Results for "M. Lozada-Hidalgo"

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Transport of hydrogen isotopes through interlayer spacing in van der Waals crystalsFeb 09 2018Atoms start behaving as waves rather than classical particles if confined in spaces commensurate with their de Broglie wavelength. At room temperature this length is only about one angstrom even for the lightest atom, hydrogen. This restricts quantum-confinement ... More
Perfect proton selectivity in ion transport through two-dimensional crystalsAug 21 2019Aug 31 2019Defect-free monolayers of graphene and hexagonal boron nitride were previously shown to be surprisingly permeable to thermal protons, despite being completely impenetrable to all gases. It remains untested whether small ions can permeate through the two-dimensional ... More
Sieving hydrogen isotopes through two dimensional crystalsNov 20 2015Jan 02 2016One-atom-thick crystals are impermeable to atoms and molecules, but hydrogen ions (thermal protons) penetrate through them. We show that monolayers of graphene and boron nitride can be used to separate hydrogen ion isotopes. Employing electrical measurements ... More
The Hitchhiker model for Laplace diffusion processes in the cell environmentSep 16 2019Aggregation and fragmentation of single molecules in the cell environment lead to a spectrum of diffusivities and to statistical laws of movement very different from typical Brownian motion. Current models of intracellular transport do not explain at ... More
Scalable and efficient separation of hydrogen isotopes using graphene-based electrochemical pumpingFeb 24 2017May 17 2017Thousands of tons of isotopic mixtures are processed annually for heavy-water production and tritium decontamination. The existing technologies remain extremely energy intensive and require large capital investments. New approaches are needed to reduce ... More
Dressed coordinates: the path-integrals approachJun 30 2005Feb 03 2007The recent introduced \textit{dressed coordinates} are studied in the path-integral approach. These coordinates are defined in the context of a harmonic oscillator linearly coupled to massless scalar field and, it is shown that in this model the dressed ... More
Large Deviations for Random Power Moment ProblemOct 06 2004We consider the set M_n of all n-truncated power moment sequences of probability measures on [0,1]. We endow this set with the uniform probability. Picking randomly a point in M_n, we show that the upper canonical measure associated with this point satisfies ... More
Simultaneous Assembly of van der Waals Heterostructures into Multiple NanodevicesMay 11 2018Van der Waals heterostructures (vdWH) are made of different two-dimensional (2D) layers stacked on top of each other, forming a single material with unique properties that differ from those of the individual 2D constituent layers, and that can be modulated ... More
Towards a Precision Cosmology from Starburst Galaxies at z>2Oct 25 2004This work investigates the use of a well-known empirical correlation between the velocity dispersion, metallicity, and luminosity in H beta of nearby HII galaxies to measure the distances to HII-like starburst galaxies at high redshifts. This correlation ... More
Generalized Dirichlet distributions on the ball and momentsFeb 08 2010Oct 21 2010The geometry of unit $N$-dimensional $\ell_{p}$ balls has been intensively investigated in the past decades. A particular topic of interest has been the study of the asymptotics of their projections. Apart from their intrinsic interest, such questions ... More
Atomically-thin micas as proton conducting membranesJun 11 2019Monolayers of graphene and hexagonal boron nitride (hBN) are highly permeable to thermal protons. For thicker two-dimensional (2D) materials, proton conductivity diminishes exponentially so that, for example, monolayer MoS2 that is just three atoms thick ... More
One-Dimensional Photon Transport Through a Two-Terminal Scattering Cluster: Tight-Binding FormalismMar 27 2017Employing tight-binding approximation we derive a transfer matrix formalism for one-dimensional single photon transport through a composite scattering center, which consists of parallel connected resonator optical waveguides. By solving the single-mode ... More
