Searching Arxiv, refresh for possibly better results.

Results for "A. Sevilla"

total 226250took 0.16s
Stokes theory of thin-film ruptureJun 11 2019The structure of the flow induced by the van der Waals destabilization of a non-wetting liquid film placed on a solid substrate is unraveled by means of theory and numerical simulations of the Stokes equations. Our analysis reveals that lubrication theory, ... More
Characterization of a Banach-Finsler manifold in terms of the algebras of smooth functionsAug 26 2011In this note we give sufficient conditions to ensure that the weak Finsler structure of a complete $C^k$ Finsler manifold $M$ is determined by the normed algebra $C_b^k(M)$ of all real-valued, bounded and $C^k$ smooth functions with bounded derivative ... More
Two-dimensional active motionMay 17 2019The diffusion in two dimensions of non-interacting active particles that follow an arbitrary motility pattern is considered for analysis. Accordingly, the transport equation is generalized to take into account an arbitrary distribution of scattered angles ... More
Temporal stability of free liquid threads with surface viscoelasticityMay 14 2018We analyse the effect of surface viscoelasticity on the temporal stability of a free cylindrical liquid jet coated with insoluble surfactant, extending the results of Timmermans & Lister (J. Fluid Mech., vol. 459, 2002, pp. 289-306). Our development requires, ... More
HDG-NEFEM with degree adaptivity for Stokes flowsJan 20 2018The NURBS-enhanced finite element method (NEFEM) combined with a hybridisable discontinuous Galerkin (HDG) approach is presented for the first time. The proposed technique completely eliminates the uncertainty induced by a polynomial approximation of ... More
Effective radical parametrization of trigonal curvesApr 13 2011Let $C$ be a non-hyperelliptic algebraic curve. It is known that its canonical image is the intersection of the quadrics that contain it, except when $C$ is trigonal (that is, it has a linear system of degree 3 and dimension 1) or isomorphic to a plane ... More
Constraints on Supersymmetric Flavour Models from b->s gammaJan 02 2008May 15 2008We consider the effects of departures from minimal flavour violations (MFV) in the context of CMSSM-like theories. Second and third generation off-diagonal elements in the Yukawa, sfermion, and trilinear mass matrices are taken to be non-zero at the GUT ... More
Active Particles Moving in Two-Dimensional Space with Constant Speed: Revisiting the Telegrapher's EquationMay 02 2014Starting from a Langevin description of active particles that move with constant speed in infinite two-dimensional space and its corresponding Fokker-Planck equation, we develop a systematic method that allows us to obtain the coarse-grained probability ... More
A locking-free face-centred finite volume (FCFV) method for linear elasticityJun 19 2018A face-centred finite volume (FCFV) method is proposed for the linear elasticity equation. The FCFV is a mixed hybrid formulation, featuring a system of first-order equations, that defines the unknowns on the faces (edges in two dimensions) of the mesh ... More
Generalized motion of level sets by functions of their curvatures on Riemannian manifoldsJul 13 2007Jan 28 2008We consider the generalized evolution of compact level sets by functions of their normal vectors and second fundamental forms on a Riemannian manifold M. The level sets of a function $u:M\to\mathbb{R}$ evolve in such a way whenever u solves an equation ... More
DNF - Galaxy photometric redshift by Directional Neighbourhood FittingNov 24 2015May 10 2016Wide field images taken in several photometric bands allow simultaneous measurement of redshifts for thousands of galaxies. A variety of algorithms to make this measurement have appeared in the last few years, the majority of which can be classified as ... More
Asymptotic estimates on the von Neumann inequality for homogeneous polynomialsApr 21 2015Jun 26 2015By the von Neumann inequality for homogeneous polynomials there exists a positive constant $C_{k,q}(n)$ such that for every $k$-homogeneous polynomial $p$ in $n$ variables and every $n$-tuple of commuting operators $(T_1, \dots, T_n)$ with $\sum_{i=1}^{n} ... More
