Massive and Massless Supersymmetric Black Holes
Abstract
We review some recent work on the existence and classification of extreme blackholetype solutions in N = 8 supergravity. For the black holes considered (those that are also solutions of N = 4 supergravity and of the EinsteinMaxwelldilaton theory with coupling a) a complete classification is achieved: the only possible values of a are √3,1,1/√3,0. Up to U duality transformations there is only one solution for each of those values. The exception is a = 0 for which an additional extreme but nonsupersymmetric ReissnerNordström black hole solution exists. We also study the socalled massless blackhole solutions. We argue that they can be understood as composite objects. At least one of the components would have "negative mass". We also argue that these states, being annihilated by all the generators in the supersymmetry algebra, could also constitute alternative vacua of the supergravity theory.
 Publication:

Nuclear Physics B Proceedings Supplements
 Pub Date:
 May 1997
 DOI:
 10.1016/S09205632(97)000820
 arXiv:
 arXiv:hepth/9608044
 Bibcode:
 1997NuPhS..55..219O
 Keywords:

 High Energy Physics  Theory
 EPrint:
 Latex file, 18 pages (less with optional macros included). Contribution to the Trieste Workshop on String Theory, Gauge theory and Quantum Gravity