On the Evaporation of Black Holes in String Theory

Details On the Evaporation of Black Holes in String Theory On the Evaporation of Black Holes in String Theory

1991-11-18

arxiv.org/abs/hep-th/9111031v1

Phys.Lett.B276:56-66,1992

Physics

High Energy Physics

High Energy Physics - Theory

17 pages

Scientific paper

10.1016/0370-2693(92)90541-B

We show that, in string theory, the quantum evaporation and decay of black holes in two-dimensional target space is related to imaginary parts in higher-genus string amplitudes. These arise from the regularisation of modular infinities due to the sum over world-sheet configurations, that are known to express the instabilities of massive string states in general, and are not thermal in character. The absence of such imaginary parts in the matrix model limit confirms that the latter constitutes the final stage of the evaporation process, at least in perturbation theory. Our arguments appear to be quite generic, related only to the summation over world-sheet surfaces, and hence should also apply to higher-dimensional target spaces.

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