Results for "Kartik Nagar"

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CLOTHO: Directed Test Generation for Weakly Consistent Database SystemsAug 15 2019Relational database applications are notoriously difficult to test and debug. Concurrent execution of database transactions may violate complex structural invariants that constraint how changes to the contents of one (shared) table affect the contents ... More
Automated Parameterized Verification of CRDTsMay 14 2019Maintaining multiple replicas of data is crucial to achieving scalability, availability and low latency in distributed applications. Conflict-free Replicated Data Types (CRDTs) are important building blocks in this domain because they are designed to ... More
Automated Detection of Serializability Violations under Weak ConsistencyJun 21 2018While a number of weak consistency mechanisms have been developed in recent years to improve performance and ensure availability in distributed, replicated systems, ensuring correctness of transactional applications running on top of such systems remains ... More
Gravitational recoil in nonspinning black hole binaries: the span of test-mass resultsJun 26 2013Dec 16 2013We consider binary systems of coalescing, nonspinning, black holes of masses $m_{1}$ and $m_{2}$ and show that the gravitational recoil velocity for any mass ratio can be obtained accurately by extrapolating the waveform of the test-mass limit case. The ... More
Post-merger analytic templates for GW150914Jun 13 2016Following the new analytic description of the postmerger (ringdown) waveform of coalescing, nonprecessing, spinning, black hole binaries (BBHs) introduced in Phys.~Rev.~D~90, 024054 (2014), we propose an analytic, closed form, time-domain, representation ... More
Effective one body Hamiltonian of two spinning black-holes with next-to-next-to-leading order spin-orbit couplingJun 21 2011Sep 05 2013Building on the recently computed next-to-next-to-leading order (NNLO) post-Newtonian (PN) spin-orbit Hamiltonian for spinning binaries \cite{Hartung:2011te} we extend the effective-one-body (EOB) description of the dynamics of two spinning black-holes ... More
Condensation transition in a model with attractive particles and non-local hopsOct 12 2009We study a one dimensional nonequilibrium lattice model with competing features of particle attraction and non-local hops. The system is similar to a zero range process (ZRP) with attractive particles but the particles can make both local and non-local ... More
Rendezvous with SensitivityJan 19 2019Let $(X,d)$ be a compact metric space and $f:X \to X$ be a self-map. The compact dynamical system $(X,f)$ is called sensitive or sensitivity depends on initial conditions, if there is a positive constant $\delta$ such that in each non-empty open subset ... More
Alone Together: Compositional Reasoning and Inference for Weak IsolationOct 26 2017Nov 09 2017Serializability is a well-understood correctness criterion that simplifies reasoning about the behavior of concurrent transactions by ensuring they are isolated from each other while they execute. However, enforcing serializable isolation comes at a steep ... More
Molecular Gas Properties in the Central Kiloparsec of Barred and Unbarred SpiralsAug 01 2001We study the molecular gas properties in the central kiloparsec of 29 barred and 15 unbarred spirals from the BIMA Survey of Nearby Galaxies (SONG). We find that the mean nuclear molecular gas surface density of barred spirals (<Sigma_{nuc}>=309 +/- 71 ... More
The First Law of Black Hole Mechanics for Fields with Internal Gauge FreedomNov 02 2015Jun 16 2016We derive the first law of black hole mechanics for physical theories based on a local, covariant and gauge-invariant Lagrangian where the dynamical fields transform non-trivially under the action of internal gauge transformations. The theories of interest ... More
Estimating Kullback-Leibler Divergence Using Kernel MachinesMay 02 2019Recently, a method called the Mutual Information Neural Estimator (MINE) that uses neural networks has been proposed to estimate mutual information and more generally the Kullback-Leibler (KL) divergence between two distributions. The method uses the ... More
Factorisation of soft gluons in multiparton scatteringDec 22 2018Apr 11 2019We show that soft gluons exchanged between the two colliding protons in multiparton scattering processes can be decoupled, such that their effects are described by the vacuum expectation values of Wilson lines. Our argument relies on nonabelian Ward identities ... More
