Results for "Saida M. Caballero-Nieves"

total 183615took 0.38s
Massive, wide binaries as tracers of massive star formationFeb 13 2018Massive stars can be found in wide (hundreds to thousands AU) binaries with other massive stars. We use $N$-body simulations to show that any bound cluster should always have approximately one massive wide binary: one will probably form if none are present ... More
Black hole radiation with high frequency dispersionMay 11 1999Aug 24 1999We consider one model of a black hole radiation, in which the equation of motion of a matter field is modified to cut off high frequency modes. The spectrum in the model has already been analytically derived in low frequency range, which has resulted ... More
The Survey for Ionization in Neutral-Gas Galaxies: III. Diffuse, Warm Ionized Medium and Escape of Ionizing RadiationMar 01 2007We use the first data release from the SINGG H-alpha survey of HI-selected galaxies to study the quantitative behavior of the diffuse, warm ionized medium (WIM) across the range of properties represented by these 109 galaxies. The mean fraction f_WIM ... More
A dual rigidity of the sphere and the hyperbolic planeMay 20 2015There are several well-known characterizations of the sphere as a regular surface in the Euclidean space. By means of a purely synthetic technique, we get a rigidity result for the sphere without any curvature conditions, nor completeness or compactness. ... More
The Multiplicity of Massive Stars: A High Angular Resolution Survey with the HST Fine Guidance SensorSep 30 2014We present the results of an all-sky survey made with the Fine Guidance Sensor on Hubble Space Telescope to search for angularly resolved binary systems among the massive stars. The sample of 224 stars is comprised mainly of Galactic O- and B-type stars ... More
A Compact Representation for Trips over Networks built on self-indexesDec 28 2018Representing the movements of objects (trips) over a network in a compact way while retaining the capability of exploiting such data effectively is an important challenge of real applications. We present a new Compact Trip Representation (CTR) that handles ... More
Are there three Xi(1950) states?Nov 09 2011Jan 12 2012Different experiments on hadron spectroscopy have long suspected the existence of several cascade states in the $1900-2000 {\rm MeV}$ region. They are usually labeled under the common name of $\Xi (1950)$. As we argue here, there are also theoretical ... More
Using Compressed Suffix-Arrays for a Compact Representation of Temporal-GraphsDec 28 2018Temporal graphs represent binary relationships that change along time. They can model the dynamism of, for example, social and communication networks. Temporal graphs are defined as sets of contacts that are edges tagged with the temporal intervals when ... More
A Short Proof of a Concrete SumApr 12 2016We give an alternative proof of a formula that generalizes Hermite's identity. Instead involving modular arithmetic, our short proof relies on the Fourier-type expansion for the floor function and on a trigonometric formula.
The nucleon axial mass and the MiniBooNE Quasielastic Neutrino-Nucleus Scattering problemJun 27 2011Dec 02 2011The charged-current double differential neutrino cross section, measured by the MiniBooNE Collaboration, has been analyzed using a microscopical model that accounts for, among other nuclear effects, long range nuclear (RPA) correlations and multinucleon ... More
Identification of blue high proper motion objects in the Tycho-2 and 2MASS catalogues using Virtual Observatory toolsSep 17 2010May 23 2011With available Virtual Observatory tools, we looked for new bright blue high proper motion objects in the entire sky: white dwarfs, hot subdwarfs, runaway OB stars, and early-type stars in nearby young moving groups. We performed an all-sky cross-match ... More
On the Lamperti stable processesFeb 06 2008Mar 06 2008We consider a new family of $\R^d$-valued L\'{e}vy processes that we call Lamperti stable. One of the advantages of this class is that the law of many related functionals can be computed explicitely (see for instance \cite{cc}, \cite{ckp}, \cite{kp} and ... More
Analysis of Meson Exchange and Isobar Currents in (e,e'p) Reactions from O-16Apr 12 1999Apr 13 1999An analysis of the effects of meson exchange and isobar currents in exclusive (e,e'p) processes from O-16 under quasi-free kinematics is presented. A model that has probed its feasibility for inclusive quasi-elastic (e,e') processes is considered. Sensitivity ... More
