Thermodynamics of Black Holes in Presence of String Instantons
Francois Englert, Laurent Houart, Paul Windey
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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