Late-time expansion in the semiclassical theory of the Hawking radiation

Details Late-time expansion in the semiclassical theory of the Hawking radiation Late-time expansion in the semiclassical theory of the Hawking radiation

2011-07-17

arxiv.org/abs/1107.3312v2

Physics

High Energy Physics

High Energy Physics - Theory

17 pages, 1 figure, LaTex, typos corrected, one intermediate formula added

Scientific paper

We give a detailed treatment of the back-reaction effects on the Hawking spectrum in the late-time expansion within the semiclassical approach to the Hawking radiation. We find that the boundary value problem defining the action of the modes which are regular at the horizon admits in general the presence of caustics. We show that for radii less that a certain critical value $r_c$ no caustic occurs for all values of the wave number and time and we give a rigorous lower bound on such a critical value. We solve the exact system of non linear equations defining the motion, by an iterative procedure rigorously convergent at late times. The first two terms of such an expansion give the $O(\omega/M)$ correction to the Hawking spectrum.

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