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68 papers · 1 filter
A Note on Low-Dimensional String Compactifications
Keshav Dasgupta, Sunil Mukhi
We study supersymmetric compactifications of type II strings on eightfolds to two dimensions. It is demonstrated that the type IIB string on an eightfold is free of gravitational a…
Relativistic Mean Field calculations of nuclear properties in early stages of stellar collapse
F. K. Sutaria, J. A. Sheikh, A. Ray
We use the Relativistic Mean Field (RMF) method to calculate properties of neutron rich, usually deformed nuclei, important for equation of state calculations and which have signif…
Search for Diphoton Events with Large Missing Transverse Energy in proton-antiproton collisions at sqrt(s) = 1.8 TeV
S. Abachi
A search for signals of new physics has been carried out in the channel p pbar -> gamma gamma + ETmiss. This signature is expected in various recently proposed supersymmetric (SUSY…
Search for Top Squark Pair Production in the Dielectron Channel
D0 Collaboration, S. Abachi
This report describes the first search for top squark pair production in the channel stop_1 stopbar_1 -> b bbar chargino_1 chargino_1 -> ee+jets+MEt using 74.9 +- 8.9 pb^-1 of data…
The structure of the quantum mechanical state space and induced superselection rules
Joachim Kupsch
The role of superselection rules for the derivation of classical probability within quantum mechanics is investigated and examples of superselection rules induced by the environmen…
Initial Data and the Final Fate of Inhomogeneous Dust Collapse
I. H. Dwivedi, P. S. Joshi
We examine here the relevance of the initial state of a collapsing dust cloud towards determining it's final fate in the course of a continuing gravitational collapse. It is shown…
Limits on Anomalous Couplings from Events at TeV
The DZero Collaboration, S. Abachi
We have measured the gauge boson coupling parameters using () events at TeV. The data, corresponding to an integrated luminosi…
Evolution of the Fermi surface with carrier concentration in Bi_2Sr_2CaCu_2O_{8+δ}
H. Ding, M. R. Norman, T. Yokoya +6
We show, by use of angle-resolved photoemission spectroscopy, that underdoped Bi_2Sr_2CaCu_2O_{8+δ} appears to have a large Fermi surface centered at (π,π), even for samples with a…
Unified Accretion Disk Models Around Black Holes and Neutron Stars and Their Spectral Properties
Sandip K. Chakrabarti
We review the current understanding of accretion flows around compact objects with a special emphasis on advective disks. We discuss the influence of the centrifugal pressure suppo…
Numerical Simulations Of Advective Flows Around Black Holes
Sandip K. Chakrabarti, D. Ryu, D. Molteni +3
We present fully time-dependent solutions of accretion processes on black holes and compare them with analytical solutions. We use Smoothed Particle Hydrodynamics and Total Variati…
Eulerian Walkers as a model of Self-Organised Criticality
V. B. Priezzhev, Deepak Dhar, Abhishek Dhar +1
We propose a new model of self-organized criticality. A particle is dropped at random on a lattice and moves along directions specified by arrows at each site. As it moves, it chan…
Solutions of Two Dimensional Viscous Accretion and Winds In Kerr Black Hole Geometry
S. K. Chakrabarti
We extend our previous studies of shock waves and shock-free solutions in thin accretion and winds in pseudo-Newtonian geometry to the case when the flow is ``two-dimensional'' and…
Global Solutions of Viscous Transonic Flows in Kerr Geometry I: Weak Viscosity Limit
Sandip K. Chakrabarti
We present fully general relativistic equations governing viscous transonic flows in vertical equilibrium in Kerr geometry. We find the complete set of global solutions (both for O…
Observational Signature of the `Boundary Layer' of Galactic and Extragalactic Black Holes
S. K. Chakrabarti, L. Titarchuk, D. Kazanas +1
We present spectral properties of an accretion disk model, in which a Keplerian accretion disk is flanked by a sub-Keplerian halo component terminating at a standing shock. The pos…
Finite Temperature Properties of the SO(3) Lattice Gauge Theory
Srinath Cheluvaraja, H. S. Sharatchandra
We make a numerical study of the finite temperature properties of the SO(3) lattice gauge theory. As its symmetry properties are quite different from those of the SU(2) LGT, a diff…
Zero-temperature Hysteresis in Random-field Ising Model on a Bethe Lattice
Deepak Dhar, Prabodh Shukla, James P. Sethna
We consider the single-spin-flip dynamics of the random-field Ising model on a Bethe lattice at zero temperature in the presence of a uniform external field. We determine the avera…
Weil-Petersson geometry and determinant bundles on inductive limits of moduli spaces
Indranil Biswas, Subhashis Nag
In an earlier paper [Acta Mathematica, v. 176, 1996, 145-169, alg-geom/9505024 ] the present authors and Dennis Sullivan constructed the universal direct system of the classical Te…
Constraints on the Charged Higgs Sector from the Tevatron Collider Data on Top Quark Decay
Monoranjan Guchait, D. P. Roy
The top quark data in the lepton plus channel offers a viable probe for the charged Higgs boson signal. We analyse the recent Tevatron collider data in this channel to obtain a…
Quarkonium production via fragmentation: A review
K. Sridhar
We review the physics of quarkonium production at high energy colliders, with a specific emphasis on production fragmentation. We discuss the fragmentation picture for the pr…
The transitions and oscillations
G. V. Dass, K. V. L. Sarma
We estimate the product of the relative strength of the amplitude in the decay and the width-difference parameter . For…
Observability of Quantum State of Black Hole
Justin R. David, Avinash Dhar, Gautam Mandal +1
We analyze terms subleading to Rutherford in the -matrix between black hole and probes of successively high energies. We show that by an appropriate choice of the probe one can…
Stability of the Bulk Phase Diagram of the SU(2) Lattice Gauge Theory with Fundamental - Adjoint Action
Saumen Datta, Rajiv V. Gavai
Using improved mean field and strong coupling expansions we re-analyse the bulk phase diagram of the fundamental-adjoint action of the SU(2) Lattice Gauge Theory. We find that the…
J/psi Spin Asymmetries in the Colour-Octet Model
Sourendu Gupta, Prakash Mathews
We investigate the pattern of asymmetries in the colour-octet model for inclusive production of charmonium with polarised initial state hadrons and photons. We find that singly pol…
Negative Pressure and Naked Singularities in Spherical Gravitational Collapse
F. I. Cooperstock, S. Jhingan, P. S. Joshi +1
Assuming the weak energy condition, we study the nature of the non-central shell-focussing singularity which can form in the gravitational collapse of a spherical compact object in…