Non-Gaussianity from massless preheating

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dc.creatorChambers, Alex
dc.creatorRajantie, Arttu
dc.date2008-05-30
dc.date2008-09-30
dc.date.accessioned2026-07-07T10:05:55Z
dc.date.available2026-07-07T10:05:55Z
dc.descriptionPreheating can convert superhorizon fluctuations of light scalar fields present at the end of inflation into observable density perturbations. We show in detail how lattice field theory simulations and the separate universes approximation can be used to calculate these perturbations and make predictions for the nonlinearity parameter fNL . We also present a simple approximation scheme that can reproduce these results analytically. Applying these methods to the massless preheating model, we determine the parameter values that are ruled out by too high levels of non-Gaussianity.
dc.description26 pages, 9 figures, 1 table; erratum added
dc.identifierhttps://arxiv.org/abs/0805.4795
dc.identifierhttp://arxiv.org/abs/0805.4795
dc.identifierJCAP 08 (2008) 002
dc.identifierdoi:10.1088/1475-7516/2008/08/002
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/170156
dc.subjectAstrophysics
dc.subjectHigh Energy Physics - Phenomenology
dc.titleNon-Gaussianity from massless preheating
dc.typetext

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