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A Twist in the Dyon Partition Function
Ashoke Sen
In four dimensional string theories with N=4 and N=8 supersymmetries one can often define twisted index in a subspace of the moduli space which captures additional information on t…
Two Charge System Revisited: Small Black Holes or Horizonless Solutions?
Ashoke Sen
A two charge system in string theory preserving eight supercharges can be described as a small black hole that has zero entropy in the supergravity approximation, but classical hig…
Arithmetic of N=8 Black Holes
Ashoke Sen
The microscopic formula for the degeneracies of 1/8 BPS black holes in type II string theory compactified on a six dimensional torus can be expressed as a sum of several terms. One…
Black Hole Hair Removal: Non-linear Analysis
Dileep P. Jatkar, Ashoke Sen, Yogesh K. Srivastava
BMPV black holes in flat transverse space and in Taub-NUT space have identical near horizon geometries but different microscopic degeneracies. It has been proposed that this differ…
Supersymmetry, Localization and Quantum Entropy Function
Nabamita Banerjee, Shamik Banerjee, Rajesh Kumar Gupta +2
AdS_2/CFT_1 correspondence leads to a prescription for computing the degeneracy of black hole states in terms of path integral over string fields living on the near horizon geometr…
Arithmetic of Quantum Entropy Function
Ashoke Sen
Quantum entropy function is a proposal for computing the entropy associated with the horizon of a black hole in the extremal limit, and is related via AdS/CFT correspondence to the…