Results for "Guy Ben-Yosef"

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Complex Relations in a Deep Structured Prediction Model for Fine Image SegmentationMay 24 2018Many deep learning architectures for semantic segmentation involve a Fully Convolutional Neural Network (FCN) followed by a Conditional Random Field (CRF) to carry out inference over an image. These models typically involve unary potentials based on local ... More
Minimal Images in Deep Neural Networks: Fragile Object Recognition in Natural ImagesFeb 08 2019The human ability to recognize objects is impaired when the object is not shown in full. "Minimal images" are the smallest regions of an image that remain recognizable for humans. Ullman et al. 2016 show that a slight modification of the location and ... More
Kac-Moody Lie algebras graded by Kac-Moody root systemsJul 20 2012We look to gradations of Kac-Moody Lie algebras by Kac-Moody root systems with finite dimensional weight spaces. We extend, to general Kac-Moody Lie algebras, the notion of C-admissible pair as introduced by H. Rubenthaler and J. Nervi for semi-simple ... More
Spline functions, the discrete biharmonic operator and approximate eigenvaluesFeb 27 2017Nov 30 2017The biharmonic operator plays a central role in a wide array of physical models, notably in elasticity theory and the streamfunction formulation of the Navier-Stokes equations. The need for corresponding numerical simulations has led, in recent years, ... More
A model for interpreting social interactions in local image regionsDec 26 2017Understanding social interactions (such as 'hug' or 'fight') is a basic and important capacity of the human visual system, but a challenging and still open problem for modeling. In this work we study visual recognition of social interactions, based on ... More
Structured learning and detailed interpretation of minimal object imagesNov 29 2017We model the process of human full interpretation of object images, namely the ability to identify and localize all semantic features and parts that are recognized by human observers. The task is approached by dividing the interpretation of the complete ... More
Supplementary Material for "Should we sample a time series more frequently? Decision support via multirate spectrum estimation (with discussion)"Apr 22 2016This technical report includes an assortment of technical details and extended discussions related to paper "Should we sample a time series more frequently? Decision support via multirate spectrum estimation (with discussion)", which introduces a model ... More
Metrology of Complex Refractive Index for Solids in the Terahertz Regime Using Frequency Domain SpectroscopyMay 09 2018Sep 20 2018Frequency domain spectroscopy allows an experimenter to establish optical properties of solids in a wide frequency band including the technically challenging 10 THz region, and in other bands enables metrological comparison between competing techniques. ... More
Multiversion Concurrency with Bounded Delay and Precise Garbage CollectionMar 23 2018May 15 2019In this paper we are interested in bounding the number of instructions taken to process transactions. The main result is a multiversion transactional system that supports constant delay (extra instructions beyond running in isolation) for all read-only ... More
A Deterministic Distributed $2$-Approximation for Weighted Vertex Cover in $O(\log n\logΔ/ \log^2\logΔ)$ RoundsApr 04 2018May 23 2018We present a deterministic distributed $2$-approximation algorithm for the Minimum Weight Vertex Cover problem in the CONGEST model whose round complexity is $O(\log n \log \Delta / \log^2 \log \Delta)$. This improves over the currently best known deterministic ... More
Anomalous energy transport in laminates with exceptional pointsJul 20 2019Recent interest in metamaterials has led to a renewed study of wave mechanics in different branches of physics. Elastodynamics involves a special intricacy, owing to a coupling between the volumetric and shear parts of the elastic waves. Through a study ... More
