On Quantum Radiation in Curved Spacetime

Details On Quantum Radiation in Curved Spacetime On Quantum Radiation in Curved Spacetime

2002-04-06

arxiv.org/abs/hep-th/0204060v2

Gen.Rel.Grav. 37 (2005) 857-872

Physics

High Energy Physics

High Energy Physics - Theory

18 pages, revised lengthy version

Scientific paper

10.1007/s10714-005-0072-5

In the context of quantum field theories in curved spacetime, we compute the effective action of the transition amplitude from vacuum to vacuum in the presence of an external gravitational field. The imaginary part of resulted effective action determines the probability of vacuum decay via quantum tunneling process, giving the rate and spectrum of particle creations. We show that gravitational field polarizes vacuum and discretizes its spectrum for such a polarization gains gravitational energy. On the basis of gravitational vacuum polarization, we discuss the quantum origin of vacuum decay in curved spacetime as pair-creations of particles and anti-particles. The thermal spectrum of particle creations is attributed to (i) the CPT invariance of pair-creations(annihilations) from(into) vacuum and (ii) vacuum acts as a reserve with the temperature determined by gravitational energy-gain.

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