A note on the symmetry of sequence spacesMay 28 2019We give a self-contained treatment of symmetric Banach sequence spaces and some of their natural properties. We are particularly interested in the symmetry of the norm and the existence of symmetric linear functionals. Many of the presented results are ... More
Hausdorff-Young type inequalities for vector-valued Dirichlet seriesMar 29 2019We study Hausdorff-Young inequalities for vector-valued Dirichlet series. These are inequalities that relate some norm of the coefficients $(a_{n})_n$ and the norm of the Dirichlet series in the Hardy space $\mathcal{H}_{p} (X)$. This leads us in a natural ... More
Start-up flow in shallow deformable microchannelsFeb 19 2019Microfluidic systems are usually fabricated with soft materials that deform due to the fluid stresses. The prediction and control of fluid flow inside these channels thus requires solving fluid-structure interaction problems. Recent experimental and theoretical ... More
A face-centred finite volume method for second-order elliptic problemsDec 17 2017This work proposes a novel finite volume paradigm, the face-centred finite volume (FCFV) method. Contrary to the popular vertex (VCFV) and cell (CCFV) centred finite volume methods, the novel FCFV defines the solution on the mesh faces (edges in 2D) to ... More
The nonlinear states of viscous capillary jets confined in the axial directionFeb 23 2018We report an experimental and theoretical study of the global stability and nonlinear dynamics of vertical jets of viscous liquid confined in the axial direction due to their impact on a bath of the same liquid. Previous works demonstrated that in the ... More
Natural break-up and satellite formation regimes of surfactant-laden liquid threadsMar 07 2019We report a numerical analysis of the unforced break-up of free cylindrical threads of viscous Newtonian liquid whose interface is coated with insoluble surfactants, focusing on the formation of satellite droplets. The initial conditions are harmonic ... More
Linear and quadratic temperature dependence of electronic specific heat for cupratesJan 09 2013We model cuprate superconductors as an infinite layered lattice structure which contains a fluid of paired and unpaired fermions. Paired fermions, which are the superconducting carriers, are considered as noninteracting zero spin bosons with a linear ... More
Specific heat of underdoped cuprate superconductors from a phenomenological layered Boson-Fermion modelJan 07 2016We adapt the Boson-Fermion superconductivity model to include layered systems such as underdoped cuprate superconductors. These systems are represented by an infinite layered structure containing a mixture of paired and unpaired fermions. The former, ... More
Towards NNLO accuracy for $\varepsilon'/\varepsilon$Nov 24 2016The quantity $\varepsilon'/\varepsilon$ measures direct CP violation in Kaon decays. Recent SM predictions show a $2.9\sigma$ tension with data, with the theoretical uncertainty dominating. As rapid progress on the lattice is bringing nonperturbative ... More
Dark and baryonic matter in the MareNostrum UniverseOct 20 2006Oct 21 2006We report some results from one of the largest hydrodynamical cosmological simulations of large scale structures that has been done up to date. The MareNostrum Universe SPH simulation consists of 2 billion particles (2 times 1024^3) in a cubic box of ... More
A Sneutrino NLSP in the $ν$CMSSMFeb 15 2009Mar 21 2009We extend the constrained minimal supersymmetric model (CMSSM) by adding a right-handed neutrino superfield ($\nu$CMSSM) which decouples close to the GUT scale. We study the effects of a right-handed neutrino on the low energy spectrum and focus on the ... More
Boson gas in a periodic array of tubesDec 15 2011We report the thermodynamic properties of an ideal boson gas confined in an infinite periodic array of channels modeled by two, mutually perpendicular, Kronig-Penney delta-potentials. The particle's motion is hindered in the x-y directions, allowing tunneling ... More
Composition operators on weighted spaces of holomorphic functions on $JB^{\ast}-$triplesMay 25 2018We characterise continuity of composition operators on weighted spaces of holomorphic functions $H_{v}(B_{X})$, where $B_{X}$ is the open unit ball of a Banach space which is homogeneous, that is, a $JB^{\ast}-$triple.