Testing the Wyart-Cates model for non-Brownian shear thickening using bidisperse suspensionsJan 07 2019There is a growing consensus that shear thickening of concentrated dispersions is driven by the formation of stress-induced frictional contacts. The Wyart-Cates (WC) model of this phenomenon, in which the microphysics of the contacts enters solely via ... More
Quark-Squark Alignment RevisitedJun 06 2002We re-examine the possibility that the solution to the supersymmetric flavor problem is related to small mixing angles in gaugino couplings induced by approximate horizontal Abelian symmetries. We prove that, for a large class of models, there is a single ... More
First-Order Indicators for the Estimation of Discrete Fractures in Porous MediaFeb 26 2016Oct 21 2016Faults and geological barriers can drastically affect the flow patterns in porous media. Such fractures can be modeled as interfaces that interact with the surrounding matrix. We propose a new technique for the estimation of the location and hydrogeological ... More
Unsteady flow and particle migration in dense, non-Brownian suspensionsNov 25 2015May 18 2016We present experimental results on dense corn-starch suspensions as examples of non-Brownian, nearly-hard particles that undergo continuous and discontinuous shear thickening (CST and DST) at intermediate and high densities respectively. Our results offer ... More
The Higgs program and open questions in particle physics and cosmologyMay 01 2019The Higgs program is relevant to many of the open fundamental questions in particle physics and in cosmology. Thus, when discussing future collider experiments, one way of comparing them is by assessing their potential contributions to progress on these ... More
A fully pressure-velocity coupled immersed boundary method based on the Lagrange multiplier approachDec 16 2015A new formulation of the immersed boundary method, which facilitates accurate simulation of incompressible isothermal and natural convection flows around immersed bodies and which may be applied for accurate linear stability analysis of the flows, is ... More
Neutrino Masses and Mixing with Non-Anomalous Abelian Flavor SymmetriesFeb 10 1999Feb 16 1999The experimental data on atmospheric and solar neutrinos are used to test the framework of non-anomalous Abelian horizontal gauge symmetries with only three light active neutrinos. We assume that the hierarchy in mass-squared splittings is not accidental ... More
Signal Acquisition from Measurements via Non-Linear ModelsOct 29 2008We consider the problem of reconstruction of a non-linear finite-parametric model $M=M_p(x),$ with $p=(p_1,...,p_r)$ a set of parameters, from a set of measurements $\mu_j(M)$. In this paper $\mu_j(M)$ are always the moments $m_j(M)=\int x^jM_p(x)dx$. ... More
Multivariate normal approximations by Stein's method and size bias couplingsOct 27 2005Stein's method is used to obtain two theorems on multivariate normal approximation. Our main theorem, Theorem 1.2, provides a bound on the distance to normality for any nonnegative random vector. Theorem 1.2 requires multivariate size bias coupling, which ... More
The Importance of Being Majorana: Neutrinos versus Charged Fermions in Flavor ModelsApr 14 2004We argue that neutrino flavor parameters may exhibit features that are very different from those of quarks and charged leptons. Specifically, within the Froggatt-Nielsen (FN) framework, charged fermion parameters depend on the ratio between two scales, ... More
Reconstruction of manifolds and subsets of normed spaces from subgroups of their homeomorphism groupsOct 06 2005We prove various reconstruction theorems about open subsets of normed spaces. E.g. if the uniformly continuous homeomorphism groups of two such sets are isomorphic, then this isomorphism is induced by a uniformly continuous homeomorphism between these ... More
Geometry and Singularities of the Prony mappingJan 07 2013Prony mapping provides the global solution of the Prony system of equations \[ \Sigma_{i=1}^{n}A_{i}x_{i}^{k}=m_{k},\ k=0,1,...,2n-1. \] This system appears in numerous theoretical and applied problems arising in Signal Reconstruction. The simplest example ... More
