Brick Walls on the Brane
A.J.M. Medved (University of Alberta)

TL;DR
This paper extends the brick-wall model to a Randall-Sundrum brane world, demonstrating that the Bekenstein-Hawking entropy law holds for black holes appearing on the brane, even with complex bulk geometries.
Contribution
It applies the brick-wall formalism to thermal bulk fields in a brane world scenario without simplifying assumptions, confirming the entropy law's validity in this context.
Findings
Bekenstein-Hawking entropy law is preserved in the brane world scenario.
The analysis avoids unjustified simplifying assumptions used in prior work.
Black hole in the bulk appears as a Schwarzschild black hole on the brane.
Abstract
The so-called ``brick-wall model'' is a semi-classical approach that has been used to explain black hole entropy in terms of thermal matter fields. Here, we apply the brick-wall formalism to thermal bulk fields in a Randall-Sundrum brane world scenario. In this case, the black hole entity is really a string-like object in the anti-de Sitter bulk, while appearing as a Schwarzchild black hole to observers living on the brane. In spite of these exotic circumstances, we establish that the Bekenstein-Hawking entropy law is preserved. Although a similar calculation was recently considered in the literature, this prior work invoked a simplifying assumption (which we avoid) that can not be adequately justified.
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