2005/06/30 by Eylee Jung, D. K. Park, D.K. Park · 2 citations
Physics and Astronomy · #Astrophysical Phenomena and Observations #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #hep-th
paper · pdf · doi:10.1016/j.nuclphysb.2005.10.012
published as Nucl.Phys. B731 (2005) 171-187 · 21 pages, 11 eps figures, V2: 25 pages, one appendix added, one more figure included, final version in NPB
openalex publication_date 2005/11/03 · arxiv created 2005/11/16 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The absorption and emission spectra for the minimally-coupled brane and bulk scalar fields are numerically computed when the spacetime is a 5d rotating black hole carrying the two different angular momentum parameters a and b. The effect of the superradiant scattering in the spectra is carefully examined. It is shown that the low-energy limit of the total absorption cross section always equal to the area of the non-spherically symmetric horizon, \it i.e. 4π(rH2 + a2) for the brane scalar and 2π2 (rH2 + a2) (rH2 + b2)/rH for the bulk scalar where rH is an horizon radius. The energy amplification for the bulk scalar is roughly order of 10-9 % while that for the brane scalar is order of unity. This indicates that the effect of the superradiance is negligible for the case of the bulk scalar. Thus the standard claim that \it black holes radiate mainly on the brane is not changed although the effect of the superradiance is taken into account. The physical implication of this fac t is discussed in the context of TeV-scale gravity.