Residence Time Distribution of Sand Grains in the 1-Dimensional Abelian Sandpile ModelMar 31 2004We study the probability distribution of residence time, $T$, of the sand grains in the one dimensional abelian sandpile model on a lattice of $L$ sites, for $T<<L^2$ and $T>>L^2$. The distribution function decays as $\exp(-\frac{K_LT}{L^2})$. We numerically ... More
Rush the inspiral: efficient Effective One Body time-domain gravitational waveformsMay 10 2018Computationally efficient waveforms are of central importance for gravitational wave data analysis of inspiralling and coalescing compact binaries. We show that the post-adiabatic (PA) approximation to the effective-one-body (EOB) description of the binary ... More
Exact phase diagram of quasispecies model with mutation rate modifierAug 05 2008Jan 23 2009We consider an infinite asexual population with a mutator allele which can elevate mutation rates. With probability $f$, a transition from nonmutator to mutator state occurs but the reverse transition is forbidden. We find that at $f=0$, the population ... More
Passive Sliders and Scaling: from Cusps to DivergencesAug 20 2008The steady state reached by a system of particles sliding down a fluctuating surface has interesting properties. Particle clusters form and break rapidly, leading to a broad distribution of sizes and large fluctuations. The density-density correlation ... More
Factorisation of soft gluons in multiparton scatteringDec 22 2018We show that soft gluons exchanged between the two colliding protons in multiparton scattering processes can be decoupled, such that their effects are described by the vacuum expectation values of Wilson lines. Our argument relies on nonabelian Ward identities ... More
Parametrized-4.5PN TaylorF2 approximant(s) and tail effects to quartic nonlinear order from the effective one body formalismMar 23 2017Jun 05 2018By post-Newtonian (PN) expanding the well-known, factorized and resummed, effective-one-body energy flux for circularized binaries we show that: (i) because of the presence of the resummed tail factor, the 4.5PN-accurate tails-of-tails-of-tails contribution ... More
Diffusion with stochastic resetting at power-law timesDec 07 2015Jun 09 2016What happens when a continuously evolving stochastic process is interrupted with large changes at random intervals $\tau$ distributed as a power-law $\sim \tau^{-(1+\alpha)};\alpha>0$? Modeling the stochastic process by diffusion and the large changes ... More
Binary black hole merger in the extreme-mass-ratio limit: a multipolar analysisMar 02 2010Dec 14 2010Building up on previous work, we present a new calculation of the gravitational wave (GW) emission generated during the transition from quasi-circular inspiral to plunge, merger and ringdown by a binary system of nonspinning black holes, of masses $m_1$ ... More
Gravitational waves from pulsations of neutron stars described by realistic Equations of StateMar 26 2008Aug 29 2008In this work we discuss the time-evolution of nonspherical perturbations of a nonrotating neutron star described by a realistic Equation of State (EOS). We analyze 10 different EOS for a large sample of neutron star models. Various kind of generic initial ... More
Absence of jamming in ant trails: Feedback control of self propulsion and noiseOct 16 2014We present a model of ant traffic considering individual ants as self-propelled particles undergoing single file motion on a one-dimensional trail. Recent experiments on unidirectional ant traffic in well-formed natural trails showed that the collective ... More
Fast and Accurate Intrinsic Symmetry DetectionJul 26 2018Dec 05 2018In computer vision and graphics, various types of symmetries are extensively studied since symmetry present in objects is a fundamental cue for understanding the shape and the structure of objects. In this work, we detect the intrinsic reflective symmetry ... More
Fluid accretion onto relativistic stars and gravitational radiationAug 15 2004This article reports results from numerical simulations of the gravitational radiation emitted from nonrotating relativistic stars as a result of the axisymmetric accretion of layers of perfect fluid matter, shaped in the form of quadrupolar shells. We ... More
