Results for "Mayuresh P. Surnis"

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Radio Pulsation Search and Imaging Study of SGR J1935+2154May 26 2016We present the results obtained from imaging observations, and search for radio pulsations towards the magnetar SGR J1935+2154 made using the Giant Metrewave Radio Telescope, and the Ooty Radio Telescope. We present the high resolution radio image of ... More
GMRT Galactic Plane Pulsar and Transient Survey and the Discovery of PSR J1838+1523May 14 2018We report the results of a blind pulsar survey carried out with the Giant Metrewave Radio Telescope (GMRT) at 325 MHz. The survey covered about 10\% of the region between Galactic longitude 45$^{\circ} < l <$ 135$^{\circ}$ and Galactic latitude 1$^{\circ} ... More
Follow-up Timing of Three GMRT PulsarsNov 07 2018We report on the results of multi-frequency follow-up observations of three pulsars (PSRs J0026+6320, J2208+5500 and J2217+5733) discovered with the Giant Metrewave Radio Telescope (GMRT). These observations were carried out with the GMRT and the Ooty ... More
ALFABURST: A commensal search for Fast Radio Bursts with AreciboOct 30 2017Nov 22 2017ALFABURST has been searching for Fast Radio Bursts (FRBs) commensally with other projects using the Arecibo L-band Feed Array (ALFA) receiver at the Arecibo Observatory since July 2015. We describe the observing system and report on the non-detection ... More
Verifying and Reporting Fast Radio BurstsAug 23 2018Fast Radio Bursts (FRBs) are a class of short-duration transients at radio wavelengths with inferred astrophysical origin. The prototypical FRB is a broadband signal that occurs over the extent of the receiver frequency range, is narrow in time, and is ... More
Twelve Decades: Probing the Interstellar Medium from kiloparsec to sub-AU scalesMar 18 2019After a decade of great progress in understanding gas flow into, out of, and through the Milky Way, we are poised to merge observations with simulations to build a comprehensive picture of the multi-scale magnetized interstellar medium (ISM). These insights ... More
GREENBURST: a commensal fast radio burst search back-end for the Green Bank TelescopeMar 13 2019We describe the design and deployment of GREENBURST, a commensal Fast Radio Burst (FRB) search system at the Green Bank Telescope. GREENBURST uses the dedicated L-band receiver tap to search over the 960$-$1920 MHz frequency range for pulses with dispersion ... More
Initial Results from the ALFABURST SurveyOct 25 2017Here, we present initial results from the ALFABURST radio transient survey, which is currently running in a commensal mode with the ALFA receiver at the Arecibo telescope. We observed for a total of 1400 hours and have detected single pulses from known ... More
Discovery of an Intermittent Pulsar: PSR J1839+15Oct 14 2012Oct 16 2012We report the discovery of a new pulsar PSR J1839+15, having a period of 549 ms and a DM of 68 pc-cm^-3. We also present its timing solution and report the intermittent behaviour of its radio emission.
