Results for "Krishna Pillutla"

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A Smoother Way to Train Structured Prediction ModelsFeb 08 2019We present a framework to train a structured prediction model by performing smoothing on the inference algorithm it builds upon. Smoothing overcomes the non-smoothness inherent to the maximum margin structured prediction objective, and paves the way for ... More
Data Driven Resource Allocation for Distributed LearningDec 15 2015Dec 15 2016In distributed machine learning, data is dispatched to multiple machines for processing. Motivated by the fact that similar data points often belong to the same or similar classes, and more generally, classification rules of high accuracy tend to be "locally ... More
Data Driven Resource Allocation for Distributed LearningDec 15 2015In distributed machine learning, data is dispatched to multiple machines for processing. Motivated by the fact that similar data points are often belonging to the same or similar classes, and more generally, classification rules of high accuracy tend ... More
Seshadri constants on surfaces with Picard number 1Aug 16 2016Let $X$ be a smooth projective surface with Picard number 1. Let $L$ be the ample generator of the N\'eron-Severi group of $X$. Given an integer $r\ge 2$, we prove lower bounds for the Seshadri constant of $L$ at $r$ general points in $X$.
The Phases of QCD in Heavy Ion Collisions and Compact StarsSep 05 2000Sep 14 2000I review arguments for the existence of a critical point in the QCD phase diagram as a function of temperature and baryon chemical potential. I describe how heavy ion collision experiments at the SPS and RHIC can discover the tell-tale signatures of such ... More
Traversing the QCD Phase Transition: Quenching Out of Equilibrium vs. Slowing Out of Equilibrium vs. Bubbling Out of EquilibriumMay 11 2000May 15 2000I review arguments for the existence of a critical point E in the QCD phase diagram as a function of temperature T and baryon chemical potential \mu. I describe how heavy ion collision experiments at the SPS and RHIC can discover the tell-tale signatures ... More
Crystalline Color SuperconductivitySep 14 2001We give an introduction crystalline color superconductivity, arguing that it is likely to occur wherever quark matter in which color-flavor locking does not occur is found. We survey the properties of this form of quark matter, and argue that its presence ... More
Collision Induced Decays of Electroweak Solitons: Fermion Number Violation with Two Initial ParticlesAug 23 1996This paper presents work done in collaboration with E. Farhi, J. Goldstone, and A. Lue which is described in full in Ref. [1]. We consider a variant of the standard electroweak theory in which the Higgs sector has been modified so that there is a classically ... More
Emergence of long wavelength pion oscillations following a rapid QCD phase transitionAug 28 1993To model the dynamics of the chiral order parameter in a far from equilibrium QCD phase transition, we consider quenching in the O(4) linear sigma model. We summarize arguments and numerical evidence which show that in the period immediately following ... More
Riemann-Roch For Equivariant K-TheoryJun 09 2009The goal of this paper is to prove the Riemann-Roch isomorphism for the higher equivariant K-theory of varieties with action of a linear algebraic group.
On K_2 of 1-dimensional local ringsFeb 12 2004We study K_2 of one-dimensional local domains over a field of characteristic 0, introduce a conjecture, and show that this conjecture implies Geller's conjecture. We also show that Berger's conjecture implies Geller's conjecture, and hence verify it in ... More
Cobordism of flag bundlesJul 07 2010Let $G$ be a connected linear algebraic group over a field $k$ of characteristic zero. For a principal $G$-bundle $\pi: E \to X$ over a scheme $X$ of finite type over $k$ and a parabolic subgroup $P$ of $G$, we describe the rational algebraic cobordism ... More
Positivity of line bundles on general blow ups of $\mathbb{P}^2$Jul 23 2015Oct 19 2016Let $X$ be the blow up of $\mathbb{P}^2$ at $r$ general points $p_1,\ldots,p_r \in \mathbb{P}^2$. We study line bundles on $X$ given by plane curves of degree $d$ passing through $p_i$ with multiplicity $m_i$. We establish conditions for ampleness, very ... More
Some Koszul Rings from GeometryMay 23 2009Jun 23 2009We give examples of Koszul rings that arise naturally in algebraic geometry. In the first part, we prove a general result on Koszul property associated to an ample line bundle on a projective variety. Specifically, we show how Koszul property of multiples ... More
How to Find the QCD Critical PointMar 31 1999The event-by-event fluctuations in heavy ion collisions carry information about the thermodynamic properties of the hadronic system at the time of freeze-out. By studying these fluctuations as a function of varying control parameters, such as the collision ... More