Perfect proton selectivity in ion transport through two-dimensional crystalsAug 21 2019Defect-free monolayers of graphene and hexagonal boron nitride were previously shown to be surprisingly permeable to thermal protons, despite being completely impenetrable to all gases. It remains untested whether small ions can permeate through the two-dimensional ... More
Complete steric exclusion of ions and proton transport through confined monolayer waterNov 22 2018Dec 21 2018It has long been an aspirational goal to create artificial structures that allow fast permeation of water but reject even the smallest hydrated ions, replicating the feat achieved by nature in protein channels (e.g., aquaporins). Despite recent progress ... More
Population inversion of a NAHS mixture adsorbed into a cylindrical poreSep 13 2007Nov 19 2008A cylindrical nanopore immersed in a non-additive hard sphere binary fluid is studied by means of integral equation theories and Monte Carlo simulations. It is found that at low and intermediate values of the bulk total number density the more concentrated ... More
Fields of definition of cyclic p-gonal curvesSep 26 2013Let $S$ be cyclic $p$-gonal Riemann surface, that is, a closed Riemann surface of genus $g \geq 2$ admitting a conformal automorphism $\varphi$ of prime order $p$ so that $S/\langle \varphi \rangle$ has genus zero. In this article we provide a short argument ... More
Bipartite graphs and their dessins d'enfantsNov 09 2016Aug 22 2017Each finite and connected bipartite graph induces a finite collection of non-isomorphic dessins d'enfants, that is, $2$-cell embeddings of it into some closed orientable surface. We describe an algorithm to compute all these dessins d'enfants, together ... More
Vortices on demand in multicomponent Bose-Einstein condensatesJul 05 2012Nov 22 2012We present a simple mechanism to produce vortices at any desired spatial locations in harmonically trapped Bose-Einstein condensates (BEC) with multicomponent spin states coupled to external transverse and axial magnetic fields. The vortices appear at ... More
Proton transport through one atom thick crystalsOct 31 2014Graphene is impermeable to all gases and liquids, and even such a small atom as hydrogen is not expected to penetrate through graphene's dense electronic cloud within billions of years. Here we show that monolayers of graphene and hexagonal boron nitride ... More
Molecular transport through capillaries made with atomic-scale precisionJun 29 2016Sep 08 2016Nanometre-scale pores and capillaries have long been studied because of their importance in many natural phenomena and their use in numerous applications. A more recent development is the ability to fabricate artificial capillaries with nanometre dimensions, ... More
Timing performance of small cell 3D silicon detectorsJan 08 2019Jan 15 2019A silicon 3D detector with a single cell of 50x50 um2 was produced and evaluated for timing applications. The measurements of time resolution were performed for 90Sr electrons with dedicated electronics used also for determining time resolution of Low ... More
Quantum nanoconstrictions fabricated by cryo-etching in encapsulated grapheneFeb 20 2019More than a decade after the discovery of graphene, ballistic transport in nanostructures based on this intriguing material still represents a challenging field of research in two-dimensional electronics. The presence of rough edges in nanostructures ... More
Two rods confined by positive plates: Effective forces and charge distribution profilesOct 15 2010Monte Carlo simulations were employed to study two negative rods confined between two parallel plates. The system is immersed in a 1-1 restricted primitive model electrolyte. Ion distributions and forces per unit of area (pressures) on rods and plates ... More
Coherent control of phase diffusion in a Bosonic Josephson junction by scattering length modulationApr 15 2013By means of a temporal-periodic modulation of the s-wave scattering length, a procedure to control the evolution of an initial atomic coherent state associated with a Bosonic Josephson junction is presented. The scheme developed has a remarkable advantage ... More
Giant photo-effect in proton transport through graphene membranesJan 15 2018Graphene has recently been shown to be permeable to thermal protons, the nuclei of hydrogen atoms, which sparked interest in its use as a proton-conducting membrane in relevant technologies. However, the influence of light on proton permeation remains ... More
