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Results for "Matias Barenstein"

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ProPublica's COMPAS Data RevisitedJun 11 2019In this paper I re-examine the COMPAS recidivism score and criminal history data collected by ProPublica in 2016, which has fueled intense debate and research in the nascent field of `algorithmic fairness' or `fair machine learning' over the past three ... More
ProPublica's COMPAS Data RevisitedJun 11 2019Jun 13 2019In this paper I re-examine the COMPAS recidivism score and criminal history data collected by ProPublica in 2016, which has fueled intense debate and research in the nascent field of `algorithmic fairness' or `fair machine learning' over the past three ... More
Extracting the Bs - anti-Bs mixing angle from B--> VV decays and comments on the puzzling B--> K* l+l- decayJul 16 2008Oct 16 2008Three different strategies to extract the weak mixing phase phi_s of the Bs system using B--> VV decays (Bs--> K* anti-K*, Bs--> phi anti-K* and Bs--> phi phi) are discussed. Those penguin-mediated decays are computed in the framework of a new combined ... More
On Nichols algebras of low dimensionApr 10 2000This is a contribution to the classification program of pointed Hopf algebras. We give a generalization of the quantum Serre relations and propose a generalization of the Frobenius-Lusztig kernels in order to compute Nichols algebras of diagonal group ... More
CKM angles from non-leptonic B decays using SU(3) flavour symmetryNov 04 2003We discuss the determination of the CKM angles gamma and alpha using recent data from non-leptonic B decays together with flavour symmetries. Penguin effects are controlled by means of the CP-averaged branching ratio B_d \to \pi^\pm K^\mp. The information ... More
The Polarization of the Cosmic Microwave BackgroundMay 15 2003May 15 2003We summarize the physical mechanism by which the Cosmic Microwave Background acquires a small degree of polarization. We discuss the imprint left by gravitational waves and the use of polarization as a test of the inflationary paradigm. We discuss some ... More
Searching for fluctuations in the IGM temperature using the Lyman alpha forestFeb 12 2001We propose a statistical method to search for fluctuations in the temperature of the intergalactic medium (IGM) using the Lyman $\alpha$ forest. The power on small scales ($\sim 25 \km/\s$) is used as a thermometer and fluctuations of this power are constrained. ... More
Low-energy neutrino-photon inelastic interactionsMay 18 1999The computation of the polarized amplitudes and cross section of the processes $\gamma\nu\to\gamma\gamma \nu$, $\gamma\gamma \to \gamma\nu\bar\nu$ and $\nu\bar\nu \to \gamma\gamma\gamma$ is described. We used an effective lagrangian approach for energies ... More
Speeding Up MCMC by Delayed Acceptance and Data SubsamplingJul 22 2015The complexity of Markov Chain Monte Carlo (MCMC) algorithms arises from the requirement of a likelihood evaluation for the full data set in each iteration. Payne and Mallick (2014) propose to speed up the Metropolis-Hastings algorithm by a delayed acceptance ... More
Status of new physics in CP violation and rare B decaysOct 16 2017Nov 10 2017We briefly report on some particular aspects of new physics searches concerning, on the one side, the CKM paradigm and, on the other, the global fit to rare $b\to s \ell\ell$ observables including lepton flavour universality ones. We put special emphasis ... More
Bs decays: CP asymmetries in left-right models with spontaneous CP violationMay 17 1999We present the contributions of new CP phases in CP asymmetries of two-body neutral $B_s$ decays coming from a left--right model with spontaneous CP violation. Large deviations from the Standard Model predictions can be accommodated in a natural way by ... More
Non-Gaussianities in models with a varying inflaton decay rateMay 30 2003We consider the expected level of primordial non-Gaussianities in models in which density perturbations are produced by spatial fluctuations in the decay rate of the inflaton. We consider both the non-Gaussianities resulting from the self-couplings of ... More
Fluctuations in the Cosmic Microwave BackgroundJun 08 1998In this thesis we investigate several aspects related to the theory of fluctuations in the Cosmic Microwave Background. We develop a new algorithm to calculate the angular power spectrum of the anisotropies which is two orders of magnitude faster than ... More
