Aspects of D1/D5 system: Hawking radiation, black hole fragmentation and non-commutative geometry

by Gautam MANDAL (CERN)

Tuesday 26 Oct 1999, 14:00 → 16:30 Europe/Zurich

TH Auditorium (CERN)

I will discuss some aspects of the D1/D5 system, the five-dimensional black hole and the associated superconformal field theory (SCFT) in 2 dimensions. We will briefly review how such a SCFT arises from the gauge theory of open strings on the D-brane system, leading to a target space which is an orbifold. The resulting twisted sectors lead to a different 'effective string' picture than initially proposed and removes earlier discrepancies in Hawking radiation rates between brane computations and supergravity. We will discuss the issue of marginal decay and fragmentation of the five-dimensional black holes in the absence of moduli. We will discuss how to construct true bound states (stable black holes), both in terms of supergravity and gauge theory. The gauge theory corresponding to the stable D1/D5 system turns out to be non-commutative.