Results for "P. Mitra"

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Sampling Properties of the Spectrum and Coherency of Sequences of Action PotentialsFeb 29 2000The spectrum and coherency are useful quantities for characterizing the temporal correlations and functional relations within and between point processes. This paper begins with a review of these quantities, their interpretation and how they may be estimated. ... More
Axion field induces exact symmetryAug 23 2017While no regularization is consistent with the anomalous chiral symmetry which occurs for massless fermions, the artificial axion-induced symmetry for massive fermions is shown here to be consistent with a standard regularization, even in curved spacetime, ... More
Zeta function regularization, anomaly and complex mass termMar 04 2011Jun 01 2012If the zeta function regularization is used and a complex mass term considered for fermions, the phase does not appear in the fermion determinant. This is not a drawback of the regularization, which can recognize the phase through source terms, as demonstrated ... More
Complex fermion mass term, regularization and CP violationMay 18 2007It is well known that the CP violating theta term of QCD can be converted to a phase in the quark mass term. However, a theory with a complex mass term for quarks can be regularized so as not to violate CP, for example through a zeta function. The contradiction ... More
Hawking temperature from tunnelling formalismNov 24 2006Mar 05 2007It has recently been suggested that the attempt to understand Hawking radiation as tunnelling across black hole horizons produces a Hawking temperature double the standard value. It is explained here how one can obtain the standard value in the same tunnelling ... More
Strong CP: No ProblemApr 07 2005Detailed analysis shows that the phase of a complex mass term of a quark does not violate CP, while the QCD vacuum angle can naturally be set equal to zero. There is no strong CP problem and no need for axions or similar speculative constructions to be ... More
Chiral phase in fermionic measure and the resolution of the strong CP problemApr 23 2001May 08 2001The fermionic measure in the functional integral of a gauge theory suffers from an ambiguity in the form of a chiral phase. By fixing it, one is led once again to the conclusion that a chiral phase in the quark mass term of QCD has no effect and cannot ... More
Entropy of extremal black holes in asymptotically anti-de Sitter spacetimeJul 14 1998Dec 16 1999Unlike the extremal Reissner - Nordstr\"{o}m black hole in ordinary spacetime, the one in anti-de Sitter spacetime is a minimum of action and has zero entropy if quantization is carried out after extremalization. However, if extremalization is carried ... More
Black hole state counting in loop quantum gravityMay 25 2007Jun 26 2009Counting of microscopic states of black holes is discussed within the framework of loop quantum gravity. There are two different ways, one allowing for all spin states and the other involving only pure horizon states. The number of states with a definite ... More
Time-reversal and parity conservation for gravitating quarksMar 03 2009Mar 09 2009The complex mass term of a quark does not violate time-reversal or parity in gravitational interactions, in spite of an axial anomaly.
Thermodynamics of charged anti-de Sitter black holes in canonical ensembleMar 20 1999Dec 16 1999As in the grand canonical treatment of Reissner - Nordstr\"{o}m black holes in anti-de Sitter spacetime, the canonical ensemble formulation also shows that non-extremal black holes tend to have lower action than extremal ones. However, some small non-extremal ... More
Area law for black hole entropy in the SU(2) quantum geometry approachJul 22 2011May 16 2012Black hole thermodynamics suggests that a black hole should have an entropy given by a quarter of the area of its horizon. Earlier calculations in U(1) loop quantum gravity have led to a dominant term proportional to the area, but there was a correction ... More
Entropy of extremal black holesApr 29 1997May 09 1997After summarizing the development of black hole thermodynamics in the seventies, we describe a recent microscopic model. This model suggests that the Bekenstein-Hawking area formula holds for extremal black holes as well as for ordinary (non-extremal) ... More
Black hole entropyFeb 12 2009Mar 09 2009We review black hole entropy with special reference to euclidean quantum gravity, the brick wall approach and loop quantum gravity.
A note on the entropy of charged multi - black - holesAug 05 1999Majumdar--Papapetrou multi--black-hole solutions of the Einstein--Maxwell equations are considered in four and higher dimensions. The Euclidean action with boundary conditions appropriate to the canonical ensemble is shown to lead to zero entropy.
