Energy-Momentum Tensor of Cosmological Fluctuations during Inflation
Loading...
Date
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
Description
We study the renormalized energy-momentum tensor (EMT) of cosmological scalar fluctuations during the slow-rollover regime for chaotic inflation with a quadratic potential and find that it is characterized by a negative energy density which grows during slow-rollover. We also approach the back-reaction problem as a second-order calculation in perturbation theory finding no evidence that the back-reaction of cosmological fluctuations is a gauge artifact. In agreement with the results on the EMT, the average expansion rate is decreased by the back-reaction of cosmological fluctuations.
19 pages, no figures.An appendix and references added, conclusions unchanged, version accepted for publication in PRD
19 pages, no figures.An appendix and references added, conclusions unchanged, version accepted for publication in PRD