Bayesian regression of piecewise homogeneous Poisson processesFeb 17 2017In this paper, a Bayesian method for piecewise regression is adapted to handle counting processes data distributed as Poisson. A numerical code in Mathematica is developed and tested analyzing simulated data. The resulting method is valuable for detecting ... More
Nonintrusive proper generalised decomposition for parametrised incompressible flow problems in OpenFOAMJun 12 2019The computational cost of parametric studies currently represents the major limitation to the application of simulation-based engineering techniques in a daily industrial environment. This work presents the first nonintrusive implementation of the proper ... More
Cluster values for algebras of analytic functionsMay 16 2017The Cluster Value Theorem is known for being a weak version of the classical Corona Theorem. Given a Banach space $X$, we study the Cluster Value Problem for the ball algebra $A_u(B_X)$, the Banach algebra of all uniformly continuous holomorphic functions ... More
On the existence of birational surjective parametrizations of affine surfacesJun 01 2017In this paper we show that not all affine rational complex surfaces can be parametrized birationally and surjectively. For this purpose, we prove that, if S is an affine complex surface whose projective closure is smooth, a necessary condition for S to ... More
A superconvergent HDG method for Stokes flow with strongly enforced symmetry of the stress tensorFeb 26 2018This work proposes a superconvergent hybridizable discontinuous Galerkin (HDG) method for the approximation of the Cauchy formulation of the Stokes equation using same degree of polynomials for the primal and mixed variables. The novel formulation relies ... More
Generalized Ornstein-Uhlenbeck Model for Active MotionMay 24 2019We investigate a one-dimensional model of active motion, which takes into account the effects of persistent motion through a memory function in a dissipative-like term of the Generalized Langevin Equation for the particle swimming velocity. The model ... More
Monomial convergence on $\ell_r$May 13 2019For $1 < r \le 2$, we study the set of monomial convergence for spaces of holomorphic functions over $\ell_r$. For $ H_b(\ell_r)$, the space of entire functions of bounded type in $\ell_r$, we prove that $\mbox{mon} H_b(\ell_r)$ is exactly the Marcinkiewicz ... More
Dimensional crossover of a boson gas in multilayersJul 08 2010We obtain the thermodynamic properties for a non-interacting Bose gas constrained on multilayers modeled by a periodic Kronig-Penney delta potential in one direction and allowed to be free in the other two directions. We report Bose-Einstein condensation ... More
Precision test of a Fermion mass textureApr 09 2001Jun 05 2001Texture zeros in the quark Yukawa matrices generally lead to precise and simple expressions for CKM matrix elements in terms of ratios of quark masses. Using the new data on $b-$decays we test a particularly promising texture zero solution and show that ... More
Synchronization of Intermittent Behavior in Ensembles of Multistable Dynamical SystemsFeb 16 2015We propose a methodology to analyze synchronization in an ensemble of diffusively coupled multistable systems. First, we study how two bidirectionally coupled multistable oscillators synchronize and demonstrate the high complexity of the basins of attraction ... More
Dynamical complexity as a proxy for the network degree distributionJul 25 2018Sep 13 2018We explore the relation between the topological relevance of a node in a complex network and the individual dynamics it exhibits. When the system is weakly coupled, the effect of the coupling strength against the dynamical complexity of the nodes is found ... More
$S_3$ as a unified family theory for quarks and leptonsOct 01 2012We present an $S_3$-invariant extension of the SM which is able to account for the mixing both in the quark and the lepton sector. We focus here on the quark sector and present different realizations of the model, according to how many Higgs fields are ... More
Bose-Einstein condensation in multilayersDec 03 2009The critical BEC temperature $T_{c}$ of a non interacting boson gas in a layered structure like those of cuprate superconductors is shown to have a minimum $T_{c,m}$, at a characteristic separation between planes $a_{m}$. It is shown that for $a<a_{m}$, ... More