On the accuracy of solving confluent Prony systemsJun 06 2011Jun 26 2012In this paper we consider several nonlinear systems of algebraic equations which can be called "Prony-type". These systems arise in various reconstruction problems in several branches of theoretical and applied mathematics, such as frequency estimation ... More
On algebraic properties of low rank approximations of Prony systemsMar 25 2018We consider the reconstruction of spike train signals of the form $$F(x) = \sum_{i=1}^d a_i \delta(x-x_i),$$ from their moments measurements $m_k(F)=\int x^k F(x) dx = \sum_{i=1}^d a_ix^k$. When some of the nodes $x_i$ near collide the inversion becomes ... More
Hydrodynamic and contact contributions to shear thickening in colloidal suspensionsSep 09 2015Shear thickening is a widespread phenomenon in suspension flow that, despite sustained study, is still the subject of much debate. The longstanding view that shear thickening is due to hydrodynamic clusters has been challenged by recent theory and simulations ... More
Implicit Decomposition for Write-Efficient Connectivity AlgorithmsOct 07 2017The future of main memory appears to lie in the direction of new technologies that provide strong capacity-to-performance ratios, but have write operations that are much more expensive than reads in terms of latency, bandwidth, and energy. Motivated by ... More
SU(3) Relations and the CP Asymmetry in $B \to K_S K_S K_S$May 23 2005The CP asymmetry in the $B \to K_S K_S K_S$ decay is being measured by the two B factories. A large deviation of the CP asymmetry $S_{K_S K_S K_S}$ from $-S_{\psi K_S}$ and/or of $C_{K_S K_S K_S}$ from zero would imply new physics in $b \to s$ transitions. ... More
Where angular momentum goes in a precessing black hole binaryJul 23 2013Jan 12 2014We evolve a set of 32 equal-mass black-hole binaries with collinear spins (with intrinsic spin magnitudes $|\vec{S}_{1,2}/m^2_{1,2}|=0.8$) to study the effects of precession in the highly nonlinear plunge and merger regimes. We compare the direction of ... More
Nonlinear Gravitational Recoil from the Mergers of Precessing Black-Hole BinariesNov 29 2012Jan 12 2014We present results from an extensive study of 88 precessing, equal-mass black-hole binaries with large spins (83 with intrinsic spins of 0.8 and 5 with intrinsic spins of 0.9)and use these data to model new nonlinear contributions to the gravitational ... More
Foundations of multiple black hole evolutionsNov 08 2007Mar 03 2008We present techniques for long-term, stable, and accurate evolutions of multiple-black-hole spacetimes using the `moving puncture' approach with fourth- and eighth-order finite difference stencils. We use these techniques to explore configurations of ... More
Modeling maximum astrophysical gravitational recoil velocitiesNov 02 2010We measure the recoil velocity as a function of spin for equal-mass, highly-spinning black-hole binaries, with spins in the orbital plane, equal in magnitude and opposite in direction. We confirm that the leading-order effect is linear in the spin and ... More
Gaussian Mixture Generative Adversarial Networks for Diverse Datasets, and the Unsupervised Clustering of ImagesAug 30 2018Generative Adversarial Networks (GANs) have been shown to produce realistically looking synthetic images with remarkable success, yet their performance seems less impressive when the training set is highly diverse. In order to provide a better fit to ... More
Implications of Horizontal Symmetries on Baryon Number Violation in Supersymmetric ModelsAug 18 1994The smallness of the quark and lepton parameters and the hierarchy between them could be the result of selection rules due to a horizontal symmetry broken by a small parameter. The same selection rules apply to baryon number violating terms. Consequently, ... More
Constraining the Phase of B_s - \bar{B}_s MixingMay 02 2006Jul 27 2006New physics contributions to B_s-\bar{B}_s mixing can be parametrized by the size (r_s^2) and the phase (2\theta_s) of the total mixing amplitude relative to the Standard Model amplitude. The phase has so far been unconstrained. We first use the D0 measurement ... More