Gauge-invariant Non-spherical Metric Perturbations of Schwarzschild Black-Hole SpacetimesFeb 14 2005Apr 02 2006The theory of gauge-invariant non-spherical metric perturbations of Schwarzschild black hole spacetimes is now well established. Yet, as different notations and conventions have been used throughout the years, the literature on the subject is often confusing ... More
Horizon-absorbed energy flux in circularized, nonspinning black-hole binaries and its effective-one-body representationDec 13 2011We propose, within the effective one body (EOB) approach, a new, resummed, analytical representation of the gravitational wave energy flux absorbed by a system of two circularized (nonspinning) black holes. This expression is such to be well-behaved in ... More
A new effective-one-body description of coalescing nonprecessing spinning black-hole binariesJun 26 2014We present a new, tunable effective-one-body (EOB) model of the motion and radiation of coalescing black hole binaries with arbitrary mass ratio and aligned spins. The most novel feature of our formalism is the introduction, and systematic use, of the ... More
Relativistic tidal properties of neutron starsMay 30 2009Dec 03 2009We study the various linear responses of neutron stars to external relativistic tidal fields. We focus on three different tidal responses, associated to three different tidal coefficients: (i) a gravito-electric-type coefficient G\mu_\ell=[length]^{2\ell+1} ... More
Faithful Effective-One-Body waveforms of small-mass-ratio coalescing black-hole binariesMay 17 2007Jul 26 2007We address the problem of constructing high-accuracy, faithful analytic waveforms describing the gravitational wave signal emitted by inspiralling and coalescing binary black holes. We work within the Effective-One-Body (EOB) framework and propose a methodology ... More
Ultra-High Energy Cosmic Rays Detected by Auger and AGASA:Corrections for Galactic Magnetic Field Deflections, Source Populations, and Arguments for Multiple-ComponentsDec 11 2009The origin and composition of Ultra-High Energy Cosmic Ray Events (UHECRs) are under debate. Here we improve constraints on the source population(s) and compositions of UHECRs by accounting for UHECR deflections within existing Galactic magnetic field ... More
iResum: a new paradigm for resumming gravitational wave amplitudesJun 01 2016Sep 28 2016We introduce a new, resummed, analytical form of the post-Newtonian (PN), factorized, multipolar amplitude corrections $f_{\ell m}$ of the effective-one-body (EOB) gravitational waveform of spinning, nonprecessing, circularized, coalescing black hole ... More
Laplacian Immanantal polynomials and the GTS poset on TreesOct 06 2017Feb 27 2018Let $T$ be a tree on $n$ vertices with Laplacian $L_T$ and let $GTS_n$ be the generalized tree shift poset on the set of unlabelled trees on $n$ vertices. Inequalities are known for coefficients of the characteristic polynomial of $L_T$ as we go up the ... More
Heterojunction Vertical Band-to-Band Tunneling Transistors for Steep Subthreshold Swing and High ON CurrentMar 15 2011We propose a Heterojunction Vertical Tunneling FET and show using self-consistent ballistic quantum transport simulations that it can provide very steep subthreshold swings and high ON current, thereby improving the scalability of Tunnel FETs for high ... More
Entropy measures for complex networks: Toward an information theory of complex topologiesJul 09 2009Oct 16 2009The quantification of the complexity of networks is, today, a fundamental problem in the physics of complex systems. A possible roadmap to solve the problem is via extending key concepts of information theory to networks. In this paper we propose how ... More
Hybrid gap modes induced by fiber taper waveguides: application in spectroscopy of single solid-state emitters deposited on thin filmsFeb 19 2010We show, via simulations, that an optical fiber taper waveguide can be an efficient tool for photoluminescence and resonant, extinction spectroscopy of single emitters, such as molecules or colloidal quantum dots, deposited on the surface of a thin dielectric ... More
Stability and dynamical properties of material flow systems on random networksFeb 12 2009The theory of complex networks and of disordered systems is used to study the stability and dynamical properties of a simple model of material flow networks defined on random graphs. In particular we address instabilities that are characteristic of flow ... More