BEC, BCS and BCS-Bose Crossover Theories in Superconductors and SuperfluidsDec 16 2004Feb 23 2005For the Cooper/BCS model interaction in superconductors (SCs) it is shown: a) how BCS-Bose crossover picture transition temperatures Tc, defined self-consistently by both the gap and fermion-number equations, require unphysically large couplings to differ ... More
Recent Developments in CAD/analysis IntegrationOct 31 2012For linear elastic problems, it is well-known that mesh generation dominates the total analysis time. Different types of methods have been proposed to directly or indirectly alleviate this burden associated with mesh generation. We review in this paper ... More
The BCS-Bose Crossover TheorySep 05 2005Jan 23 2007We contrast {\it four} distinct versions of the BCS-Bose statistical crossover theory according to the form assumed for the electron-number equation that accompanies the BCS gap equation. The four versions correspond to explicitly accounting for two-hole-(2h) ... More
Quark sector of S3 models: classification and comparison with experimental dataApr 24 2013S3 models offer a low energy approach to describe the observed pattern of masses and mixing, of both quarks and leptons. In this work, we first revisit an S3 model with only one Higgs electroweak doublet, where the flavour symmetry must be broken in order ... More
The Dark Energy Survey Data Management SystemSep 30 2011The Dark Energy Survey (DES) is a project with the goal of building, installing and exploiting a new 74 CCD-camera at the Blanco telescope, in order to study the nature of cosmic acceleration. It will cover 5000 square degrees of the southern hemisphere ... More
Star/galaxy separation at faint magnitudes: Application to a simulated Dark Energy SurveyJun 21 2013May 13 2015We address the problem of separating stars from galaxies in future large photometric surveys. We focus our analysis on simulations of the Dark Energy Survey (DES). In the first part of the paper, we derive the science requirements on star/galaxy separation, ... More
A class of Hamilton-Jacobi equations on Banach-Finsler manifoldsJul 10 2014Dec 02 2014The concept of subdifferentiability is studied in the context of $C^1$ Finsler manifolds (modeled on a Banach space with a Lipschitz $C^1$ bump function). A class of Hamilton-Jacobi equations defined on $C^1$ Finsler manifolds is studied and several results ... More
Low-dimensional BECJun 28 2000Aug 30 2000The Bose-Einstein condensation (BEC) temperature $T_{c}$ of Cooper pairs (CPs) created from a very general interfermion interaction is determined for a {\it linear}, as well as the usual quadratic, energy {\it vs}% center-of-mass momentum dispersion relation. ... More
Test beam measurement of ams H35 HV-CMOS capacitively coupled pixel sensor prototypes with high-resistivity substrateDec 22 2017Dec 03 2018In the context of the studies of the ATLAS High Luminosity LHC programme, radiation tolerant pixel detectors in CMOS technologies are investigated. To evaluate the effects of substrate resistivity on CMOS sensor performance, the H35DEMO demonstrator, ... More
Polynomial integration on regions defined by a triangle and a conicMay 06 2010We present an efficient solution to the following problem, of relevance in a numerical optimization scheme: calculation of integrals of the type \[\iint_{T \cap \{f\ge0\}} \phi_1\phi_2 \, dx\,dy\] for quadratic polynomials $f,\phi_1,\phi_2$ on a plane ... More
Hyperelliptic curves with reduced automorphism group A5Sep 10 2012We study genus $g$ hyperelliptic curves with reduced automorphism group $A_5$ and give equations $y^2=f(x)$ for such curves in both cases where $f(x)$ is a decomposable polynomial in $x^2$ or $x^5$. For any fixed genus the locus of such curves is a rational ... More
Deciding trigonality of algebraic curvesMar 24 2011Let C be a non-hyperelliptic algebraic curve of genus at least 3. Enriques and Babbage proved that its canonical image is the intersection of the quadrics that contain it, except when C is trigonal (that is, it has a linear system of degree 3 and dimension ... More
Computation of unirational fieldsApr 10 2008One of the main contributions which Volker Weispfenning made to mathematics is related to Groebner bases theory. In this paper we present an algorithm for computing all algebraic intermediate subfields in a separably generated unirational field extension ... More