A hadronic scenario for HESS J1818-154Sep 24 2013Aims: G15.4+0.1 is a faint supernova remnant (SNR) that has recently been associated with the gamma-ray source HESS J1818-154. We investigate a hadronic scenario for the production of the gamma-ray emission. Methods: Molecular 13CO (J=1-0) taken from ... More
A complete radio study of SNR G15.4+0.1 from new GMRT observationsFeb 04 2015The supernova remnant G15.4+0.1 is considered to be the possible counterpart of the gamma-ray source HESSJ1818-154. With the goal of getting a complete view of this remnant and understanding the nature of the gamma-ray flux, we conducted a detailed radio ... More
Prospect for UV observations from the Moon. III. Assembly and ground calibration of Lunar Ultraviolet Cosmic Imager (LUCI)Mar 18 2019Mar 19 2019The Lunar Ultraviolet Cosmic Imager (LUCI) is a near-ultraviolet (NUV) telescope with all-spherical mirrors, designed and built to fly as a scientific payload on a lunar mission with Team Indus - the original Indian entry to the Google Lunar X-Prize. ... More
A Raspberry Pi-Based Attitude SensorDec 19 2014We have developed a lightweight low-cost attitude sensor, based on a Raspberry Pi, built with readily available commercial components. It can be used in experiments where weight and power are constrained, such as in high- altitude lightweight balloon ... More
On Frequency-Dependent Dispersion Measures and the Extreme Scattering Events Toward PSR J2219+4754Mar 01 2019Context. Variations in pulsar dispersion measures have been observed since shortly after the discovery of pulsars. As early as 2006, frequency-dependent dispersion measures have been observed and attributed to several possible causes. Cordes et al. (2016) ... More
Design and modeling of a tunable spatial heterodyne spectrometer for emission line studiesApr 25 2018Apr 26 2018Spatial Heterodyne Spectroscopy (SHS) is a relatively novel interferometric technique similar to the Fourier transform spectroscopy with heritage from the Michelson Interferometer. An imaging detector is used at the output of a SHS to record the spatially-heterodyned ... More
An Overview of High-Altitude Balloon Experiments at the Indian Institute of AstrophysicsJun 04 2015Sep 03 2015We have initiated the High-Altitude Ballooning programme at Indian Institute of Astrophysics, Bangalore, in the year 2011 with the primary purpose of developing and flying low-cost scientific payloads on a balloon-borne platform. The main aim is the observations ... More
Prospect for UV observations from the Moon. III. Assembly and ground calibration of Lunar Ultraviolet Cosmic Imager (LUCI)Mar 18 2019The Lunar Ultraviolet Cosmic Imager (LUCI) is a near-ultraviolet (NUV) telescope with all-spherical mirrors, designed and built to fly as a scientific payload on a lunar mission with Team Indus - the original Indian entry to the Google Lunar X-Prize. ... More
Stabilization Theory for Active Multi Port NetworksJun 10 2016This paper proposes a theory for designing stable interconnection of linear active multi-port networks at the ports. Such interconnections can lead to unstable networks even if the original networks are stable with respect to bounded port excitations. ... More
Measurements of gondola motion on a stratospheric balloon flightJul 21 2016Balloon experiments are an economically feasible method of conducting observations in astronomy that are not possible from the ground. The astronomical payload may include a telescope, a detector, and a pointing/stabilization system. Determining the attitude ... More
Fingering instability of a suspension film spreading on a spinning diskJun 09 2016The spreading of a thin film of suspension on a spinning disk and the accompanying contact line instability is studied through flow visualization experiments. The critical radius for the onset of instability shows an increase with increase in the particle ... More
A generic FPGA-based detector readout and real-time image processing boardAug 26 2016For space-based astronomical observations, it is important to have a mechanism to capture the digital output from the standard detector for further on-board analysis and storage. We have developed a generic (application- wise) field-programmable gate ... More
ROBUS: Fair Cache Allocation for Multi-tenant Data-parallel WorkloadsApr 25 2015Sep 03 2015Systems for processing big data---e.g., Hadoop, Spark, and massively parallel databases---need to run workloads on behalf of multiple tenants simultaneously. The abundant disk-based storage in these systems is usually complemented by a smaller, but much ... More
An Ultraviolet imager to study bright UV sourcesAug 23 2016We have designed and developed a compact ultraviolet imaging payload to fly on a range of possible platforms such as high altitude balloon experiments, cubesats, space missions, etc. The primary science goals are to study the bright UV sources (mag < ... More
