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Results for "Lalith Suresh"

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Hillview: A trillion-cell spreadsheet for big dataJul 10 2019Hillview is a distributed spreadsheet for browsing very large datasets that cannot be handled by a single machine. As a spreadsheet, Hillview provides a high degree of interactivity that permits data analysts to explore information quickly along many ... More
Elmo: Source-Routed Multicast for Cloud ServicesFeb 27 2018May 31 2018We present Elmo, a system that addresses the multicast scalability problem in multi-tenant data centers. Modern cloud applications frequently exhibit one-to-many communication patterns and, at the same time, require sub-millisecond latencies and high ... More
Novel Framework for Spectral Clustering using Topological Node Features(TNF)Mar 31 2017Apr 08 2017Spectral clustering has gained importance in recent years due to its ability to cluster complex data as it requires only pairwise similarity among data points with its ease of implementation. The central point in spectral clustering is the process of ... More
Stable and Consistent Membership at Scale with RapidMar 09 2018We present the design and evaluation of Rapid, a distributed membership service. At Rapid's core is a scheme for multi-process cut detection (CD) that revolves around two key insights: (i) it suspects a failure of a process only after alerts arrive from ... More
BKM Lie superalgebras from counting twisted CHL dyonsJun 17 2010Jun 02 2011Following Sen[arXiv:0911.1563], we study the counting of (`twisted') BPS states that contribute to twisted helicity trace indices in four-dimensional CHL models with N=4 supersymmetry. The generating functions of half-BPS states, twisted as well as untwisted, ... More
Punctures in W-string theoryMar 25 1997May 15 1997Using the differential equation approach to W-algebras, we discuss the inclusion of punctures in W-string theory. The key result is the existence of different kinds of punctures in W-strings. This is similar to the NS and R punctures occuring in superstring ... More
Anisotropic model of dark energy dominated universe with hybrid expansion lawOct 08 2010Aug 22 2013The paper deals with the study of the dynamics of Universe within the framework of a spatially homogeneous Bianchi-V space-time filled with a perfect fluid composed of non-interacting matter and dynamical dark energy components. We determine the Bianchi-V ... More
String Cosmology in Anisotropic Bianchi-II Space-timeOct 01 2010Jan 14 2011The present study deals with a spatially homogeneous and anisotropic Bianchi-II cosmological model representing massive strings. The energy-momentum tensor, as formulated by Letelier (1983), has been used to construct a massive string cosmological model ... More
A note on M(atrix) theory in seven dimensions with eight superchargesMay 15 1997Aug 05 1997We consider M(atrix) theory compactifications to seven dimensions with eight unbroken supersymmetries. We conjecture that both M(atrix) theory on K3 and Heterotic M(atrix) theory on T^3 are described by the same 5+1 dimensional theory with N=2 supersymmetry ... More
Consistency of the nonflat $Λ$CDM model with the new result from BOSSJul 13 2015Dec 01 2015Using 137,562 quasars in the redshift range $2.1\leq z\leq3.5$ from the Data Release 11 (DR11) of the Baryon Oscillation Spectroscopic Survey (BOSS) of Sloan Digital Sky Survey (SDSS)-III, the BOSS-SDSS collaboration estimated the expansion rate $H(z=2.34)=222\pm7$ ... More
Probing the matter and dark energy sources in a viable Big Rip model of the UniverseApr 07 2014Aug 13 2014Chevallier-Polarski-Linder (CPL) parametrization for the equation of state of dark energy in terms of cosmic redshift or scale factor have been frequently studied in the literature. In this study, we consider cosmic time based CPL parametrization for ... More
Third Galois cohomology group of function fields of curves over number fieldsJun 09 2017Let F be the function field of a curve over totally imaginary number field. Let p be a prime. If F contains a primitive p th root of unity, then every element in the third Galois cohomology group of F with values in the group of p th roots of unity, is ... More
Heterotic M(atrix) theory at generic points in Narain moduli spaceJul 18 1997Jul 30 1997Type II compactifications with varying string coupling can be described elegantly in F-theory/M-theory as compactifications on U - manifolds. Using a similar approach to describe Super Yang-Mills with a varying coupling constant, we argue that at generic ... More