Automorphic cohomology, motivic cohomology, and the adjoint $L$-functionSep 20 2016Jan 12 2017We propose a relationship between the cohomology of arithmetic groups, and the motivic cohomology of certain (Langlands-)attached motives. The motivic cohomology group in question is that related, by Beilinson's conjecture, to the adjoint $L$-function ... More
Derivative Corrections To The Sphaleron EnergyNov 25 1996We investigate the effects of inhomogeneous scalar field configurations on effective action at finite temperature. Recently, Walliser et al. have calculated the leading perturbative corrections to the wave function correction term $Z(\phi,T)$, for the ... More
Ultra-High Energy Cosmic Rays Detected by the Pierre Auger Observatory: First Direct Evidence, and its Implications, that a Subset Originate in Nearby RadiogalaxiesJun 19 2008(abridged) The Pierre Auger Collaboration has reported 27 Ultra-High Energy Cosmic Ray Events (UHECRs) with energies above 56 EeV and well determined arrival directions as of 2007 August 31. They find that the arrival directions are not isotropic, but ... More
An analytic family of post-merger template waveformsJun 13 2016Jan 12 2017Building on the analytical description of the post-merger (ringdown) waveform of coalescing, non-precessing, spinning, (BBHs) introduced in Phys. Rev. D 90, 024054 (2014), we propose an analytic, closed form, time-domain, representation of the $\ell=m=2$ ... More
An analytic family of post-merger template waveformsJun 13 2016Nov 15 2016Building on the analytical description of the post-merger (ringdown) waveform of coalescing, non-precessing, spinning, (BBHs) introduced in Phys.~Rev.~D~90, 024054 (2014), we propose an analytic, closed form, time-domain, representation of the $\ell=m=2$ ... More
Automorphic cohomology, motivic cohomology, and the adjoint $L$-functionSep 20 2016We propose a relationship between the cohomology of arithmetic groups, and the motivic cohomology of certain (Langlands-)attached motives. The motivic cohomology group in question is that related, by Beilinson's conjecture, to the adjoint $L$-function ... More
Phase Transitions in Operational RiskSep 14 2006Dec 06 2006In this paper we explore the functional correlation approach to operational risk. We consider networks with heterogeneous a-priori conditional and unconditional failure probability. In the limit of sparse connectivity, self-consistent expressions for ... More
Symmetries, charges and conservation laws at causal diamonds in general relativityJul 31 2019We study the covariant phase space of vacuum general relativity at the null boundary of causal diamonds. The past and future components of such a null boundary each have an infinite-dimensional symmetry algebra consisting of diffeomorphisms of the $2$-sphere ... More
Periods of quaternionic Shimura varieties. IOct 01 2016We study "quadratic periods" on quaternionic Shimura varieties and formulate an integral refinement of Shimura's conjecture regarding Petersson inner products of automorphic forms that are related by the Jacquet-Langlands correspondence. The main result ... More
Fiber-coupled semiconductor waveguides as an efficient optical interface to a single quantum dipoleMay 18 2009Sep 17 2009We theoretically investigate the interaction of a single quantum dipole with the modes of a fiber-coupled semiconductor waveguide. Through a combination of tight modal confinement and phase-matched evanescent coupling, we predict that approximately 70 ... More
Energetics of a rotating charged black hole in 5-dimensional supergravityFeb 18 2009Jan 08 2010We investigate the properties of the event horizon and static limit for a charged rotating black hole solution of minimal supergravity theory in (1 + 4) dimension. Unlike the four-dimensional case, there are in general two rotations, and they couple to ... More
Guiding CTC Posterior Spike Timings for Improved Posterior Fusion and Knowledge DistillationApr 17 2019Conventional automatic speech recognition (ASR) systems trained from frame-level alignments can easily leverage posterior fusion to improve ASR accuracy and build a better single model with knowledge distillation. End-to-end ASR systems trained using ... More