Prospect for UV observations from the Moon. II. Instrumental Design of an Ultraviolet Imager LUCIOct 07 2016We present a design for a near-ultraviolet (NUV) imaging instrument which may be flown on a range of available platforms, including high-altitude balloons, nanosatellites, or space missions. Although all current UV space missions adopt a Ritchey-Chretain ... More
Correcting differences in multi-site neuroimaging data using Generative Adversarial NetworksMar 26 2018Apr 12 2018Magnetic Resonance Imaging (MRI) of the brain has been used to investigate a wide range of neurological disorders, but data acquisition can be expensive, time-consuming, and inconvenient. Multi-site studies present a valuable opportunity to advance research ... More
Wide-field Ultraviolet Imager for Astronomical Transient StudiesJan 31 2018Though the ultraviolet (UV) domain plays a vital role in the studies of astronomical transient events, the UV time-domain sky remains largely unexplored. We have designed a wide-field UV imager that can be flown on a range of available platforms, such ... More
A software package for evaluating the performance of a star sensor operationAug 27 2016We have developed a low-cost off-the-shelf component star sensor (StarSense) for use in minisatellites and CubeSats to determine the attitude of a satellite in orbit. StarSense is an imaging camera with a limiting magnitude of 6.5, which extracts information ... More
Prospect for UV observations from the Moon. II. Instrumental Design of an Ultraviolet Imager LUCIOct 07 2016Nov 08 2016We present a design for a near-ultraviolet (NUV) imaging instrument which may be flown on a range of available platforms, including high-altitude balloons, nanosatellites, or space missions. Although all current UV space missions adopt a Ritchey-Chretain ... More
Noise modeling and analysis of an IMU-based attitude sensor: improvement of performance by filtering and sensor fusionAug 25 2016We describe the characterization and removal of noise present in the Inertial Measurement Unit (IMU) MPU-6050. This IMU was initially used in an attitude sensor (AS) developed in-house, and subsequently implemented in a pointing and stabilization platform ... More
Pointing System for the Balloon-Borne Astronomical PayloadsSep 01 2016We describe the development and implementation of a light-weight, fully autonomous 2-axis pointing and stabilization system designed for balloon-borne astronomical payloads. The system is developed using off-the-shelf components such as Arduino Uno controller, ... More
Balloon UV Experiments for Astronomical and Atmospheric ObservationsAug 23 2016The ultraviolet (UV) window has been largely unexplored through balloons for astronomy. We discuss here the development of a compact near-UV spectrograph with fiber optics input for balloon ights. It is a modified Czerny-Turner system built using off-the-shelf ... More
Charge multiplets and masses for E(11)May 28 2008Oct 30 2008The particle, string and membrane charge multiplets are derived in detail from the decomposition of the l1 (charge) representation of E(11) in three, four, five, six, seven and eight spacetime dimensions. A tension formula relating weights of the l1 (charge) ... More
Vacuum energy sequestering and cosmic dynamicsOct 16 2014We explicitly compute the dynamics of closed homogeneous and isotropic universes permeated by a single perfect fluid with a constant equation of state parameter $w$ in the context of a recent reformulation of general relativity, proposed in [1], which ... More
On the cosmological evolution of alpha and mu and the dynamics of dark energyApr 22 2008We study the cosmological evolution of the fine structure constant, $\alpha$, and the proton-to-electron mass ratio, $\mu=m_p/m_e$, in the context of a generic class of models where the gauge kinetic function is a linear function of a quintessence-type ... More
Interacting dark energy: the role of microscopic feedback in the dark sectorFeb 09 2015Mar 10 2015We investigate the impact on the classical dynamics of dark matter particles and dark energy of a non-minimal coupling in the dark sector, assuming that the mass of the dark matter particles is coupled to a dark energy scalar field. We show that standard ... More
In medium T matrix for neutron matterApr 03 2002Jun 18 2002We calculate the equation of state of pure neutron matter, comparing the G-matrix calculation with the in-medium T-matrix result. At low densities, we obtain similar energies per nucleon, however some differences appear at higher densities. We use the ... More
Energy dependence of transverse quark flow in heavy ion collisionsJul 19 2004Energy dependence of quark transverse flow carries information about dynamical properties (equation of state, initial conditions) of deconfined matter produced in heavy ion collisions. We assume quark-antiquark matter formation in Pb+Pb collisions at ... More