Higher dimensional uniformisation and W-geometryDec 09 1994Oct 13 1995We formulate the uniformisation problem underlying the geometry of W_n-gravity using the differential equation approach to W-algebras. We construct W_n-space (analogous to superspace in supersymmetry) as an (n-1) dimensional complex manifold using isomonodromic ... More
Notes on higher-dimensional partitionsMar 20 2012We show the existence of a series of transforms that capture several structures that underlie higher-dimensional partitions. These transforms lead to a sequence of triangles whose entries are given combinatorial interpretations as the number of particular ... More
Observational constraints on Hubble constant and deceleration parameter in power-law cosmologySep 20 2011Apr 15 2013In this paper, we show that the expansion history of the Universe in power-law cosmology essentially depends on two crucial parameters, namely the Hubble constant $H_{0}$ and deceleration parameter $q$. We find the constraints on these parameters from ... More
Deterministic Consistency Checking of LP ConstraintsFeb 14 1995Feb 16 1995We provide a constraint based computational model of linear precedence as employed in the HPSG grammar formalism. An extended feature logic which adds a wide range of constraints involving precedence is described. A sound, complete and terminating deterministic ... More
Covariantising the Beltrami equation in W-gravityApr 03 1995Oct 13 1995Recently, certain higher dimensional complex manifolds were obtained in [hep-th/9412078] by associating a higher dimensional uniformisation to the generalised Teichm\"uller spaces of Hitchin. The extra dimensions are provided by the ``times'' of the generalised ... More
An Attributive Logic of Set Descriptions and Set OperationsMay 30 1994This paper provides a model theoretic semantics to feature terms augmented with set descriptions. We provide constraints to specify HPSG style set descriptions, fixed cardinality set descriptions, set-membership constraints, restricted universal role ... More
A Statistical Block Fading Channel Model for Multiuser Massive MIMO SystemMar 04 2016This paper presents a statistical block fading channel model for multiuser massive MIMO system. The proposed channel model is evolved from correlation based stochastic channel model (CBSCM) but in addition to the properties of CBSCM, it has capability ... More
Unravelling Mathieu MoonshineJun 28 2011Apr 23 2012The D1-D5-KK-p system naturally provides an infinite dimensional module graded by the dyonic charges whose dimensions are counted by the Igusa cusp form, Phi_{10}(Z)$. We show that the Mathieu group, M_{24}, acts on this module by recovering the Siegel ... More
Brewing moonshine for MathieuDec 28 2010We propose a moonshine for the sporadic Mathieu group M_12 that relates its conjugacy classes to various modular forms and Borcherds Kac-Moody Lie superalgebras.
On the Geometry of W_n gravityMay 30 1994We report work done with T. Jayaraman (hep-th/9405146) in this talk. In a recent paper, Hitchin introduced generalisations of the Teichmuller space of Riemann surfaces. We relate these spaces to the Teichmuller spaces of W-gravity. We show how this provides ... More
The Graphics Card as a Streaming ComputerOct 05 2003Oct 07 2003Massive data sets have radically changed our understanding of how to design efficient algorithms; the streaming paradigm, whether it in terms of number of passes of an external memory algorithm, or the single pass and limited memory of a stream algorithm, ... More
Some FRW Models of Accelerating Universe with Dark EnergyOct 01 2010The paper deals with a spatially homogeneous and isotropic FRW space-time filled with perfect fluid and dark energy components. The two sources are assumed to interact minimally, and therefore their energy momentum tensors are conserved separately. A ... More
"Improved FCM algorithm for Clustering on Web Usage Mining"Apr 11 2011In this paper we present clustering method is very sensitive to the initial center values, requirements on the data set too high, and cannot handle noisy data the proposal method is using information entropy to initialize the cluster centers and introduce ... More
Dispersion Relation for Alfven Waves in a Viscous, Diffusive PlasmaJun 16 2007Propagation of Alfven waves in the solar plasma has been a topic of scientific interest for a long time. We have derived a dispersion relation for shear Alfven waves in a viscous and diffusive plasma.