The effective chiral lagrangian of the MSM at one and two loop orderApr 23 1996The formalism of the matching conditions between transverse connected Green functions is extended to include the two next to leading corrections, namely the two-loop $M_{H}^{2}$ and the one-loop $1/M_{H}^{2}$ contributions to the coefficients of the electroweak ... More
Review: Accretion Disk TheoryMar 30 2012In this paper I review and discuss the basic concepts of accretion disks, focused especially on the case of accretion disks around black holes. The well known alpha-model is revisited, showing the strengths and weaknesses of the model. Other turbulent ... More
Exchange rings and real rank zero C*-algebras associated with finitely separated graphsMay 12 2017We introduce a generalisation of Condition (K) to finitely separated graphs and show that it is equivalent to essential freeness of the associated partial action as well as the exchange property of any of the associated tame algebras. As a consequence, ... More
On the S-wave pollution of B-> K* l+l- observablesSep 07 2012Sep 14 2012It has been argued recently that transverse asymmetries that are expected to be shielded from the presence of the S-wave (Kpi) pairs originating from the decay of a scalar K0* meson, are indeed affected by this pollution due to the impossibility to extract ... More
Minimizing interference in ad-hoc networks with bounded communication radiusFeb 14 2011Jun 29 2012We consider a topology control problem in which we are given a set of $n$ sensors in the plane and we would like to assign a communication radius to each of them. The radii assignment must generate a strongly connected network and have low receiver-based ... More
Nonparametric geometric outlier detectionNov 13 2018Outlier detection is a major topic in robust statistics due to the high practical significance of anomalous observations. Many existing methods are, however, either parametric or cease to perform well when the data is far from linearly structured. In ... More
Merging Flavour Symmetries with QCD Factorisation for B-->KK DecaysJan 15 2007The interplay between flavour symmetries connecting Bs-->KK decays with the recently measured Bd--> K0 anti-K0 decay and QCD Factorisation opens new strategies to describe the decays Bs--> K0 anti-K0 and Bs--> K+ K- in the SM and in supersymmetry. A new ... More
The Angular Distribution of B0-> K*0(->K-pi+)l+l- at Large Recoil in and Beyond the SMNov 23 2005We discuss, in detail, the K* polarization states in the exclusive B meson decay B0-> K*0(-> K-pi+)l^+l^- (l=e, \mu, \tau) in the low dilepton mass region. We focus on the study of the angular distribution of this decay that provides valuable information ... More
Impact of B physics on model building and vice versa: an exampleSep 27 2002We motivate that the start-up of the B factories has opened a new precision flavour physics era, with an important effect on model building. Using as an example a left-right model with spontaneous CP violation, we will show how the inclusion of the new ... More
The nature of the E-B decomposition of CMB polarizationJun 10 2001We present a derivation of the transformation between the Q and U Stokes parameters and the E and B scalar and pseudo-scalar fields. We emphasize the geometrical properties that such transformation must satisfy. We present the E and B decomposition of ... More
Model independent sum rules for B-> pi K decaysMay 11 2001We provide a set of sum rules relating CP-averaged branching ratios and CP-asymmetries of the $B \to \pi K$ modes. They prove to be useful as a mechanism to `test' experimental data given our expectations of the size of isospin breaking. A set of observables ... More
Lensing of the CMB: Non Gaussian aspectsOct 27 1999Jun 22 2000We study the generation of CMB anisotropies by gravitational lensing on small angular scales. We show these fluctuations are not Gaussian. We prove that the power spectrum of the tail of the CMB anisotropies on small angular scales directly gives the ... More
Polarization of the Microwave Background in Reionized ModelsAug 09 1996Nov 20 1996I discuss the physics of polarization in models with early reionization. For sufficiently high optical depth to recombination the polarization is boosted on large scales while it is suppressed on smaller scales. New peaks appear in the polarization power ... More
On nuclearity and exactness of the tame C*-algebras associated with finitely separated graphsMay 12 2017We introduce a graph theoretic property called Condition (N) for finitely separated graphs and prove that it is equivalent to both nuclearity and exactness of the associated universal tame graph C*-algebra.
