Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2009-03-12
Phys.Rev.D79:124008,2009
Physics
High Energy Physics
High Energy Physics - Theory
revtex4, 21 pages, 24 figures;v2: 3 figs added, 1 replaced, approximations better justified, refs added;v3: typos fixed, refs
Scientific paper
10.1103/PhysRevD.79.124008
We study the fluxes emitted by black holes when using dispersive field theories. We work with stationary one dimensional backgrounds which are asymptotically flat on both sides of the horizon. The asymptotic fluxes are governed by a 3x3 Bogoliubov transformation. The fluxes emitted by the corresponding white holes are regular and governed by the inverse transformation. We numerically compute the spectral properties of these fluxes for both sub- and superluminal quartic dispersion. The leading deviations with respect to the dispersionless flux are computed and shown to be governed by a critical frequency above which there is no radiation. Unlike the UV scale governing dispersion, its value critically depends on the asymptotic properties of the background. We also study the flux outside the robust regime. In particular we show that its low frequency part remains almost thermal but with a temperature which significantly differs from the standard one. Application to four dimensional black holes and Bose-Einstein condensates are in preparation.
Macher Jean
Parentani Renaud
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