Back-reaction of Cosmological Fluctuations during Power-Law Inflation

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dc.creatorMarozzi, G.
dc.date2006-12-22
dc.date2007-08-03
dc.date.accessioned2026-07-07T11:01:32Z
dc.date.available2026-07-07T11:01:32Z
dc.descriptionWe study the renormalized energy-momentum tensor of cosmological scalar fluctuations during the slow-rollover regime for power-law inflation and find that it is characterized by a negative energy density at the leading order, with the same time behaviour as the background energy. The average expansion rate appears decreased by the back-reaction of the effective energy of cosmological fluctuations, but this value is comparable with the energy of background only if inflation starts at a Planckian energy. We also find that, for this particular model, the first and second order inflaton fluctuations are decoupled and satisfy the same equation of motion. To conclude, the fourth order adiabatic expansion for the inflaton scalar field is evaluated for a general potential V(ϕ).
dc.description9 pages, no figures, revtex. Some changes made, comments and references added, conclusions unchanged, version accepted for pubblication in Phys. Rev. D
dc.identifierhttps://arxiv.org/abs/gr-qc/0612148
dc.identifierhttp://arxiv.org/abs/gr-qc/0612148
dc.identifierPhys.Rev.D76:043504,2007
dc.identifierdoi:10.1103/PhysRevD.76.043504
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/187979
dc.subjectGeneral Relativity and Quantum Cosmology
dc.subjectAstrophysics
dc.subjectHigh Energy Physics - Theory
dc.titleBack-reaction of Cosmological Fluctuations during Power-Law Inflation
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