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Title: Nonperturbative semiclassical stability of de Sitter spacetime for small metric deviations
Author: Fröb, Markus B.
Papadopoulos, D. B.
Roura, Albert
Verdaguer Oms, Enric, 1950-
Keywords: Cosmologia quàntica
Teoria quàntica de camps
Gravetat quàntica
Equacions de camp d'Einstein
Quantum cosmology
Quantum field theory
Quantum gravity
Einstein field equations
Issue Date: 2013
Publisher: American Physical Society
Abstract: We consider the linearized semiclassical Einstein equations for small deviations around de Sitter spacetime including the vacuum polarization effects of conformal fields. Employing the method of order reduction, we find the exact solutions for general metric perturbations (of scalar, vector and tensor type). Our exact (nonperturbative) solutions show clearly that in this case de Sitter is stable with respect to small metric deviations and a late-time attractor. Furthermore, they also reveal a breakdown of perturbative solutions for a sufficiently long evolution inside the horizon. Our results are valid for any conformal theory, even self-interacting ones with arbitrarily strong coupling.
Note: Reproducció del document publicat a:
It is part of: Physical Review D, 2013, vol. 87, p. 064019-1-064019-19
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ISSN: 1550-7998
Appears in Collections:Articles publicats en revistes (Física de la Matèria Condensada)

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