The time factor in the semi-classical approach to the Hawking radiation

Details The time factor in the semi-classical approach to the Hawking radiation The time factor in the semi-classical approach to the Hawking radiation

2009-04-29

arxiv.org/abs/0904.4572v2

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

10 pages, submitted 30/12/2008; v2 minor changes

Scientific paper

The Hawking radiation in the semi-classical approach is re-considered. In the so-called "Angheben method" for the calculation of the imaginary part of the action it was missed the temporal part contribution. This has been recently noticed by Akhmedov et \textsl{al.}, but also there the time part was not properly considered, the sign being reversed. We show that using the semi-classical approach on a fixed background it is not possible to find any tunneling effect from the interior to the exterior of the Schwarzschild black hole. The same critic applies to the derivations which use the Painleve coordinates: also in this procedure it was missed the temporal factor contribution. In this way it is naturally solved also the "factor-two-problem".

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