Abstract
Inflationary models based on a single scalar field ϕ with a quadratic potential V = ½m2ϕ2are disfavoured by the recent Planck constraints on the scalar index, ns, and the tensor-to-scalar ratiofor cosmological density perturbations, rT. In this paper westudy how such a quadratic inflationary model can be rescued by postulating additional fields withquadratic potentials, such as might occur in sneutrino models, which might serve as eithercurvatons or supplementary inflatons. Introducing a second scalar field reduces but does notremove the pressure on quadratic inflation, but we find a sample of three-field models thatare highly compatible with the Planck data on ns and rT. We exhibit a specific three-sneutrino example that isalso compatible with the data on neutrino mass difference and mixing angles.
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