Building counterexamples to generalizations for rational functions of Ritt's decomposition theoremApr 10 2008The classical Ritt's Theorems state several properties of univariate polynomial decomposition. In this paper we present new counterexamples to Ritt's first theorem, which states the equality of length of decomposition chains of a polynomial, in the case ... More
Harmonically Trapped Quantum GasesMay 23 2002We solve the problem of a Bose or Fermi gas in $d$-dimensions trapped by $% \delta \leq d$ mutually perpendicular harmonic oscillator potentials. From the grand potential we derive their thermodynamic functions (internal energy, specific heat, etc.) as ... More
On decomposition of tame polynomials and rational functionsApr 10 2008In this paper we present algorithmic considerations and theoretical results about the relation between the orders of certain groups associated to the components of a polynomial and the order of the group that corresponds to the polynomial, proving it ... More
On Ritt's decomposition Theorem in the case of finite fieldsMar 27 2008Apr 10 2008A classical theorem by Ritt states that all the complete decomposition chains of a univariate polynomial satisfying a certain tameness condition have the same length. In this paper we present our conclusions about the generalization of these theorem in ... More
Decomposing replicable functionsMar 24 2008Mar 25 2008We describe an algorithm to decompose rational functions from which we determine the poset of groups fixing these functions.
Diffusion of active chiral particlesNov 19 2016The diffusion of chiral active Brownian particles in three-dimensional space is studied analytically, by consideration of the corresponding Fokker-Planck equation for the probability density of finding a particle at position $\boldsymbol{x}$ and moving ... More
Computation of unirational fields (extended abstract)Apr 10 2008In this paper we present an algorithm for computing all algebraic intermediate subfields in a separably generated unirational field extension (which in particular includes the zero characteristic case). One of the main tools is Groebner bases theory. ... More
Aplicacion de la descomposicion racional univariada a monstrous moonshine (in Spanish)May 15 2008This paper shows how to use Computational Algebra techniques, namely the decomposition of rational functions in one variable, to explore a certain set of modular functions, called replicable functions, that arise in Monstrous Moonshine. In particular, ... More
DMC-Net: Generating Discriminative Motion Cues for Fast Compressed Video Action RecognitionJan 11 2019May 07 2019Motion has shown to be useful for video understanding, where motion is typically represented by optical flow. However, computing flow from video frames is very time-consuming. Recent works directly leverage the motion vectors and residuals readily available ... More
Thermodynamics of low-dimensional trapped Fermi gasesDec 08 2016The effects of low dimensionality on the thermodynamics of a Fermi gas trapped by isotropic power law potentials are analyzed. Particular attention is given to different characteristic temperatures that emerge, at low dimensionality, in the thermodynamic ... More
Probability distributions for Poisson processes with pile-upOct 28 2013In this paper, two parametric probability distributions capable to describe the statistics of X-ray photon detection by a CCD are presented. They are formulated from simple models that account for the pile-up phenomenon, in which two or more photons are ... More
Tschirnhaus-Weierstrass curvesAug 22 2008Jun 09 2011We define the concept of Tschirnhaus-Weierstrass curve, named after the Weierstrass form of an elliptic curve and Tschirnhaus transformations. Every pointed curve has a Tschirnhaus-Weierstrass form, and this representation is unique up to a scaling of ... More
A Multi-component Matched Filter Cluster Confirmation Tool for eROSITA: Initial Application to the RASS and DES-SV DatasetsJun 20 2017We describe a multi-component matched filter cluster confirmation tool (MCMF) designed for the study of large X-ray source catalogs produced by the upcoming X-ray all-sky survey mission eROSITA. We apply the method to confirm a sample of 88 clusters with ... More
