Spectral properties of acoustic black hole radiation: Broadening the horizon

Details Spectral properties of acoustic black hole radiation: Broadening the horizon Spectral properties of acoustic black hole radiation: Broadening the horizon

2010-12-07

arxiv.org/abs/1012.1556v2

Phys.Rev.D83:084010,2011

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

12 pages, 12 figures, revtex4, minor corrections, version accepted on prd

Scientific paper

10.1103/PhysRevD.83.084010

The sensitivity of the black hole spectrum when introducing short distance dispersion is studied in the context of atomic Bose condensates. By considering flows characterized by several length scales, we show that, while the spectrum remains remarkably Planckian, the temperature is no longer fixed by the surface gravity. Rather it is determined by the average of the flow gradient across the horizon over an interval fixed by the healing length and the surface gravity, as if the horizon were broadened. This remains valid as long as the flow does not induce nonadiabatic effects that produce oscillations or some parametric amplification of the flux.

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