Commutator expansions in NMR diffusometryAug 18 2014In this paper commutator expansions for solving the Bloch-Torrey's equation are derived. An exact solution for free diffusion in a constant magnetic field gradient is found. Furthermore the moments of the signal in the short gradient pulse limit for spins ... More
Determination of gamma and alpha from non-leptonic B decays with SU(3) flavour symmetryJun 06 2003Jun 30 2003We describe in detail the method we have used to determine the CKM angles gamma, alpha and beta using flavour symmetries between non-leptonic B decays. This method is valid in the context of the SM but also in presence of New Physics not affecting the ... More
A fermiophobic SU(2)xSU(2)xU(1) extension of the Standard ModelMay 21 1997A new type of gauge extension of the SM is proposed. It is based on a SU(2)xSU(2)xU(1) group with the peculiarity that the gauge bosons of the extra SU(2) do not couple to fermions. This feature relaxes some of the constraints on the masses of the new ... More
Two Datasets of Questions and Answers for Studying the Development of Cross-platform Mobile Applications using Xamarin FrameworkDec 27 2017Jul 09 2018A cross-platform mobile application is an application that runs on multiple mobile platforms (Android, iOS). Several frameworks, have been proposed to simplify the development of cross-platform mobile applications and, therefore, to reduce development ... More
CMB Polarization ExperimentsSep 26 1997We discuss the analysis of polarization experiments with particular emphasis on those that measure the Stokes parameters on a ring on the sky. We discuss the ability of these experiments to separate the $E$ and $B$ contributions to the polarization signal. ... More
Modeling catastrophic deaths using EVT with a microsimulation approach to reinsurance pricingOct 31 2013Recently, a marked Poisson process (MPP) model for life catastrophe risk was proposed in [6]. We provide a justification and further support for the model by considering more general Poisson point processes in the context of extreme value theory (EVT), ... More
A perturbation basis for calculating NMR DiffusometryAug 27 2013An approximative method for solving the Bloch-Torrey equation in general porous media is presented. The method expand the boundaries defining the porous media using electrostatic charges. As a result the eigenvalue problem of the Laplace operator in a ... More
Markovian Random Iterations of MapsMay 24 2019In this paper, we study Markovian random iterations of maps on standard measurable spaces. We establish a one-to-one correspondence between stationary measures and a certain class of invariant measures of a Markovian random iteration, extending a similar ... More
Markovian Random Iterations of MapsMay 24 2019May 27 2019In this paper, we study Markovian random iterations of maps on standard measurable spaces. We establish a one-to-one correspondence between stationary measures and a certain class of invariant measures of a Markovian random iteration, extending a similar ... More
Markovian Random Iterations of MapsMay 24 2019Jun 05 2019In this paper, we study Markovian random iterations of maps on standard measurable spaces. We establish a one-to-one correspondence between stationary measures and a certain class of invariant measures of a Markovian random iteration, extending a similar ... More
Indecomposable racks of order p^2Mar 15 2002We classify indecomposable racks of order p^2 (p a prime). There are 2p^2 - 2p - 2 isomorphism classes, among which 2p^2 - 3p - 1 correspond to quandles. In particular, we prove that an indecomposable quandle of order p^2 is affine (=Alexander). One of ... More
Pointed Hopf algebras of dimension 32Oct 02 2001We give a complete classification of the 32-dimensional pointed Hopf algebras over an algebraically closed field k with characteristic different from 2. It turns out that there are infinite families of isomorphism classes of pointed Hopf algebras of dimension ... More
Astor: Exploring the Design Space of Generate-and-Validate Program Repair beyond GenProgFeb 09 2018Jan 23 2019During last years, researches have proposed novel repair approaches that automatically generate patches for repairing software bugs. Repair approaches can be loosely characterized along the main design philosophy such generate- and-validate or synthesis-based. ... More
Complete connections on fiber bundlesDec 11 2015Jan 10 2017Every smooth fiber bundle admits a complete (Ehresmann) connection. This result appears in several references, with a proof on which we have found a gap, that does not seem possible to remedy. In this note we provide a definite proof for this fact, explain ... More
Mining Software Repair Models for Reasoning on the Search Space of Automated Program FixingNov 14 2013This paper is about understanding the nature of bug fixing by analyzing thousands of bug fix transactions of software repositories. It then places this learned knowledge in the context of automated program repair. We give extensive empirical results on ... More