QCD at Finite Baryon Density: Chiral Symmetry Restoration and Color SuperconductivityMar 13 1998We use a variational procedure to study finite density QCD in an approximation in which the interaction between quarks is modelled by that induced by instantons. We find that uniform states with conventional chiral symmetry breaking have negative pressure ... More
On 0-cycles with modulusApr 13 2015Nov 16 2015Given a smooth surface $X$ over a field and an effective Cartier divisor $D$, we provide an exact sequence connecting $CH_0(X,D)$ and the relative $K$-group $K_0(X,D)$. We use this exact sequence to answer a question of Kerz and Saito whenever $X$ is ... More
Equivariant Cobordism for Torus ActionsOct 29 2010We study the equivariant cobordism theory of schemes for torus actions. We give the explicit relation between the equivariant and the ordinary cobordism of schemes with torus action. We deduce analogous results for action of arbitrary connected linear ... More
Completions of Higher Equivariant K-theoryJun 15 2009The goal of this paper is to prove a version of the non-abelian localization theorem for the rational equivariant K-theory of a smooth variety $X$ with the action of a linear algebraic group $G$. We then use this to prove a Riemann-Roch theorem which ... More
On torsion in the 0-cycle group with modulusJul 06 2016We show for a smooth projective variety $X$ over an algebraically closed field $k$ with an effective Cartier divisor $D$ that the torsion subgroup $\CH_0(X|D)\{l\}$ can be described in terms of a relative {\'e}tale cohomology for any prime $l \neq p = ... More
0-cycles on singular schemes and class field theoryFeb 05 2015We show that the Chow group of 0-cycles on a singular projective scheme $X$ over a finite field describes the abelian extensions of its function field which are unramified over the regular locus of $X$. As a consequence, we obtain the Bloch-Quillen formula ... More
Equivariant cobordism of schemesJun 16 2010Oct 25 2010We study the equivariant cobordism theory of schemes for action of linear algebraic groups. We compare the equivariant cobordism theory for the action of a linear algebraic groups with similar groups for the action of tori and deduce some consequences ... More
On The Negative K-Theory of Schemes in Finite CharacteristicNov 03 2008We study the negative $K$-theory of singular varieties over a field of positive characteristic and in particular, prove the vanishing of $K_i(X)$ for $i < -d-2$ for a $k$-variety of dimension $d$.
N= 4 Supersymmetric Quantum Mechanical Model: Novel SymmetriesJun 19 2016We discuss a set of novel discrete symmetry transformations of the N = 4 supersymmetric quantum mechanical model of a charged particle moving on a sphere in the background of Dirac magnetic monopole. The usual five continuous symmetries (and their conserved ... More
A cdh approach to zero-cycles on singular varietiesMar 01 2010We study the Chow group of zero-cycles on singular varieties using the cdh topology. We define the cdh versions of the zero-cycles and albanese maps. We prove results comparing these groups for a singular variety with the similar groups on the resolution ... More
Continuity of integrated density of states -- independent randomnessSep 14 2006Sep 19 2006In this paper we discuss the continuity properties of the integrated density of states for random models based on that of the single site distribution. Our results are valid for models with independent randomness with arbitrary free parts. In particular ... More
Toroidalization of Locally Toroidal Morphisms from N-folds to SurfacesMar 28 2008Jul 14 2008The toroidalization conjecture of D. Abramovich, K. Karu, K. Matsuki, and J. Wlodarczyk asks whether any given morphism of nonsingular varieties over an algebraically closed field of characteristic zero can be modified into a toroidal morphism. Following ... More
Absolutely continuous spectrum and spectral transition for some continuous random operatorsFeb 21 2011In this paper we consider two classes of random Hamiltonians on $L^2(\RR^d)$ one that imitates the lattice case and the other a Schr\"odinger operator with non-decaying, non-sparse potential both of which exhibit a.c. spectrum. In the former case we also ... More
The QCD Tricritical Point: Beyond Monotony in Heavy Ion PhysicsAug 18 1998I first sketch recent developments concerning the phase diagram of strongly interacting matter as a function of temperature and baryon density, obtained using a model for two-flavor QCD in which the interaction between quarks is modelled on that induced ... More
Three-Flavor QCD at High Density: Color Flavor Locking and Chiral Symmetry BreakingJul 09 1998We propose a symmetry breaking scheme for QCD with three massless quarks at high baryon density wherein the color and flavor SU(3)_{color}xSU(3)_{L}xSU(3)_{R} symmetries are broken down to the diagonal subgroup SU(3)_{color+L+R} by the formation of a ... More