Pasting pseudofunctorsJun 24 2004We give an abstract criterion for pasting pseudofunctors on two subcategories of a category into a pseudofunctor on the whole category. As an application we extend the variance theory of the twisted inverse image $(-)^!$ over schemes to that over formal ... More
Cross-Domain Conditional Generative Adversarial Networks for Stereoscopic Hyperrealism in Surgical TrainingJun 24 2019Phantoms for surgical training are able to mimic cutting and suturing properties and patient-individual shape of organs, but lack a realistic visual appearance that captures the heterogeneity of surgical scenes. In order to overcome this in endoscopic ... More
Cardy and KerrSep 06 2009Feb 02 2010The Kerr/CFT correspondence employs the Cardy formula to compute the entropy of the left moving CFT states. This computation, which correctly reproduces the Bekenstein--Hawking entropy of the four-dimensional extremal Kerr black hole, is performed in ... More
Estimating the asymptotics of solid partitionsJun 21 2014We study the asymptotic behavior of solid partitions using transition matrix Monte Carlo simulations. If $p_3(n)$ denotes the number of solid partitions of an integer $n$, we show that $\lim_{n\rightarrow\infty} n^{-3/4} \log p_3(n)\sim 1.822\pm 0.001$. ... More
Grothendieck Duality and Transitivity II: Traces and Residues via Verdier's isomorphismMar 05 2019For a smooth map between noetherian schemes, Verdier relates the top relative differentials of the map with the twisted inverse image functor `upper shriek'. We show that the associated traces for smooth proper maps can be rendered concrete by showing ... More
Grothendieck Duality and Transitivity I: Formal SchemesMar 05 2019Mar 22 2019For a proper map $f\colon X\to Y$ of noetherian ordinary schemes, one has a well-known natural transformation, ${\bf L}^*f^*(-)\overset{\bf L}{\otimes} f^!{\mathcal{O}}_Y\to f^!$, obtained via the projection formula, which extends, using Nagata's compactification, ... More
Planning under risk and uncertainty based on Prospect-theoretic modelsApr 05 2019In this work, we develop a novel sampling-based motion planing approach to generate plans in a risky and uncertain environment. To model a variety of risk-sensitivity profiles, we propose an adaption of Cumulative Prospect Theory (CPT) to the setting ... More
Gesture based Human-Swarm Interactions for Formation Control using interpretersApr 23 2018We propose a novel Human-Swarm Interaction (HSI) framework which enables the user to control a swarm shape and formation. The user commands the swarm utilizing just arm gestures and motions which are recorded by an off-the-shelf wearable armband. We propose ... More
New Perspectives on Attractor Flows and Trees from CFTSep 29 2010Oct 24 2011In this note, we use the first order formalism for attractor flows in N=2 SUGRA extremal black hole backgrounds to establish a formal correspondence between the RG flow of moduli in the underlying N=(2,2) SCFT and bulk attractor flows. Starting from a ... 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
The u-invariant of the function fields of p-adic curvesAug 23 2007The u-invariant of a field is the maximum dimension of ansiotropic quadratic forms over the field. It is an open question whether the u-invariant of function fields of p-aidc curves is 8. In this paper, we answer this question in the affirmative for function ... More
On the u-Invariant of Function Fields of Curves Over Complete Discretely Valued FieldsApr 13 2014Let K be a complete discretely valued field with residue field k. If char(K) = 0, char(k) = 2 and the 2-rank of k is d, we prove that there exists an integer N depending on d such that the u-invariant of any function field in one variable over K is bounded ... More
On the Landau-Ginzburg description of Boundary CFTs and special Lagrangian submanifoldsMar 27 2000Mar 30 2000We consider Landau-Ginzburg (LG) models with boundary conditions preserving A-type N=2 supersymmetry. We show the equivalence of a linear class of boundary conditions in the LG model to a particular class of boundary states in the corresponding CFT by ... More
Orientifolds of type IIA strings on Calabi-Yau manifoldsMay 13 2003We identify type IIA orientifolds that are dual to M-theory compactifications on manifolds with G_2-holonomy. We then discuss the construction of crosscap states in Gepner models. (Based on a talk presented by S.G. at PASCOS 2003 held at the Tata Institute ... More
