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Title: Semiclassical equations for weakly inhomogeneous cosmologies
Author: Campos, Antonio
Verdaguer Oms, Enric, 1950-
Keywords: Cosmologia
Relativitat general (Física)
Teoria quàntica de camps
Equacions d'Einstein
Materials inhomogenis
General relativity (Physics)
Quantum field theory
Einstein field equations
Inhomogeneous materials
Issue Date: 1994
Publisher: The American Physical Society
Abstract: The in-in effective action formalism is used to derive the semiclassical correction to Einsteins equations due to a massless scalar quantum field conformally coupled to small gravitational perturbations in spatially flat cosmological models. The vacuum expectation value of the stress tensor of the quantum field is directly derived from the renormalized in-in effective action. The usual in-out effective action is also discussed and it is used to compute the probability of particle creation. As one application, the stress tensor of a scalar field around a static cosmic string is derived and the back-reaction effect on the gravitational field of the string is discussed.
Note: Reproducció digital del document publicat en format paper, proporcionada per PROLA i
It is part of: Physical Review D, 1994, vol. 49, núm. 4, p. 1861-1880
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ISSN: 0556-2821
Appears in Collections:Articles publicats en revistes (Física de la Matèria Condensada)

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