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Equivalence of Three Wall Crossing Formulae
Ashoke Sen
The wall crossing formula of Kontsevich and Soibelman gives an implicit relation between the BPS indices on two sides of the wall of marginal stability by equating two symplectomor…
Logarithmic Corrections to Rotating Extremal Black Hole Entropy in Four and Five Dimensions
Ashoke Sen
We compute logarithmic corrections to the entropy of rotating extremal black holes using quantum entropy function i.e. Euclidean quantum gravity approach. Our analysis includes fiv…
Logarithmic Corrections to N=2 Black Hole Entropy: An Infrared Window into the Microstates
Ashoke Sen
Logarithmic corrections to the extremal black hole entropy can be computed purely in terms of the low energy data -- the spectrum of massless fields and their interaction. The dema…
Logarithmic Corrections to N=4 and N=8 Black Hole Entropy: A One Loop Test of Quantum Gravity
Shamik Banerjee, Rajesh Kumar Gupta, Ipsita Mandal +1
We compute logarithmic corrections to the entropy of supersymmetric extremal black holes in N=4 and N=8 supersymmetric string theories and find results in perfect agreement with th…
Negative discriminant states in N=4 supersymmetric string theories
Ashoke Sen
Single centered BPS black hole solutions exist only when the charge carried by the black hole has positive discriminant. On the other hand the exact dyon spectrum in heterotic stri…
A fixed point formula for the index of multi-centered N=2 black holes
Jan Manschot, Boris Pioline, Ashoke Sen
We propose a formula for computing the (moduli-dependent) contribution of multi-centered solutions to the total BPS index in terms of the (moduli-independent) indices associated to…