Evaporation of a black hole off of a tense brane

TL;DR

This paper computes how black hole evaporation properties change when the black hole is on a brane with tension in extra dimensions, showing that increased tension reduces bulk radiation and enhances semiclassical decay descriptions.

Contribution

It provides the first detailed calculation of gray-body factors for black holes on a tense brane with extra dimensions, highlighting tension's impact on black hole radiation.

Findings

Power radiated into the bulk decreases with increasing brane tension.

Higher brane tension increases the black hole's entropy and effective Planck constant.

Semiclassical decay descriptions become more reliable at higher tension.

Abstract

We calculate the gray-body factors for scalar, vector and graviton fields in the background of an exact black hole localized on a tensional 3-brane in a world with two large extra dimensions. Finite brane tension modifies the standard results for the case with of a black hole on a brane with negligible tension. For a black hole of a fixed mass, the power carried away into the bulk diminishes as the tension increases, because the effective Planck constant, and therefore entropy of a fixed mass black hole, increase. In this limit, the semiclassical description of black hole decay becomes more reliable.