Extension of $ν$MSM model and possible explanations of recent astronomical and collider observationsDec 21 2015Here I present the extension to ${\nu}$MSM model by adding a $U(1)'$ gauge symmetry under which right-handed fermions including sterile neutrinos and exotic Higgs scalar are charged. This model explains 3.5 keV line observed by XMM-Newton telescope as ... More
Formation and Destruction of Autocatalytic Sets in an Evolving Network ModelMar 28 2004I analyse a model of an evolving network represented as a directed graph; each node corresponds to one molecular species and the links to catalytic interactions between species. Over short timescales the graph remains fixed while relative populations ... More
Seshadri constants on surfaces with Picard number 1Aug 16 2016Oct 19 2016Let $X$ be a smooth projective surface with Picard number 1. Let $L$ be the ample generator of the N\'eron-Severi group of $X$. Given an integer $r\ge 2$, we prove lower bounds for the Seshadri constant of $L$ at $r$ general points in $X$.
Equivariant K-theory and Higher Chow Groups of Smooth VarietiesJun 17 2009For a quasi-projective variety $X$ over a field, with the action of a split torus, we construct a spectral sequence relating the equivariant and the ordinary higher Chow groups. We then completely describe the equivariant higher Chow groups of smooth ... More
The Chiral Phase Transition in QCD: Critical Phenomena and Long Wavelength Pion OscillationsApr 16 1995May 07 1995In QCD with two massless quarks, the chiral phase transition is plausibly in the same universality class as the classical O(4) magnet. To test this hypothesis, critical exponents characterizing the behaviour of universal quantities near the 2nd order ... More
Mapping the QCD Phase DiagramAug 15 1999I review recent theoretical developments which show how a key qualitative feature of the QCD phase diagram, namely a critical point which in a sense defines the landscape which heavy ion collision experiments are seeking to map, can be discovered. The ... More
Positivity of line bundles on special blow ups of $\mathbb{P}^2$Aug 19 2016Sep 27 2016Let $C \subset \mathbb{P}^2$ be an irreducible and reduced curve of degree $e > 0$. Let $X$ be the blow up of $\mathbb{P}^2$ at $r$ distinct points $p_1,\ldots,p_r \in C$. We study line bundles on $X$ and establish conditions for ampleness and $k$-very ... More
The motivic cobordism for group actionsJun 26 2012For a linear algebraic group $G$ over a field $k$, we define an equivariant version of the Voevodsky's motivic cobordism $MGL$. We show that this is an oriented cohomology theory with localization sequence on the category of smooth $G$-schemes and there ... More
Inner cohomology of $GL_n$Feb 20 2018Feb 22 2018We give an explicit description of the inner cohomology of an adelic locally symmetric space of a given level structure attached to the general linear group of prime rank $n$, with coefficients in a locally constant sheaf of complex vector spaces. We ... More
Positivity of line bundles on general blow ups of $\mathbb{P}^2$Jul 23 2015Nov 19 2015Let $X$ be the blow up of $\mathbb{P}^2$ at $r$ general points $p_1,\ldots,p_r \in \mathbb{P}^2$. We study line bundles on $X$ given by plane curves of degree $d$ passing through $p_i$ with multiplicity $m_i$. We establish conditions for ampleness, very ... More
AC spectrum for a class of random operators at small disorderJul 11 2011In this paper we present a class of Anderson type operators with independent, non-stationary (non-decaying) random potentials supported on a subset of positive density in the odd-dimensional lattice and prove the existence of pure absolutely continuous ... More
Perspectives on the mathematics of biological patterning and morphogenesisOct 08 2016A central question in developmental biology is how size and position are determined. The genetic code carries instructions on how to control these properties in order to regulate the pattern and morphology of structures in the developing organism. Transcription ... More
Disorienting the Chiral Condensate at the QCD Phase TransitionMar 06 1997I sketch how long wavelength modes of the pion field can be amplified during the QCD phase transition. If nature had been kinder, and had made the pion mass significantly less than the critical temperature for the transition, then this phenomenon would ... More
Completion theorem for equivariant $K$-theoryJan 27 2012Nov 16 2015In this paper, we study the algebraic analogue of the topological Atiyah-Segal completion theorem. We verify this completion theorem for the algebraic equivariant $K$-theory of smooth projective schemes. We also show that the completion theorem fails ... More
Zero cycles on affine varietiesNov 13 2015We show that the Chow group of 0-cycles of an affine algebra of dimension at least two over an algebraically closed field is torsion-free. As consequences, we affirmatively answer a question of Murthy and derive several other applications.