Subtleties of the fermion measure in the presence of axion fieldsFeb 03 2015May 01 2015It is known from path integral studies of the chiral anomaly that the fermion measure has to depend on gauge fields interacting with the fermion. It is pointed out here that in the presence of an axion field interacting with the fermion, it too is involved ... More
Black hole entropy with and without log correction in loop quantum gravityJun 02 2014Earlier calculations of black hole entropy in loop quantum gravity have given a term proportional to the area with a correction involving the logarithm of the area when the area eigenvalue is close to the classical area. However the calculations yield ... More
Theories with global gauge anomalies on the latticeOct 03 2000A global anomaly in a chiral gauge theory manifests itself in different ways in the continuum and on the lattice. In the continuum case, functional integration of the fermion determinant over the whole space of gauge fields yields zero. In the case of ... More
Quantization of Gauge Theories with AnomaliesJun 23 1995In this talk, we briefly review the basic concepts of anomalous gauge theories. It has been known for some time how theories with local anomalies can be handled. Recently it has been pointed out that global anomalies, which obstruct the quantization of ... More
Black hole entropy: departures from area lawMar 23 1995The thermodynamic and euclidean functional integral approaches to black hole entropy are discussed. The existence of some freedom in the definition of the entropy is pointed out and the possibility of a departure from the semiclassical expression discussed ... More
Structure of Multi-Anyon WavefunctionsDec 13 1993Symmetries of multi-anyon wavefunctions are analysed with the help of a second quantized formulation. Analogues of Slater determinants are constructed. It is shown that the Pauli principle is not enforced.
T invariance of Higgs interactions in the standard modelMar 21 2003In the standard model, the Cabibbo-Kobayashi-Maskawa matrix, which incorporates the time-reversal violation shown by the charged current weak interactions, originates from the Higgs-quark interactions. The Yukawa interactions of quarks with the physical ... More
Entropy of near-extremal dyonic black holesDec 30 1997Jan 19 1998In this note it is shown that near-extremal four dimensional dyonic black holes, where the dilaton is not constant, can be described by a microscopic model consisting of a one-dimensional gas of massless particles.
Black Hole EntropyMar 28 1996Apr 04 1996Major developments in the history of the subject are critically reviewed in this talk.
Fermion regularization, fermion measure and axion fieldsFeb 03 2015Dec 20 2016Axion fields were originally introduced to control CP violation due to the theta term in QCD. Pauli-Villars regularization, or the use of a parity symmetric fermion measure, however, preserves CP in the fermion sector. A CP violation arising from the ... More
Understanding CP violation in lattice QCDFeb 20 2001Sep 12 2002It is pointed out that any CP violation which may be found in lattice QCD with a chiral phase in the fermion mass term cannot be relevant for the continuum theory. CP is classically conserved in the corresponding continuum theory and is non-anomalous. ... More
Exclusion statistics and many-particle statesNov 30 1994The thermodynamic distribution function for exclusion statistics is derived. Creation and annihilation operators for particles obeying such statistics are discussed. A connection with anyons is pointed out.