BCS and BEC Finally Unified: A Brief ReviewNov 21 2002Nov 28 2002We review efforts to unify both the Bardeen, Cooper and Schrieffer (BCS) and Bose-Einstein condensation (BEC) pictures of superconductivity. We have finally achieved this in terms of a "\textit{complete} boson-fermion (BF) model" (CBFM) that reduces in ... More
Enhancing the stability of the synchronization of multivariable coupled oscillatorsAug 27 2015Synchronization processes in populations of identical networked oscillators are in the focus of intense studies in physical, biological, technological and social systems. Here we analyze the stability of the synchronization of a network of oscillators ... More
The Dark Energy Survey Image Processing PipelineJan 09 2018The Dark Energy Survey (DES) is a five-year optical imaging campaign with the goal of understanding the origin of cosmic acceleration. DES performs a 5000 square degree survey of the southern sky in five optical bands (g,r,i,z,Y) to a depth of ~24th magnitude. ... More
Radical Parametrization of Algebraic Curves by Adjoint CurvesMay 21 2008Sep 20 2010We present algorithms for parametrizing by radicals an irreducible curve, not necessarily plane, when the genus is less o equal to 4 and they are defined over an algebraically closed field of characteristic zero. In addition, we also present an algorithm ... More
First Steps Towards Radical Parametrization of Algebraic SurfacesJun 07 2012Jun 11 2012We introduce the notion of radical parametrization of a surface, and we provide algorithms to compute such type of parametrizations for families of surfaces, like: Fermat surfaces, surfaces with a high multiplicity (at least the degree minus 4) singularity, ... More
Smoluchowski Diffusion Equation for Active Brownian SwimmersJan 28 2015Jan 31 2015We study the free diffusion in two dimensions of active-Brownian swimmers subject to passive fluctuations on the translational motion and to active fluctuations on the rotational one. The Smoluchowski equation is derived from a Langevin-like model of ... More
Rolle's theorem is either false or trivial in infinite-dimensional Banach spacesFeb 14 2000We prove the following new characterization of $C^p$ (Lipschitz) smoothness in Banach spaces. An infinite-dimensional Banach space $X$ has a $C^p$ smooth (Lipschitz) bump function if and only if it has another $C^p$ smooth (Lipschitz) bump function $f$ ... More
Phenomenology of flavon fields at the LHCNov 11 2009Mar 16 2010We study low energy constraints from flavour violating processes, production and decay at the LHC of a scalar field varphi (flavon) associated to the breaking of a non-supersymmetric Abelian family symmetry at the TeV scale. This symmetry is constrained ... More
Extendibility of bilinear forms on Banach sequence spacesDec 04 2012We study Hahn-Banach extensions of multilinear forms defined on Banach sequence spaces. We characterize $c_0$ in terms of extension of bilinear forms, and describe the Banach sequence spaces in which every bilinear form admits extensions to any superspace. ... More
Flavour constraints on scenarios with two or three heavy squark generationsJul 12 2012May 10 2013We re-assess constraints from flavour-changing neutral currents in the kaon system on supersymmetric scenarios with a light gluino, two heavy generations of squarks and a lighter third generation. We compute for the first time limits in scenarios with ... More
Approximation by smooth functions with no critical points on separable Banach spacesOct 27 2005We characterize the class of separable Banach spaces $X$ such that for every continuous function $f:X\to\mathbb{R}$ and for every continuous function $\epsilon:X\to\mathbb(0,+\infty)$ there exists a $C^1$ smooth function $g:X\to\mathbb{R}$ for which $|f(x)-g(x)|\leq\epsilon(x)$ ... More
Emergence of collective motion in a model of interacting Brownian particlesOct 13 2014By studying a system of Brownian particles, interacting only through a local social-like force (velocity alignment), we show that self-propulsion is not a necessary feature for the flocking transition to take place as long as underdamped particle dynamics ... More