The simultaneous discharge of liquid and grains from a siloJan 17 2018The flow rate of water through an orifice at the bottom of a container depends on the hydrostatic pressure whereas for a dry granular material is nearly constant. But what happens during the simultaneous discharge of grains and liquid from a silo? By ... More
Shear Viscosity of the outer crust of Neutron stars: Ion ContributionJul 28 2008Oct 30 2008The shear viscosity of the crust might have a damping effect on the amplitude of r-modes of rotating neutron stars. This damping has implications for the emission of gravitational waves. We calculate the contribution to the shear viscosity coming from ... More
Explicit identities for Lévy processes associated to symmetric stable processesNov 03 2009In this paper we introduce a new class of L\'evy processes which we call hypergeometric-stable L\'evy processes, because they are obtained from symmetric stable processes through several transformations and where the Gauss hypergeometric function plays ... More
Impact of single-particle compressibility on the fluid-solid phase transition for ionic microgel suspensionsOct 17 2014We study ionic microgel suspensions composed of swollen particles for various single-particle stiffnesses. We measure the osmotic pressure $\pi$ of these suspensions and show that it is dominated by the contribution of free ions in solution. As this ionic ... More
Charged kaon production by coherent scattering of neutrinos and antineutrinos on nucleiMay 22 2012With the aim of achieving a better and more complete understanding of neutrino interactions with nuclear targets, the coherent production of charged kaons induced by neutrinos and antineutrinos is investigated in the energy range of some of the current ... More
Neutrino induced threshold production of two pions and N^*(1440) electroweak form factorsOct 18 2007Mar 24 2008We study the threshold production of two pions induced by neutrinos in nucleon targets. The contribution of nucleon, pion and contact terms are calculated using a chiral Lagrangian. The contribution of the Roper resonance, neglected in earlier studies, ... More
Gate induced enhancement of spin-orbit coupling in dilute fluorinated grapheneMar 04 2015We analyze the origin of spin-orbit coupling (SOC) in fluorinated graphene using Density Functional Theory (DFT) and a tight-binding model for the relevant orbitals. As it turns out, the dominant source of SOC is the atomic spin-orbit of fluorine adatoms ... More
Production of Two Pions Induced by NeutrinosFeb 09 2008Feb 12 2008We study the threshold production of two pions induced by neutrinos in nucleon targets. The contribution of nucleon pole, pion and contact terms is calculated using a chiral Lagrangian. The contribution of the Roper resonance, neglected in earlier studies, ... More
Neutrino-nucleus CCQE-like scatteringNov 28 2014RPA correlations, spectral function and 2p2h (multi-nucleon) effects on charged-current neutrino-nucleus reactions without emitted pions are discussed. We pay attention to the influence of RPA and multi-nucleon mechanisms on the MiniBooNE and MINERvA ... More
A High Angular Resolution Survey of Massive Stars in Cygnus OB2: Results from the Hubble Space Telescope Fine Guidance SensorsNov 20 2013We present results of a high angular resolution survey of massive OB stars in the Cygnus OB2 association that we conducted with the Fine Guidance Sensor 1R (FGS1r) on the Hubble Space Telescope. FGS1r is able to resolve binary systems with a magnitude ... More
CCQE, 2p2h excitations and ν-energy reconstructionApr 03 2013We analyze the MiniBooNE muon neutrino CCQE-like d\sigma/dT_\mu/dcos\theta_\mu data using a theoretical model that, among other nuclear effects, includes RPA correlations and 2p2h (multinucleon) mechanisms. These corrections turn out to be essential for ... More
X-ray Reverberation Observational Modelling in Active Galactic NucleiJan 14 2019Feb 15 2019X-ray reverberation in Active Galactic Nuclei, believed to be the result of the reprocessing of coronal photons by the underlying accretion disc, has allowed us to probe the properties of the inner-most regions of the accretion flow and the central black ... More
Maximum mass of a barotropic spherical starMar 05 2015Oct 01 2015The ratio of total mass $M$ to surface radius $R$ of spherical perfect fluid ball has an upper bound, $M/R < B$. Buchdahl obtained $B = 4/9$ under the assumptions; non-increasing mass density in outward direction, and barotropic equation of states. Barraco ... More
