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A numerical study of non-Gaussianity in the curvaton scenario

Malik, K. A. and Lyth, D. H. (2006) A numerical study of non-Gaussianity in the curvaton scenario. Journal of Cosmology and Astroparticle Physics.

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Abstract

We study the curvaton scenario using gauge-invariant second order perturbation theory and solving the governing equations numerically. Focusing on large scales we calculate the non-linearity parameter fNL in the two-fluid curvaton model and compare our results with previous analytical studies employing the sudden decay approximation. We find good agreement of the two approaches for large curvaton energy densities at curvaton decay, Ωσdec, but significant differences of up to 10% for small Ωσdec.

Item Type: Article
Journal or Publication Title: Journal of Cosmology and Astroparticle Physics
Uncontrolled Keywords: cosmological perturbation theory ; inflation
Subjects:
Departments: Faculty of Science and Technology > Physics
ID Code: 9630
Deposited By: Mr Michael Dunne
Deposited On: 17 Jun 2008 12:26
Refereed?: Yes
Published?: Published
Last Modified: 26 Jul 2012 18:40
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/9630

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