D and J/psi production from deconfined matter in relativistic heavy ion collisionsAug 18 2000We study the production of the D and J/psi mesons from deconfined quark matter at CERN SPS energy. Using the MICOR microscopical coalescence model we determine the transverse momentum spectra of these charm mesons. We predict the slopes of their transverse ... More
Molecular Dipolar Crystals as High Fidelity Quantum Memory for Hybrid Quantum ComputingJun 20 2007We study collective excitations of rotational and spin states of an ensemble of polar molecules, which are prepared in a dipolar crystalline phase, as a candidate for a high fidelity quantum memory. While dipolar crystals are formed in the high density ... More
Single- and Two-Component GRB Spectra in the Fermi GBM-LAT Energy RangeFeb 13 2012Jun 04 2012Most Fermi GRB spectra appear as either a broken power law extending to GeV energies or as a broken power with a separate GeV power law component. Here we show that such spectra can be understood in terms of magnetically dominated relativistic jets where ... More
Impact of nuclear effects on the extraction of neutrino oscillation parametersJul 04 2013Dec 03 2013We study the possible impact of nuclear effects and final state interactions on the determination of the oscillation parameters due to mis-reconstruction of non-quasi-elastic events as quasi-elastic events at low energies. We analyze a $\nu_\mu$ disappearance ... More
Interlayer Exchange Coupling in (Ga,Mn)As-based SuperlatticesFeb 14 2005The interlayer coupling between (Ga,Mn)As ferromagnetic layers in all-semiconductor superlattices is studied theoretically within a tight-binding model, which takes into account the crystal, band and magnetic structure of the constituent superlattice ... More
Successive Injection of Opposite Magnetic Helicity in Solar Active Region NOAA 11928Nov 02 2016Understanding the nature and evolution of the photospheric helicity flux transfer is a key to reveal the role of magnetic helicity in coronal dynamics of solar active regions. Using SDO/HMI photospheric vector magnetograms and the derived flow velocity ... More
Multiple partitions, lattice paths and a Burge-Bressoud-type correspondenceAug 31 2006Jan 15 2008A bijection is presented between (1): partitions with conditions $f_j+f_{j+1}\leq k-1$ and $ f_1\leq i-1$, where $f_j$ is the frequency of the part $j$ in the partition, and (2): sets of $k-1$ ordered partitions $(n^{(1)}, n^{(2)}, ..., n^{(k-1)})$ such ... More
The limiting behavior of the Liu-Yau quasi-local energyJun 07 2007The small- and large-sphere limits of the quasi-local energy recently proposed by Liu and Yau are carefully examined. It is shown that in the small-sphere limit, the non-vacuum limit of the Liu-Yau quasi-local energy approaches the expected value \frac{4\pi}{3} ... More
New path description for the M(k+1,2k+3) models and the dual Z_k graded parafermionsSep 11 2007May 28 2008We present a new path description for the states of the non-unitary M(k+1,2k+3) models. This description differs from the one induced by the Forrester-Baxter solution, in terms of configuration sums, of their restricted-solid-on-solid model. The proposed ... More
A quasi-particle description of the M(3,p) modelsJun 09 2005Oct 07 2005The M(3,p) minimal models are reconsidered from the point of view of the extended algebra whose generators are the energy-momentum tensor and the primary field \phi_{2,1} of dimension $(p-2)/4$. Within this framework, we provide a quasi-particle description ... More
Jagged partitions and lattice pathsMay 19 2006A lattice-path description of $K$-restricted jagged partitions is presented. The corresponding lattice paths can have peaks only at even $x$ coordinate and the maximal value of the height cannot be larger than $K-1$. Its weight is twice that of the corresponding ... More
Parafermionic derivation of Andrews-type multiple sumsMay 11 2005A multi-parafermion basis of states for the Z_k parafermionic models is derived. Its generating function is constructed by elementary steps. It corresponds to the Andrews multiple-sum which enumerates partitions whose parts separated by the distance k-1 ... More
Parafermionic character formulaeJun 29 2000We study various aspects of parafermionic theories such as the precise field content, a description of a basis of states (that is, the counting of independent states in a freely generated highest-weight module) and the explicit expression of the parafermionic ... More
Point interaction in dimension two and three as models of small scatterersJul 03 1996In addition to the conventional renormalized--coupling--constant picture, point interactions in dimension two and three are shown to model within a suitable energy range scattering on localized potentials, both attractive and repulsive.
