Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2003-01-06
JHEP 0305:008,2003
Physics
High Energy Physics
High Energy Physics - Theory
15 pages, Revtex; references added and very minor changes
Scientific paper
10.1088/1126-6708/2003/05/008
Some recent studies have considered a Randall-Sundrum-like brane world evolving in the background of an anti-de Sitter Reissner-Nordstrom black hole. For this scenario, it has been shown that, when the bulk charge is non-vanishing, a singularity-free ``bounce'' universe will always be obtained. However, for the physically relevant case of a de Sitter brane world, we have recently argued that, from a holographic (c-theorem) perspective, such brane worlds may not be physically viable. In the current paper, we reconsider the validity of such models by appealing to the so-called ``causal entropy bound''. In this framework, a paradoxical outcome is obtained: these brane worlds are indeed holographically viable, provided that the bulk charge is not too small. We go on to argue that this new finding is likely the more reliable one.
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