Black Hole Entropy and String Theory
Abstract
This is an expanded version of a talk given at ``{\em IInd Recontre du Vietnam}'' held at Ho Chi Minh City in October, 1995. We discuss several aspects of black hole entropy in string theory. We first explain why the geometric entropy in two dimensional noncritical string theory is nonperturbatively finite. We then explain the philosophy of regarding massive string states as black branes and how the BeckensteinHawking entropy for extremal BPS black holes may be understood as coming from degeneracy of string states. This is then discussed in the context of Dstrings in Type IIB superstrings. We then describe nonBPS excitations of Dstrings and their entropy and explore the possibility that their decay describes Hawking radiation. For these Dstrings and other Dbranes the entropy and temperature are consequences of the physical motion of stuck open strings along the Dbrane and this leads to a simple spacetime interpretation. Finally we speculate that the horizon may be itself regarded as a Dbrane.
 Publication:

arXiv eprints
 Pub Date:
 February 1996
 DOI:
 10.48550/arXiv.hepth/9602172
 arXiv:
 arXiv:hepth/9602172
 Bibcode:
 1996hep.th....2172D
 Keywords:

 High Energy Physics  Theory
 EPrint:
 12 pages, LaTeX