Black Hole Solutions in String Theory

Abstract

We present two-parameter solutions of the low-energy four-dimensional heterotic string which in the extremal limit reduce to supersymmetric monopole, string and domain wall solutions. The effective scalar coupling to the Maxwell field, $e^{-\alpha \varphi }{F}_{\mu \nu }{F}^{\mu \nu }$, gives rise to a new string black hole with $\alpha =\sqrt{3}$, in contrast to the pure dilaton black hole solution which has $\alpha =1$. Implications of string/fivebrane duality in $D=10$ to four-dimensional dualities are discussed.

Based on talks given at MRST 94, McGill University and at Mini-workshop on Extended Objects, Newton Institute, March 1994, 4 pages, TeX