Enhancement of Tc by Sr substitution for Ba in Hg-2212 superconductorApr 16 2003Sep 23 2003The Ba substitution by Sr has been studied in two Hg-2212 series: Hg2(Ba(1-y)Sr(y))2YCu2O8-d and Hg2(Ba(1-y)Sr(y))2(Y0.80Ca0.20)Cu2O8-d. In both series a Tc enhancement of about 40 K is observed when Sr substitutes Ba from y = 0 to y = 1.0. The y = 0 ... More
Characteristic Relations for Quantum MatricesFeb 20 1995Feb 24 1995General algebraic properties of the algebras of vector fields over quantum linear groups $GL_q(N)$ and $SL_q(N)$ are studied. These quantum algebras appears to be quite similar to the classical matrix algebra. In particular, quantum analogues of the characteristic ... More
A new approach to the connection problem for local solutions to the general Heun equationJun 28 2016Jul 03 2016We present new solution of the the connection problem for local solutions to the general Heun equation. Our approach is based on the symmetric form of the Heun's differential equation \cite{Fiziev14,Fiziev16} with four different regular singular points ... More
Inner Structure of Black Holes in Eddington-inspired Born-Infeld gravity: the role of mass inflationNov 10 2015We investigate the interior dynamics of accreting black holes in Eddington-inspired Born-Infeld gravity using the homogeneous approximation and taking charge as a surrogate for angular momentum, showing that accretion can have an enormous impact on their ... More
Primordial black hole constraints on non-gaussian inflation modelsOct 03 2005We determine the abundance of primordial black holes (PBHs) formed in the context of non-gaussian models with primordial density perturbations. We consider models with a renormalized $\chi^2$ probability distribution function parametrized by the number, ... More
Eddington-inspired Born-Infeld gravity: nuclear physics constraints and the validity of the continuous fluid approximationJul 19 2012In this paper we investigate the classical non-relativistic limit of the Eddington-inspired Born-Infeld theory of gravity. We show that strong bounds on the value of the only additional parameter of the theory \kappa, with respect to general relativity, ... More
Efficiency of the coherent biexciton admixture mechanism for multiple exciton generation in InAs nanocrystalsJun 23 2015We study the coherent mixing between two-particle (single exciton) and four-particle (biexciton) states of a semiconductor nanocrystal resulting from the coulomb coupling between states with different numbers of electron-hole pairs. Using a simple model ... More
Thermodynamic consistency for nuclear matter calculationsFeb 10 2001We investigate the relation between the binding energy and the Fermi energy and between different expressions for the pressure in cold nuclear matter. For a self-consistent calculation based on a $\Phi$ derivable $T-$matrix approximation with off-shell ... More
Laser probing of atomic Cooper pairsJan 24 2000We consider a gas of attractively interacting cold Fermionic atoms which are manipulated by laser light. The laser induces a transition from an internal state with large negative scattering length to one with almost no interactions. The process can be ... More
On the electron-energy loss spectra and plasmon resonance in cupratesMar 18 1999The consequences of the non-Drude charge response in the normal state of cuprates and the effect of the layered structure on electron-energy loss spectra are investigated, both for experiments in the transmission and the reflection mode. It is shown that ... More