Thermodynamics of the Relativistic Fermi gas in D DimensionsJul 27 2014The influence of spatial dimensionality and particle-antiparticle pair production on the thermodynamic properties of the relativistic Fermi gas, at finite chemical potential, is studied. Resembling a kind of phase transition, qualitatively different behaviors ... More
Impact of Delta mB_s on the determination of the unitary triangle and bounds on physics beyond the Standard ModelMar 15 2006Sep 13 2006We study the impact on the unitarity triangle of the Bs-bar{Bs} flavor oscillation data analyses being carried out at the Tevatron Run II. In the current version of this work we consider the first direct experimental bound on the mass difference Delta ... More
Spectra of weighted algebras of holomorphic functionsFeb 08 2008Feb 12 2008We consider weighted algebras of holomorphic functions on a Banach space. We determine conditions on a family of weights that assure that the corresponding weighted space is an algebra or has polynomial Schauder decompositions. We study the spectra of ... More
Summation of coefficients of polynomials on $\ell_{p}$ spacesSep 24 2013We investigate the summability of the coefficients of $m$-homogeneous polynomials and $m$-linear mappings defined on $\ell_{p}$-spaces. In our research we obtain results on the summability of the coefficients of $m$-linear mappings defined on $\ell_{p_{1}} ... More
The FE-I4 Telescope for particle tracking in testbeam experimentsMar 24 2016Jun 20 2016A testbeam telescope, based on ATLAS IBL silicon pixel modules, has been built. It comprises six planes of planar silicon sensors with 250 x 50 um^2 pitch, read out by ATLAS FE-I4 chips. In the CERN SPS H8 beamline (180 GeV pi+) a resolution of better ... More
Photometric redshifts and clustering of emission line galaxies selected jointly by DES and eBOSSSep 23 2015Nov 24 2015We present the results of the first test plates of the extended Baryon Oscillation Spectroscopic Survey. This paper focuses on the emission line galaxies (ELG) population targetted from the Dark Energy Survey (DES) photometry. We analyse the success rate, ... More
Farthest Neighbor: The Distant Milky Way Satellite Eridanus IINov 15 2016Feb 15 2017We present Magellan/IMACS spectroscopy of the recently-discovered Milky Way satellite Eridanus II (Eri II). We identify 28 member stars in Eri II, from which we measure a systemic radial velocity of $v_{\rm hel} = 75.6 \pm 1.3~\mbox{(stat.)} \pm 2.0~\mbox{(sys.)}~\mathrm{km\,s^{-1}}$ ... More
Imprint of DES super-structures on the Cosmic Microwave BackgroundOct 03 2016Nov 15 2016Small temperature anisotropies in the Cosmic Microwave Background can be sourced by density perturbations via the late-time integrated Sachs-Wolfe effect. Large voids and superclusters are excellent environments to make a localized measurement of this ... More
The Evolution of Active Galactic Nuclei in Clusters of Galaxies from the Dark Energy SurveyJun 21 2016Nov 03 2016The correlation between active galactic nuclei (AGN) and environment provides important clues to AGN fueling and the relationship of black hole growth to galaxy evolution. In this paper, we analyze the fraction of galaxies in clusters hosting AGN as a ... More
An extended catalog of galaxy-galaxy strong gravitational lenses discovered in DES using convolutional neural networksMay 25 2019We search Dark Energy Survey (DES) Year 3 imaging for galaxy-galaxy strong gravitational lenses using convolutional neural networks, extending previous work with new training sets and covering a wider range of redshifts and colors. We train two neural ... More
Testing the lognormality of the galaxy and weak lensing convergence distributions from Dark Energy Survey mapsMay 06 2016It is well known that the probability distribution function (PDF) of galaxy density contrast is approximately lognormal; whether the PDF of mass fluctuations derived from weak lensing convergence (kappa_WL) is lognormal is less well established. We derive ... More
Measuring Linear and Non-linear Galaxy Bias Using Counts-in-Cells in the Dark Energy Survey Science Verification DataJul 26 2018Oct 16 2018Non-linear bias measurements require a great level of control of potential systematic effects in galaxy redshift surveys. Our goal is to demonstrate the viability of using Counts-in-Cells (CiC), a statistical measure of the galaxy distribution, as a competitive ... More