Gibbs entropy of networks ensembles by cavity methodsJan 26 2010May 25 2010The Gibbs entropy of a microcanonical network ensemble is the logarithm of the number of network configurations compatible with a set of hard constraints. This quantity characterizes the level of order and randomness encoded in features of a given real ... More
Bonsai: Synthesis-Based Reasoning for Type SystemsAug 01 2017We describe algorithms for symbolic reasoning about executable models of type systems, supporting three queries intended for designers of type systems. First, we check for type soundness bugs and synthesize a counterexample program if such a bug is found. ... More
Robustness of the Drosophila segment polarity network to transient perturbationsJun 18 2009Continuous and Boolean models for the Drosophila segment polarity network have shown that the system is able to maintain the wild-type pattern when subjected to sustained changes in the interaction parameters and initial conditions. Embryo development ... More
Herding the Crowd: Automated Planning for Crowdsourced PlanningJul 29 2013There has been significant interest in crowdsourcing and human computation. One subclass of human computation applications are those directed at tasks that involve planning (e.g. travel planning) and scheduling (e.g. conference scheduling). Much of this ... More
Efficient spectroscopy of single embedded emitters using optical fiber taper waveguidesApr 17 2009Jun 11 2009A technique based on using optical fiber taper waveguides for probing single emitters embedded in thin dielectric membranes is assessed through numerical simulations. For an appropriate membrane geometry, photoluminescence collection efficiencies in excess ... More
Gravitational Waves from Nonlinear Couplings of Radial and Polar Nonradial Modes in Relativistic StarsFeb 17 2007The post-bounce oscillations of newly-born relativistic stars are expected to lead to gravitational-wave emission through the excitation of nonradial oscillation modes. At the same time, the star is oscillating in its radial modes, with a central density ... More
Binary black hole coalescence in the extreme-mass-ratio limit: testing and improving the effective-one-body multipolar waveformDec 11 2010Mar 10 2011We discuss the properties of the effective-one-body (EOB) multipolar gravitational waveform emitted by nonspinning black-hole binaries of masses $\mu$ and $M$ in the extreme-mass-ratio limit, $\mu/M=\nu\ll 1$. We focus on the transition from quasicircular ... More
Improved effective-one-body description of coalescing nonspinning black-hole binaries and its numerical-relativity completionDec 18 2012Apr 15 2013We improve the effective-one-body (EOB) description of nonspinning coalescing black hole binaries by incorporating several recent analytical advances, notably: (i) logarithmic contributions to the conservative dynamics; (ii) resummed horizon-absorption ... More
Improved resummation of post-Newtonian multipolar waveforms from circularized compact binariesNov 13 2008Mar 11 2009We improve and generalize a resummation method of post-Newtonian multipolar waveforms from circular compact binaries introduced in Refs. \cite{Damour:2007xr,Damour:2007yf}. One of the characteristic features of this resummation method is to replace the ... More
Black Hole Instabilities and Exponential GrowthJan 12 2015Aug 26 2015Recently, a general analysis has been given of the stability with respect to axisymmetric perturbations of stationary-axisymmetric black holes and black branes in vacuum general relativity in arbitrary dimensions. It was shown that positivity of canonical ... More
The role of entanglement in quantum measurementMay 24 2019Measurement processes can be separated into an entangling interaction between the system and a meter and a subsequent read-out of the meter state that does not involve any further interactions with the system. In the interval between these two stages, ... More
Lexical State AnalyzerAug 14 2013Lexical states provide a powerful mechanism to scan regular expressions in a context sensitive manner. At the same time, lexical states also make it hard to reason about the correctness of the grammar. We first categorize the related correctness issues ... More
Structure, molecular dynamics, and stress in a linear polymer under dynamic strainDec 27 2010The structural properties of a linear polymer and its evolution in time have a strong bearing on its anisotropic stress response. The mean-square bond length and mean bond angle are the critical parameters that influence the time-varying stress developed ... More