Relating leptogenesis parameters to light neutrino massesFeb 15 2007We obtain model independent relations among neutrino masses and leptogenesis parameters. We find exact relations that involve the CP asymmetries $\epsilon_{N_\alpha}$, the washout parameters $\tilde m_\alpha$ and $\theta_{\alpha\beta}$, and the neutrino ... More
Le groupoïde de Galois de $P\_1$ et son irréductibilitéOct 30 2005Mar 27 2006In this article, the Galois groupoid of the first Painlev\'{e} equation is computed. This computation use E. Cartan's classification of structural equations of pseudogroups acting on $C^2$ and the degeneration of the first Painlev\'{e} equation on an ... More
Masures affinesOct 23 2008We give an abstract definition of affine hovels which generalizes the definition of affine buildings (eventually non simplicial) given by Jacques Tits and includes the hovels built by Stephane Gaussent and the author for some Kac-Moody groups over ultrametric ... More
The perimeter of uniform and geometric words: a probabilistic analysisAug 21 2017May 12 2018Let a word be a sequence of $n$ i.i.d. integer random variables. The perimeter $P$ of the word is the number of edges of the word, seen as a polyomino. In this paper, we present a probabilistic approach to the computation of the moments of $P$. This is ... More
Holomorphic Cliffordian ProductFeb 04 2005Let R\_{0,n} be the Clifford algebra of the antieuclidean vector space of dimension n. The aim is to built a function theory analogous to the one in the C case. In the latter case, the product of two holomorphic functions is holomorphic, this fact is, ... More
Exceptional symmetric domainsJan 27 2008Feb 23 2008We give the presentation of exceptional bounded symmetric domains using the Albert algebra and exceptional Jordan triple systems. The first chapter is devoted to Cayley-Graves algebras, the second to exceptional Jordan triple systems. In the third chapter, ... More
A New Stability Result for Viscosity Solutions of Nonlinear Parabolic Equations with Weak Convergence in TimeJan 06 2006We present a new stability result for viscosity solutions of fully nonlinear parabolic equations which allows to pass to the limit when one has only weak convergence in time of the nonlinearities.
Non-Standard Analysis, Multiplication of Schwartz Distributions and Delta-Like Solution of Hopf's EquationSep 25 2008Oct 10 2008We construct an algebra of generalized functions $^*\mathcal{E}(\mathbb{R}^d)$. We also construct an embedding of the space of Schwartz distributions $\mathcal{D}^\prime(\mathbb{R}^d)$ into $^*\mathcal{E}(\mathbb{R}^d)$ and thus present a solution of ... More
Lower Bounds for the Size of Random Maximal H-Free GraphsMay 12 2008Dec 19 2009We consider the next greedy randomized process for generating maximal H-free graphs: Given a fixed graph H and an integer n, start by taking a uniformly random permutation of the edges of the complete n-vertex graph. Then, construct an n-vertex graph, ... More
Local regularity properties of almost- and quasiminimal sets with a sliding boundary conditionJan 06 2014We study the boundary regularity of almost minimal and quasiminimal sets that satisfy sliding boundary conditions. The competitors of a set $E$ are defined as $F = \varphi_1(E)$, where $\{ \varphi_t \}$ is a one parameter family of continuous mappings ... More
Some Homogenization Results for Non-Coercive Hamilton-Jacobi EquationsMay 23 2006Dec 22 2006Recently, C. Imbert & R. Monneau study the homogenization of coercive Hamilton-Jacobi Equations with a $u/e$-dependence : this unusual dependence leads to a non-standard cell problem and, in order to solve it, they introduce new ideas to obtain the estimates ... More
Solution to Rubel's question about differentially algebraic dependence on initial valuesOct 31 2002Nov 28 2002We prove that, for generic systems of polynomial differential equations, the dependence of the solution on the initial conditions is not differentially algebraic. This answers, in the negative, a question posed by L.A. Rubel.