Testing the Dark Matter Annihilation Model for the WMAP HazeApr 07 2010Mar 07 2011Analyses have found a "haze" of anomalous microwave emission surrounding the Galactic Center in the WMAP sky maps. A recent study using Fermi data detected a similar haze in the gamma-ray. Several studies have modeled these hazes as radiation from the ... More
On Loops in InflationDec 14 2009We study loop corrections to correlation functions of inflationary perturbations. Previous calculations have found that the two-point function can have a logarithmic running of the form log(k/mu), where k is the wavenumber of the perturbation, and mu ... More
Distance determination to 12 Type II Supernovae using the Expanding Photosphere MethodOct 30 2008We used early time photometry and spectroscopy of 12 Type II plateau Supernovae (SNe IIP) to derive their distances using the Expanding Photosphere Method (EPM). We performed this study using two sets of Type II supernovae (SNe II) atmosphere models (E96, ... More
Minimum Number of Fox Colors for Small PrimesJan 08 2010Apr 09 2011This article concerns exact results on the minimum number of colors of a Fox coloring over the integers modulo r, of a link with non-null determinant. Specifically, we prove that whenever the least prime divisor of the determinant of such a link and the ... More
Causality and Primordial Tensor ModesJan 08 2009We introduce the real space correlation function of $B$-mode polarization of the cosmic microwave background (CMB) as a probe of superhorizon tensor perturbations created by inflation. By causality, any non-inflationary mechanism for gravitational wave ... More
The Small-Scale Power Spectrum of Cold Dark MatterApr 05 2005May 13 2005One of the best motivated hypotheses in cosmology states that most of the matter in the universe is in the form of weakly-interacting massive particles that decoupled early in the history of the universe and cooled adiabatically to an extremely low temperature. ... More
Synchronization in Complex Networks: a Comment on two recent PRL papersJul 20 2005Aug 11 2005I show that the conclusions of [Hwang, Chavez, Amann, & Boccaletti, PRL 94, 138701 (2005); Chavez, Hwang, Amann, Hentschel, & Boccaletti, PRL 94, 218701 (2005)] are closely related to those of previous publications.
CMB 3-point functions generated by non-linearities at recombinationMay 21 2004Sep 15 2004We study the 3-point functions generated at recombination in the squeezed triangle limit, when one mode has a wavelength much larger than the other two and is outside the horizon. The presence of the long wavelength mode cannot change the physics inside ... More
Separating the Early Universe from the Late Universe: cosmological parameter estimation beyond the black boxJul 02 2002Sep 17 2002We present a method for measuring the cosmic matter budget without assumptions about speculative Early Universe physics, and for measuring the primordial power spectrum P*(k) non-parametrically, either by combining CMB and LSS information or by using ... More
New CMB constraints on the cosmic matter budget: trouble for nucleosynthesis?Apr 28 2000Sep 20 2000We compute the joint constraints on ten cosmological parameters from the latest CMB measurements. The lack of a significant second acoustic peak in the latest Boomerang and Maxima data favors models with more baryons than Big Bang nucleosynthesis predicts, ... More
Current cosmological constraints from a 10 parameter CMB analysisFeb 04 2000Oct 03 2000We compute the constraints on a ``standard'' 10 parameter cold dark matter (CDM) model from the most recent CMB and data and other observations, exploring 30 million discrete models and two continuous parameters. Our parameters are the densities of CDM, ... More
Lensing Induced Cluster Signatures in Cosmic Microwave BackgroundJul 19 1999We show that clusters of galaxies induce step-like wiggles on top of the cosmic microwave background (CMB). The direction of the wiggle is parallel to the large scale gradient of CMB allowing one to isolate the effect from other small scale fluctuations. ... More
Some Remarks on the Matching ConditionsJul 14 1994Aug 20 1994We analyze the matching conditions to determine the values that the ${\cal O}(p^4)$ coefficients of an Effective Chiral Lagrangian take in the Standard Model in the limit of a large Higgs mass, pointing out a number of subtleties that appear to have gone ... More
Spectrum of Relativistic Fermions in a 2d Doped LatticeApr 21 1992Motivated by some previous work on fermions on random lattices and by suggestions that impurities could trigger parity breaking in 2d crystals, we have analyzed the spectrum of the Dirac equation on a two dimensional square lattice where sites have been ... More
CMB Anisotropies from a Gradient ModeSep 16 2014Apr 20 2015A linear gradient mode must have no observable dynamical effect on short distance physics. We confirm this by showing that if there was such a gradient mode extending across the whole observable Universe, it would not cause any hemispherical asymmetry ... More
Neutrino clustering around spherical dark matter halosOct 24 2013Jun 04 2014Cold dark matter halos form within a smoothly distributed background of relic neutrinos -- at least some of which are massive and non-relativistic at late times. We calculate the accumulation of massive neutrinos around spherically collapsing cold dark ... More