Observation of Two New L4 Neptune Trojans in the Dark Energy Survey Supernova FieldsJul 18 2015We report the discovery of the eighth and ninth known Trojans in stable orbits around Neptune's leading Lagrange point, L4. The objects 2014 QO$_{441}$ and 2014 QP$_{441}$ were detected in data obtained during the 2013-14 and 2014-15 observing seasons ... More
Explosive first-order transition to synchrony in networked chaotic oscillatorsMar 29 2012Critical phenomena in complex networks, and the emergence of dynamical abrupt transitions in the macroscopic state of the system are currently a subject of the outmost interest. We report evidence of an explosive phase synchronization in networks of chaotic ... More
High-Performance Flexible Magnetic Tunnel Junctions for Smart Miniaturized InstrumentsApr 04 2018Flexible electronics is an emerging field in many applications ranging from in vivo biomedical devices to wearable smart systems. The capability of conforming to curved surfaces opens the door to add electronic components to miniaturized instruments, ... More
Dark Energy Survey Year 1 Results: Wide field mass maps via forward fitting in harmonic spaceMay 29 2019We present new wide-field weak lensing mass maps for the Year 1 Dark Energy Survey data, generated via a forward fitting approach. This method of producing maps does not impose any prior constraints on the mass distribution to be reconstructed. The technique ... More
Producing a BOSS-CMASS sample with DES imagingJun 04 2019We present a sample of galaxies with the Dark Energy Survey (DES) photometry that replicates the properties of the BOSS CMASS sample. The CMASS galaxy sample has been well characterized by the Sloan Digital Sky Survey (SDSS) collaboration and was used ... More
UV-Luminous, Star-Forming Hosts of z~2 Reddened Quasars in the Dark Energy SurveyJan 08 2018We present the first rest-frame UV population study of 17 heavily reddened, high-luminosity (E(B-V)$_{\rm{QSO}}\gtrsim$ 0.5; L$_{\rm{bol}}>$ 10$^{46}$ergs$^{-1}$) broad-line quasars at $1.5 < z < 2.7$. We combine the first year of deep, optical, ground-based ... More
Finding high-redshift strong lenses in DES using convolutional neural networksNov 09 2018Jan 23 2019We search Dark Energy Survey (DES) Year 3 imaging data for galaxy-galaxy strong gravitational lenses using convolutional neural networks. We generate 250,000 simulated lenses at redshifts > 0.8 from which we create a data set for training the neural networks ... More
Constraints on the redshift evolution of astrophysical feedback with Sunyaev-Zeldovich effect cross-correlationsApr 30 2019An understanding of astrophysical feedback is important for constraining models of galaxy formation and for extracting cosmological information from current and future weak lensing surveys. The thermal Sunyaev-Zel'dovich effect, quantified via the Compton-$y$ ... More
Monte Carlo Control Loops for cosmic shear cosmology with DES Year 1Jun 03 2019Weak lensing by large-scale structure is a powerful probe of cosmology and of the dark universe. This cosmic shear technique relies on the accurate measurement of the shapes and redshifts of background galaxies and requires precise control of systematic ... More
Simulation of the gamma-ray galactic distribution as seen by the AMS-2Nov 25 2004In this note, we report the results of a simulation of the galactic component of high energy gamma rays, as seen by the future AMS-02 experiment on-board the International Space Station. The purpose of AMS is to measure the Cosmic Ray spectra of numerous ... More
Optimizing the LSST Observing Strategy for Dark Energy Science: DESC Recommendations for the Wide-Fast-Deep SurveyNov 30 2018Dec 14 2018Cosmology is one of the four science pillars of LSST, which promises to be transformative for our understanding of dark energy and dark matter. The LSST Dark Energy Science Collaboration (DESC) has been tasked with deriving constraints on cosmological ... More
Improving Weak Lensing Mass Map Reconstructions using Gaussian and Sparsity Priors: Application to DES SVJan 26 2018Sep 26 2018Mapping the underlying density field, including non-visible dark matter, using weak gravitational lensing measurements is now a standard tool in cosmology. Due to its importance to the science results of current and upcoming surveys, the quality of the ... More