X-ray Reverberation Observational Modelling in Active Galactic NucleiJan 14 2019X-ray reverberation in Active Galactic Nuclei, believed to be the result of the reprocessing of coronal photons by the underlying accretion disc, has allowed us to probe the properties of the inner-most regions of the accretion flow and the central black ... More
Neutrino-induced one-pion production revisited: the $ν_μn\toμ^- nπ^+$ channelDec 07 2016We reanalyze our previous studies of neutrino-induced one-pion production on nucleons for outgoing $\pi N$ invariant masses below 1.4 GeV. Our motivation is to get a better description of the $\nu_\mu n\to\mu^- n\pi^+$ cross section, for which current ... More
Scaling Function and Nucleon Momentum DistributionApr 23 2010Scaling studies of inclusive quasielastic electron scattering reactions have been used in the past as a basic tool to obtain information on the nucleon momentum distribution in nuclei. However, the connection between the scaling function, extracted from ... More
Heavy Hadrons in Dense MatterSep 01 2015We study the behavior of dynamically-generated baryon resonances with heavy-quark content within a unitarized coupled-channel theory in matter that fulfills heavy-quark spin symmetry constraints. We analyze the implications for the formation of charmed ... More
Diffusive and arrested-like dynamics in currency exchange marketsMar 09 2017This work studies the symmetry between colloidal dynamics and the dynamics of the Euro--US Dollar currency exchange market (EURUSD). We consider the EURUSD price in the time range between 2001 and 2015, where we find significant qualitative symmetry between ... More
Search for bright nearby M dwarfs with Virtual Observatory toolsAug 07 2014Using Virtual Observatory tools, we cross-matched the Carlsberg Meridian 14 and the 2MASS Point Source catalogs to select candidate nearby bright M dwarfs distributed over ~ 25,000 deg^2. Here, we present reconnaissance low-resolution optical spectra ... More
Topical Issue in Solar Physics: Flux-rope Structure of Coronal Mass Ejections PrefaceMar 30 2013This Topical Issue of Solar Physics, devoted to the study of flux-rope structure in coronal mass ejections (CMEs), is based on two Coordinated Data Analysis Workshops (CDAWs) held in 2010 (20 - 23 September in Dan Diego, California, USA) and 2011 (September ... More
Macroscopic quantum self-trapping in a Bose-Josephson junction with fermionsMar 28 2008We study the macroscopic quantum self-trapping effect in a mixture of Bose-Einstein condensate and a large number of quantum degenerate fermions, trapped in a double-well potential with a variable separation between the wells. The large number of fermions ... More
The role of the $N^*(2080)$ resonance in the $\vecγ p \to K^+ Λ(1520)$ reactionJul 19 2010Oct 20 2010We investigate the $\Lambda(1520)$ photo-production in the $\vec{\gamma} p \to K^+ \Lambda(1520)$ reaction within the effective Lagrangian method near threshold. In addition to the "background" contributions from the contact, $t-$channel $K$ exchange, ... More
Superscaling and Neutral Current Quasielastic Neutrino-Nucleus Scattering beyond the Relativistic Fermi Gas ModelJun 01 2007The superscaling analysis is extended to include quasielastic (QE) scattering via the weak neutral current of neutrinos and antineutrinos from nuclei. The scaling function obtained within the coherent density fluctuation model (used previously in calculations ... More
Off-shell effects in the relativistic mean field model and their role in CC (anti)neutrino scattering at MiniBooNE kinematicsOct 02 2013The relativistic mean field (RMF) model is used to describe nucleons in the nucleus and thereby to evaluate the effects of having dynamically off-shell spinors. Compared with free, on-shell nucleons as employed in some other models, within the RMF nucleons ... More
Relativistic description of final-state interactions in neutral-current neutrino and antineutrino cross sectionsJul 16 2013We evaluate semi-inclusive neutral-current quasielastic differential neutrino and antineutrino cross sections within the framework of the relativistic impulse approximation. The results of the relativistic mean field and of the relativistic Green's function ... More
Neutrino damping in a fermion and scalar backgroundDec 13 2018We consider the propagation of a neutrino in a background composed of a scalar particle and a fermion using a simple model for the coupling of the form $\lambda\bar f_R\nu_L\phi$. In the presence of these interactions there can be damping terms in the ... More