The role of host star variability in the detectability of planetary phase curvesOct 17 2018Phase curves, or the change in observed illumination of the planet as it orbits around its host star, help us to characterize their atmospheres. However, the variability of the host star can make their detection challenging: the presence of starspots, ... More
Mechanisms of Dispersion in a Porous MediumSep 22 2017Mar 02 2018This paper studies the mechanisms of dispersion in the laminar flow through the pore space of a $3$-dimensional porous medium. We focus on pre-asymptotic transport prior to the asymptotic hydrodynamic dispersion regime, in which solute motion may be described ... More
Finite-Time and -Size Scalings in the Evaluation of Large Deviation Functions - Part II: Numerical Approach in Continuous TimeJul 29 2016Rare trajectories of stochastic systems are important to understand -- because of their potential impact. However, their properties are by definition difficult to sample directly. Population dynamics provide a numerical tool allowing their study, by means ... More
Finite-Time and -Size Scalings in the Evaluation of Large Deviation Functions - Part I: Analytical Study using a Birth-Death ProcessJul 16 2016Oct 25 2016The Giardin\`a-Kurchan-Peliti algorithm is a numerical procedure that uses population dynamics in order to calculate large deviation functions associated to the distribution of time-averaged observables. To study the numerical errors of this algorithm, ... More
Finite-Time and -Size Scalings in the Evaluation of Large Deviation Functions - Part II: Numerical Approach in Continuous TimeJul 29 2016Oct 25 2016Rare trajectories of stochastic systems are important to understand -- because of their potential impact. However, their properties are by definition difficult to sample directly. Population dynamics provide a numerical tool allowing their study, by means ... More
A study of the fractional quantum Hall effect: Odd and even denominator plateauxOct 07 2013Nov 19 2013We present a different approach to the fractional quantum Hall effect (FQHE), focusing it as a consequence of the change in the symmetry of the Hamiltonian of every electron in a two-dimensional electron gas (2DEG) under the application of a magnetic ... More
Weierstrass weight of the hyperosculating points of generalized Fermat curvesSep 14 2018Let $(S,H)$ be a generalized Fermat pair of the type $(k,n)$. If $F\subset S$ is the set of fixed points of the non-trivial elements of the group $H$, then $F$ is exactly the set of hyperosculating points of the standard embedding $S\hookrightarrow {\mathbb{P}}^{n}$. ... More
On generalized superelliptic Riemann surfacesSep 30 2016A closed Riemann surface $\mathcal X$, of genus $g \geq 2$, is called a generalized superelliptic curve of level $n \geq 2$ if it admits an order $n$ conformal automorphism $\tau$ so that $\mathcal X/\langle \tau \rangle$ has genus zero and $\tau$ is ... More
A study of the magnetotransport properties of the graphene (I. Monolayer)Apr 22 2014We present a single electron approach to analyse the magnetotransport properties of the monolayer graphene as a function of both, the gate voltage and the magnetic field; and, also, their evolution with temperature. The model proposed means the extension ... More
The effect of confinement on the interaction between two like-charged rodsOct 15 2010Monte Carlo simulations were employed to study two charged rods confined between two unlike charged plates, all immersed in a model electrolyte. Recently, it was shown that two rods immersed in a multivalent counterion solution may show attraction (PRL ... More
The Gribov problem in presence of background field for $SU(2)$ Yang-Mills theoryOct 25 2016Mar 13 2017The Gribov problem in the presence of a background field is analyzed: in particular, we study the Gribov copies equation in the Landau-De Witt gauge as well as the semi-classical Gribov gap equation. As background field, we choose the simplest non-trivial ... More
A study of the magnetotransport properties of the graphene (II. Fractional Quantum Hall Effect)Jul 17 2015We present an approach to the fractional quantum Hall effect observed in grapheme (GFQHE), basing us on the model developed previously for the fractional quantum Hall effect in a two-dimensional electron system embedded in a quantum well (FQHE) [Hidalgo, ... More