Gersten Conjecture For Equivariant K-theory And ApplicationsJun 22 2009For a reductive group scheme over a regular semi-local ring, we prove an equivarinat version of the Gersten conjecture. We draw some interesting consequences for the representation rings of such reductive group schemes. We also prove the rigidity for ... More
Equivariant K-theory and Higher Chow Groups of SchemesJun 17 2009Nov 30 2016For a smooth quasi-projective scheme $X$ over a field $k$ with an action of a reductive group, we establish a spectral sequence connecting the equivariant and the ordinary higher Chow groups of $X$. For $X$ smooth and projective, we show that this spectral ... More
An Artin-Rees Theorem and applications to zero cyclesApr 10 2008We prove an Artin-Rees type theorem for algebraic cycles and give an application to zero cycles.
Positivity of line bundles on special blow ups of $\mathbb{P}^2$Aug 19 2016Jan 06 2017Let $C \subset \mathbb{P}^2$ be an irreducible and reduced curve of degree $e > 0$. Let $X$ be the blow up of $\mathbb{P}^2$ at $r$ distinct smooth points $p_1,\ldots,p_r \in C$. We study line bundles on $X$ and establish conditions for ampleness and ... More
The reduced classical car-following model: stability analyses and design guidelinesJul 29 2016Aug 01 2016Reaction delays play an important role in determining the qualitative dynamical properties of a platoon of vehicles driving on a straight road. In this paper, we investigate the impact of delayed feedback on the dynamics of a recently-proposed car-following ... More
Multilevel Coding Schemes for Compute-and-Forward with Flexible DecodingDec 12 2011Dec 14 2011We consider the design of coding schemes for the wireless two-way relaying channel when there is no channel state information at the transmitter. In the spirit of the compute and forward paradigm, we present a multilevel coding scheme that permits computation ... More
Joint Compute and Forward for the Two Way Relay Channel with Spatially Coupled LDPC CodesMay 26 2012We consider the design and analysis of coding schemes for the binary input two way relay channel with erasure noise. We are particularly interested in reliable physical layer network coding in which the relay performs perfect error correction prior to ... More
An MSE Based Ttransfer Chart to Analyze Iterative Decoding SchemesJun 14 2005An alternative to extrinsic information transfer (EXIT) charts called mean squared error (MSE) charts that use a measure related to the MSE instead of mutual information is proposed. Using the relationship between mutual information and minimum mean squared ... More
Multi-point Seshadri constants on ruled surfacesOct 25 2016Let $X$ be a surface and let $L$ be an ample line bundle on $X$. We first obtain a lower bound for the Seshadri constant $\varepsilon(X,L,r)$, when $r \ge 3$. We then assume that $X$ is a ruled surface and study Seshadri constants on $X$ in greater detail. ... More
Mass-Induced Crystalline Color SuperconductivityDec 14 2001Jan 09 2002We demonstrate that crystalline color superconductivity may arise as a result of pairing between massless quarks and quarks with nonzero mass m_s. Previous analyses of this phase of cold dense quark matter have all utilized a chemical potential difference ... More
Szego limit theorem on the latticeFeb 21 2011Jul 13 2012In this paper, we prove a Szeg\"{o} type limit theorem on $\ell^2(\ZZ^d)$. We consider operators of the form $H=\Delta+V$, $V$ multiplication by a positive sequence $\{V(n), n \in \ZZ^d\}$ with $V(n) \rightarrow \infty, |n| \rightarrow \infty $ on $\ell^2(\ZZ^d)$ ... More
Illuminating Dense Quark MatterJul 19 2001We imagine shining light on a lump of cold dense quark matter, in the CFL phase and therefore a transparent insulator. We calculate the angles of reflection and refraction, and the intensity of the reflected and refracted light. Although the only potentially ... More
Stressed pairing in conventional color superconductors is unavoidableDec 02 2005Jan 18 2006At sufficiently high densities, cold dense three-flavor quark matter is in the color-flavor locked (CFL) phase, in which all nine quarks pair in a particularly symmetric fashion. Once the heaviness of the strange quark (mass $m_s$) and the requirements ... More
BKM Lie superalgebra for the Z_5 orbifolded CHL stringNov 09 2010We study the Z_5-orbifolding of the CHL string theory by explicitly constructing the modular form tilde{Phi}_2 generating the degeneracies of the 1/4-BPS states in the theory. Since the additive seed for the sum form is a weak Jacobi form in this case, ... More
