Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2009-06-09
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
Standard Latex document, typos corrected, refined discussion of tunneling picture, subsection 5.1 removed
Scientific paper
Previous work on dynamical black hole instability is further elucidated within the Hamilton-Jacobi method for horizon tunneling and the reconstruction of the classical action by means of the null-expansion method. Everything is based on two natural requirements, namely that the tunneling rate is an observable and therefore it must be based on invariantly defined quantities, and that coordinate systems which do not cover the horizon should not be admitted. These simple observations can help to clarify some ambiguities, like the doubling of the temperature occurring in the static case when using singular coordinates, and the role, if any, of the temporal contribution of the action to the emission rate. The formalism is also applied to FRW cosmological models, where it is observed that it predicts the positivity of the temperature naturally, without further assumptions on the sign of the energy.
Criscienzo Roberto Di
Hayward Sean A.
Nadalini Mario
Vanzo Luciano
Zerbini Sergio
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