Characterisation and representation of non-dissipative electromagnetic medium with a double light coneMar 28 2012We study Maxwell's equations on a 4-manifold N with a medium that is non-dissipative and has a linear and pointwise response. In this setting, the medium can be represented by a suitable (2,2)-tensor on the 4-manifold N. Moreover, in each cotangent space ... More
Affinity Prediction in Online Social NetworksAug 12 2014Link prediction is the problem of inferring whether potential edges between pairs of vertices in a graph will be present or absent in the near future. To perform this task it is usual to use information provided by a number of available and observed vertices/edges. ... More
Do Mobile Developers Ask on Q&A Sites About Error Codes Thrown by a Cross-Platform App Development Framework? An Empirical StudyJan 22 2018During last years development frameworks have emerged to make easier the development and maintenance of cross-platform mobile applications. Xamarin framework is one of them: it takes as input an app written in C# and produces native code for Android, ... More
XamForumDB: a dataset for studying Q&A about cross-platform mobile applications developmentMar 10 2017Android and iSO are the two mobile platforms present in almost all smartphones build during last years. Developing an application that targets both platforms is a challenge. A traditional way is to build two different apps, one in Java for Android, the ... More
Boundary control of elliptic solutions to enforce local constraintsOct 15 2012We present a constructive method to devise boundary conditions for solutions of second-order elliptic equations so that these solutions satisfy specific qualitative properties such as: (i) the norm of the gradient of one solution is bounded from below ... More
Asymptotic and coarse Lipschitz structures of quasi-reflexive Banach spacesMay 01 2017In this note, we extend to the setting of quasi-reflexive spaces a classical result of N. Kalton and L. Randrianarivony on the coarse Lipschitz structure of reflexive and asymptotically uniformly smooth Banach spaces. As an application, we show for instance, ... More
On the Relative Projective SpaceOct 20 2017Dec 03 2018Let $(\mathcal C,\otimes,\mathbb 1)$ be an abelian symmetric monoidal category satisfying certain exactness conditions. In this paper we define a presheaf $\mathbb P^{n}_{\mathcal C}$ on the category of commutative algebras in $\mathcal C$ and we prove ... More
Complete connections on fiber bundlesDec 11 2015Every fiber bundle admits a complete (Ehresmann) connection. After a first published incorrect proof, this has appeared in several other references, always relying in a more ellaborated argument, that we have found to be incorrect too. We present here ... More
Random products of maps synchronizing on averageFeb 06 2018Feb 09 2018We present a necessary and sufficient condition for a random product of maps on a compact metric space to be (strongly) synchronizing on average.
Orlicz spaces and the large scale geometry of Heintze groupsNov 24 2014We consider an Orlicz space based cohomology for metric (measured) spaces with bounded geometry. We prove the quasi-isometry invariance for a general Young function. In the hyperbolic case, we prove that the degree one cohomology can be identified with ... More
The Mildly Non-Linear Regime of Structure FormationSep 22 2011Mar 28 2012We present a simple physically motivated picture for the mildly non-linear regime of structure formation, which captures the effects of the bulk flows. We apply this picture to develop a method to significantly reduce the sample variance in cosmological ... More
The Effective Field Theory of Multifield InflationSep 10 2010Jul 24 2012We generalize the Effective Field Theory of Inflation to include additional light scalar degrees of freedom that are in their vacuum at the time the modes of interest are crossing the horizon. In order to make the scalars light in a natural way we consider ... More
Higher-order moments of the lensing shear and other spin two fieldsAug 03 2002Oct 12 2002We present a method for defining higher-order moments of a spin-2 field on the sky using the transformation properties of these statistics under rotation and parity. For the three-point function of the cosmic shear we show that the eight logically possible ... More
CMBFAST for spatially closed universesNov 11 1999We extend the cosmological linear perturbation theory code CMBFAST to closed geometries. This completes the implementation of CMBFAST to all types of geometries and allows the user to perform an unlimited search in the parameter space of models. This ... More
Reconstructing Projected Matter Density from Cosmic Microwave BackgroundOct 16 1998Gravitational lensing distorts the cosmic microwave background (CMB) anisotropies and imprints a characteristic pattern onto it. The distortions depend on the projected matter density between today and redshift $z \sim 1100$. In this paper we develop ... More
Polarization of Microwave Background: Statistical and Physical PropertiesMay 02 1998We discuss statistical and physical properties of cosmic microwave background polarization, both in Fourier and in real space. The latter allows for a more intuitive understanding of some of the geometric signatures. We present expressions that relate ... More