D-branes and Vector Bundles on Calabi-Yau Manifolds: a view from the HelixMay 22 2001We review some recent results on D-branes on Calabi-Yau (CY) manifolds. We show the existence of structures (helices and quivers) which enable one to make statements about large families of D-branes in various phases of the Gauged Linear Sigma Model (GLSM) ... More
High Quality of Service on Video Streaming in P2P Networks using FST-MDCMay 27 2011Video streaming applications have newly attracted a large number of participants in a distribution network. Traditional client-server based video streaming solutions sustain precious bandwidth provision rate on the server. Recently, several P2P streaming ... More
Event-Flow Graphs for Efficient Path-Sensitive AnalysesApr 04 2014Mar 08 2015Efficient and accurate path-sensitive analyses pose the challenges of: (a) analyzing an exponentially-increasing number of paths in a control-flow graph (CFG), and (b) checking feasibility of paths in a CFG. We address these challenges by introducing ... More
Perturbation of the semiclassical Schrödinger equation on negatively curved surfacesMay 13 2014Feb 01 2015We consider the semiclassical Schr\"odinger equation on a compact negatively curved surface. For any sequence of initial data microlocalized on the unit cotangent bundle, we look at the quantum evolution (below the Ehrenfest time) under small perturbations ... More
A note on perturbative aspects of Leigh-Strassler deformed N=4 SYM theoryOct 30 2007We carry out a perturbative study of the Leigh-Strassler deformed N=4 SYM theory in order to verify that the trihedral Delta(27) symmetry holds in the quantum theory. We show that the Delta(27) symmetry is preserved to two loops (at finite N) by explicitly ... More
Chiral primaries in the Leigh-Strassler deformed N=4 SYM -- a perturbative studyMar 02 2007May 08 2007We look for chiral primaries in the general Leigh-Strassler deformed N=4 super Yang-Mills theory by systematically computing the planar one-loop anomalous dimension for single trace operators up to dimension six. The operators are organised into representations ... More
Evaluation of Complex-Valued Neural Networks on Real-Valued Classification TasksNov 29 2018Complex-valued neural networks are not a new concept, however, the use of real-valued models has often been favoured over complex-valued models due to difficulties in training and performance. When comparing real-valued versus complex-valued neural networks, ... More
Grothendieck Duality and Transitivity II: Traces and Residues via Verdier's isomorphismMar 05 2019Mar 22 2019For a smooth map between noetherian schemes, Verdier relates the top relative differentials of the map with the twisted inverse image functor `upper shriek'. We show that the associated traces for smooth proper maps can be rendered concrete by showing ... More
Multimodal deep learning for short-term stock volatility predictionDec 25 2018Stock market volatility forecasting is a task relevant to assessing market risk. We investigate the interaction between news and prices for the one-day-ahead volatility prediction using state-of-the-art deep learning approaches. The proposed models are ... More
Applications of duality theory to cousin complexesDec 05 2005Jul 10 2007We use the anti-equivalence between Cohen-Macaulay complexes and coherent sheaves on formal schemes to shed light on some older results and prove new results. We bring out the relations between a coherent sheaf M satisfying an S_2 condition and the lowest ... More
A Class of degenerate Stochastic differential equations with non-Lipschitz coefficientsApr 17 2009We obtain sufficient condition for SDEs to evolve in the positive orthant. We use comparison theorem arguments to achieve this. As a result we prove the existence of a unique strong solution for a class of multidimensional degenerate SDEs with non-Lipschitz ... More
Final Muon Emittance Exchange in Vacuum for a ColliderMay 07 2015We outline a plan for final muon ionization cooling with quadrupole doublets focusing onto short absorbers followed by emittance exchange in vacuum to achieve the small transverse beam sizes needed by a muon collider. A flat muon beam with a series of ... More
