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13 papers · 2 filters
Boosts, Schwarzschild Black Holes and Absorption cross-sections in M theory
Sumit R. Das, Samir D. Mathur, S. Kalyana Rama +1
dimensional neutral black strings wrapped on a circle are related to dimensional charged black holes by boosts. We show that the boost has to be performed in the coveri…
BPS Nature of 3-String Junctions
Keshav Dasgupta, Sunil Mukhi
We study BPS-saturated classical solutions for the world-sheet theory of a D-string in the presence of a point charge. These solutions are interpreted as describing planar 3-string…
Anomaly Inflow on Orientifold Planes
Keshav Dasgupta, Sunil Mukhi
We examine some six-dimensional orientifold models with supersymmetry, which can be realised as intersecting 7-branes and 7-planes. These models are studied in the light of…
D-brane decay and Hawking Radiation
Sumit R. Das
Tree level decay amplitudes of near-BPS D-brane configurations are known to exactly reproduce Hawking radiation rates from corresponding black holes at low energies even though the…
Duality in osp(1|2) Conformal Field Theory and link invariants
I. P. Ennes, P. Ramadevi, A. V. Ramallo +1
We study the crossing symmetry of the conformal blocks of the conformal field theory based on the affine Lie superalgebra osp(1|2). Within the framework of a free field realization…
Probing Type I' String Theory Using D0 and D4-Branes
Justin R. David, Avinash Dhar, Gautam Mandal
We analyse the velocity-dependent potentials seen by D0 and D4-brane probes moving in Type I' background for head-on scattering off the fixed planes. We find that at short distance…
Gravitational Couplings and Orientifolds
Keshav Dasgupta, Dileep P. Jatkar, Sunil Mukhi
The interplay between gravitational couplings on branes and the occurrence of fractional flux in low dimensional orientifolds is examined. It is argued that gravitational couplings…
The emergence of space-time gravitational physics as an effective theory from the c=1 matrix model
Avinash Dhar
We discuss further a recent space-time interpretation of the matrix model which retains both sides of the inverted harmonic oscillator potential in the underlying free fermio…
Emission from parallel p-brane Black Holes
Sumit R. Das
The entropy of a near-extremal black hole made of parallel D-branes has been shown to agree, upto a numerical factor, with that of the gas of massless open string states on the bra…
Nonrenormalization of Mass of Some Nonsupersymmetric String States
Atish Dabholkar, Gautam Mandal, P. Ramadevi
It is argued that the quantum correction to the mass of some very massive, nonsupersymmetric states vanishes in inverse proportion to their tree-level mass to all orders in string…
The Effectiveness of D-branes in the Description of Near-Extremal Black Holes
Sumit R. Das
It is known that weak coupling calculations of absorption or emission by slightly non-extremal D-brane configurations are in exact agreement with semiclassical results for the blac…
Microstates of Non-supersymmetric Black Holes
Atish Dabholkar
A five-dimensional dyonic black hole in Type-I theory is considered that is extremal but non-supersymmetric. It is shown that the Bekenstein-Hawking entropy of this black hole coun…
Multi-parameter deformed and nonstandard Yangian symmetry in a novel class of spin Calogero-Sutherland models
B. Basu-Mallick, Anjan Kundu
It is well known through a recent work of Bernard, Gaudin, Haldane and Pasquier (BGHP) that the usual spin Calogero-Sutherland (CS) model, containing particles with internal de…