Testing the Standard Model with Bs-> K^+ K^- DecaysApr 01 2004Jun 12 2004In the limit of flavor SU(3) symmetry, the amplitudes for Bd->pi^+\pi^- and Bs-> K^+ K^- are related to one another. Taking the values of the weak phases beta and gamma from independent measurements, the ratio Rds=BR(Bs-> K^+K^-)/BR(Bd->pi^+ pi^-) and ... More
Direct Signature of Evolving Gravitational Potential from Cosmic Microwave BackgroundNov 08 1998We show that time dependent gravitational potential can be directly detected from the cosmic microwave background (CMB) anisotropies. The signature can be measured by cross-correlating the CMB with the projected density field reconstructed from the weak ... More
Measuring Dark Matter Power Spectrum from Cosmic Microwave BackgroundOct 06 1998We propose a method to extract the projected power spectrum of density perturbations from the distortions in the cosmic microwave background (CMB). The distortions are imprinted onto the CMB by the gravitational lensing effect and can be extracted using ... More
Gravitational Lensing Effect on Cosmic Microwave Background PolarizationMar 13 1998We investigate the effect of gravitational lensing by matter distribution in the universe on the cosmic microwave background (CMB) polarization power spectra and temperature-polarization cross-correlation spectrum. As in the case of temperature spectrum ... More
RENORMALIZATION and the EQUIVALENCE THEOREM: ON-SHELL SCHEMEJan 12 1995We perform an exhaustive analysis of the Equivalence Theorem both in the minimal Standard Model and in an Effective Electroweak Chiral Lagrangian up to ${\cal O}(p^4)$. We have considered the leading corrections to the usual prescription consisting in ... More
A new relation between the zero of $A_{FB}$ in $B^0 \to K^* μ^+μ^-$ and the anomaly in $P_5^\prime$Feb 27 2014We present two exact relations, valid for any dilepton invariant mass region (large and low-recoil) and independent of any effective Hamiltonian computation, between the observables $P_i$ and $P_i^{CP}$ of the angular distribution of the 4-body decay ... More
On the Renormalization of the Effective Field Theory of Large Scale StructuresJan 30 2013Feb 03 2013Standard perturbation theory (SPT) for large-scale matter inhomogeneities is unsatisfactory for at least three reasons: there is no clear expansion parameter since the density contrast is not small on all scales; it does not fully account for deviations ... More
ASTOR: Evolutionary Automatic Software Repair for JavaOct 24 2014Context: During last years, many automatic software repair approaches have been presented by the software engineering research community. According to the corresponding papers, these approaches are able to repair real defects from open source projects. ... More
Double Soft Limits of Cosmological CorrelationsSep 22 2014Apr 20 2015Correlation functions of two long-wavelength modes with several short-wavelength modes are shown to be related to lower order correlation functions, using the background wave method, and independently, by exploiting symmetries of the wavefunction of the ... More
Conformal dimension and canonical splittings of hyperbolic groupsJan 28 2013Nov 03 2013We prove a general criterion for a metric space to have conformal dimension one. The conditions are stated in terms of the existence of enough local cut points in the space. We then apply this criterion to the boundaries of hyperbolic groups and show ... More
Coloring Planar Homothets and Three-Dimensional HypergraphsJan 03 2011Jun 29 2012The inclusion relation between simple objects in the plane may be used to define geometric set systems, or hypergraphs. Properties of various types of colorings of these hypergraphs have been the subject of recent investigations, with applications to ... More
Improved estimation of cluster mass profiles from the cosmic microwave backgroundMay 14 2008Sep 23 2008We develop a new method for reconstructing cluster mass profiles and large-scale structure from the cosmic microwave background (CMB). By analyzing the likelihood of CMB lensing, we analytically prove that standard quadratic estimators for CMB lensing ... More
Constraints on Binary Black Hole Populations from LIGO-Virgo DetectionsJun 27 2018Jan 17 2019We reanalyse the LIGO-Virgo strain data of the 10 binary black hole mergers reported to date and compute the likelihood function in terms of chirp mass, mass ratio and effective spin. We discuss the strong degeneracy between mass ratio and spin for the ... More
The Effective Field Theory of Large-Scale Structure in the presence of Massive NeutrinosJul 15 2017Jul 20 2017We develop a formalism to analytically describe the clustering of matter in the mildly non-linear regime in the presence of massive neutrinos. Neutrinos, whose free streaming wavenumber ($k_{\rm fs}$) is typically longer than the non-linear scale ($k_{\rm ... More
Electromagnetic fields from contact formsNov 12 2008In this short note we prove that every contact form on a 3-manifold M induces a solution to Maxwell's equations on M.
