Fröb, Markus BenjaminPapadopoulos, Demetrios B.Roura Crumols, AlbertVerdaguer Oms, Enric, 1950-2014-04-072014-04-0720131550-7998https://hdl.handle.net/2445/53286We 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.19 p.application/pdfeng(c) American Physical Society, 2013Cosmologia quànticaTeoria quàntica de campsGravetat quànticaEquacions de camp d'EinsteinQuantum cosmologyQuantum field theoryQuantum gravityEinstein field equationsinfo:eu-repo/semantics/article6207512014-04-07info:eu-repo/semantics/openAccess