Stability of de Sitter spacetime under isotropic perturbations in semiclassical gravity
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 fo...
| Authors: | , , |
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| Format: | article |
| Status: | Published version |
| Publication Date: | 2008 |
| Country: | España |
| Institution: | Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya) |
| Repository: | Recercat. Dipósit de la Recerca de Catalunya |
| OAI Identifier: | oai:recercat.cat:2445/12385 |
| Online Access: | https://hdl.handle.net/2445/12385 |
| Access Level: | Open access |
| Keyword: | 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 |
| Summary: | 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. |
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