Superscaling in electron-nucleus scattering and its link to CC and NC QE neutrino-nucleus scatteringMar 26 2013The superscaling approach (SuSA) to neutrino-nucleus scattering, based on the assumed universality of the scaling function for electromagnetic and weak interactions, is reviewed. The predictions of the SuSA model for bot CC and NC differential and total ... More
The INTEGRAL-OMC Scientific ArchiveOct 21 2008The Optical Monitoring Camera (OMC) on-board the INTEGRAL satellite has, as one of its scientific goals, the observation of a large number of variable sources previously selected. After almost 6 years of operations, OMC has monitored more than 100 000 ... More
Resonance interpretation of the bump structure in the $γp \to K^+ Λ(1520)$ differential cross sectionJul 27 2011Aug 11 2011We investigate the $\Lambda(1520)$ photoproduction in the $\vec{\gamma} p \to K^+ \Lambda(1520)$ reaction within the effective Lagrangian method near threshold. In addition to the "background" contributions from the contact, $t-$channel $K$ exchange, ... More
Parity violation in quasielastic electron scattering from closed-shell nucleiOct 03 1995The electromagnetic and weak neutral current matrix elements that enter in the analysis of parity-violating quasielastic electron scattering are calculated using a continuum nuclear shell model. New approximations to the on-shell relativistic one-body ... More
Divisors on overlapped intervals and multiplicative functionsSep 27 2017Consider the real numbers $$ \ell_{n,k} = \ln\left( \tfrac{3}{2}\,k+\sqrt{\left(\tfrac{3}{2}\,k \right)^2 + 3\,n} \right) $$ and the intervals $\mathcal{L}_{n,k} = \left]\ell_{n,k}-\ln 3,\ell_{n,k}\right]$. For all $n \geq 1$, define $$ \frac{L_n(q)}{q^{n-1}} ... More
On a function introduced by Erdös and NicolasSep 27 2017Erd\"os and Nicolas [erdos1976methodes] introduced an arithmetical function $F(n)$ related to divisors of $n$ in short intervals $\left] \frac{t}{2}, t\right]$. The aim of this note is to prove that $F(n)$ is the largest coefficient of polynomial $P_n(q)$ ... More
The brightest stars of the sigma Orionis clusterJan 03 2007Context: The very young sigma Orionis cluster (about 3 Ma) is a cornerstone for the understanding of the formation of stars and substellar objects down to planetary masses. However, its stellar population is far to be completely known. Aims: This study ... More
Identifying the nature of high energy AstroparticlesAug 10 2016Feb 12 2017High energy Astroparticles include Cosmic Ray, gamma ray and neutrinos, all of them coming from the universe. The origin and production, acceleration and propagation mechanisms of ultrahigh-energy CR (up to $10^{20}$ eV) are still unknown. Knowledge on ... More
On the minimum of a conditioned Brownian bridgeNov 18 2015Nov 13 2017We study the law of the minimum of a Brownian bridge, conditioned to take specific values at specific points, and the law of the location of the minimum. They are used to compare some non-adaptive optimisation algorithms for black-box functions for which ... More
The Gaia Ultra-Cool Dwarf Sample -- II: Structure at the end of the main sequenceFeb 20 2019We identify and investigate known late M, L and T dwarfs in the Gaia second data release. This sample is being used as a training set in the Gaia data processing chain of the ultra cool dwarfs work package. We find 695 objects in the optical spectral ... More
Middle divisors and $σ$-palindromic Dyck wordsSep 13 2017Sep 23 2017Given a real number $\lambda > 1$, we say that $d|n$ is a $\lambda$-middle divisor of $n$ if $$ \sqrt{\frac{n}{\lambda}} < d \leq \sqrt{\lambda n}. $$ We will prove that there are integers having an arbitrarily large number of $\lambda$-middle divisors. ... More
Factorization of Dyck words and the distribution of the divisors of an integerSep 13 2017In [CaballeroHooleyDelta], we associated a Dyck word $\langle\! \langle n \rangle\! \rangle_{\lambda}$ to any pair $(n, \lambda)$ consisting of an integer $n \geq 1$ and a real number $\lambda > 1$. The goal of the present paper is to show a relationship ... More
On prime numbers of the form $2^n \pm k$Sep 13 2017Consider the set $\mathcal{K}$ of integers $k$ for which there are infinitely many primes $p$ such that $p+k$ is a power of $2$. The aim of this paper is to show a relationship between $\mathcal{K}$ and the limits points of some set rational numbers related ... More
Relativistic model of 2p-2h meson exchange currents in (anti)neutrino scatteringApr 28 2016We develop a model of relativistic, charged meson-exchange currents (MEC) for neutrino-nucleus interactions. The two-body current is the sum of seagull, pion-in-flight, pion-pole and $\Delta$-pole operators. These operators are obtained from the weak ... More
