Particle production from nonlocal gravitational effective action

Details Particle production from nonlocal gravitational effective action Particle production from nonlocal gravitational effective action

1998-03-23

arxiv.org/abs/gr-qc/9803076v2

Phys.Rev.D60:104045,1999

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

22 pages, LaTeX, no figures. Corrected version with new comments and results. To appear in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.60.104045

In this paper we show how the nonlocal effective action for gravity, obtained after integrating out the matter fields, can be used to compute particle production and spectra for different space-time metrics. Applying this technique to several examples, we find that the perturbative calculation of the effective action up to second order in curvatures yields exactly the same results for the total number of particles as the Bogolyubov transformations method, in the case of masless scalar fields propagating in a Robertson-Walker space-time. Using an adiabatic approximation we also obtain the corresponding spectra and compare the results with the traditional WKB approximation.

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