Energy-momentum tensor of cosmological fluctuations during inflation
- 2 June 2004
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review D
- Vol. 69 (12) , 123508
- https://doi.org/10.1103/physrevd.69.123508
Abstract
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 for the EMT, the average expansion rate is decreased by the back reaction of cosmological fluctuations.Keywords
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