Particle production from nonlocal gravitational effective action



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Dobado González, Antonio and López Maroto, Antonio (1999) Particle production from nonlocal gravitational effective action. Physical Review D , 60 (10). ISSN 0556-2821

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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 End 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 massless scaler 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. [S0556-2821(99)02920-3].

Item Type:Article
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©1999 The American Physical Society.
A.L.M acknowledges support from SEUID-Royal Society. This work has been partially supported by Ministerio de Educación y Ciencia (Spain) CICYT (AEN96-1634).

Uncontrolled Keywords:Covariant Perturbation-Theory; Loop Effective Action; Early Universe; Inflation; Anisotropy; Field
Subjects:Sciences > Physics
ID Code:22709
Deposited On:10 Sep 2013 14:39
Last Modified:07 Feb 2014 10:50

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