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oai:recercat.cat:2445/532862025-12-04T20:43:26Zcom_2072_1057col_2072_478822col_2072_478917

00925njm 22002777a 4500 dc Fröb, Markus Benjamin author Papadopoulos, Demetrios B. author Roura Crumols, Albert author Verdaguer Oms, Enric, 1950- author 2014-04-07T08:21:16Z 2014-04-07T08:21:16Z 2013 2014-04-07T08:21:16Z 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. Cosmologia quàntica Teoria quàntica de camps Gravetat quàntica Equacions de camp d'Einstein Quantum cosmology Quantum field theory Quantum gravity Einstein field equations Nonperturbative semiclassical stability of de Sitter spacetime for small metric deviations