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Charged black holes in effective string theory

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arxiv hep-th/9212146 v1 pith:EGFARO2H submitted 1992-12-23 hep-th

classification hep-th
keywords blackstringchargedeffectiveholestheoryvalueabove
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We investigate the qualitative new features of charged dilatonic black holes which emerge when both the Yang-Mills and Gauss-Bonnet curvature corrections are included in the effective action. We consider perturbative effects by an expansion up to second order in the inverse string tension on the four dimensional Schwarzschild background and determine the backreaction. We calculate the thermodynamical functions and show that for magnetic charge above a critical value, the temperature of the black hole has a maximum and goes to zero for a finite value of the mass. This indicates that the conventional Hawking evaporation law is modified by string theory at a classical level.

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  1. Growing black-hole hair in nonminimally coupled biscalar gravity

    gr-qc 2025-01 conditional novelty 7.0 of 10

    Numerical simulations in the decoupling limit show that an axion and a dilaton form non-trivial hair around black holes in axi-dilaton gravity, with the kinetic coupling between the fields increasing the effect.

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