Curvaton scenarios with inflaton decays into curvatons

Byrnes, Christian T, Cortês, Marina and Liddle, Andrew R (2016) Curvaton scenarios with inflaton decays into curvatons. Physical Review D, 94 (6). 063525-1-063525-9. ISSN 2470-0010

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We consider the possible decay of the inflaton into curvaton particles during reheating and analyze its effect on curvaton scenarios. Typical decay curvatons are initially relativistic then become nonrelativistic, changing the background history of the Universe. We show that this change to the background is the only way in which observational predictions of the scenario are modified. Moreover, once the required amplitude of perturbations is fixed by observation there are no signatures of such decays in other cosmological observables. The decay curvatons can prevent the Universe from becoming dominated by the curvaton condensate, making it impossible to match observations in parts of parameter space. This constrains the branching ratio of the inflaton to curvaton to be less than of order 0.1 typically. If the branching ratio is below about 10−4 it has negligible impact on the model parameter space and can be ignored.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Research Centres and Groups: Astronomy Centre
Subjects: Q Science > QB Astronomy
Depositing User: Richard Chambers
Date Deposited: 12 Jan 2017 15:32
Last Modified: 09 Mar 2017 17:04

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