Experimental and numerical investigation of the hydrodynamic characteristics of Autonomous Underwater Vehicles over sea-beds with complex topographyApr 28 2019Improved designs for Autonomous Underwater Vehicles (AUV) are becoming increasingly important due to their utility in academic and industrial applications. However, a majority of such testing and design is carried out under conditions that may not reflect ... More
An analysis of the abstracts presented at the annual meetings of the Society for Neuroscience from 2001 to 2006Oct 12 2007Oct 16 2007We extracted and processed abstract data from the SFN annual meeting abstracts during the period 2001-2006, using techniques and software from natural language processing, database management, and data visualization and analysis. An important first step ... More
A Review of Volatility and Option PricingApr 08 2009The literature on volatility modelling and option pricing is a large and diverse area due to its importance and applications. This paper provides a review of the most significant volatility models and option pricing methods, beginning with constant volatility ... More
Optimisation of Stochastic Programming by Hidden Markov Modelling based Scenario GenerationApr 07 2009This paper formed part of a preliminary research report for a risk consultancy and academic research. Stochastic Programming models provide a powerful paradigm for decision making under uncertainty. In these models the uncertainties are represented by ... More
On a Theorem of Scott and SwarupSep 19 2012Let $1 \rightarrow H \rightarrow G \rightarrow \mathbb{Z} \rightarrow 1$ be an exact sequence of hyperbolic groups induced by a fully irreducible automorphism $\phi$ of the free group $H$. Let $H_1 (\subset H)$ be a finitely generated distorted subgroup ... More
Regime Switching Stochastic Volatility with Perturbation Based Option PricingApr 10 2009Volatility modelling has become a significant area of research within Financial Mathematics. Wiener process driven stochastic volatility models have become popular due their consistency with theoretical arguments and empirical observations. However such ... More
Hawking temperature and higher order calculationsFeb 02 2009Apr 09 2009Hawking radiation has recently been explained by using solutions of wave equations across black hole horizons in a WKB approximation. Higher order calculations using both usual and non-singular coordinates are found to change the solution for zero spin, ... More
Quantum correction to thermodynamical entropy of black holeJun 17 1997The entropy of a black hole can differ from a quarter of the area of the horizon because of quantum corrections. The correction is related to the contribution to the Euclidean functional integral from quantum fluctuations but is not simply equal to the ... More
Entropy of Extremal Black Hole Solutions of String TheorySep 15 1995Sep 29 1995For extremal black holes, the thermodynamic entropy is not proportional to the area. The general form allowed by thermodynamics is worked out for three classes of extremal black hole solutions of string theory and shown to be consistent with the entropy ... More
General form of thermodynamical entropy for black holeAug 31 1994Jun 17 1997The entropy of a black hole can be different from a quarter of the area even at the semiclassical level.
Fermion Scattering off Dilatonic Black HolesMay 02 1994The scattering of massless fermions off magnetically charged dilatonic black holes is reconsidered and a violation of unitarity is found. Even for a single species of fermion it is possible for a particle to disappear into the black hole with its information ... More
Asymptotically non-flat rotating dilaton black holesDec 12 2002Mar 13 2003Dilaton black hole solutions which are neither asymptotically flat nor (anti)-de Sitter but reduce to asymptotically flat solutions in some special limits have been known for a Liouville type dilatonic potential. It is shown how, by solving a pair of ... More
Quantum and classical areas of black hole thermodynamicsJun 23 2015Most calculations of black hole entropy in loop quantum gravity indicate a term proportional to the area eigenvalue A with a correction involving the logarithm of A. This violates the additivity of the entropy. An entropy proportional to A, with a correction ... More
Regularizing tunnelling calculations of Hawking temperatureJul 07 2011Jun 01 2012Attempts to understand Hawking radiation as tunnelling across a black hole horizon require the consideration of singular integrals. Although Schwarzschild coordinates lead to the standard Hawking temperature, isotropic radial coordinates may appear to ... More
A comment on black hole state counting in loop quantum gravityMay 28 2008There are two ways of counting microscopic states of black holes in loop quantum gravity, one counting all allowed spin network labels $j,m$ and the other involving only the labels $m$. Counting states with $|m|=j$, as done in a recent Letter, does not ... More
On the log correction to the black hole area lawJan 16 2004Jul 15 2004Various approaches to black hole entropy yield the area law with logarithmic corrections, many involving a coefficient 1/2, and some involving 3/2. It is pointed out here that the standard quantum geometry formalism is not consistent with 3/2 and favours ... More
Patching up the monopole potentialDec 23 2003It is well known that a vector potential cannot be defined over the whole surface of a sphere around a magnetic monopole. A recent claim to the contrary is shown to have problems. It is explained however that a potential of the proposed type works if ... More
Non-commutative Oscillators and the commutative limitApr 18 2002Apr 24 2002It is shown in first order perturbation theory that anharmonic oscillators in non-commutative space behave smoothly in the commutative limit just as harmonic oscillators do. The non-commutativity provides a method for converting a problem in degenerate ... More
Reply to comment by Zaslavskii on extremal black hole actionApr 20 1998It is shown that Zaslavskii's misunderstanding of our published proof of the irrelevance of all extremal black hole configurations (whether with equal charge and mass or not) rests on his refusal to see the essential difference between the correct inequality ... More
Entropy for extremal Reissner- Nordstrøm black holesNov 17 1994We reinterpret recent work on extremal Reissner- Nordstr\o m black holes to argue that the mass is a measure of the gravitational entropy. We also find that the entropy of scalar fields in this background has a stronger divergence than usual.
