Black Holes with a Massive Dilaton

Details Black Holes with a Massive Dilaton Black Holes with a Massive Dilaton

1992-09-19

arxiv.org/abs/hep-th/9209070v2

Phys.Rev. D47 (1993) 2411-2422

Physics

High Energy Physics

High Energy Physics - Theory

36 pages with 5 figures (as uuencoded compressed tar file) (revised version has one major change in bound on mass for extremal

Scientific paper

10.1103/PhysRevD.47.2411

The modifications of dilaton black holes which result when the dilaton acquires a mass are investigated. We derive some general constraints on the number of horizons of the black hole and argue that if the product of the black hole charge $Q$ and the dilaton mass $m$ satisfies $Q m < O(1)$ then the black hole has only one horizon. We also argue that for $Q m > O(1)$ there may exist solutions with three horizons and we discuss the causal structure of such solutions. We also investigate the possible structures of extremal solutions and the related problem of two-dimensional dilaton gravity with a massive dilaton.

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