Energy-Momentum Tensor of Cosmological Fluctuations during Inflation

Details Energy-Momentum Tensor of Cosmological Fluctuations during Inflation Energy-Momentum Tensor of Cosmological Fluctuations during Inflation

2003-10-16

arxiv.org/abs/gr-qc/0310086v3

Phys.Rev.D69:123508,2004

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

19 pages, no figures.An appendix and references added, conclusions unchanged, version accepted for publication in PRD

Scientific paper

10.1103/PhysRevD.69.123508

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.

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