String-Corrected Black Holes

Details String-Corrected Black Holes String-Corrected Black Holes

2004-11-30

arxiv.org/abs/hep-th/0411272v2

JHEP0505:035,2005

Physics

High Energy Physics

High Energy Physics - Theory

22 pages, 6 figures, harvmac, epsf

Scientific paper

10.1088/1126-6708/2005/05/035

We investigate the geometry of four dimensional black hole solutions in the presence of stringy higher curvature corrections to the low energy effective action. For certain supersymmetric two charge black holes these corrections drastically alter the causal structure of the solution, converting seemingly pathological null singularities into timelike singularities hidden behind a finite area horizon. We establish, analytically and numerically, that the string-corrected two-charge black hole metric has the same Penrose diagram as the extremal four-charge black hole. The higher derivative terms lead to another dramatic effect -- the gravitational force exerted by a black hole on an inertial observer is no longer purely attractive! The magnitude of this effect is related to the size of the compactification manifold.

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