Degree three cohomology of function fields of surfacesDec 24 2010Jun 05 2014Let F be a finite field and l a prime not equal to the characteristic of F. Let K be the function field of a surface over F. Assume that K contains a primitive lth root of unity. In the paper we prove a certain local-global principle for elements of H^3(K, ... More
Effective superpotentials for B-branes in Landau-Ginzburg modelsAug 03 2006We compute the partition function for the topological Landau-Ginzburg B-model on the disk. This is done by treating the worldsheet superpotential perturbatively. We argue that this partition function as a function of bulk and boundary perturbations may ... More
Crosscaps in Gepner Models and Type IIA OrientifoldsJun 26 2003Feb 24 2004As a first step to a detailed study of orientifolds of Gepner models associated with Calabi-Yau manifolds, we construct crosscap states associated with anti-holomorphic involutions (with fixed points) of Calabi-Yau manifolds. We argue that these orientifolds ... More
Boundary Fermions, Coherent Sheaves and D-branes on Calabi-Yau manifoldsApr 14 2001Apr 19 2001We construct boundary conditions in the gauged linear sigma model for B-type D-branes on Calabi-Yau manifolds that correspond to coherent sheaves given by the cohomology of a monad. This necessarily involves the introduction of boundary fields, and in ... More
Autodetection and Classification of Hidden Cultural City Districts from Yelp ReviewsJan 12 2015Topic models are a way to discover underlying themes in an otherwise unstructured collection of documents. In this study, we specifically used the Latent Dirichlet Allocation (LDA) topic model on a dataset of Yelp reviews to classify restaurants based ... More
Bianchi type II models in the presence of perfect fluid and anisotropic dark energyOct 11 2011Jun 15 2012Spatially homogeneous but totally anisotropic and non-flat Bianchi type II cosmological model has been studied in general relativity in the presence of two minimally interacting fluids; a perfect fluid as the matter fluid and a hypothetical anisotropic ... More
Grothendieck Duality and Transitivity I: Formal SchemesMar 05 2019For a proper map $f\colon X\to Y$ of noetherian ordinary schemes, one has a well-known natural transformation, ${\bf L}^*f^*(-)\overset{\bf L}{\otimes} f^!{\mathcal{O}}_Y\to f^!$, obtained via the projection formula, which extends, using Nagata's compactification, ... More
On Constraint-Based Lambek CalculiAug 15 1995We explore the consequences of layering a Lambek proof system over an arbitrary (constraint) logic. A simple model-theoretic semantics for our hybrid language is provided for which a particularly simple combination of Lambek's and the proof system of ... More
A Group Theoretic Perspective on Unsupervised Deep LearningApr 08 2015Apr 21 2015Why does Deep Learning work? What representations does it capture? How do higher-order representations emerge? We study these questions from the perspective of group theory, thereby opening a new approach towards a theory of Deep learning. One factor ... More
Brain-Swarm Interface (BSI): Controlling a Swarm of Robots with Brain and Eye Signals from an EEG HeadsetDec 24 2016This work presents a novel marriage of Swarm Robotics and Brain Computer Interface technology to produce an interface which connects a user to a swarm of robots. The proposed interface enables the user to control the swarm's size and motion employing ... More
A directed isoperimetric inequality with application to Bregman near neighbor lower boundsApr 04 2014May 16 2015Bregman divergences $D_\phi$ are a class of divergences parametrized by a convex function $\phi$ and include well known distance functions like $\ell_2^2$ and the Kullback-Leibler divergence. There has been extensive research on algorithms for problems ... More
Period-index and u-invariant questions for function fields over complete discretely valued fieldsApr 08 2013Let K be a complete discretely valued field and F the function field of a curve over K. If the characteristic of the residue field k of K is p > 0, then we give a bound for the Brauer p-simension of F in terms of the p-rank of k. If k is a perfect field ... More