Entropy for dilatonic black holeJun 30 1994Jul 07 1994The area formula for entropy is extended to the case of a dilatonic black hole. The entropy of a scalar field in the background of such a black hole is calculated semiclassically. The area and cutoff dependences are normal {\it except in the extremal ... More
SSFN: Self Size-estimating Feed-forward Network and Low Complexity DesignMay 17 2019We design a self size-estimating feed-forward network (SSFN) using a joint optimization approach for estimation of number of layers, number of nodes and learning of weight matrices at a low computational complexity. In the proposed approach, SSFN grows ... More
Fast Convergence for Stochastic and Distributed Gradient Descent in the Interpolation LimitMar 08 2018May 29 2018Modern supervised learning techniques, particularly those using deep nets, involve fitting high dimensional labelled data sets with functions containing very large numbers of parameters. Much of this work is empirical. Interesting phenomena have been ... More
An improved estimate of black hole entropy in the quantum geometry approachNov 08 2004May 30 2005A proper counting of states for black holes in the quantum geometry approach shows that the dominant configuration for spins are distributions that include spins exceeding one-half at the punctures. This raises the value of the Immirzi parameter and the ... More
Counting black hole microscopic states in loop quantum gravityMay 12 2006Sep 12 2006Counting of microscopic states of black holes is performed within the framework of loop quantum gravity. This is the first calculation of the pure horizon states using statistical methods, which reveals the possibility of additional states missed in the ... More
Understanding the area proposal for extremal black hole entropyAug 30 1996Jan 15 1997Whereas the usual understanding is that the entropy of only a non-extremal black hole is given by the area of the horizon, there are derivations of an area law for extremal black holes in some model calculations. It is explained here how such results ... More
Temperatures of extremal black holesJul 14 1995The temperature of an extremal Reissner - Nordstrom black hole is not restricted by the requirement of absence of a conical singularity. It is demonstrated how Kruskal-like coordinates may be constructed corresponding to any temperature whatsoever. A ... More
The helicity constraint in spherical shell dynamosNov 22 2007The motivation for considering distributed large scale dynamos in the solar context is reviewed in connection with the magnetic helicity constraint. Preliminary accounts of 3-dimensional direct numerical simulations (in spherical shell segments) and simulations ... More
Multimodal Cross-registration and Quantification of Metric Distortions in Whole Brain Histology of Marmoset using Diffeomorphic MappingsMay 14 2018Apr 17 2019Whole brain neuroanatomy using tera-voxel light-microscopic data sets is of much current interest. A fundamental problem in this field is the mapping of individual brain data sets to a reference space. Previous work has not rigorously quantified the distortions ... More
Absence of log correction in entropy of large black holesJun 15 2012May 16 2014Earlier calculations of black hole entropy in loop quantum gravity led to a dominant term proportional to the area, but there was a correction involving the logarithm of the area, the Chern-Simons level being assumed to be large. We find that the calculations ... More
Counting of Black Hole MicrostatesMar 09 2006May 15 2006The entropy of a black hole can be obtained by counting states in loop quantum gravity. The dominant term depends on the Immirzi parameter involved in the quantization and is proportional to the area of the horizon, while there is a logarithmic correction ... More
Fine-grained state counting for black holes in loop quantum gravitySep 24 2008Mar 13 2009A state of a black hole in loop quantum gravity is given by a distribution of spins on punctures on the horizon. The distribution is of the Boltzmann type, with the area playing the role of the energy. In investigations where the total area was kept approximately ... More
Entropy of Extremal Dyonic Black HolesFeb 12 1996Aug 02 1996For extremal charged black holes, the thermodynamic entropy is proportional not to the area but to the mass or charges. This is demonstrated here for dyonic extremal black hole solutions of string theory. It is pointed out that these solutions have zero ... More