Variations on the Concept of Topological TransitivityJan 21 2016We describe various strengthenings of the concept of topological transitivity. Especially when one departs from the family of invertible systems, a number of interesting properties arise. We present the architecture of implications among ten reasonable ... More
On the time delay in binary systemsJan 19 2005Jan 28 2005The aim of this paper is to study the time delay on electromagnetic signals propagating across a binary stellar system. We focus on the antisymmetric gravitomagnetic contribution due to the angular momentum of one of the stars of the pair. Considering ... More
Compact radio cores: from the first black holes to the lastSep 06 2004One of the clearest signs of black hole activity is the presence of a compact radio core in the nuclei of galaxies. With the Square Kilometer Array (SKA) these cores can be used to study the evolution of black holes throughout the universe and even to ... More
Factorization and resummation: A new paradigm to improve gravitational wave amplitudes. II: the higher multipolar modesJan 08 2018The factorization and resummation approach of Nagar and Shah~[Phys.~Rev.~D~94 (2016), 104017], designed to improve the strong-field behavior of the post-Newtonian (PN) residual waveform amplitudes $f_{\ell m}$'s entering the effective-one-body, circularized, ... More
Accuracy and effectualness of closed-form, frequency-domain waveforms for non-spinning black hole binariesSep 29 2010Dec 14 2010The coalescences of binary black hole (BBH) systems, here taken to be non-spinning, are among the most promising sources for gravitational wave (GW) ground-based detectors, such as LIGO and Virgo. To detect the GW signals emitted by BBHs, and measure ... More
Radio-Quiet AGN and the Transient Radio SkyFeb 15 2011Jul 22 20118.4-GHZ radio imaging study of an optically selected sample of early type Seyfert galaxies; comparison of images taken at two epochs reveals possible variation in the nuclear radio flux density in five of them over a seven year period. It is shown that ... More
Dynamics of Induced SystemsDec 07 2014In this paper, we study the dynamical properties of actions on the space of compact subsets of the phase space. More precisely, if $X$ is a metric space, let $2^X$ denote the space of non-empty compact subsets of $X$ provided with the Hausdorff topology. ... More
Modeling the complete gravitational wave spectrum of neutron star mergersApr 07 2015Aug 17 2015In the context of neutron star mergers, we study the gravitational wave spectrum of the merger remnant using numerical relativity simulations. Postmerger spectra are characterized by a main peak frequency $f_2$ related to the particular structure and ... More
Dynamical excitation of space-time modes of compact objectsJan 14 2008Mar 06 2008We discuss, in the perturbative regime, the scattering of Gaussian pulses of odd-parity gravitational radiation off a non-rotating relativistic star and a Schwarzschild Black Hole. We focus on the excitation of the $w$-modes of the star as a function ... More
Clustering of advected passive sliders on a fluctuating surfaceMar 29 2004We study the clustering properties of advected, non-interacting,passive scalar particles in a Burgers fluid with noise, a problem which maps to that of passive sliding particles moving under gravity on a surface evolving through the Kardar-Parisi-Zhang ... More
Aluminum Abundances, Deep Mixing and the Blue-Tail Second-Parameter Effect in the Globular Clusters M 3 and M 13Feb 29 2000May 19 2000We explore the relatiohsip between deep mixing on the red-giant branch and the second parameter that gives rise to the extended blue tail seen on the horizontal branch of the globular cluster M 13. We use the [Al/Fe] values of 96 RGB stars and the [Na/Fe] ... More
Boundary-induced abrupt transition in the symmetric exclusion processApr 26 2008Jun 16 2008We investigate the role of the boundary in the symmetric simple exclusion process with competing nonlocal and local hopping events. With open boundaries, the system undergoes a first order phase transition from a finite density phase to an empty road ... More
Sub-nanosecond Electro-optic Modulation of Triggered Single Photons from a Quantum DotMar 18 2011Control of single photon wave-packets is an important resource for developing hybrid quantum systems which are composed of different physical systems interacting via photons. Here we extend this control to triggered photons emitted by a quantum dot, temporally ... More