D-branes, Exceptional Sheaves and Quivers on Calabi-Yau manifolds: From Mukai to McKayOct 23 2000Nov 06 2000We present a method based on mutations of helices which leads to the construction (in the large volume limit) of exceptional coherent sheaves associated with the $(\sum_al_a=0)$ orbits in Gepner models. This is explicitly verified for a few examples including ... More
A non-commuting twist in the partition functionJan 08 2012We compute a twisted index for an orbifold theory when the twist generating group does not commute with the orbifold group. The twisted index requires the theory to be defined on moduli spaces that are compatible with the twist. This is carried out for ... More
Power to the Points: Validating Data Memberships in ClusteringsMay 21 2013A clustering is an implicit assignment of labels of points, based on proximity to other points. It is these labels that are then used for downstream analysis (either focusing on individual clusters, or identifying representatives of clusters and so on). ... More
Binary Random Sequences Obtained From Decimal SequencesSep 03 2008This paper presents a twist to the generation of binary random sequences by starting with decimal sequences. Rather than representing the prime reciprocal sequence directly in base 2, we first right the prime reciprocal in base 10 and then convert it ... More
Restriction of Laplace-Beltrami eigenfunctions to Cantor-type sets on manifoldsJan 21 2019Given a compact Riemannian manifold $(M, g)$ without boundary, we estimate the Lebesgue norm of Laplace-Beltrami eigenfunctions when restricted to certain fractal subsets $\Gamma$ of $M$. The sets $\Gamma$ that we consider are random and of Cantor-type. ... More
Strong Scarring of Logarithmic QuasimodesJul 30 2015We consider a semiclassical (pseudo)differential operator on a compact surface $(M,g)$, such that the Hamiltonian flow generated by its principal symbol admits a hyperbolic periodic orbit $\gamma$ at some energy $E_0$. For any $\epsilon>0$, we then explicitly ... More
Why does Deep Learning work? - A perspective from Group TheoryDec 20 2014Feb 28 2015Why does Deep Learning work? What representations does it capture? How do higher-order representations emerge? We study these questions from the perspective of group theory, thereby opening a new approach towards a theory of Deep learning. One factor ... More
BKM Lie superalgebras from counting twisted CHL dyons -- IIMay 15 2019We revisit our earlier work which lead to a periodic table of Borcherds-Kac-Moody algebras that appeared in the context of the refined generating function of quarter-BPS (dyons) in $\mathcal{N}=4$ supersymmetric four-dimensional string theory. We make ... More
A LEO-Based Solar-Shade System to Mitigate Global WarmingApr 20 2015The development of a Low-Earth-Orbit (LEO) based solar-shade system, as part of a technically- and financially-viable multipurpose system to provide long-term solutions to global warming and the energy crisis is discussed. The proposed solar-shade and ... More
Failure of the local-global principle for isotropy of quadratic forms over rational function fieldsSep 12 2017We prove the failure of the local-global principle, with respect to all discrete valuations, for isotropy of quadratic forms over a rational function field of transcendence degree at least 2 over the complex numbers. Our construction involves the generalized ... More
Vibration Control Design for Nonlinear Systems using Frequency Response FunctionMar 27 2015A nonlinear frequency response based adaptive vibration controller is proposed for a class of nonlinear mechanical systems. In order to obtain the nonlinear Frequency Response Function (FRF), the convergence properties of the system are studied by using ... More
A proposal for the geometry of W_n gravityMay 23 1994Oct 06 1994We relate the Teichmuller spaces obtained by Hitchin to the Teichmuller spaces of $WA_{n}$-gravity. The relationship of this space to $W$-gravity is obtained by identifying the flat $PSL(n+1,{\BR})$ connections of Hitchin to generalised vielbeins and ... More
Period of the d-Sequence Based Random Number GeneratorDec 03 2007This paper presents an expression to compute the exact period of a recursive random number generator based on d-sequences. Using the multi-recursive version of this generator we can produce large number of pseudorandom sequences.
