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Stability of de Sitter spacetime under isotropic perturbations in semiclassical gravity
Pérez-Nadal, Guillem; Roura, Albert; Verdaguer Oms, Enric, 1950-
Universitat de Barcelona
A spatially flat Robertson-Walker spacetime driven by a cosmological constant is nonconformally coupled to a massless scalar field. The equations of semiclassical gravity are explicitly solved for this case, and a self-consistent de Sitter solution associated with the Bunch-Davies vacuum state is found (the effect of the quantum field is to shift slightly the effective cosmological constant). Furthermore, it is shown that the corrected de Sitter spacetime is stable under spatially isotropic perturbations of the metric and the quantum state. These results are independent of the free renormalization parameters.
2010-05-11
Relativitat general (Física)
Gravetat quàntica
Cosmologia
Pertorbació (Dinàmica quàntica)
Teoria quàntica de camps
General relativity (Physics)
Quantum gravity
Cosmology
Perturbation (Quantum dynamics)
Quantum field theory
(c) The American Physical Society, 2008
Article
The American Physical Society
         

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