Bulk emission of scalars by a rotating black hole

Details Bulk emission of scalars by a rotating black hole Bulk emission of scalars by a rotating black hole

2008-01-31

arxiv.org/abs/0801.4910v2

JHEP 0806:071,2008

Physics

High Energy Physics

High Energy Physics - Theory

31 pages, 14 figures, minor changes, published in JHEP

Scientific paper

10.1088/1126-6708/2008/06/071

We study in detail the scalar-field Hawking radiation emitted into the bulk by a higher-dimensional, rotating black hole. We numerically compute the angular eigenvalues, and solve the radial equation of motion in order to find transmission factors. The latter are found to be enhanced by the angular momentum of the black hole, and to exhibit the well-known effect of superradiance. The corresponding power spectra for scalar fields show an enhancement with the number of dimensions, as in the non-rotating case. We compute the total mass loss rate of the black hole for a variety of black-hole angular momenta and bulk dimensions, and find that, in all cases, the bulk emission remains significantly smaller than the brane emission. The angular-momentum loss rate is also computed and found to have a smaller value in the bulk than on the brane. We present accurate bulk-to-brane emission ratios for a range of scenarios.

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