Black hole state counting in loop quantum gravityMay 26 2011The two ways of counting microscopic states of black holes in the U(1) formulation of loop quantum gravity, one counting all allowed spin network labels j,m and the other only m labels, are discussed in some detail. The constraints on m are clarified ... More
Bending a slab of neural tissueOct 17 2005Nov 08 2006In comparative and developmental neuroanatomy one encounters questions regarding the deformation of neural tissue under stress. The motivation of this note is an observation (Barbas {\it et al}) that at cortical folds or gyri, the layers of neural tissue ... More
Doubly-charged Higgs Boson at Future Electron-Proton ColliderMar 04 2019We explore the discovery prospect of the doubly-charged component of an $SU(2)_L$-triplet scalar at the future $e^- p$ collider FCC-eh, proposed to operate with an electron beam energy of 60 GeV and a proton beam energy of 50 TeV. We consider the associated ... More
Idl Signal Processing Library 1.0Jan 20 1998We make available a library of documented IDL .pro files as well as a shareable object library that allows IDL to call routines from LAPACK. The routines are for use in the spectral analysis of time series data. The primary focus of these routines are ... More
Analysis of Dynamic Brain Imaging DataApr 20 1998Modern imaging techniques for probing brain function, including functional Magnetic Resonance Imaging, intrinsic and extrinsic contrast optical imaging, and magnetoencephalography, generate large data sets with complex content. In this paper we develop ... More
Marker Genes for Anatomical Regions in the Brain: Insights from the Allen Gene Expression AtlasMay 06 2011Quantitative criteria are proposed to identify genes (and sets of genes) whose expression marks a specific brain region (or a set of brain regions). Gene-expression energies, obtained for thousands of mouse genes by numerization of in-situ hybridization ... More
Impact of Building-Level Motor Protection on Power System Transient BehaviorsJun 19 2018Protection strategies for transmission and distribution systems have been extensively investigated to facilitate better coordination of physical protection devices. A diverse range of functional motors with dedicated protection schemes are being used ... More
Summarizing Event Sequences with Serial Episodes: A Statistical Model and an ApplicationApr 01 2019In this paper we address the problem of discovering a small set of frequent serial episodes from sequential data so as to adequately characterize or summarize the data. We discuss an algorithm based on the Minimum Description Length (MDL) principle and ... More
Polarization-tailored Fano interference in plasmonic crystals: A Mueller matrix model of anisotropic Fano resonanceSep 19 2016We present a simple yet elegant Mueller matrix approach for controlling the Fano interference effect and engineering the resulting asymmetric spectral line shape in anisotropic optical system. The approach is founded on a generalized model of anisotropic ... More
Computational neuroanatomy and gene expression: optimal sets of marker genes for brain regionsMay 11 2012The three-dimensional data-driven Allen Gene Expression Atlas of the adult mouse brain consists of numerized in-situ hybridization data for thousands of genes, co-registered to the Allen Reference Atlas. We propose quantitative criteria to rank genes ... More
Statistical analysis of co-expression properties of sets of genes in the mouse brainNov 26 2011Dec 11 2011We propose a quantitative method to estimate the statistical properties of sets of genes for which expression data are available and co-registered to a reference atlas of the brain. It is based on graph-theoretic properties of co-expression coefficients ... More
Algorithmic choice of coordinates for injections into the brain: encoding a neuroanatomical atlas on a gridApr 13 2011Given an atlas of the brain and a number of injections to be performed in order to map out the connections between parts of the brain, we propose an algorithm to compute the coordinates of the injections. The algorithm is designed to sample the brain ... More
Orbital ordering in undoped manganites using Jahn-Teller interactionOct 15 2003To understand the orbital ordering of $LaMnO_3$ in the ground state, we study it in the A-type spin antiferromagnetic state. We calculate the two-dimensional response functions associated with the Jahn-Teller $Q_2$ and $Q_3$ distortions and find that ... More
One Loop Calculation of Cosmological Constant in a Scale Invariant TheoryFeb 15 2009We compute the cosmological constant in a scale invariant scalar field theory. The gravitational action is also suitably modified to respect scale invariance. Due to scale invariance the theory does not admit a cosmological constant term. The scale invariance ... More