Multiple Signal Classification Algorithm (MUSICAL) for super-resolution fluorescence microscopyNov 28 2016Super-resolution microscopy is providing unprecedented insights into biology by resolving details much below the diffraction limit. State-of-the-art Single Molecule Localization Microscopy (SMLM) techniques for super-resolution are restricted by long ... More
Analogues of Gersten's conjecture for singular schemesAug 23 2015Jul 21 2016We formulate analogues, for Noetherian local $\mathbb Q$-algebras which are not necessarily regular, of the injectivity part of Gersten's conjecture in algebraic $K$-theory, and prove them in various cases. Our results suggest that the algebraic $K$-theory ... More
Wavy stripes and squares in zero P number convectionMar 29 2001A simple model to explain numerically observed behaviour of chaotically varying stripes and square patterns in zero Prandtl number convection in Boussinesq fluid is presented. The nonlinear interaction of mutually perpendicular sets of wavy rolls, via ... More
Localization and mobility edge for sparsely random potentialsMay 18 1998Nov 04 1998In this paper we consider sparsely random potentials in 5 or more dimensional cubic lattice and exhibit localized and extended states. We identify also the mobility edge for a class of potentials going to infinity at infinity. Our treatment includes a ... More
From Prediction to Planning: Improving Software Quality with BELLTREEAug 17 2017Jul 20 2018The current generation of software analytics tools are mostly prediction algorithms (e.g. support vector machines, naive bayes, logistic regression, etc). While prediction is useful, after prediction comes planning about what actions to take in order ... More
Bellwethers: A Baseline Method For Transfer LearningMar 17 2017Jan 21 2018Software analytics builds quality prediction models for software projects. Experience shows that (a) the more projects studied, the more varied are the conclusions; and (b) project managers lose faith in the results of software analytics if those results ... More
A unified approach to the integrals of Mellin--Barnes--Hecke typeAug 30 2012In this paper we provide a unified approach to a family of integrals of Mellin--Barnes type using distribution theory and Fourier transforms. Interesting features arise in many of the cases which call for the application of pull-backs of distributions ... More
Enforced Electrical Neutrality of the Color-Flavor Locked PhaseDec 05 2000Aug 22 2008We demonstrate that quark matter in the color-flavor locked phase of QCD is rigorously electrically neutral, despite the unequal quark masses, and even in the presence of an electron chemical potential. As long as the strange quark mass and the electron ... More
Towards automating the generation of derivative nouns in Sanskrit by simulating PaniniDec 17 2015Dec 22 2015About 1115 rules in Astadhyayi from A.4.1.76 to A.5.4.160 deal with generation of derivative nouns, making it one of the largest topical sections in Astadhyayi, called as the Taddhita section owing to the head rule A.4.1.76. This section is a systematic ... More
Algebraic cobordism theory attached to algebraic equivalenceMar 25 2012Sep 07 2012Based on the algebraic cobordism theory of Levine and Morel, we develop a theory of algebraic cobordism modulo algebraic equivalence. We prove that this theory can reproduce Chow groups modulo algebraic equivalence and the semi-topological $K_0$-groups. ... More
Additive Chow groups of schemesFeb 06 2007We show how to make the additive Chow groups of Bloch-Esnault, Ruelling and Park into a graded module for Bloch's higher Chow groups, in the case of a smooth projective variety over a field. This yields a a projective bundle formula as well as a blow-up ... More
A module structure and a vanishing theorem for cycles with modulusDec 23 2014May 11 2016We show that the higher Chow groups with modulus of Binda-Kerz-Saito for a smooth quasi-projective scheme $X$ is a module over the Chow ring of $X$. From this, we deduce certain pull-backs, the projective bundle formula, and the blow-up formula for higher ... More
Semi-topologization in motivic homotopy theory and applicationsFeb 09 2013Oct 11 2014We study the semi-topologization functor of Friedlander-Walker from the perspective of motivic homotopy theory. We construct a triangulated endo-functor on the stable motivic homotopy category $\mathcal{SH}(\C)$, which we call \emph{homotopy semi-topologization}. ... More
The slice spectral sequence for singular schemes and applicationsJun 18 2016Aug 17 2016We examine the slice spectral sequence for the cohomology of singular schemes with respect to various motivic T-spectra, especially the motivic cobordism spectrum. When the base field k admits resolution of singularities and X is a scheme of finite type ... More
