C-Functions in Lovelock Gravity

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We present C-functions for static and spherically symmetric spacetimes in Lovelock gravity theories. These functions are monotonically increasing functions of the outward radial coordinate and acquire their minima when evaluated on the horizon. Unlike the case of Einstein gravity, where there is a single C-function, we find that this function is non-unique in the case of Lovelock gravity. We define two C-functions, which agree at the horizon giving the black hole entropy, and state the different energy conditions that must hold in order for these functions to satisfy the monotonicity condition.
17 pages, 3 figures, v2-references added, few comments added

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High Energy Physics - Theory

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http://salesiana.dossiersoluciones.com/handle/123456789/200190

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/0802.1290
 http://arxiv.org/abs/0802.1290
 JHEP0805:061,2008
 doi:10.1088/1126-6708/2008/05/061

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arXiv