Cosmological Symmetry Breaking, Pseudo-scale invariance, Dark Energy and the Standard ModelApr 18 2007Jun 22 2007The energy density of the universe today may be dominated by the vacuum energy of a slowly rolling scalar field. Making a quantum expansion around such a time dependent solution is found to break fundamental symmetries of quantum field theory. We call ... More
Distributions of Singular Values for Some Random MatricesSep 25 1997The Singular Value Decomposition is a matrix decomposition technique widely used in the analysis of multivariate data, such as complex space-time images obtained in both physical and biological systems. In this paper, we examine the distribution of Singular ... More
Polaronic Heat Capacity in The Anderson - Hasegawa ModelJan 16 2003An exact treatment of the Anderson - Hasegawa two - site model, incorporating the presence of superexchange and polarons, is used to compute the heat capacity. The calculated results point to the dominance of the lattice contribution, especially in the ... More
Tunnelling from black holes and tunnelling into white holesApr 13 2007Feb 20 2008Hawking radiation is nowadays being understood as tunnelling through black hole horizons. Here, the extension of the Hamilton-Jacobi approach to tunnelling for non-rotating and rotating black holes in different non-singular coordinate systems not only ... More
A Generalized Gauge Invariant Regularization of the Schwinger ModelOct 21 1993The Schwinger model is studied with a new one - parameter class of gauge invariant regularizations that generalizes the usual point - splitting or Fujikawa schemes. The spectrum is found to be qualitatively unchanged, except for a limiting value of the ... More
T-Dependent Dyson- Schwinger Equation In IR Regime Of QCD: The Critical PointMar 14 2004Aug 23 2004The quark mass function $\Sigma(p)$ in QCD is revisited, using a gluon propagator in the form $1/(k^2 + m_g^2)$ plus $2\mu^2/ (k^2 + m_g^2)^2$, where the second (IR) term gives linear confinement for $m_g = 0$ in the instantaneous limit, $\mu$ being another ... More
Localization and the Anomalous Hall Effect in a "Dirty" Metallic FerromagnetAug 15 2008Jun 15 2010We report magnetoresistance measurements over an extensive temperature range (0.1 K $\leq T \leq$ 100 K) in a disordered ferromagnetic semiconductor (\gma). The study focuses on a series of metallic \gma~ epilayers that lie in the vicinity of the metal-insulator ... More
Quantum Treatment of the Anderson-Hasegawa Model -- Effects of Superexchange and PolaronsApr 17 2002We revisit the Anderson-Hasegawa double-exchange model and critically examine its exact solution when the core spins are treated quantum mechanically.We show that the quantum effects, in the presence of an additional superexchange interaction between ... More
Is there still a strong CP problem?Dec 21 2000Sep 16 2003The role of a chiral U(1) phase in the quark mass in QCD is analysed from first principles. In operator formulation, there is a parity symmetry and the phase can be removed by a change in the representation of the Dirac gamma matrices. Moreover, these ... More
Understanding Far-Infrared Absorption in the S=1 Antiferromagnetic Chain Compound NENPSep 17 1993Infrared transmission measurements on the $S=1$ antiferromagnetic chain compound NENP in applied magnetic fields show a sharp absorption line at the field-shifted Haldane gap. This violates a wave-vector selection rule of the Hamiltonian normally used ... More
Filling factors and scale heights of the DIG in the Milky WayNov 07 2005The combination of dispersion measures of pulsars, distances from the model of Cordes and Lazio (2002) and emission measures from the WHAM survey enabled a statistical study of electron densities and filling factors of the diffuse ionized gas (DIG) in ... More
Just In Time IndexingAug 16 2013One of the major challenges being faced by Database managers today is to manage the performance of complex SQL queries which are dynamic in nature. Since it is not possible to tune each and every query because of its dynamic nature, there is a definite ... More
Computational neuroanatomy and co-expression of genes in the adult mouse brain, analysis tools for the Allen Brain AtlasJan 09 2013We review quantitative methods and software developed to analyze genome-scale, brain-wide spatially-mapped gene-expression data. We expose new methods based on the underlying high-dimensional geometry of voxel space and gene space, and on simulations ... More