Role of uniform horizontal magnetic field on convective flowJan 26 2013The effect of uniform magnetic field applied along a fixed horizontal direction in Rayleigh-B\'enard convection in low-Prandtl-number fluids has been studied using a low dimensional model. The model shows the onset of convection (primary instability) ... More
Palindromic widths of some free constructionsDec 05 2016In this paper, we consider the palindromic widths in HNN extensions of groups and the amalgamated free products of groups. We show that the palindromic width is infinite in both the cases.
Single point Seshadri constants on rational surfacesJun 06 2017Dec 15 2017Motivated by a similar result of Dumnicki, K\"uronya, Maclean and Szemberg under a slightly stronger hypothesis, we exhibit irrational single-point Seshadri constants on a rational surface $X$ obtained by blowing up very general points of $\mathbb{P}^2_\mathbb{C}$, ... More
The Exterior Derivative - A direct approachAug 29 2018In this note we provide a direct approach to the most basic operator in this theory namely the exterior derivative. The crucial ingredient is a calculus lemma based on determinants. We maintain the view that in a first course at least this direct approach ... More
Immersed cycles and the JSJ decompositionNov 12 2018We present an algorithm to construct the JSJ decomposition of hyperbolic fundamental groups of a class of nonpositively curved square complexes. Our algorithm runs in double exponential time, and is the first algorithm on JSJ decompositions to have an ... More
The mechano-chemistry of cytoskeletal force generationApr 01 2014Apr 23 2014In this communication, we propose a model to study the non-equilibrium process by which actin stress fibers develop force in contractile cells. The emphasis here is on the non-equilibrium thermodynamics, which is necessary to address the mechanics as ... More
Bounding the First Hilbert CoefficientMay 11 2011This paper gives new bounds on the first Hilbert coefficient of an ideal of finite colength in a Cohen-Macaulay local ring. The bound given is quadratic in the multiplicity of the ideal. We compare our bound to previously known bounds, and give examples ... More
Multilevel Coding Schemes for Compute-and-ForwardOct 05 2010Jul 27 2011We investigate techniques for designing modulation/coding schemes for the wireless two-way relaying channel. The relay is assumed to have perfect channel state information, but the transmitters are assumed to have no channel state information. We consider ... More
From Entropy and Jet Quenching to Deconfinement?Feb 18 2005The challenge of demonstrating that the matter produced in heavy ion collisions is a deconfined quark-gluon plasma, as predicted by lattice QCD calculations, is the challenge of measuring the number of thermodynamic degrees of freedom \nu ~ \epsilon/T^4 ... More
Bulk Viscosity and Cavitation in Boost-Invariant Hydrodynamic ExpansionAug 12 2009Feb 16 2010We solve second order relativistic hydrodynamics equations for a boost-invariant 1+1-dimensional expanding fluid with an equation of state taken from lattice calculations of the thermodynamics of strongly coupled quark-gluon plasma. We investigate the ... More
Absence of two-flavor color-superconductivity in compact starsMar 29 2002May 17 2002The simplest pattern of color superconductivity involves BCS pairing between up and down quarks. We argue that this ``2SC'' phase will not arise within a compact star. A macroscopic volume of quark matter must be electrically neutral and must be a color ... More
Emergence of Coherent Long Wavelength Oscillations After a Quench: Application to QCDMar 18 1993To model the dynamics of the chiral order parameter in a far from equilibrium phase transition, we consider quenching in the O(4) linear sigma model. We argue, and present numerical evidence, that in the period immediately following the quench long wavelength ... More
Persistence probabilities in centered, stationary, Gaussian processes in discrete timeJan 30 2016Lower bounds for persistence probabilities of stationary Gaussian processes in discrete time are obtained under various conditions on the spectral measure of the process. Examples are given to show that the persistence probability can decay faster than ... More
Cobordism ring of toric varietiesNov 02 2010We describe the equivariant cobordism ring of smooth toric varieties. This equivariant description is used to compute the ordinary cobordism ring of such varieties.
