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143 papers · 1 filter
Supersymmetric Dark Matter and Yukawa Unification
Utpal Chattopadhyay, Achille Corsetti, Pran Nath
An analysis of supersymmetric dark matter under the Yukawa unification constraint is given. The analysis utilizes the recently discovered region of the parameter space of models wi…
On Gorenstein Surfaces Dominated by P^2
R. V. Gurjar, C. R. Pradeep, D. -Q. Zhang
In this paper we prove that a normal Gorenstein surface dominated by the projective plane P^2 is isomorphic to a quotient P^2/G, where G is a finite group of automorphisms of P^2 (…
Quantum mechanics without spacetime - a possible case for noncommutative differential geometry?
T. P. Singh
The rules of quantum mechanics require a time coordinate for their formulation. However, a notion of time is in general possible only when a classical spacetime geometry exists. Su…
Quark number susceptibilities from lattice QCD
Rajiv V. Gavai
Results from our recent investigations of quark number susceptibilities in both quenched and 2-flavour QCD are presented as a function of valence quark mass and temperature. A stro…
Constraints On Radiative Neutrino Mass Models From Oscillation Data
Probir Roy, Sudhir K. Vempati
The three neutrino Zee model and its extension including three active and one sterile species are studied in the light of new neutrino oscillation data. We obtain analytical relati…
Anomalous Neutrino Interaction, Muon g-2, and Atomic Parity Nonconservation
Ernest Ma, D. P. Roy
We propose a simple unified description of two recent precision measurements which suggest new physics beyond the Standard Model of particle interactions, i.e. the deviation of $\s…
Locating the minimum : Approach to equilibrium in a disordered, symmetric zero range process
Mustansir Barma, Kavita Jain
We consider the dynamics of the disordered, one-dimensional, symmetric zero range process in which a particle from an occupied site hops to its nearest neighbour with a quenche…
Discussion on a possible neutrino detector located in India
M. V. N. Murthy, U. A. Yajnik
We have identified some important and worthwhile physics opportunitites with a possible neutrino detector located in India. Particular emphasis is placed on the geographical advant…
Toward a Quantization of Null Dust Collapse
Cenalo Vaz, Louis Witten, T. P. Singh
Spherically symmetric, null dust clouds, like their time-like counterparts, may collapse classically into black holes or naked singularities depending on their initial conditions.…
Effect of Vortex Screening on the Bose Glass to Entangled Liquid Transition of Flux Lines in Superconductors
Ajay Nandgaonkar, D. G. Kanhere, Nandini Trivedi
We study the phase diagram of flux lines in superconductors with columnar pins. Based on numerical exact diagonalisation simulations on small clusters, we get two phases of vortice…
Appearance of the central singularity in spherical collapse
S. S. Deshingkar, P. S. Joshi, I. H. Dwivedi
We analyze here the structure of non-radial nonspacelike geodesics terminating in the past at a naked singularity formed as the end state of inhomogeneous dust collapse. The spectr…
Measuring Cosmic Defect Correlations in Liquid Crystals
Rajarshi Ray, Ajit M. Srivastava
From the theory of topological defect formation proposed for the early universe, the so called Kibble mechanism, it follows that the density correlation functions of defects and an…
Search for R-parity Violating Supersymmetry in Dimuon and Four-Jets Channel
D0 collaboration, V. M. Abazov etal
We present results of a search for R-parity-violating decay of the neutralino chi_1^0, taken to be the Lightest Supersymmetric Particle. It is assumed that this decay proceeds thro…
Search for Leptoquark Pairs Decaying to neutrino neutrino + jets in p anti-p Collisions at s**(1/2)=1.8 TeV
D0 Collaboration, V. M. Abazov
We present the results of a search for leptoquark (LQ) pairs in (85.2 +- 3.7) pb^{-1} of p anti-p collider data collected by the D0 experiment at the Fermilab Tevatron. We observe…
Scaling Exponent for Coarsening in a 1D q-state system
Ajay Gopinathan
An exponent which characterises non-equilibrium coarsening processes is calculated in a deterministic solvable model of coarsening for a 1D q-state Potts system. We study how t…
Quantum Aspects of GMS Solutions of Noncommutative Field Theory and Large N Limit of Matrix Models
Gautam Mandal, Soo-Jong Rey, Spenta Wadia
We investigate quantum aspects of Gopakumar-Minwalla-Strominger (GMS) solutions of noncommutative field theory (NCFT) at large noncommutativity limit, . Building upon…
Study of the W+W-gamma Process and Limits on Anomalous Quartic Gauge Boson Couplings at LEP
L3 Collaboration
The process e+e- -> W+ W- gamma is studied using the data collected by the L3 detector at LEP. New results, corresponding to an integrated luminosity of 427.4 pb-1 at centre-of-mas…
Pulsar Scintillation in the Local ISM: Loop I and Beyond
N. D. Ramesh Bhat, Yashwant Gupta
Recent pulsar scintillation measurements from Ooty, in conjunction with those from Parkes and other large radio telescopes, are used for a systematic investigation of the Local Int…
Double-Tag Events in Two-Photon Collisions at LEP
L3 Collaboration
Double-tag events in two-photon collisions are studied using the L3 detector at LEP centre-of-mass energies from root(s)=189 GeV to 209 GeV. The cross sections of the e+e- -> e+e-…
Disk-Jet Connection in Cygnus X-3
M. Choudhury, A. R. Rao, S. V. Vadawale +2
We present the results of a detailed correlation study between the soft X-ray, hard X-ray, and radio emission (obtained from RXTE ASM, BATSE, and GBI observations, respectively) of…
Tachyon Condensation and Black Hole Entropy
Atish Dabholkar
String propagation on a cone with deficit angle is considered for the purpose of computing the entropy of a large mass black hole. The entropy computed using the…
f_1(1285) Formation in Two-Photon Collisions at LEP
L3 Collaboration
The eta pi^+ pi^- final state in two-photon collisions is studied with the L3 detector at LEP, at centre-of-mass energies from 183 to 209 GeV with an integrated luminosity of 664.6…
X-ray properties of the microquasar GRS 1915+105 during a variability class transition
S. Naik, P. C. Agrawal, A. R. Rao +1
We present a detailed X-ray study of the microquasar GRS 1915+105 during a variability class transition observed in 2000 June with the PPCs of the Indian X-ray Astronomy Experiment…
Unification, , the Constraint and Nonuniversalities
Utpal Chattopadhyay, Pran Nath
An analysis is given of the Yukawa coupling unification in view of the recent result from Brookhaven on and under the constraint of . We explore unifi…