Nonlinear limits to the information capacity of optical fiber communicationsNov 07 2000The exponential growth in the rate at which information can be communicated through an optical fiber is a key element in the so called information revolution. However, like all exponential growth laws, there are physical limits to be considered. The nonlinear ... More
Temperature Dependence of Gluon and Quark Condensates as from Linear ConfinementSep 28 2001Jan 08 2002The gluon and quark condensates and their temperature dependence are investigated within QCD premises. The input for the former is a gauge invariant $gg$ kernel made up of the direct (D), exchange (X) and contact(C) QCD interactions in the lowest order, ... More
Cell-type-specific microarray data and the Allen atlas: quantitative analysis of brain-wide patterns of correlation and densityFeb 28 2013Oct 12 2013The Allen Atlas of the adult mouse brain is used to estimate the region-specificity of 64 cell types whose transcriptional profile in the mouse brain has been measured in microarray experiments. We systematically analyze the preliminary results presented ... More
Statistical Entropy of Schwarzschild Black Strings and Black HolesMay 11 2000The statistical entropy of a Schwarzschild black string in five dimensions is obtained by counting the black string states which form a representation of the near-horizon conformal symmetry with a central charge. The statistical entropy of the string ... More
Multidimensional Isotropic and Anisotropic Q-Oscillator ModelsNov 13 1995q-oscillator models are considered in two and higher dimensions and their symmetries are explored. New symmetries are found for both isotropic and anisotropic cases. Applications to the spectra of triatomic molecules and superdeformed nuclei are discussed. ... More
Direct observation of electron doping in La0.7Ce0.3MnO3 using x-ray absorption spectroscopyJun 10 2002Aug 19 2002We report on a X-ray absorption spectroscopic (XAS) study on a thin film of La0.7Ce0.3MnO3, a manganite which was previously only speculated to be an electron doped system. The measurements clearly show that the cerium is in the Ce(IV) valence state and ... More
Modeling total expenditure on warranty claimsAug 05 2010We approximate the distribution of total expenditure of a retail company over warranty claims incurred in a fixed period [0, T], say the following quarter. We consider two kinds of warranty policies, namely, the non-renewing free replacement warranty ... More
Modeling Multiple Risks: Hidden Domain of AttractionOct 04 2011Hidden regular variation is a sub-model of multivariate regular variation and facilitates accurate estimation of joint tail probabilities. We generalize the model of hidden regular variation to what we call hidden domain of attraction. We exhibit examples ... More
Understanding the Effect of Uniaxial Tensile Strain on the Early Stages of Sensitization in AISI 304 Austenitic Stainless SteelMar 07 2014In the present study, an attempt has been made to understand the effect of different competing mechanisms controlling the overall degree of sensitization (DOS) of deformed austenitic stainless steel at the early stage of sensitization. The Double Loop ... More
Safe and Stabilizing Distributed Multi-Path Cellular FlowsSep 10 2012Oct 11 2012We study the problem of distributed traffic control in the partitioned plane, where the movement of all entities (robots, vehicles, etc.) within each partition (cell) is coupled. Establishing liveness in such systems is challenging, but such analysis ... More
Status of the Lunar Detection Mode for Cosmic Particles of LOFARMar 20 2019Cosmic particles hitting Earth's moon produce radio emission via the Askaryan effect. If the resulting radio ns-pulse can be detected by radio telescopes, this technique potentially increases the available collective area for ZeV scale particles by several ... More
Cosmic Ray Physics with the LOFAR Radio TelescopeMar 20 2019The LOFAR radio telescope is able to measure the radio emission from cosmic ray induced air showers with hundreds of individual antennas. This allows for precision testing of the emission mechanisms for the radio signal as well as determination of the ... More
Weak localization correction to the anomalous Hall effect in polycrystalline Fe filmsJun 08 2006May 22 2007In situ transport measurements have been made on ultrathin ($<$100 {\AA} thick) polycrystalline Fe films as a function of temperature and magnetic field for a wide range of disorder strengths. For sheet resistances $R_{xx}$ less than $\sim 3k\Omega$, ... More