Mixed inflaton and curvaton scenario with sneutrinos
arXiv:1206.4944 · doi:10.1088/1475-7516/2012/10/015
Abstract
A variation of sneutrino inflation based on chi^2 potential is considered where the inflaton and the late-decaying field are sneutrinos of different generations. The lighter, late-decaying sneutrino dilutes the gravitinos over-produced after inflaton decay and generates the matter asymmetry. It can also significantly contribute to the curvature perturbation, realizing the mixed inflaton-curvaton case. The cosmic microwave background (CMB) observables can distinguish this case from inflation with chi^2 potential, provided that the initial value of the late-decaying sneutrino is either an order of magnitude smaller or larger than the reduced Planck scale.
1+15 pages, 3 figures, 1 table. v2: minor revision, references added. v3: removed a remark on the decoupling of a RH neutrino from the conclusion, added some explanations and references, matches version accepted by JCAP
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