H. Bohr's theorem for bounded symmetric domainsDec 28 2008Apr 09 2009A theorem of Harald Bohr (1914) states that if f is a holomorphic map from the unit disc into itself, then the sum of absolute values of its Taylor expansion is less than 1 for |z|<1/3. The bound 1/3 is optimal. This result has been extended in a suitable ... More
Towards Unstructured Mesh Generation Using the Inverse Poisson ProblemFeb 17 2008A novel approach to unstructured quadrilateral mesh generation for planar domains is presented. Away from irregular vertices, the resulting meshes have the properties of nearly conformal grids. The technique is based on a theoretical relation between ... More
Triangle-free Subgraphs at the Triangle-Free ProcessMar 10 2009Jul 06 2009We consider the triangle-free process: given an integer n, start by taking a uniformly random ordering of the edges of the complete n-vertex graph K_n. Then, traverse the ordered edges and add each traversed edge to an (initially empty) evolving graph ... More
Nonparametric Online Learning Using Lipschitz Regularized Deep Neural NetworksMay 26 2019Deep neural networks are considered to be state of the art models in many offline machine learning tasks. However, their performance and generalization abilities in online learning tasks are much less understood. Therefore, we focus on online learning ... More
Higher Bers mapsDec 01 2008The Bers embebbing realizes the Teichm\"uller space of a Fuchsian group $G$ as a open, bounded and contractible subset of the complex Banach space of bounded quadratic differentials for $G$. It utilizes the schlicht model of Teichm\"uller space, where ... More
Simulation Study Comparing Two Tests of Second-order Stationarity and Confidence Intervals for Localized AutocovarianceMar 21 2016This report compares two tests of second-order stationarity through simulation. It also provides several examples of localised autocovariances and their approximate confidence intervals on different real and simulated data sets. An empirical verification ... More
Mass Matrix Models: The SequelOct 20 1993The smallness of the quark sector parameters and the hierarchy between them could be the result of a horizontal symmetry broken by a small parameter. Such an explicitly broken symmetry can arise from an exact symmetry which is spontaneously broken. Constraints ... More
Neutrinoless double-beta decay with massive scalar emissionFeb 22 2018Aug 16 2018Searches for neutrino-less double-beta decay ($0\nu2\beta$) place an important constraint on models where light fields beyond the Standard Model participate in the neutrino mass mechanism. While $0\nu2\beta$ experimental collaborations often consider ... More
Large BR(h->tau mu) in the MSSM?Nov 03 2015Jul 12 2016We study how large the rate of the lepton-flavor violating Higgs decay h->tau mu can be in the (R-parity conserving) MSSM. We make no assumptions, such as universality or alignment, about the flavor structure of the MSSM. We only assume that all couplings ... More
Algebraic reconstruction of piecewise-smooth functions from integral measurementsMar 21 2011This paper presents some results on a well-known problem in Algebraic Signal Sampling and in other areas of applied mathematics: reconstruction of piecewise-smooth functions from their integral measurements (like moments, Fourier coefficients, Radon transform, ... More
Geometry of error amplification in solving Prony system with near-colliding nodesJan 15 2017May 13 2019We consider a reconstruction problem for ``spike-train'' signals $F$ of an a priori known form $ F(x)=\sum_{j=1}^{d}a_{j}\delta\left(x-x_{j}\right),$ from their moments $m_k(F)=\int x^kF(x)dx.$ We assume that the moments $m_k(F)$, $k=0,1,\ldots,2d-1$, ... More
Super-resolution of near-colliding point sourcesApr 19 2019We consider the problem of stable recovery of sparse signals of the form $$F(x)=\sum_{j=1}^d a_j\delta(x-x_j),\quad x_j\in\mathbb{R},\;a_j\in\mathbb{C}, $$ from their spectral measurements, known in a bandwidth $\Omega$ with absolute error not exceeding ... More
Neutrino Parameters, Abelian Flavor Symmetries, and Charged Lepton Flavor ViolationNov 16 1999Feb 07 2000Neutrino masses and mixings have important implications for models of fermion masses, and, most directly, for the charged lepton sector. We consider supersymmetric Abelian flavor models, where neutrino mass parameters are related to those of charged leptons ... More