Electrons and composite Dirac fermions in the lowest Landau levelSep 08 2017We construct an action for the composite Dirac fermion consistent with symmetries of electrons projected to the lowest Landau level. First we construct a generalization of the $g=2$ electron that gives a smooth massless limit on any curved background. ... More
Risk-Stratify: Confident Stratification Of Patients Based On RiskNov 02 2018A clinician desires to use a risk-stratification method that achieves confident risk-stratification - the risk estimates of the different patients reflect the true risks with a high probability. This allows him/her to use these risks to make accurate ... More
Relations between Information and Estimation in Discrete-Time Lévy ChannelsApr 27 2014Feb 01 2017Fundamental relations between information and estimation have been established in the literature for the discrete-time Gaussian and Poisson channels. In this work, we demonstrate that such relations hold for a much larger class of observation models. ... More
Analysis of InAs Vertical and Lateral Band-to-Band Tunneling Transistors: Leveraging Vertical Tunneling for Improved PerformanceNov 16 2010Using self-consistent quantum transport simulation on realistic devices, we show that InAs band-to-band Tunneling Field Effect Transistors (TFET) with a heavily doped pocket in the gate-source overlap region can offer larger ON current and steeper subthreshold ... More
Higher order geometric flows on three dimensional locally homogeneous spacesAug 02 2011Dec 14 2012We analyse second order (in Riemann curvature) geometric flows (un-normalised) on locally homogeneous three manifolds and look for specific features through the solutions (analytic whereever possible, otherwise numerical) of the evolution equations. Several ... More
2-D studies of Relativistic electron beam plasma instabilities in an inhomogeneous plasmaJul 29 2015Relativistic electron beam propagation in plasma is fraught with several micro instabilities like two stream, filamentation etc., in plasma. This results in severe limitation of the electron transport through a plasma medium. Recently, however, there ... More
Efficient and low-noise single-photon-level frequency conversion interfaces using silicon nanophotonicsOct 08 2015Optical frequency conversion has applications ranging from tunable light sources to telecommunications-band interfaces for quantum information science. Here, we demonstrate efficient, low-noise frequency conversion on a nanophotonic chip through four-wave-mixing ... More
Si$_3$N$_4$ nanobeam optomechanical crystalsNov 21 2014Dec 04 2014The development of Si$_3$N$_4$ nanobeam optomechanical crystals is reviewed. These structures consist of a 350 nm thick, 700 nm wide doubly-clamped Si$_3$N$_4$ nanobeam that is periodically patterned with an array of air holes to which a defect region ... More
Superconducting behavior of the solid solution, Y2Pd(1-x)Pt(x)Ge3Jun 09 2007Jun 12 2007The compound Y2PdGe3 was earlier reported by us to be one of the very few ternary superconducting compounds (T_c= 3 K) belonging to the same structure as that of MgB2. Here we report the results of electrical resistivity, magnetization and heat capacity ... More
Covariant effective action for a Galilean invariant quantum Hall systemMar 29 2016Sep 18 2016We construct effective field theories for gapped quantum Hall systems coupled to background geometries with local Galilean invariance i.e. Bargmann spacetimes. Along with an electromagnetic field, these backgrounds include the effects of curved Galilean ... More
The Metrics Matter! On the Incompatibility of Different Flavors of ReplanningMay 12 2014When autonomous agents are executing in the real world, the state of the world as well as the objectives of the agent may change from the agent's original model. In such cases, the agent's planning process must modify the plan under execution to make ... More
Near-IR dust and line emission from the central region of Mrk1066: Constraints from Gemini NIFSDec 31 2009Jan 08 2010We present integral field spectroscopy of the inner 350 pc of the Mrk1066 obtained with Gemini NIFS at a spatial resolution of 35 pc. This high spatial resolution allowed us to observe, for the first time in this galaxy, an unresolved dust concentration ... More