Phase boundary and finite temperature crossovers of the quantum Ising model in two dimensionsJun 07 2009We revisit the two-dimensional quantum Ising model by computing renormalization group flows close to its quantum critical point. The low but finite temperature regime in the vicinity of the quantum critical point is squashed between two distinct non-Gaussian ... More
The contraction of $SU_μ(2)$ and its differential structures to $E_κ(2)$Jul 02 1998The deformed double covering of E(2) group, denoted by $\tilde{E}_\kappa(2)$, is obtained by contraction from the $SU_\mu(2)$. The contraction procedure is then used for producing a new examples of differential calculi: 3D-left covariant calculus on both ... More
Depurification by Lorentz boostsOct 23 2003We consider a particle of half-integer spin which is nonrelativistic in the rest frame. Assuming the particle is completely polarized along third axis we calculate the Bloch vector as seen by a moving observer. The result for its length is expressed in ... More
Deformed Galilei symmetryNov 24 1998A particular deformation of central extended Galilei group is considered. It is shown that the deformation influences the rules of constructing the composed systems while one particle states remain basically unaffected. In particular the mass appeared ... More
Probing gravity at sub-femtometer scales through the pressure distribution inside the protonFeb 04 2019Recently, a measurement of the pressure distribution experienced by the quarks inside the proton has found a strong repulsive (positive) pressure at distances up to 0.6 femtometers from its center and a (negative) confining pressure at larger distances. ... More
Computing higher rank primitive root densitiesMar 20 2012Dec 29 2013We extend the character sum method for the computation of densities in Artin primitive root problems developed by H. W. Lenstra and the authors to the situation of radical extensions of arbitrary rank. Our algebraic set-up identifies the key parameters ... More
Pascal's triangle and word bases for blob algebra idealsJun 12 2007We give an elementary proof of isomorphism of the blob (diagram) algebra and the corresponding extended Temperley-Lieb algebra (defined by presentation).
Eddington-inspired Born-Infeld gravity: astrophysical and cosmological constraintsJan 12 2012In this letter we compute stringent astrophysical and cosmological constraints on a recently proposed Eddington-inspired Born-Infeld theory of gravity. We find, using a generalized version of the Zel'dovich approximation, that in this theory a pressureless ... More
Prospects for GeV-TeV detection of short gamma-ray bursts with extended emissionDec 02 2013Apr 21 2014We discuss the GeV to TeV photon emission of gamma-ray bursts (GRBs) within the refreshed shock and the continuous injection scenarios, motivated by the observation of extended emission in a substantial fraction of short GRBs. In the first model we assume ... More
Unified approach to growth and aging in biological, technical and biotechnical systemsJul 16 2012Complex systems, in many different scientific sectors, show coarse-grain properties with simple growth laws with respect to fundamental microscopic algorithms. We propose a classification scheme of growth laws which includes human aging, tumor (and/or ... More
Lorentz-Invariant Interpretation of Noncommutative Space-Time - global versionAug 12 2004Aug 24 2004The global version of the quantum symmetry defined by Chaichian et al (hep-th/0408069) is constructed.