Moving Lemma for additive Chow groups and applicationsSep 17 2009We prove moving lemma for additive higher Chow groups of smooth projective varieties. As applications, we prove the very general contravariance property of additive higher Chow groups. Using the moving lemma, we establish the structure of graded-commutative ... More
An Efficient Security Mechanism for High-Integrity Wireless Sensor NetworksNov 02 2011Jun 19 2012Wireless sensor networks (WSNs) have recently attracted a lot of interest in the research community due their wide range of applications. Unfortunately, these networks are vulnerable to numerous security threats that can adversely affect their proper ... More
Efficiency of a Stochastic Search with Punctual and Costly RestartsSep 13 2016The mean completion time of a stochastic process may be rendered finite and minimised by a judiciously chosen restart protocol, which may either be stochastic or deterministic. Here we study analytically an arbitrary stochastic search subject to an arbitrary ... More
Graph Theory and the Evolution of Autocatalytic NetworksOct 30 2002We give a self-contained introduction to the theory of directed graphs, leading up to the relationship between the Perron-Frobenius eigenvectors of a graph and its autocatalytic sets. Then we discuss a particular dynamical system on a fixed but arbitrary ... More
Emergence and Growth of Complex Networks in Adaptive SystemsOct 15 1998We consider the population dynamics of a set of species whose network of catalytic interactions is described by a directed graph. The relationship between the attractors of this dynamics and the underlying graph theoretic structures like cycles and autocatalytic ... More
A thermodynamic approach to nonlinear ultrasonics for material state awareness and prognosisOct 03 2016We develop a thermodynamic framework for modeling nonlinear ultrasonic damage sensing and prognosis in materials undergoing progressive damage. The framework is based on the internal variable approach and relies on the construction of a pseudo-elastic ... More
The Crystallography of Three-Flavor Quark MatterMay 29 2006May 30 2006We analyze and compare candidate crystal structures for the crystalline color superconducting phase that may arise in cold, dense but not asymptotically dense, three-flavor quark matter. We determine the gap parameter Delta and free energy Omega(Delta) ... More
A model for Rayleigh-Bénard magnetoconvectionAug 11 2015A model for three-dimensional Rayleigh-B\'{e}nard convection in low-Prandtl-number fluids near onset with rigid horizontal boundaries in the presence of a uniform vertical magnetic field is constructed and analyzed in detail. The kinetic energy $K$, the ... More
Spectral Statistics for Anderson Model with sporadic potentialsDec 19 2017In this paper we consider Anderson model with a large number of sites with zero interaction. For such models we study the spectral statistics in the region of complete localization. We show that Poisson statistics holds for such energies, by proving the ... More
Vertex links and the Grushko decompositionJul 17 2018We develop an algorithm of polynomial time-complexity to construct the Grushko decomposition of groups belonging to a class of CAT(0)-cubical groups, typically amalgamated products of free groups over cyclic subgroups. We impose a strong connectivity ... More
Incidence of Mg II absorption systems towards flat-spectrum radio quasarsMay 15 2012The conventional wisdom that the rate of incidence of Mg II absorption systems, dN/dz (excluding `associated systems' having velocity beta*c relative to the AGN of less than ~5000 km/s) is totally independent of the background AGN, has been challenged ... More
Do the central engines of quasars evolve by accretion ?Mar 16 1998According to a currently popular paradigm, nuclear activity in quasars is sustained via accretion of material onto super-massive black holes located at the quasar nuclei. A useful tracer of the gravitational field in the vicinity of such central black ... More
Integer Reset Timed Automata: Clock Reduction and DeterminizabilityJan 08 2010In this paper, we propose a procedure that given an integer reset timed automaton (IRTA) ${\cal A}$, produces a language equivalent deterministic one clock IRTA ${\cal B}$ whose size is at most doubly exponential in the size of ${\cal A}$. We prove that ... More