Observational constraints on variable equation of state parameters of dark matter and dark energy after PlanckJul 24 2012Sep 03 2014In this paper, we study a cosmological model in general relativity within the framework of spatially flat Friedmann-Robertson-Walker space-time filled with ordinary matter (baryonic), radiation, dark matter and dark energy, where the latter two components ... More
Scarring of quasimodes on hyperbolic manifoldsSep 16 2016Let $N$ be a compact hyperbolic manifold, $M\subset N$ an embedded totally geodesic submanifold, and let $-\hbar^2\Delta_{N}$ be the semiclassical Laplace--Beltrami operator. For any $\varepsilon>0$, we explicitly construct families of \emph{quasimodes} ... More
Simulation Study of Two Measures of Integrated InformationJun 29 2017Background: Many authors have proposed Quantitative Theories of Consciousness (QTC) based on theoretical principles like information theory, Granger causality and complexity. Recently, Virmani and Nagaraj (arXiv:1608.08450v2 [cs.IT]) noted the similarity ... 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
Scarring of quasimodes on hyperbolic manifoldsSep 16 2016Apr 05 2017Let $N$ be a compact hyperbolic manifold, $M\subset N$ an embedded totally geodesic submanifold, and let $-\hbar^2\Delta_{N}$ be the semiclassical Laplace--Beltrami operator. For any $\varepsilon>0$, we explicitly construct families of \emph{quasimodes} ... More
Artificial Neural Networks-based Track Fitting of Cosmic Muons through Stacked Resistive Plate ChambersJul 09 2018Sep 29 2018The India-based Neutrino Observatory (INO) collaboration, as part of its detector R\&D program, has developed prototype stacks of resistive plate chambers (RPCs) to study their performance. These stacks have also been used as testbenches for the development ... More
Comment on `Oblique Propagation and Dissipation of Alfvén Waves in Coronal Holes' by Srivastava and DwivediDec 21 2009We comment on the recent paper by Srivastava and Dwivedi (J. Astrophs. Astr. {\bf 28}, 1, 2007). In the said paper the derived dispersion relation $\nu \eta \cos^4 \theta k^4 + [v_A^2 - i \omega (\nu + \eta)] \cos^2 \theta k^2 - \omega^2 = 0$ seems to ... More
Methods of Solving Ill-Posed ProblemsMay 24 2012Many physical problems can be formulated as operator equations of the form Au = f. If these operator equations are ill-posed, we then resort to finding the approximate solutions numerically. Ill-posed problems can be found in the fields of mathematical ... More
A Calogero formulation for four-dimensional black-hole micro statesSep 10 2015We extract the leading-order entropy of a four-dimensional extremal black hole in ${\cal N}{=}2$ ungauged supergravity by formulating the CFT$_1$ that is holographically dual to its near-horizon AdS$_2$ geometry, in terms of a rational Calogero model ... More
Opto-Acoustic Oscillator Using Silicon Mems Optical ModulatorJul 21 2011We show operation of a silicon MEMS based narrow-band optical modulator with large modulation depth by improving the electro-mechanical transducer. We demonstrate an application of the narrowband optical modulator as both the filter and optical modulator ... More
Geometrothermodynamics of BTZ black hole in new massive gravityJun 20 2016We investigate the thermodynamics as well as thermodynamic geometry of chargeless BTZ black hole solution in new massive gravity. Phase structure and thermodynamic stability of the system is analyzed using the Geometrothermodynamic approach. The phase ... More
