Black Holes Coupled to a Massive Dilaton

Abstract

We investigate charged black holes coupled to a massive dilaton. It is shown that black holes which are large compared to the Compton wavelength of the dilaton resemble the Reissner-Nordström solution, while those which are smaller than this scale resemble the massless dilaton solutions. Black holes of order the Compton wavelength of the dilaton can have wormholes outside the event horizon in the string metric. Unlike all previous black hole solutions, nearly extremal and extremal black holes (of any size) repel each other. We argue that extremal black holes are quantum mechanically unstable to decay into several widely separated black holes. We present analytic arguments and extensive numerical results to support these conclusions.

36 p., (one reference added, minor typos), UCSBTH-92-17, YCTP-92-P37

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• Rotating Charged Black Hole Solution in Heterotic String Theory
• Black Holes as Elementary Particles
• Charged Black Holes in Two-Dimensional String Theory

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