Angular distribution in two-particle emission induced by neutrinos and electronsJul 26 2014Oct 15 2014The angular distribution of the phase space arising in two-particle emission reactions induced by electrons and neutrinos is computed in the laboratory (Lab) system by boosting the isotropic distribution in the center of mass (CM) system used in Monte ... More
Comparing the Matter and Interactions Curriculum with a Traditional Physics Curriculum: A Think Aloud StudyNov 24 2010Physics curricula across the US fail to prepare students adequately to solve problems, especially novel problems. A new curriculum, Matter and Interactions (M&I), was designed to improve student learning by organizing concepts around fundamental principles. ... More
Mean field and two-body nuclear effects in inclusive electron scattering on argon, carbon and titanium: the superscaling approachFeb 17 2019We compare the predictions of the SuSAv2 model including two-particle two-hole meson-exchange currents with the recent JLab data for inclusive electron scattering on three different targets (C, Ar and Ti). The agreement is very good over the full energy ... More
Superscaling analysis of inclusive electron scattering and its extension to charge-changing neutrino-nucleus cross sections beyond the relativistic Fermi gas approachSep 19 2006Superscaling analyses of inclusive electron scattering from nuclei are extended from the quasielastic processes to the delta excitation region. The calculations of $(e,e^\prime)$ cross sections for the target nucleus $^{12}$C at various incident electron ... More
The LHCb pentaquark as a $\bar{D}^*Σ_c-\bar{D}^*Σ_c^*$ molecular stateJul 15 2015Oct 21 2015We perform a theoretical analysis of the $\Lambda_b \to J/\psi K^- p$ reaction from where a recent LHCb experiment extracts a $\Lambda(1405)$ contribution in the $K^- p$ spectrum close to threshold and two baryon states of hidden charm in the $J/\psi\,p$ ... More
Regge signatures from forward CLAS $Λ(1520)$ photoproduction dataMay 13 2014The $\gamma p \to K^+ \Lambda(1520)$ reaction mechanism is investigated within a Regge--effective Lagrangian hybrid approach based on our previous study of this reaction [Physical Review C89, 015203 (2014)]. Near threshold and for large $K^+$ angles, ... More
Inelastic neutrino and antineutrino scattering on nuclei and ``strangeness'' of the nucleonMar 25 1997Possibilities to extract information on the strange form factors of the nucleon from neutrino (antineutrino) inelastic scattering on nuclei, in an energy range from 200 MeV to 1 GeV and more, are investigated in detail. All calculations are performed ... More
$Ω_c$ excited states: a molecular approach with heavy-quark spin symmetryDec 14 2018The LHCb Collaboration has recently discovered five excited $\Omega_c$ states with masses between 3 and 3.1 GeV, four of them corroborated by the Belle Collaboration. We analyse the dynamical generation of these states within a molecular baryon-meson ... More
Scaling Function, Spectral Function and Nucleon Momentum Distribution in NucleiApr 01 2011The link between the scaling function extracted from the analysis of (e,e') cross sections and the spectral function/momentum distribution in nuclei is revisited. Several descriptions of the spectral function based on the independent particle model are ... More
Neutron Transfer Studied with a Radioactive beam of 24Ne, using TIARA at SPIRALDec 20 2009A general experimental technique for high resolution studies of nucleon transfer reactions using radioactive beams is briefly described, together with the first new physics results that have been obtained with the new TIARA array. These first results ... More
A realistic spectral function model for charged-current quasielastic-like neutrino and antineutrino cross sections on $^{12}$CDec 22 2018A detailed study of charged current quasielastic neutrino and antineutrino scattering cross sections on a $^{12}$C target with no pions in the final state is presented. The initial nucleus is described by means of a realistic spectral function $S(p,{\cal ... More
Strange form factors of the proton: a new analysis of the neutrino (antineutrino) data of the BNL-734 experimentDec 16 1998We consider ratios of elastic neutrino(antineutrino)-proton cross sections measured by the Brookhaven BNL-734 experiment and use them to obtain the neutral current (NC) over charged current (CC) neutrino-antineutrino asymmetry. We discuss the sensitivity ... More