Probing the interaction between dark matter and dark energy in the presence of massive neutrinosAug 08 2016We consider the possibility of an interaction in the dark sector in the presence of massive neutrinos, and investigate the observational constraints using the most recent CMB anisotropy data in combination with type Ia supernovae, baryon acoustic oscillations, ... More
Equiatomic quaternary Heusler alloys: a material perspective for spintronic applicationsAug 10 2016Half-metallic ferromagnetic (HMF) materials show high spin polarization and are therefore interesting to researchers due to their possible applications in spintronic devices. In these materials, while one spin sub band has a finite density of states at ... More
Correlations among magnetic, magnetocaloric and magneto-transport properties in HoNiSiNov 08 2014Magnetic, magnetocaloric and magneto-transport properties of polycrystalline HoNiSi have been studied. The compound crystallizes in orthorhombic crystal structure and orders antiferromagnetically at TN=4.6 K. Magnetization isotherms show curvature at ... More
Review on magnetic and related properties of RTX compoundsAug 14 2014RTX (R=rare earths, T= 3d/4d/5d, transition metals such as Sc, Ti, Mn, Fe, Co, Ni, Cu, Ru, Rh, Pd, Ag, Os, Ir, Pt, Au, and X=p-block elements such as Al, Ga, In, Si, Ge, Sn, As, Sb, Bi) series is a huge family of intermetallics compounds. These compounds ... More
Embedded Bandits for Large-Scale Black-Box OptimizationNov 27 2016Random embedding has been applied with empirical success to large-scale black-box optimization problems with low effective dimensions. This paper proposes the EmbeddedHunter algorithm, which incorporates the technique in a hierarchical stochastic bandit ... More
Revisiting Norm Optimization for Multi-Objective Black-Box Problems: A Finite-Time AnalysisApr 30 2018May 15 2018The complexity of Pareto fronts imposes a great challenge on the convergence analysis of multi-objective optimization methods. While most theoretical convergence studies have addressed finite-set and/or discrete problems, others have provided probabilistic ... More
A Risk-Sensitive Portfolio Optimization Problem with Fixed Incomes SecuritiesNov 17 2007We discuss a class of risk-sensitive portfolio optimization problems. We consider the portfolio optimization model investigated by Nagai in 2003. The model by its nature can include fixed income securities as well in the portfolio. Under fairly general ... More
BMOBench: Black-Box Multi-Objective Optimization Benchmarking PlatformMay 23 2016This document briefly describes the Black-Box Multi-Objective Optimization Benchmarking (BMOBench) platform. It presents the test problems, evaluation procedure, and experimental setup. To this end, the BMOBench is demonstrated by comparing recent multi-objective ... More
Electrostatic actuation of silicon optomechanical resonatorsJun 14 2010Feb 28 2011Optomechanical systems offer one of the most sensitive methods for detecting mechanical motion using shifts in the optical resonance frequency of the optomechanical resonator . Presently, these systems are used for measuring mechanical thermal noise displacement ... More
Soap-bubble Optimization of GaitsSep 08 2016Oct 26 2016In this paper, we present a geometric variational algorithm for optimizing the gaits of kinematic locomoting systems. The dynamics of this algorithm are analogous to the physics of a soap bubble, with the system's Lie bracket supplying an "inflation pressure" ... More
Thermodynamics and Quasinormal modes of Park black hole in Hořava gravityOct 08 2013We study the quasinormal modes of the massless scalar field of Park black hole in the Ho\v{r}ava gravity using the third order WKB approximation method and found that black hole is stable against these perturbation. We compare and discuss the results ... More