Spin Magnetotransport in a Two-Dimensional Electron System under quantum Hall regime and with Rashba spin-orbit effectJan 12 2012The article shows a simple model that computes the magnetoconduction and the integer quantum Hall effect (IQHE) in a two-dimensional electron system (2DES) where the spin is other degree of freedom in the system. The 2DES is confined in a quantum well ... More
A model for the study of the Shubnikov-de Haas and the integer quantum Hall effects in a two dimensional electronic systemJul 30 2007Up to know all the experimental results concerning the integer and fractional quantum Hall effect are related to semiconductor heterostructures (and more recently with graphene). The common characteristic of all these systems is the presence of a reservoir ... More
A study of the magnetotransport properties of the graphene (III. Bilayer)Feb 08 2016The present paper corresponds to the third work of the author related to the magnetotransport properties concerning on the graphene systems. In the first one the integer quantum Hall effect in the monolayer graphene, (MG), MGIQHE, was analysed, (Hidalgo, ... More
Two-hidden-layer Feedforward Neural Networks are Universal Approximators: A Constructive ApproachJul 26 2019It is well known that Artificial Neural Networks are universal approximators. The classical result proves that, given a continuous function on a compact set on an n-dimensional space, then there exists a one-hidden-layer feedforward network which approximates ... More
The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters. I. Overview of the Project and Detection of Multiple Stellar PopulationsOct 16 2014In this paper we describe a new UV-initiative HST project (GO-13297) that will complement the existing F606W and F814W database of the ACS Globular Cluster (GC) Treasury by imaging most of its clusters through UV/blue WFC3/UVIS filters F275W, F336W and ... More
Point Sets with Small Integer Coordinates and with Small Convex PolygonsFeb 09 2016Jul 12 2017In 1935, Erd\H{o}s and Szekeres proved that every set of $n$ points in general position in the plane contains the vertices of a convex polygon of $\frac{1}{2}\log_2(n)$ vertices. In 1961, they constructed, for every positive integer $t$, a set of $n:=2^{t-2}$ ... More
Modelling non-dust fluids in cosmologyJul 08 2012Dec 04 2012Currently, most of the numerical simulations of structure formation use Newtonian gravity. When modelling pressureless dark matter, or `dust', this approach gives the correct results for scales much smaller than the cosmological horizon, but for scenarios ... More
Galaxy number counts at second order: an independent approachAug 22 2019Next generation surveys will be capable of determining cosmological parameters beyond percent level.To match this precision, theoretical descriptions should look beyond the linear perturbations to approximate the observables in large scale structure. ... More
Analytic topologically non-trivial solutions of the (3+1)-dimensional $U(1)$ gauged Skyrme model and extended dualityNov 20 2017We construct the first analytic examples of topologically non-trivial solutions of the (3+1)-dimensional $U(1)$ gauged Skyrme model within a finite box in (3+1)-dimensional flat space-time. There are two types of gauged solitons. The first type corresponds ... More
Non-Relativistic Maxwell Chern-Simons GravityFeb 23 2018Mar 15 2018We consider a non-relativistic (NR) limit of $(2+1)$-dimensional Maxwell Chern-Simons (CS) gravity with gauge algebra [Maxwell] $\oplus \ u(1)\oplus u(1)$. We obtain a finite NR CS gravity with a degenerate invariant bilinear form. We find two ways out ... More
Red Dots: A temperate 1.5 Earth-mass planet in a compact multi-terrestrial planet system around GJ1061Aug 13 2019Small low-mass stars are favourable targets for the detection of rocky habitable planets. In particular, planetary systems in the solar neighbourhood are interesting and suitable for precise characterisation. The Red Dots campaigns seek to discover rocky ... More
Entanglement of a two-atom system driven by the quantum vacuum in arbitrary cavity sizeNov 04 2015Nov 10 2015We study the dynamical entanglement of two identical atoms interacting with a quantum field. As a simplified model for this physical system we consider two harmonic oscillators linearly coupled to a massless scalar field in the dressed coordinates and ... More
