On the generation of a non-gaussian curvature perturbation during preheating

The perturbation of a light field might affect preheating and hence generate a contribution to the spectrum and non-gaussianity of the curvature perturbation Delta *z. The field might appear directly in the preheating model (curvaton-type preheating) or indirectly through its effect on a mass or cou...

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Published inJournal of cosmology and astroparticle physics Vol. 2010; no. 2; p. 023
Main Authors Kohri, Kazunori, Lyth, David H, Valenzuela-Toledo, Cesar A
Format Journal Article
LanguageEnglish
Published United States IOP Publishing 01.02.2010
Subjects
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
CHAOS THEORY
COMPUTERIZED SIMULATION
COSMOLOGY
COUPLING
DISTURBANCES
INFLATIONARY UNIVERSE
INFLATONS
VISIBLE RADIATION
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Summary:The perturbation of a light field might affect preheating and hence generate a contribution to the spectrum and non-gaussianity of the curvature perturbation Delta *z. The field might appear directly in the preheating model (curvaton-type preheating) or indirectly through its effect on a mass or coupling (modulated preheating). We give general expressions for Delta *z based on the Delta *dN formula, and apply them to the cases of quadratic and quartic chaotic inflation. For the quadratic case, curvaton-type preheating is ineffective in contributing to Delta *z, but modulated preheating can be effective. For quartic inflation, curvaton-type preheating may be effective but the usual Delta *dN formalism has to be modified. We see under what circumstances the recent numerical simulation of Bond et al. [0903.3407] may be enough to provide a rough estimate for this case. Keywords->
Bibliography:ObjectType-Article-2
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ISSN:1475-7516
1475-7516
DOI:10.1088/1475-7516/2010/02/023