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Thermodynamics of Black Holes in Presence of String Instantons

Francois Englert, Laurent Houart, Paul Windey

hep-tharXiv:hep-th/9606179

Abstract

The coupling of a Nambu-Goto string to gravity allows for Schwarzschild black holes whose entropy to area relation is S=(A/4)(1-4μ), where μ is the string tension. The departure from A/4 universality results from a string instanton which leads to a materialisation of the horizon at the quantum level.

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