Planck Spectroscopy and the Quantum Noise of Microwave Beam SplittersMar 16 2010We use a correlation function analysis of the field quadratures to characterize both the black body radiation emitted by a 50 Ohm load resistor and the quantum properties of two types of beam splitters in the microwave regime. To this end, we first study ... More
Music and AstronomyOct 11 2008Oct 16 2008What do Brian May (the Queen's lead guitarist), William Herschel and the Jupiter Symphony have in common? And a white dwarf, a piano and Lagartija Nick? At first glance, there is no connection between them, nor between Music and Astronomy. However, there ... More
Dual-path state reconstruction scheme for propagating quantum microwaves and detector noise tomographyJan 20 2010Mar 11 2010Quantum state reconstruction involves measurement devices that are usually described by idealized models, but not known in full detail in experiments. For weak propagating microwaves, the detection process requires linear amplifiers which obscure the ... More
Geometric properties of surfaces with the same mean curvature in R^3 and L^3Apr 14 2016Spacelike surfaces in the Lorentz-Minkowski space L^3 can be endowed with two different Riemannian metrics, the metric inherited from L^3 and the one induced by the Euclidean metric of R^3. It is well known that the only surfaces with zero mean curvature ... More
On the asymptotic behaviour of increasing positive self-similar Markov processesNov 12 2007We are interested by the rate of growth of increasing positive self-similar Markov processes (ipssMp) such that the subordinator associated to it via Lamperti's transformation has infinite mean. We prove that the logarithm of an ipssMp normalized by the ... More
Activity from the Be/X-ray binary system V0332+53 during its intermediate-luminosity outburst in 2008Jun 29 2015Jan 13 2016Aims: We present a study of the Be/X-ray binary system V 0332+53 with the main goal of characterizing its behavior mainly during the intermediate-luminosity X-ray event on 2008. In addition, we aim to contribute to the understanding of the global behavior ... More
Implementing Argumentation-enabled Empathic AgentsDec 12 2018In a previous publication, we introduced the core concepts of empathic agents as agents that use a combination of utility-based and rule-based approaches to resolve conflicts when interacting with other agents in their environment. In this work, we implement ... More
$Ω_c$ excited states with heavy-quark spin symmetryNov 13 2018We study the $C=1$, $S=-2$, $I=0$ sector, where five excited $\Omega_c$ states have been recently observed by the LHCb Collaboration. We start from a recently developed unitarized baryon-meson model that takes, as bare baryon-meson interaction, an extended ... More
Re-analysis of the $Λ(1520)$ photoproduction reactionSep 27 2013Feb 19 2014Based on previous studies that support the important role of the $N^*(2120) D_{13}$ resonance in the $\gamma p \to K^+ \Lambda(1520)$ reaction, we make a re-analysis of this $\Lambda(1520)$ photoproduction reaction taking into account the recent CLAS ... More
Empathic Autonomous AgentsFeb 20 2019Identifying and resolving conflicts of interests is a key challenge when designing autonomous agents. For example, such conflicts often occur when complex information systems interact persuasively with humans and are in the future likely to arise in non-human ... More
Albus 1: A very bright white dwarf candidateJul 09 2007We have serendipitously discovered a previously-unknown, bright source (B_T = 11.75+/-0.07 mag) with a very blue V_T-K_s color, to which we have named Albus 1. A photometric and astrometric study using Virtual Observatory tools has shown that it possesses ... More
Young stars and brown dwarfs surrounding Alnilam (eps Ori) and Mintaka (del Ori)Apr 14 2008Aims: We look for new regions for the search of substellar objects. Methods: Two circular areas, 45 arcmin-radius each, centred on the young massive star systems Alnilam and Mintaka in the Orion Belt, have been explored. The regions are very young (less ... More
Recent activity of the Be/X-ray binary system SAX J2103.5+4545May 16 2014Aims. We present a multiwavelength study of the Be/X-ray binary system SAX J2103.5+4545 with the goal of better characterizing the transient behaviour of this source. Methods. SAX J2103.5+4545 was observed by Swift-XRT four times in 2007 from April 25 ... More
Emission of neutron-proton and proton-proton pairs in electron scattering induced by meson-exchange currentsJun 21 2016We use a relativistic model of meson-exchange currents to compute the proton-neutron and proton-proton yields in $(e,e')$ scattering from $^{12}$C in the 2p-2h channel. We compute the response functions and cross section with the relativistic Fermi gas ... More
