Classical and Semiclassical Properties of Extremal Black Holes with Dilaton and Modulus Fields

Details Classical and Semiclassical Properties of Extremal Black Holes with Dilaton and Modulus Fields Classical and Semiclassical Properties of Extremal Black Holes with Dilaton and Modulus Fields

1993-12-21

arxiv.org/abs/hep-th/9312171v2

Nucl.Phys.B427:669-696,1994

Physics

High Energy Physics

High Energy Physics - Theory

25 pages (3 figures available upon request), plain TEX,INFN-CA-20-93 (typographical errors corrected)

Scientific paper

10.1016/0550-3213(94)90644-0

We discuss both classical and semiclassical properties of extremal black holes in theories where the dilaton and a modulus field are present. We find that the corresponding 2-dim geometry is asymptotically anti-de Sitter rather then asymptotically flat as in the purely dilatonic case. This fact has many important consequences, which we analyze at length, both for the classical behaviour and for the thermodynamical properties of the black hole. We also study the Hawking evaporation process in the semiclassical approximation. The calculations strongly indicates the emergence of a stable ground state as the end point of the process. Some comments are made about the relevance of our results for the problem of information loss in black hole physics.

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