Product Groups, Discrete Symmetries, and Grand UnificationJun 26 2002We study grand unified theories based on an SU(5)xSU(5) gauge group in which the GUT scale, M_{GUT}, is the VEV of an exact or approximate modulus, and in which fast proton decay is avoided through a combination of a large triplet mass and small triplet ... More
Decoupling of Fourier Reconstruction System for Shifts of Several SignalsMay 13 2013We consider the problem of ``algebraic reconstruction'' of linear combinations of shifts of several signals $f_1,\ldots,f_k$ from the Fourier samples. For each $r=1,\ldots,k$ we choose sampling set $S_r$ to be a subset of the common set of zeroes of the ... More
Are adaptive allocation designs beneficial for improving power in binary response trials?Feb 24 2011Mar 20 2011We consider the classical problem of selecting the best of two treatments in clinical trials with binary response. The target is to find the design that maximizes the power of the relevant test. Many papers use a normal approximation to the power function ... More
Prony Scenarios and Error Amplification in a Noisy Spike-Train ReconstructionFeb 25 2018Mar 08 2018The paper is devoted to the characterization of the geometry of Prony curves arising from spike-train signals. We give a sufficient condition which guarantees the blowing up of the amplitudes of a Prony curve S in case where some of its nodes tend to ... More
Geometry and Singularities of Prony varietiesJun 05 2018We start a systematic study of the topology, geometry and singularities of the Prony varieties $S_q(\mu)$, defined by the first $q+1$ equations of the classical Prony system $$\sum_{j=1}^d a_j x_j^k = \mu_k, \ k= 0,1,\ldots \ .$$ Prony varieties, being ... More
Accuracy of noisy Spike-Train Reconstruction: a Singularity Theory point of viewJan 07 2018Apr 22 2018This is a survey paper discussing one specific (and classical) system of algebraic equations - the so called "Prony system". We provide a short overview of its unusually wide connections with many different fields of Mathematics, stressing the role of ... More
Reconstruction of Planar Domains from Partial Integral MeasurementsMay 25 2012We consider the problem of reconstruction of planar domains from their moments. Specifically, we consider domains with boundary which can be represented by a union of a finite number of pieces whose graphs are solutions of a linear differential equation ... More
Large Mixing and Large Hierarchy Between Neutrinos with Abelian Flavor SymmetriesAug 18 1998Sep 01 1998The experimental data on atmospheric and solar neutrinos suggest that there is near-maximal mixing between \nu_\mu and \nu_\tau but that their masses are hierarchically separated. In models of Abelian horizontal symmetries, mixing of O(1) generically ... More
New Approaches in designing a Zeeman-SlowerDec 10 2012Jan 17 2013We present two new approaches for the design of a Zeeman-Slower, which rely on optimal compliance with the adiabatic following condition and are applicable to a wide variety of systems. The first approach is an analytical one, based on the assumption ... More
The Pattern of CP Asymmetries in $b\to s$ TransitionsMar 16 2005Oct 06 2005New CP violating physics in $b\to s$ transitions will modify the CP asymmetries in B decays into final CP eigenstates ($\phi K_S$, $\eta^\prime K_S$, $\pi^0 K_S$, $\omega K_S$, $\rho^0 K_S$ and $\eta K_S$) from their Standard Model values. In a model ... More
The importance of N2 leptogenesisDec 15 2006Sep 17 2007We argue that fast interactions of the lightest singlet neutrino $N_1$ would project part of a preexisting lepton asymmetry $L_p$ onto a direction that is protected from $N_1$ washout effects, thus preventing it from being erased. In particular, we consider ... More
Time Variations in the Scale of Grand UnificationSep 12 2002Oct 08 2002We study the consequences of time variations in the scale of grand unification, $M_U$, when the Planck scale and the value of the unified coupling at the Planck scale are held fixed. We show that the relation between the variations of the low energy gauge ... More
2D-3D crossover in a dense electron liquid in siliconFeb 14 2018Feb 15 2018Doping of silicon via phosphene exposures alternating with molecular beam epitaxy overgrowth is a path to Si:P substrates for conventional microelectronics and quantum information technologies. The technique also provides a new and well-controlled material ... More