Emission of neutron-proton and proton-proton pairs in neutrino scatteringJul 28 2016We use a recently developed model of relativistic meson-exchange currents to compute the neutron-proton and proton-proton yields in $(\nu_\mu,\mu^-)$ scattering from $^{12}$C in the 2p-2h channel. We compute the response functions and cross sections with ... More
Cygnus X-3 transition from the ultrasoft to the hard stateAug 03 2007Aug 06 2007Aims: The nature of Cygnus X-3 is still not understood well. This binary system might host a black hole or a neutron star. Recent observations by INTEGRAL have shown that Cygnus X-3 was again in an extremely ultrasoft state. Here we present our analysis ... More
The MalSource Dataset: Quantifying Complexity and Code Reuse in Malware DevelopmentNov 16 2018During the last decades, the problem of malicious and unwanted software (malware) has surged in numbers and sophistication. Malware plays a key role in most of today's cyber attacks and has consolidated as a commodity in the underground economy. In this ... More
Bivalent defect configurations in inhomogeneous nematic shellsNov 19 2012We present a theoretical study of the director fields and energetics of nematic liquid crystal shells with two pairs of surface defects. The pairs of defects can undergo abrupt transitions between a configuration of maximum separation to at state in which ... More
Meson-Baryon s-wave Resonances with Strangeness -3Oct 26 2006Starting from a consistent SU(6) extension of the Weinberg-Tomozawa (WT) meson-baryon chiral Lagrangian (Phys. Rev. D74 (2006) 034025), we study the s-wave meson-baryon resonances in the strangeness S=-3 and negative parity sector. Those resonances are ... More
The role of $N^*(2120)$ nucleon resonance in $KΛ(1520)$ photon and hadronic productionsNov 03 2013The associate $K\Lambda(1520)$ photon and hadronic production in the $\gamma p \to K^+\Lambda(1520)$, $p p \to p K^+ \Lambda(1520)$ and $\pi^- p \to K^0 \Lambda(1520)$ reactions are investigated within the effective Lagrangian approach and the isobar ... More
Scaling limits of general population processes - Wright-Fisher and branching processes in random environmentFeb 07 2018Our motivation comes from the large population approximation of individual based models in population dynamics and population genetics. We propose a general method to investigate scaling limits of finite dimensional population size Markov chains to diffusion ... More
Study of Risetime as a function of the distance to the Shower Core in the Surface Detector (SD) of the Pierre Auger ObservatoryMar 21 2017Cosmic Rays (CR) are high energy particles which come from the universe. When one of those particles enters to the atmosphere of the earth it produces an air shower, conformed by secondary particles in which the initial energy is distributed. The Pierre ... More
Weak production of strange and charm ground-state baryons in nucleiJan 29 2019We present results for the quasi-elastic weak production of $\Lambda$ and $\Sigma$ hyperons induced by $\bar{\nu}$ scattering off nuclei, in the kinematical region of interest for accelerator neutrino experiments. We employ realistic hole spectral functions ... More
Quantum optical lattices for emergent many-body phases of ultracold atomsApr 24 2015Nov 10 2015Confining ultracold gases in cavities creates a paradigm of quantum trapping potentials. We show that this allows to bridge models with global collective and short-range interactions as novel quantum phases possess properties of both. Some phases appear ... More
Rotational Surfaces in $\mathbb{L}^3$ and Solutions in the Nonlinear Sigma ModelMay 15 2007Nov 13 2008The Gauss map of non-degenerate surfaces in the three-dimensional Minkowski space are viewed as dynamical fields of the two-dimensional O(2,1) Nonlinear Sigma Model. In this setting, the moduli space of solutions with rotational symmetry is completely ... More
Remarks on the $P_c$ structures and triangle singularitiesMay 17 2016Sep 19 2016It was proposed that the narrow $P_c(4450)$ structure observed by the LHCb Collaboration in the reaction $\Lambda_b\to J/\psi p K$ might be due to a triangle singularity around the $\chi_{c1}$--proton threshold at 4.45~GeV. We discuss the occurrence of ... More
Testing nuclear models via neutrino scatteringNov 21 2014Recent progresses on the relativistic modeling of neutrino-nucleus reactions are presented and the results are compared with high precision experimental data in a wide energy range.
