Energy-Momentum Tensor of Cosmological Fluctuations during Inflation

F. Finelli; G. Marozzi; G. P. Vacca; G. Venturi

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Energy-Momentum Tensor of Cosmological Fluctuations during Inflation

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arxiv gr-qc/0310086 v3 pith:JCQIK5D2 submitted 2003-10-16 gr-qc astro-phhep-th

F. Finelli , G. Marozzi , G. P. Vacca , G. Venturi This is my paper

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keywords cosmologicalfluctuationsback-reactionduringenergy-momentuminflationslow-rollovertensor

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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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