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Rescuing Quadratic Inflation · Around

2013

Rescuing Quadratic Inflation

Ellis, John, Fairbairn, Malcolm, Sueiro, Maria

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Inflationary models based on a single scalar field $\phi$ with a quadratic potential $V = \frac{1}{2} m^2 \phi^2$ are disfavoured by the recent Planck constraints on the scalar index, $n_s$, and the tensor-to-scalar ratio for cosmological density perturbations, $r_T$.

In this paper we study how such a quadratic inflationary model can be rescued by postulating additional fields with quadratic potentials, such as might occur in sneutrino models, which might serve as either curvatons or supplementary inflatons.
Introducing a second scalar field reduces but does not remove the pressure on quadratic inflation, but we find a sample of three-field models that are highly compatible with the Planck data on $n_s$ and $r_T$.
We exhibit a specific three-sneutrino example that is also compatible with the data on neutrino mass difference and mixing angles.

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