On recent SFR calibrations and the constant SFR approximationFeb 11 2016Star Formation Rate (SFR) inferences are based in the so-called constant SFR approximation, where synthesis models are require to provide a calibration; we aims to study the key points of such approximation to produce accurate SFR inferences. We use the ... More
Non-Kramers Freezing and Unfreezing of Tunneling in the Biaxial Spin ModelFeb 16 1999Jul 11 2000The ground state tunnel splitting for the biaxial spin model in the magnetic field, H = -D S_{x}^2 + E S_{z}^2 - g \mu_B S_z H_z, has been investigated using an instanton approach. We find a new type of spin instanton and a new quantum interference phenomenon ... More
Entropy production for coarse-grained dynamicsOct 03 2018Systems out of equilibrium exhibit a net production of entropy. We study the dynamics of a stochastic system represented by a master equation that can be modeled by a Fokker-Planck equation in a coarse-grained, mesoscopic description. We show that the ... More
Diffuse Ionized Gas inside the dwarf irregular galaxy NGC 6822Mar 05 2007We have studied the differences between the diffuse ionized gas (DIG) and the HII regions along a slit position in the local dwarf irregular galaxy NGC 6822. The slit position passes through the two most prominent HII regions: Hubble V and Hubble X. Important ... More
Production of W-+ with an anomalous magnetic moment via the collision of an ultrahigh-energy (anti)neutrino on a target nucleonOct 21 2003Sep 09 2004We discuss the production of W-+ bosons in deep inelastic processes (anti-nu)nu + nucleon --> l+- + W-+ + X, in the context of an electroweak model in which the vector boson self interactions may be different from those prescribed by the electroweak standard ... More
Entropy production for coarse-grained dynamicsOct 03 2018Jul 03 2019Systems out of equilibrium exhibit a net production of entropy. We study the dynamics of a stochastic system represented by a Master Equation that can be modeled by a Fokker-Planck equation in a coarse-grained, mesoscopic description. We show that the ... More
Short-Period Variables in the Local Group Dwarf Galaxies Tucana and LGS3Jan 25 2007We present preliminary results concerning the search for short-period variable stars in Tucana and LGS3 based on very deep HST/ACS imaging. In the fraction of the observed field we studied in each galaxy, a total of 133 and 30 variables were found, respectively. ... More
Scarce defects induce anomalous deterministic diffusionMay 05 2016We introduce a simple model of deterministic particles in weakly disordered media which exhibits a transition from normal to anomalous diffusion. The model consists of a set of non-interacting overdamped particles moving on a disordered potential. The ... More
Quantum simulation of the Anderson Hamiltonian with an array of coupled nanoresonators: delocalization and thermalization effectsAug 27 2015May 30 2016The possibility of using nanoelectromechanical systems as a simulation tool for quantum many-body effects is explored. It is demonstrated that an array of electrostatically coupled nanoresonators can effectively simulate the Bose-Hubbard model without ... More
Metallicity determination in gas-rich galaxies with semiempirical methodsDec 04 2008A study of the precision of the semiempirical methods used in the determination of the chemical abundances in gas-rich galaxies is carried out. In order to do this the oxygen abundances of a total of 438 galaxies were determined using the electronic temperature, ... More
Heavy boson production through the collision of an ultrahigh-energy neutrino on a target nucleonOct 09 2003Apr 07 2004We discuss W and Z production through the deep inelastic neutrino-nucleon scattering in the context of the standard model SU(3)x SU(2)x U(1) of the strong and electroweak interactions. We find the cross section rates for the process neutrino + nucleon ... More
Tunneling with dissipation and decoherence for a large spinJan 11 2002Feb 18 2002We present rigorous solution of problems of tunneling with dissipation and decoherence for a spin of an atom or a molecule in an isotropic solid matrix. Our approach is based upon switching to a rotating coordinate system coupled to the local crystal ... More