Meson-exchange currents and quasielastic predictions for charged-current neutrino-12C scattering in the superscaling approachDec 04 2014Apr 14 2015We evaluate and discuss the impact of meson-exchange currents (MECs) on charged-current quasielastic neutrino cross sections. We consider the nuclear transverse response arising from two-particle two-hole states excited by the action of electromagnetic, ... More
Ranked Document Retrieval in (Almost) No SpaceJul 23 2012Ranked document retrieval is a fundamental task in search engines. Such queries are solved with inverted indexes that require additional 45%-80% of the compressed text space, and take tens to hundreds of microseconds per query. In this paper we show how ... More
Pathways to quiescence: SHARDS view on the Star Formation Histories of massive quiescent galaxies at 1.0 < z < 1.5Jul 28 2015Jan 21 2016We present Star Formation Histories (SFHs) for a sample of 104 massive (stellar mass M > 10$^{10}$ M$_{\odot}$) quiescent galaxies (MQGs) at $z$=1.0-1.5 from the analysis of spectro-photometric data from the SHARDS and HST/WFC3 G102 and G141 surveys of ... More
Interacting LAEs at z = 5.1. Episodic star formation in a group of LAEs at z= 5.07Jun 28 2014We are undertaking a search for high-redshift low luminosity Lyman Alpha sources in the SHARDS survey. Among the pre-selected Lyman Alpha sources 2 candidates were spotted, located 3.19 arcsec apart, and tentatively at the same redshift. Here we report ... More
X-ray absorption, nuclear infrared emission and dust covering factors of AGN: testing Unification SchemesJan 18 2016Jan 22 2016We present the distributions of geometrical covering factors of active galactic nuclei (AGNs) dusty tori (f2) using an X-ray selected complete sample of 227 AGN drawn from the Bright Ultra-hard XMM-Newton Survey. The AGN have z from 0.05 to 1.7, 2-10 ... More
CARMENES input catalogue of M dwarfs II. High-resolution imaging with FastCamAug 29 2016Aims: We search for low-mass companions of M dwarfs and characterize their multiplicity fraction with the purpose of helping in the selection of the most appropriate targets for the CARMENES exoplanet survey. Methods: We obtained high-resolution images ... More
Optically faint massive Balmer Break Galaxies at z>3 in the CANDELS/GOODS fieldsJun 11 2018We present a sample of 33 Balmer Break Galaxies (BBGs) selected as dropouts in the deepest HST/F160W images of the two CANDELS/GOODS fields (i.e., $H\gtrsim27.3$ mag) but relatively bright in Spitzer/IRAC ($[3.6],[4.5]<24.5$ mag). Half of these BBGs are ... More
A probabilistic atlas of the human thalamic nuclei combining ex vivo MRI and histologyJun 22 2018The human thalamus is a brain structure that comprises numerous, highly specific nuclei. Since these nuclei are known to have different functions and to be connected to different areas of the cerebral cortex, it is of great interest for the neuroimaging ... More