On the subdivision of small categoriesJul 11 2007Feb 22 2008We present an intrinsic and concrete development of the subdivision of small categories, give some simple examples and derive its fundamental properties. As an application, we deduce an alternative way to compare the homotopy categories of spaces and ... More
(2+)-replication and the Baby MonsterOct 03 2017Jun 19 2018The definitions of replicable and completely replicable functions are intimately related to the Hecke operators for the modular group. We define the notions of "$(2+)$-replicable" and "completely $(2+)$-replicable" functions by considering the Hecke operators ... More
Role of Van der Waals forces in graphene adsorption over Pd, Pt and NiFeb 28 2013We report ab initiocomputations with the Vienna ab Initio Simulation Package (VASP) aimed at elucidating the adsorption mechanism of graphene-like structures on (111) Pd, Pt, and Ni surfaces. To study the adsorption properties, we simulate an already-formed ... More
Towards the quality improvement of cross-platform mobile applicationsJan 24 2017Mar 02 2017During last ten years, the number of smartphones and mobile applications has been constantly growing. Android, iOS and Windows Mobile are three mobile platforms that cover almost all smartphones in the world in 2017. Developing a mobile app involves first ... More
Convergence of a one dimensional Cahn-Hilliard equation with degenerate mobilityOct 16 2015We consider a one dimensional periodic forward-backward parabolic equation, regularized by a non-linear fourth order term of order $\epsilon^2\ll 1$. This equation is known in the literature as Cahn-Hilliard equation with degenerate mobility. Under the ... More
Quantum effects in the scattering by the magnetic field of a solenoidFeb 07 2002We present a relativistic quantum calculation at first order in perturbation theory of the differential cross section for a Dirac particle scattered by the magnetic field of a solenoid. The resulting cross section is symmetric in the scattering angle ... More
Lie Groupoids and their OrbispacesDec 30 2012Jun 10 2013This is a concise introduction to the theory of Lie groupoids, with emphasis in their role as models for orbispaces. After some preliminaries, we review the foundations on Lie groupoids, and we carefully study equivalences and proper groupoids. Orbispaces ... More
Solid-liquid composite structures: elastic beams with embedded liquid-filled parallel-channel networksSep 07 2014Deformation due to embedded fluidic networks is currently studied in the context of soft-actuators and soft-robotics. Expanding on this concept, beams can be designed so that the pressure in the channel-network is created directly from external forces ... More
A Note on the Consistency Condition of Primordial FluctuationsMar 30 2012We show that the squeezed limit of (N+1)-point functions of primordial correlation functions in which one of the modes has a very small wavenumber can be inferred from the spatial variation of locally measured N-point function. We then show how in single ... More
Best Practices in Convolutional Networks for Forward-Looking Sonar Image RecognitionSep 08 2017Convolutional Neural Networks (CNN) have revolutionized perception for color images, and their application to sonar images has also obtained good results. But in general CNNs are difficult to train without a large dataset, need manual tuning of a considerable ... More
Improving Sonar Image Patch Matching via Deep LearningSep 07 2017Matching sonar images with high accuracy has been a problem for a long time, as sonar images are inherently hard to model due to reflections, noise and viewpoint dependence. Autonomous Underwater Vehicles require good sonar image matching capabilities ... More