we proved some of their properties such as rationality and functional ... More
Extremal graphs for the sum of the two largest signless Laplacian eigenvaluesOct 31 2013Let G be a simple graph on $n$ vertices and $e(G)$ edges. Consider $Q(G) = D + A$ as the signless Laplacian of $G$, where $A$ is the adjacency matrix and $D$ is the diagonal matrix of the vertices degree of $G$. Let $q_1(G)$ and $q_2(G)$ be the first ... More
Robust Kantorovich's theorem on Newton's method under majorant condition in Riemannian ManifoldsMay 21 2015A robust affine invariant version of Kantorovich's theorem on Newton's method, for finding a zero of a differentiable vector field defined on a complete Riemannian manifold, is presented in this paper. In the analysis presented, the classical Lipschitz ... More
Valley properties of doped graphene in a magnetic fieldFeb 13 2015The aim of this work is to describe the electronic properties of graphene in a constant magnetic field in the long wavelength approximation with random binary disorder, by solving the Soven equation self-consistently. Density of state contributions for ... More
Computational investigation of structure, dynamics and nucleation kinetics of a family of modified Stillinger-Weber model fluids in bulk and free-standing thin filmsOct 26 2015In recent decades, computer simulations have found increasingly widespread use as powerful tools of studying phase transitions in wide variety of systems. In the particular and very important case of aqueous systems, the commonly used force-fields tend ... More
HST and Optical Data on SDSSJ0804+5103 (EZ Lyn) One Year after OutburstMar 08 2013We present an ultraviolet spectrum and light curve of the short orbital period cataclysmic variable EZ Lyn obtained with the Cosmic Origins Spectrograph on the Hubble Space Telescope 14 months after its dwarf nova outburst, along with ground-based optical ... More
How the velvet worm squirts slimeNov 06 2014The rapid squirt of a proteinaceous slime jet endows the ancient velvet worms (Onychophora) with a unique mechanism for defense from predators and for capturing prey by entangling them in a disordered web that immobilizes their target. However, to date ... More
On the description of composite bosons in discrete modelsMar 24 2019The understanding of the behaviour of systems of identical composite bosons has progressed significantly in connection with the analysis of the entanglement between constituents and the development of coboson theory. The basis of these treatments is a ... More
Hierarchical Fragmentation of the Orion Molecular FilamentsNov 29 2012We present a high angular resolution map of 850 um continuum emission of the Orion Molecular Cloud-3 (OMC 3) obtained with the Submillimeter Array (SMA); the map is a mosaic of 85 pointings covering an approximate area of 6'.5 x 2'.0 (0.88 x 0.27 pc). ... More
Diversity of planetary systems in low-mass disks: Terrestrial-type planet formation and water deliveryMay 08 2014Several studies, observational and theoretical, suggest that planetary systems with only rocky planets should be the most common in the Universe. We study the diversity of planetary systems that might form around Sun-like stars in low-mass disks without ... More