Gravitational wave extraction based on Cauchy-characteristic extraction and characteristic evolutionJan 04 2005Sep 27 2005We implement a code to find the gravitational news at future null infinity by using data from a Cauchy code as boundary data for a characteristic code. This technique of Cauchy-characteristic Extraction (CCE) allows for the unambiguous extraction of gravitational ... More
Molecular dynamics simulations of palladium cluster growth on flat and rough graphite surfacesSep 07 2006Parallel Molecular Dynamics simulations are conducted for describing growth on surfaces with different kind of roughness: a perfect ordered crystalline flat graphite surface, a disordered rough graphite surface and flat surface with an ordered localized ... More
A Tight Bound for Hypergraph Regularity IApr 16 2018Jul 18 2019The hypergraph regularity lemma -- the extension of Szemer\'edi's graph regularity lemma to the setting of $k$-uniform hypergraphs -- is one of the most celebrated combinatorial results obtained in the past decade. By now there are several (very different) ... More
A Tight Bound for Hypergraph Regularity IIApr 16 2018The hypergraph regularity lemma -- the extension of Szemer\'edi's graph regularity lemma to the setting of $k$-uniform hypergraphs -- is one of the most celebrated combinatorial results obtained in the past decade. By now there are several (very different) ... More
Exact Bounds for Some Hypergraph Saturation ProblemsSep 17 2012Jan 21 2014Let W_n(p,q) denote the minimum number of edges in an n x n bipartite graph G on vertex sets X,Y that satisfies the following condition; one can add the edges between X and Y that do not belong to G one after the other so that whenever a new edge is added, ... More
A Tight Bound for Hyperaph RegularityJul 17 2019The hypergraph regularity lemma -- the extension of Szemer\'edi's graph regularity lemma to the setting of $k$-uniform hypergraphs -- is one of the most celebrated combinatorial results obtained in the past decade. By now there are several (very different) ... More
A Markovian Analysis of IEEE 802.11 Broadcast Transmission Networks with BufferingJun 19 2015The purpose of this paper is to analyze the so-called back-off technique of the IEEE 802.11 protocol in broadcast mode with waiting queues. In contrast to existing models, packets arriving when a station (or node) is in back-off state are not discarded, ... More
Kac-Moody groups, hovels and Littelmann's pathsMar 21 2007Nov 14 2008We give the definition of a kind of building I for a symmetrizable Kac-Moody group over a field K endowed with a dicrete valuation and with a residue field containing C. Due to some bad properties, we call this I a hovel. Nevertheless I has some good ... More
Heavy Quark Expansion for the Inclusive Decay $\bar B\toτ\,\barν\,X$Jan 10 1994We calculate the differential decay rate for inclusive $\bar B\to\tau\,\bar\nu\,X$ transitions to order $1/m_b^2$ in the heavy quark expansion, for both polarized and unpolarized tau leptons. We show that using a systematic $1/m_b$ expansion significantly ... More
Strong phases and D0-anti-D0 mixing parametersNov 15 1999Dec 20 1999We argue that there could be large, SU(3) violating resonance contributions to D -> K pi decays which would affect the extraction of the D0-anti-D0 mixing parameters from experiment. Such contributions can induce a large strong phase in the interference ... More
On Higgs and sphaleron effects during the leptogenesis eraDec 04 2005Dec 22 2005We discuss the effects of various processes that can be active during the leptogenesis era, and present the Boltzmann equations that take them into account appropriately. A non-vanishing Higgs number asymmetry is always present, enhancing the washout ... More
Gravitational Recoil From Accretion-Aligned Black-Hole BinariesJan 09 2012Mar 19 2012We explore the newly discovered "hangup-kick" effect, which greatly amplifies the recoil for configuration with partial spin- orbital-angular momentum alignment, by studying a set of 48 new simulations of equal-mass, spinning black-hole binaries. We propose ... More
CP Violation and the Scale of Supersymmetry BreakingJan 10 2001Supersymmetric models with a high supersymmetry breaking scale give, in general, large contributions to epsilon_K and/or to various electric dipole moments, even when contributions to CP conserving, flavor changing processes are sufficiently suppressed. ... More
The Mg-sigma Relation and the Genesis of Early-Type GalaxiesJun 24 2002Available data on the magnesium - velocity dispersion (Mg-sigma) relation for \~2000 early-type galaxies is collected and compared. As noted previously, the Mg residuals from a fitted line are roughly Gaussian near the mean but have an asymmetric blue ... More
