Quantum Stability of a w < - 1 Phase of Cosmic Acceleration
| dc.creator | Kahya, E. O. | |
| dc.creator | Onemli, V. K. | |
| dc.date | 2006-12-04 | |
| dc.date | 2007-08-15 | |
| dc.date.accessioned | 2026-07-07T11:21:35Z | |
| dc.date.available | 2026-07-07T11:21:35Z | |
| dc.description | We consider a massless, minimally coupled scalar with a quartic self-interaction which is released in Bunch-Davies vacuum in locally de Sitter background of an inflating universe. It was shown, in this system, that quantum effects can induce a temporary phase of super-acceleration causing a violation of the Weak Energy Condition on cosmological scales. In this paper we investigate the system's stability by studying the behavior of linearized perturbations in the quantum-corrected effective field equation at one and two-loop order. We show that the time dependence we infer from the quantum-corrected mode function is in perfect agreement with the system developing a positive mass squared. The maximum induced mass remains perturbatively small and it does not go tachyonic. Thus, the system is stable. | |
| dc.description | 23 pages | |
| dc.identifier | https://arxiv.org/abs/gr-qc/0612026 | |
| dc.identifier | http://arxiv.org/abs/gr-qc/0612026 | |
| dc.identifier | Phys.Rev.D76:043512,2007 | |
| dc.identifier | doi:10.1103/PhysRevD.76.043512 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/194303 | |
| dc.subject | General Relativity and Quantum Cosmology | |
| dc.subject | Astrophysics | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.subject | High Energy Physics - Theory | |
| dc.title | Quantum Stability of a w < - 1 Phase of Cosmic Acceleration | |
| dc.type | text |