Entropy production in systems with random transition ratesAug 07 2017We study the entropy production of a system with a finite number of states connected by random transition rates. The stationary entropy production, driven out of equilibrium both by asymmetric transition rates and by an external probability current, is ... More
K2-99: a subgiant hosting a transiting warm Jupiter in an eccentric orbit and a long-period companionSep 01 2016Sep 28 2016We report the discovery from K2 of a transiting planet in an 18.25-d, eccentric (0.19$\pm$ 0.04) orbit around K2-99, an 11th magnitude subgiant in Virgo. We confirm the planetary nature of the companion with radial velocities, and determine that the star ... More
Bayesian evidence for $α$-attractor dark energy modelsMay 02 2019Jul 02 2019Dark energy models with tracker properties have gained attention due to the large range of initial conditions leading to the current value of the dark energy density parameter. A well-motivated family of these models are the so-called $\alpha$-attractors, ... More
Rational points in the moduli space of genus twoFeb 21 2019We build a database of genus 2 curves defined over $\mathbb Q$ which contains all curves with minimal absolute height $h \leq 5$, all curves with moduli height $\mathfrak h \leq 20$, and all curves with extra automorphisms in standard form $y^2=f(x^2)$ ... More
Non-crossing Monotone Paths and Binary Trees in Edge-ordered Complete Geometric GraphsMar 15 2017May 03 2017An edge-ordered graph is a graph with a total ordering of its edges. A path $P=v_1v_2\ldots v_k$ in an edge-ordered graph is called increasing if $(v_iv_{i+1}) > (v_{i+1}v_{i+2})$ for all $i = 1,\ldots,k-2$; it is called decreasing if $(v_iv_{i+1}) < ... More
Canonical single field slow-roll inflation with a non-monotonic tensor-to-scalar ratioDec 09 2015Apr 25 2016We take a pragmatic, model independent approach to single field slow-roll canonical inflation by imposing conditions, not on the potential, but on the slow-roll parameter $\epsilon(\phi)$ and its derivatives $\epsilon^{\prime }(\phi)$ and $\epsilon^{\prime\prime ... More
Testing Hybrid Natural Inflation with BICEP2Apr 04 2014Jul 25 2014We analyse Hybrid Natural Inflation in view of the recent results for the tensor index reported by BICEP2. We find that it predicts a large running of the scalar spectrum which is potentially detectable by large scale structure and $21\, \mathrm{cm} $ ... More
The Chromatic Number of the Disjointness Graph of the Double ChainNov 15 2017May 06 2018Let $P$ be a set of $n$ points in general position in the plane. Consider all the straight line segments with endpoints in $P$. Suppose that these segments are colored with the rule that disjoint segments receive different colors. In this paper we show ... More
Counting the Number of Crossings in Geometric GraphsApr 24 2019A geometric graph is a graph whose vertices are points in general position in the plane and its edges are straight line segments joining these points. In this paper we give an $O(n^2 \log n)$ algorithm to compute the number of pairs of edges that cross ... More
Optimal Grid Drawings of Complete Multipartite Graphs and an Integer Variant of the Algebraic ConnectivityAug 27 2018How to draw the vertices of a complete multipartite graph $G$ on different points of a bounded $d$-dimensional integer grid, such that the sum of squared distances between vertices of $G$ is (i) minimized or (ii) maximized? For both problems we provide ... More
On the 2-colored crossing numberAug 18 2019Sep 11 2019Let $D$ be a straight-line drawing of a graph. The rectilinear 2-colored crossing number of $D$ is the minimum number of crossings between edges of the same color, taken over all possible 2-colorings of the edges of $D$. First, we show lower and upper ... More
Critical Point in Self-Organized Tissue GrowthNov 06 2017Apr 25 2018We present a theory of pattern formation in growing domains inspired by biological examples of tissue development. Gradients of signaling molecules regulate growth, while growth changes these graded chemical patterns by dilution and advection. We identify ... More
Zapponi-orientable dessins d'enfantsSep 16 2019Almost two decades ago Zapponi introduced a notion of orientability of a clean dessin d'enfant, based on an orientation of the embedded bipartite graph. We extend this concept, which we call Z-orientability to distinguish it from the traditional topological ... More