A duality theory for non-convex problems in the Calculus of VariationsJul 11 2016We present a new duality theory for non-convex variational problems, under possibly mixed Dirichlet and Neumann boundary conditions. The dual problem reads nicely as a linear programming problem, and our main result states that there is no duality gap. ... More
Traffic Light Queues and the Poisson Clumping HeuristicOct 29 2018Jan 21 2019In discrete time, $\ell$-blocks of red lights are separated by $\ell$-blocks of green lights. Cars arrive at random. We seek the distribution of maximum line length of idle cars, and justify conjectured probabilistic asymptotics for $2 \leq \ell \leq ... More
Some exact asymptotics in the counting of walks in the quarter-planeJan 19 2012Jan 12 2013Enumeration of planar lattice walks is a classical topic in combinatorics, at the cross-roads of several domains (e.g., probability, statistical physics, computer science). The aim of this paper is to propose a new approach to obtain some exact asymptotics ... More
Leveraging sentence similarity in natural language generation: Improving beam search using range votingAug 17 2019We propose a novel method for generating natural language sentences from probabilistic language models, selecting from a beam search using a range voting procedure. The proposed method could be applied to any language model, including both n-gram models ... More
Significant Impact of Rossby Waves on Air Pollution Detected by Network AnalysisMar 06 2019Air pollution is associated with human diseases and has been found to be related to premature mortality. In response, environmental policies have been adopted in many countries, to decrease anthropogenic air pollution for the improvement of long-term ... More
Forecasting the magnitude and onset of El Nino based on climate networkMar 27 2017Apr 13 2018El Nino is probably the most influential climate phenomenon on interannual time scales. It affects the global climate system and is associated with natural disasters and serious consequences in many aspects of human life. However, the forecasting of the ... More
Conditioning of partial nonuniform Fourier matrices with clustered nodesSep 03 2018Jun 19 2019We prove sharp lower bounds for the smallest singular value of a partial Fourier matrix with arbitrary "off the grid" nodes (equivalently, a rectangular Vandermonde matrix with the nodes on the unit circle), in the case when some of the nodes are separated ... More
The importance of flavor in leptogenesisJan 11 2006Jan 18 2006We study leptogenesis from the out-of-equilibrium decays of the lightest heavy neutrino $N_1$ in the medium (low) temperature regime, $T\lsim 10^{12}$ GeV ($10^{10}$ GeV), where the rates of processes mediated by the $\tau$ (and $\mu$) Yukawa coupling ... More
Leptogenesis from Supersymmetry BreakingJul 07 2003Aug 17 2003We show that soft supersymmetry breaking terms involving the heavy sneutrinos can lead to sneutrino-antisneutrino mixing and to new sources of CP violation, which are present even if a single generation is considered. These terms are naturally present ... More
Oceanic El-Niño wave dynamics and climate networksMay 27 2015Oceanic Kelvin and Rossby waves play an important role in tropical climate and \en dynamics. Here we develop and apply a climate network approach to quantify the characteristics of \en related oceanic waves, based on sea surface height satellite data. ... More
Comment on extracting alpha from B -> rho rhoOct 21 2003Dec 02 2003Recent experimental results on $B\to\rho\rho$ decays indicate that the CP asymmetry $S_{\rho^+\rho^-}$ will give an interesting determination of $\alpha=\arg[-(V_{td}V_{tb}^*)/(V_{ud}V_{ub}^*)]$. In the limit when the $\rho$ width is neglected, the $B\to\pi\pi$ ... More
Percolation framework to describe El Niño conditionsNov 18 2016Complex networks have been used intensively to investigate the flow and dynamics of many natural systems including the climate system. Here, we develop a percolation based measure, the order parameter, to study and quantify climate networks. We find that ... More
The Standard Model and Supersymmetric Flavor Puzzles at the Large Hadron ColliderDec 05 2007Can the Large Hadron Collider explain the masses and mixings of the known fermions? A promising possibility is that these masses and mixings are determined by flavor symmetries that also govern new particles that will appear at the LHC. We consider well-motivated ... More