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The inflating curvaton

Dimopoulos, Konstantinos and Kohri, Kazunori and Lyth, David and Matsuda, Tomohiro (2012) The inflating curvaton. Journal of Cosmology and Astroparticle Physics, 03. 0-8. ISSN 1475-7516

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    Abstract

    The primordial curvature perturbation zeta may be generated by some curvaton field sigma, which is negligible during inflation and has more or less negligible interactions until it decays. In the current scenario, the curvaton starts to oscillate while its energy density rho_sigma is negligible. We explore the opposite scenario, in which rho_sigma drives a few e-folds of inflation before the oscillation begins. In this scenario for generating zeta it is exceptionally easy to solve the eta-problem; one just has to make the curvaton a string axion, with anomaly-mediated susy breaking which may soon be tested at the LHC. The observed spectral index n can be obtained with a potential V~phi^p for the first inflation; p = 1 or 2 is allowed by the current uncertainty in n but the improvement in accuracy promised by Planck may rule out p = 1. The predictions include (i) running n'= 0.0026 (0.0013) for p = 1 (2) that will probably be observed, (ii) non-gaussianity parameter fNL ~ −1 that may be observed, (iii) tensor fraction r is probably too small to ever observed.

    Item Type: Article
    Journal or Publication Title: Journal of Cosmology and Astroparticle Physics
    Subjects: Q Science > QC Physics
    Departments: Faculty of Science and Technology > Physics
    ID Code: 53541
    Deposited By: ep_importer_pure
    Deposited On: 18 Apr 2012 11:42
    Refereed?: Yes
    Published?: Published
    Last Modified: 09 Apr 2014 23:19
    Identification Number:
    URI: http://eprints.lancs.ac.uk/id/eprint/53541

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