Quantum-Classical Transition of the Escape Rate of a Uniaxial Spin System in an Arbitrarily Directed FieldMay 06 1998Jun 05 1998The escape rate \Gamma of the large-spin model described by the Hamiltonian H = -DS_z^2 - H_zS_z - H_xS_x is investigated with the help of the mapping onto a particle moving in a double-well potential U(x). The transition-state method yields $\Gamma$ ... More
Dipolar ordering in Fe8?Apr 13 2000Jan 18 2001We show that the low-temperature physics of molecular nanomagnets, contrary to the prevailing one-molecule picture, must be determined by the long-range magnetic ordering due to many-body dipolar interactions. The calculations here performed, using Ewald's ... More
Understanding individual human mobility patternsJun 07 2008Despite their importance for urban planning, traffic forecasting, and the spread of biological and mobile viruses, our understanding of the basic laws governing human motion remains limited thanks to the lack of tools to monitor the time resolved location ... More
Explorability and the origin of Network Sparsity in Living SystemsDec 30 2016Feb 02 2017The increasing volume of ecologically and biologically relevant data has revealed a wide collection of emergent patterns in living systems. Analyzing different datasets, ranging from metabolic gene-regulatory to species interaction networks, we find that ... More
Signatures of Neutrino Cooling in the SN1987A ScenarioFeb 25 2014Apr 29 2014The neutrino signal from SN1987A confirmed the core-collapse scenario and the possible formation of a neutron star. Although this compact object has eluded all observations, theoretical and numerical developments have allowed a glimpse of the fate of ... More
Spontaneous decay in arbitrary cavity sizeNov 01 2017We consider a complete study of the influence of the cavity size on the spontaneous decay of an atom excited state, roughly approximated by a harmonic oscillator. We confine the oscillator-field system in a spherical cavity of radius $R$, perfectly reflective, ... More
Heavy Quark Spin Symmetry and SU(3)-Flavour Partners of the X(3872)Nov 29 2012In this work, an Effective Field Theory (EFT) incorporating light SU(3)-flavour and heavy quark spin symmetry is used to describe charmed meson-antimeson bound states. At Lowest Order (LO), this means that only contact range interactions among the heavy ... More
Collective computation in a network with distributed informationApr 17 2014We analyze a distributed information network in which each node has access to the information contained in a limited set of nodes (its neighborhood) at a given time. A collective computation is carried out in which each node calculates a value that implies ... More
The Two-loop Massless phi^4 Model in Non-translational Invariant DomainDec 08 2005We study the $\frac{\lambda}{4!}\phi^{4}$ massless scalar field theory in a four-dimensional Euclidean space, where all but one of the coordinates are unbounded. We are considering Dirichlet boundary conditions in two hyperplanes, breaking the translation ... More
Understanding the spreading patterns of mobile phone virusesJun 24 2009We model the mobility of mobile phone users to study the fundamental spreading patterns characterizing a mobile virus outbreak. We find that while Bluetooth viruses can reach all susceptible handsets with time, they spread slowly due to human mobility, ... More
Hidden charm molecules in a Finite VolumeDec 18 2013In the present paper we address the interaction of charmed mesons in hidden charm channels in a finite box. We use the interaction from a recent model based on heavy quark spin symmetry that predicts molecules of hidden charm in the infinite volume. The ... More
On the vertical equilibrium of the local Galactic disk and the search for disk dark matterMar 22 2011Estimates of the dynamical surface mass density at the solar Galactocentric distance are commonly derived assuming that the disk is in vertical equilibrium with the Galactic potential. This assumption has recently been called into question, based on the ... More