Quasiuniversal properties of neutron star mergersFeb 25 2014Jun 06 2014Binary neutron star mergers are studied using nonlinear 3+1 numerical relativity simulations and the analytical effective-one-body (EOB) model. The EOB model predicts quasiuniversal relations between the mass-rescaled gravitational wave frequency and ... More
Radio Variability in Seyfert NucleiJul 09 2009Comparison of 8.4-GHz radio images of a sample of 11 early-type Seyfert galaxies with previous observations reveals possible variation in the nuclear radio flux density in 5 of them over a 7-yr period. We find no correlation between radio variability ... More
Accurate numerical simulations of inspiralling binary neutron stars and their comparison with effective-one-body analytical modelsMar 20 2011Oct 12 2011Binary neutron-star systems represent one of the most promising sources of gravitational waves. In order to be able to extract important information, notably about the equation of state of matter at nuclear density, it is necessary to have in hands an ... More
Energy versus Angular Momentum in Black Hole BinariesOct 13 2011Using accurate numerical relativity simulations of (nonspinning) black-hole binaries with mass ratios 1:1, 2:1 and 3:1 we compute the gauge invariant relation between the (reduced) binding energy $E$ and the (reduced) angular momentum $j$ of the system. ... More
Financial crises and the evaporation of trustNov 16 2009Trust lies at the crux of most economic transactions, with credit markets being a notable example. Drawing on insights from the literature on coordination games and network growth, we develop a simple model to clarify how trust breaks down in financial ... More
Flexible Byzantine Fault ToleranceApr 22 2019Existing Byzantine fault tolerant (BFT) protocols work in a homogeneous model where a service administrator picks a set of assumptions (timing model and the fraction of Byzantine faults) and imposes these assumptions on all clients using the service. ... More
On the static Lovelock black holesJan 20 2012May 28 2013We consider static spherically symmetric Lovelock black holes and generalize the dimensionally continued black holes in such a way that they asymptotically for large r go over to the d-dimensional Schwarzschild black hole in dS/AdS spacetime. This means ... More
Ricci flow of unwarped and warped product manifoldsAug 10 2009Sep 16 2009We analyse Ricci flow (normalised/un-normalised) of product manifolds --unwarped as well as warped, through a study of generic examples. First, we investigate such flows for the unwarped scenario with manifolds of the type $\mathbb S^n\times \mathbb S^m$, ... More
Nonlinear Oscillations and Bifurcations in Silicon Photonic MicroresonatorsOct 15 2013Feb 26 2014Silicon microdisks are optical resonators that can exhibit surprising nonlinear behavior. We present a new analysis of the dynamics of these resonators, elucidating the mathematical origin of spontaneous oscillations and deriving predictions for observed ... More
Dynamic Assessments, Matching and Allocation of TasksFeb 07 2016Sep 13 2016In many two-sided markets, each side has incomplete information about the other but has an opportunity to learn (some) relevant information before final matches are made. For instance, clients seeking workers to perform tasks often conduct interviews ... More
Relations between Information and Estimation in Scalar Lévy ChannelsApr 27 2014Fundamental relations between information and estimation have been established in the literature for the scalar Gaussian and Poisson channels. In this work, we demonstrate that such relations hold for a much larger class of observation models. We introduce ... More
Mutual Information, Relative Entropy and Estimation Error in Semi-martingale ChannelsApr 18 2017Fundamental relations between information and estimation have been established in the literature for the continuous-time Gaussian and Poisson channels, in a long line of work starting from the classical representation theorems by Duncan and Kabanov respectively. ... More
Accelerating PageRank using Partition-Centric ProcessingSep 21 2017Aug 06 2018PageRank is a fundamental link analysis algorithm that also functions as a key representative of the performance of Sparse Matrix-Vector (SpMV) multiplication. The traditional PageRank implementation generates fine granularity random memory accesses resulting ... More