Curvature-corrected dilatonic black holes and black hole -- string transition

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dc.creatorGal'tsov, Dmitri V.
dc.creatorDavydov, Evgeny A.
dc.date2008-12-30
dc.date.accessioned2026-07-07T13:04:50Z
dc.date.available2026-07-07T13:04:50Z
dc.descriptionWe investigate extremal charged black hole solutions in the four-dimensional string frame Gauss-Bonnet gravity with the Maxwell field and the dilaton. Without curvature corrections, the extremal electrically charged dilatonic black holes have singular horizon and zero Bekenstein entropy. When the Gauss-Bonnet term is switched on, the horizon radius expands to a finite value provided curvature corrections are strong enough. Below a certain threshold value of the Gauss-Bonnet coupling the extremal black hole solutions cease to exist. Since decreasing Gauss-Bonnet coupling corresponds to decreasing string coupling $g_s$, the situation can tentatively be interpreted as classical indication on the black hole -- string transition. Previously the extremal dilaton black holes were studied in the Einstein-frame version of the Gauss-Bonnet gravity. Here we work in the string frame version of this theory with the S-duality symmetric dilaton function as required by the heterotic string theory.
dc.description14 pages, 2 figures
dc.identifierhttps://arxiv.org/abs/0812.5103
dc.identifierhttp://arxiv.org/abs/0812.5103
dc.identifierJETP Lett.89:102-107,2009
dc.identifierdoi:10.1134/S0021364009030023
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/227306
dc.subjectHigh Energy Physics - Theory
dc.titleCurvature-corrected dilatonic black holes and black hole -- string transition
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