Curvaton Potential Terms, Scale-Dependent Perturbation Spectra and Chaotic Initial Conditions

McDonald, John (2003) Curvaton Potential Terms, Scale-Dependent Perturbation Spectra and Chaotic Initial Conditions. Journal of Cosmology and Astroparticle Physics, 2003 (12). ISSN 1475-7516

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Abstract

The curvaton scenario predicts an almost scale-invariant spectrum of perturbations in most inflation models. We consider the possibility that renormalizable 4 or Planck scale-suppressed non-renormalizable curvaton potential terms may result in an observable deviation from scale-invariance. We show that if the curvaton initially has a large amplitude and if the total number of e-foldings of inflation is less than about 300 then a running blue perturbation spectrum with an observable deviation from scale-invariance is likely. D-term inflation is considered as an example with a potentially low total number of e-foldings of inflation. A secondary role for the curvaton, in which it drives a period of chaotic inflation leading to D-term or other flat potential inflation from an initially chaotic state, is suggested.

Item Type: Journal Article
Journal or Publication Title: Journal of Cosmology and Astroparticle Physics
Uncontrolled Keywords: /dk/atira/pure/subjectarea/asjc/3100/3103
Subjects:
Departments: Faculty of Science and Technology > Physics
ID Code: 63115
Deposited By: ep_importer_pure
Deposited On: 25 Mar 2013 13:47
Refereed?: Yes
Published?: Published
Last Modified: 22 Jan 2020 02:05
URI: https://eprints.lancs.ac.uk/id/eprint/63115

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