Core regulatory network motif underlies the ocellar complex patterning in Drosophila melanogasterApr 17 2014Dec 16 2014During organogenesis, developmental programs governed by Gene Regulatory Networks (GRN) define the functionality, size and shape of the different constituents of living organisms. Robustness, thus, is an essential characteristic that GRNs need to fulfill ... 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
Light Flavour and Heavy Quark Spin Symmetry in Heavy Meson MoleculesOct 19 2012May 17 2013We propose an effective field theory incorporating light SU(3)-flavour and heavy quark spin symmetry to describe charmed meson-antimeson bound states. At lowest order the effective field theory entails a remarkable simplification: it only involves contact ... More
Sum rules in the oscillator radiation processesOct 11 2004Sep 21 2005We consider the problem of an harmonic oscillator coupled to a scalar field in the framework of recently introduced dressed coordinates. We compute all the probabilities associated with the decay process of an excited level of the oscillator. Instead ... More
VizNet: Towards A Large-Scale Visualization Learning and Benchmarking RepositoryMay 12 2019Researchers currently rely on ad hoc datasets to train automated visualization tools and evaluate the effectiveness of visualization designs. These exemplars often lack the characteristics of real-world datasets, and their one-off nature makes it difficult ... More
The Fine-Tuning Problem in Little Higgs ModelsMay 09 2005Little Higgs models represent an alternative to Supersymmetry as a solution to the Hierarchy Problem. After introducing the main physical ideas of these models, we present the fine-tuning associated to the electroweak breaking in Little Higgs scenarios. ... More
On the regimes of charge reversalSep 19 2003Nov 19 2008Charge reversal of the planar electrical double layer is studied by means of a well known integral equations theory. By a numerical analysis, a diagram is constructed with the onset points of charge reversal in the space of the fundamental variables of ... More
Overcharging by macroions: above all, an entropy effectMay 15 2001May 16 2001Model macroion solutions next to a charged wall show interface \textit{true overcharging}, charge reversal and inversion, and layering. Macroion layering is present, even if the wall or the macroparticle are \textit{uncharged} or if the wall and macroions ... More
On the Number of Order Types in Integer Grids of Small SizeNov 06 2018Nov 16 2018Let $\{p_1,\dots,p_n\}$ and $\{q_1,\dots,q_n\}$ be two sets of $n$ labeled points in general position in the plane. We say that these two point sets have the same order type if for every triple of indices $(i,j,k)$, $p_k$ is above the directed line from ... More
Fossil group origins - VI. Global X-ray scaling relations of fossil galaxy clustersMar 20 2015Sep 29 2015We present the first pointed X-ray observations of 10 candidate fossil galaxy groups and clusters. With these Suzaku observations, we determine global temperatures and bolometric X-ray luminosities of the intracluster medium (ICM) out to $r_{500}$ for ... More
Semiparametric estimation for stationary processes whose spectra have an unknown poleAug 17 2005We consider the estimation of the location of the pole and memory parameter, \lambda ^0 and \alpha, respectively, of covariance stationary linear processes whose spectral density function f(\lambda) satisfies f(\lambda)\sim C| \lambda -\lambda ^0| ^{-\alpha} ... More
The effect of entropy on macroions adsorptionMar 25 2003We study macroion adsorption on planar surfaces, through a simple model. The importance of entropy in the interfacial phenomena is stressed. Our results are in qualitative agreement with available computer simulations and experimental results on charge ... More
A simple model for semipermeable membrane: Donnan equilibriumNov 03 2003We study a model for macroions in an electrolyte solution confined by a semipermeable membrane. The membrane finite thickness is considered and both membrane surfaces are uniformly charged. The model explicitly includes electrostatic and size particles ... More
Linking Economic Complexity, Institutions and Income InequalityMay 29 2015Jan 04 2017A country's mix of products predicts its subsequent pattern of diversification and economic growth. But does this product mix also predict income inequality? Here we combine methods from econometrics, network science, and economic complexity to show that ... More