Stability of vector bundles from F-theoryApr 15 1999We use a recently proposed formulation of stable holomorphic vector bundles $V$ on elliptically fibered Calabi--Yau n-fold $Z_n$ in terms of toric geometry to describe stability conditions on $V$. Using the toric map $f: W_{n+1} \to (V,Z_n)$ that identifies ... More
Nonlocal operator basis from the path representation of the M(k+1,k+2) and the M(k+1,2k+3) minimal modelsFeb 28 2008Aug 12 2008We reinterpret a path describing a state in an irreducible module of the unitary minimal model M(k+1,k+2) in terms of a string of charged operators acting on the module's ground-state path. Each such operator acts non-locally on a path. The path characteristics ... More
Paths for Z_k parafermionic modelsMar 01 2007Jul 03 2007We present a simple bijection between restricted (Bressoud) lattice paths and RSOS paths in regime II. Both types of paths describe states in Z_k parafermionic irreducible modules. The bijection implies a direct correspondence between a RSOS path and ... More
Embedding of bases: from the M(2,2k+1) to the M(3,4k+2-delta) modelsNov 03 2005Nov 09 2005A new quasi-particle basis of states is presented for all the irreducible modules of the M(3,p) models. It is formulated in terms of a combination of Virasoro modes and the modes of the field phi_{2,1}. This leads to a fermionic expression for particular ... More
Single-channel correlators and residue calculusMay 31 2001Aug 04 2001Some simple (namely, single-channel) correlation functions involving an arbitrary number of fields are computed by means of a direct application of the residue calculus, through partial fraction expansions. Examples are presented in minimal models and ... More
H_αLuminosity and Star Formation of Galaxies in HCGsApr 07 1999We have obtained $H_{\alpha}$ fluxes and luminosities for a sample of 95 accordant galaxies from observations of 31 Hickson Compact Groups (HCGs) in the North hemisphere. This sample is the largest $H_{\alpha}$ selected catalogue of galaxies having $H_{\alpha}$ ... More
On the geometry of the characteristic class of a star product on a symplectic manifoldDec 28 2001The characteristic class of a star product on a symplectic manifold appears as the class of a deformation of a given symplectic connection, as described by Fedosov. In contrast, one usually thinks of the characteristic class of a star product as the class ... More
The coincidence problem in linear dark energy modelsNov 01 2004Nov 12 2004We show that a solution to the the coincidence problem can be found in the context of a generic class of dark energy models with a scalar field, $\phi$, with a linear effective potential $V(\phi)$. We determine the fraction, $f$, of the total lifetime ... More
Could the dynamics of the Universe be influenced by what is going on inside black holes?Nov 01 2014Mar 26 2015We investigate the potential impact of mass inflation inside black holes on the dynamics of the Universe, considering a recent reformulation of general relativity, proposed in [1], which prevents the vacuum energy from acting as a gravitational source. ... More
Impact of the matter density uncertainty on the dark energy reconstructionMar 04 2009Jun 24 2009In this paper we study the impact of the fractional matter density uncertainty in the reconstruction of the equation of state of dark energy. We consider both standard reconstruction methods, based on the dynamical effect that dark energy has on the expansion ... More
Mass inflation in Eddington-inspired Born-Infeld black holes: analytical scaling solutionsFeb 26 2016We study the inner dynamics of accreting Eddington-inspired Born-Infeld black holes using the homogeneous approximation and taking charge as a surrogate for angular momentum. We show that there is a minimum of the accretion rate below which mass inflation ... More
Nonlocal conservation laws in N=1,2 Supersymetric KdV equationJan 19 1993The \nl \cls for the N=1 supersymmetric KdV equation are shown to be related in a simple way to powers of the fourth root of its Lax operator. This provides a direct link between the supersymmetry invariance and the existence of \nl conservation laws. ... More
Sensitivity of the Superconducting Transition Temperature to Changes in the Spin-Fluctuation Spectral WeightNov 20 2002In the simplest model of magnetic pairing, the transition temperature to the superconducting state depends on the dynamical susceptibility $\chi({\bf q},\omega)$. We discuss how $T_c$ is affected by different momentum and frequency parts of $\chi({\bf ... More
Description of Stellar Acoustic Modes Using the Local Wave ConceptJun 26 2006An understanding of stellar acoustic oscillations is attempted, using the local wave concept in semi-analytical calculations. The local homogeneity approximation allows to obtain simplified equations that can nevertheless describe the wave behavior down ... More
