Berlin 2005 – scientific programme
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MP: Theoretische und Mathematische Grundlagen der Physik
MP 8: Quantum Gravity
MP 8.3: Fachvortrag
Wednesday, March 9, 2005, 14:40–15:00, TU MA043
On the Universality of the Hawking Effect — •Ralf Schützhold1 and William G. Unruh2 — 1TU Dresden — 2UBC Vancouver, Canada
Addressing the question of whether the Hawking effect depends on degrees of freedom at ultra-high (e.g., Planckian) energies/momenta, we propose three rather general conditions on these degrees of freedom under which the Hawking effect is reproduced to lowest order. As a generalization of Corley’s results, we present a rather general model based on non-linear dispersion relations satisfying these conditions together with a derivation of the Hawking effect for that model. However, we also demonstrate counter-examples, which do not appear to be unphysical or artificial, displaying strong deviations from Hawking’s result. Therefore, whether real black holes emit Hawking radiation remains an open question and could give non-trivial information about Planckian physics.