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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 · ORCID
classification gr-qcastro-phhep-th
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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  1. Tensor-Induced Backreaction in Ultra-Slow-Roll Inflation

    astro-ph.CO 2026-08 conditional novelty 6.0 of 10

    Tensor-induced backreaction in ultra-slow-roll inflation limits the drop of the first slow-roll parameter and suppresses the curvature power spectrum peak from roughly 10^-3 to about 4x10^-6, strongly reducing primord...

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