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WMAP, neitrino degeneracy and non-Gaussianity contraints on, isocurvature perturbations in the curvaton model of inflation.

Gordon, Christopher and Malik, Karim A. (2004) WMAP, neitrino degeneracy and non-Gaussianity contraints on, isocurvature perturbations in the curvaton model of inflation. Physical Review, 69 (6). 063508. ISSN 0556-2821

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Abstract

In the curvaton model of inflation, where a second scalar field, the “curvaton,” is responsible for the observed inhomogeneity, a nonzero neutrino degeneracy may lead to a characteristic pattern of isocurvature perturbations in the neutrino, cold dark matter and baryon components. We find that the current data can only place upper limits on the level of isocurvature perturbations. These can be translated into upper limits on the neutrino degeneracy parameter. In the case that lepton number is created before curvaton decay, we find that the limit on the neutrino degeneracy parameter is comparable with that obtained from big-bang nucleosynthesis. For the case that lepton number is created by curvaton decay we find that the absolute value of the non-Gaussianity parameter, |fnl|, must be less than 10 (95% confidence interval).

Item Type: Article
Journal or Publication Title: Physical Review
Subjects: Q Science > QC Physics
Departments: Faculty of Science and Technology > Physics
ID Code: 23925
Deposited By: ep_ss_importer
Deposited On: 24 Feb 2009 08:59
Refereed?: Yes
Published?: Published
Last Modified: 26 Jul 2012 16:18
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/23925

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