Thermodynamics of Black Holes in Presence of String Instantons
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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.
5 pages, LaTeX, to appear in the Proceedings of the Second International Sakharov Conference, Moscow, May 1996, based on a talk given by F. Englert. More detailed version: hep-th/9507061
5 pages, LaTeX, to appear in the Proceedings of the Second International Sakharov Conference, Moscow, May 1996, based on a talk given by F. Englert. More detailed version: hep-th/9507061