ad-nilpotent ideals of a Borel subalgebra IIIMar 05 2003Sep 30 2003This paper is devoted to a detailed study of certain remarkable posets which form a natural partition of all abelian ideals of a Borel subalgebra. Our main result is a nice uniform formula for the dimension of maximal ideals in these posets. We also obtain ... More
Resonance statistics in a microwave cavity with a thin antennaFeb 07 1997We propose a model for scattering in a flat resonator with a thin antenna. The results are applied to rectangular microwave cavities. We compute the resonance spacing distribution and show that it agrees well with experimental data provided the antenna ... More
Particles in RSOS pathsJan 13 2009Mar 03 2009We introduce a new representation of the paths of the Forrester-Baxter RSOS models which represents the states of the irreducible modules of the minimal models M(p',p). This representation is obtained by transforming the RSOS paths, for the cases p> 2p'-2, ... More
Fermi-gas interpretation of the RSOS path representation of the superconformal unitary minimal modelsMay 15 2008Aug 12 2008We derive new finitized fermionic characters for the superconformal unitary minimal models by interpreting the RSOS configuration sums as fermi-gas partition functions. This extends to the supersymmetric case the method introduced by Warnaar for the Virasoro ... More
Graded parafermions: standard and quasi-particle basesJan 20 2002Feb 05 2002Two bases of states are presented for modules of the graded parafermionic conformal field theory associated to the coset $\osp(1,2)_k/\uh(1)$. The first one is formulated in terms of the two fundamental (i.e., lowest dimensional) parafermionic modes. ... More
ROSAT Observations of Compact Groups of GalaxiesDec 11 1994Dec 15 1994A search for X-ray emission from compact groups revealed detection from 8 out of the 12 HCG images extracted from the ROSAT public archive. For two of them the X-ray emission originates from galaxies in the group. On the contrary, three groups show an ... More
An analysis of the zero energy states in grapheneDec 09 2015Using the concept of complex non PT symmetric potential we study creation of zero energy states in graphene by a scalar potential. The admissible range of the potential parameter values for which such states exist has been examined. The situation with ... More
A faithful tensor space representation for the blob algebraDec 19 2003We show that a certain tensor space representation of the blob algebra (an affine Hecke algebra quotient) is faithful.
Fourier Disentangling Using the Technology of Virtual ObservatoryMar 25 2010The Virtual Observatory is a new technology of the astronomical research allowing the seamless processing and analysis of a heterogeneous data obtained from a number of distributed data archives. It may also provide astronomical community with powerful ... More
Pion $p_T$ spectra in $p+p$ collisions as a function of $\sqrt{s}$ and event multiplicityAug 05 2014Sep 03 2014We study the charged pion transverse momentum ($p_T$) spectra in $p$+$p$ collisions as a function of collision energy $\sqrt{s}$ and event multiplicity using Tsallis distribution. This study gives an insight of the pion production process in $p+p$ collisions. ... More
The Z_k^(su(2),3/2) ParafermionsJun 23 2005Sep 19 2005We introduce a novel parafermionic theory for which the conformal dimension of the basic parafermion is 3(1-1/k)/2, with k even. The structure constants and the central charges are obtained from mode-type associativity calculations. The spectrum of the ... More
Parafermionic quasi-particle basis and fermionic-type charactersAug 09 2001Oct 23 2001A new basis of states for highest-weight modules in $\ZZ_k$ parafermionic conformal theories is displayed. It is formulated in terms of an effective exclusion principle constraining strings of $k$ fundamental parafermionic modes. The states of a module ... More
Heterotic String/F-theory Duality from Mirror SymmetryNov 25 1998Apr 15 1999We use local mirror symmetry in type IIA string compactifications on Calabi-Yau n+1 folds $X_{n+1}$ to construct vector bundles on (possibly singular) elliptically fibered Calabi-Yau n-folds Z_n. The interpretation of these data as valid classical solutions ... More
QCD Equation of State and Hadron Resonance GasDec 13 2009May 03 2010We compare the trace anomaly, strangeness and baryon number fluctuations calculated in lattice QCD with expectations based on hadron resonance gas model. We find that there is a significant discrepancy between the hadron resonance gas and the lattice ... More