Particle production from nonlocal gravitational effective action | Zendy

Antonio Dobado | Zendy; Antonio L. Maroto | Zendy

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Particle production from nonlocal gravitational effective action

Author(s) -

Antonio Dobado,

Antonio L. Maroto

Publication year - 1999

Publication title -

physical review. d. particles, fields, gravitation, and cosmology/physical review. d. particles and fields

Language(s) - English

Resource type - Journals

eISSN - 1089-4918

pISSN - 0556-2821

DOI - 10.1103/physrevd.60.104045

Subject(s) - wkb approximation , massless particle , action (physics) , effective action , physics , adiabatic process , scalar (mathematics) , space (punctuation) , gravitation , gravitational field , classical mechanics , particle (ecology) , spectral line , mathematical physics , mathematics , quantum mechanics , computer science , geometry , oceanography , geology , operating system

In this paper we show how the nonlocal effective action for gravity, obtainedafter integrating out the matter fields, can be used to compute particleproduction and spectra for different space-time metrics. Applying thistechnique to several examples, we find that the perturbative calculation of theeffective action up to second order in curvatures yields exactly the sameresults for the total number of particles as the Bogolyubov transformationsmethod, in the case of masless scalar fields propagating in a Robertson-Walkerspace-time. Using an adiabatic approximation we also obtain the correspondingspectra and compare the results with the traditional WKB approximation.Comment: 22 pages, LaTeX, no figures. Corrected version with new comments and results. To appear in Phys. Rev.

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