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11 papers · 2 filters
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…
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…
Universailty of Low Energy Absorption Cross-sections for Black Holes
Sumit R. Das, Gary Gibbons, Samir D. Mathur
In this paper we compute the low energy absorption cross-section for minimally coupled massles scalars and spin- particles, into a general spherically symmetric black hole in…
Interactions involving D-branes
Sumit R. Das, Samir D. Mathur
We investigate some aspects of the spectrum of D-branes and their interactions with closed strings. As argued earlier, a collection of many D-strings behaves, at large dilaton valu…
Orbifold and Orientifold Compactifications of F-Theory and M-Theory to Six and Four Dimensions
Rajesh Gopakumar, Sunil Mukhi
We study orbifold compactifications of F-theory which lead to supersymmetry in 6 and 4 spacetime dimensions. These are dual to specific orientifolds of M-theory, and in many…
F-Theory at Constant Coupling
Keshav Dasgupta, Sunil Mukhi
The subspace of the moduli space of F-theory on K3 over which the coupling remains constant develops new branches at special values of this coupling. These values correspond to fix…
Comparing decay rates for black holes and D-branes
Sumit R. Das, Samir D. Mathur
We compute the leading order (in coupling) rate of emission of low energy quanta from a slightly nonextremal system of 1 and 5 D-branes. We also compute the classical cross-section…
F-theory and Orientifolds
Ashoke Sen
By analyzing -theory on near the orbifold limit of we establish the equivalence between -theory on and an orientifold of type IIB on , which in turn, is r…
Absorption vs Decay of Black holes in string theory and T-symmetry
Avinash Dhar, Gautam Mandal, Spenta R. Wadia
Classically a black hole can absorb but not emit energy. We discuss how this T-asymmetric property of black holes arises in the recently proposed (T-symmetric) microscopic models o…
Excitations of D-strings, Entropy and Duality
Sumit R. Das, Samir D. Mathur
We examine the BPS and low energy non-BPS excitations of the D-string, in terms of open strings that travel on the D-string. We use this to study the energy thresholds for exciting…
Spin dependent extension of Calogero-Sutherland model through anyon like representations of permutation operators
B. Basu-Mallick
We consider a type of spin dependent Calogero-Sutherland model, containing an arbitrary representation of the permutation operators on the combined internal space of all…