Resurrecting Quartic and Quadratic inflaton potentials in two-field inflationary model

TL;DR

This paper proposes a two-field inflationary model that revives simple quartic and quadratic potentials, aligning them with observational data by introducing an assisting scalar field, while avoiding isocurvature and non-Gaussian perturbations.

Contribution

It demonstrates that simple inflationary potentials can be compatible with observations through a two-field setup that produces no isocurvature perturbations and negligible non-Gaussianity, and can be realized in SUGRA.

Findings

Simple potentials evaded observational constraints

No isocurvature perturbations produced

Model compatible with SUGRA framework

Abstract

After the release of the PLANCK data, it is evident that inflationary paradigm has stood the test of time. Even though, it is difficult to realise inflationary paradigm in a particle physics model as the present observations have ruled out the simplest quartic and quadratic inflationary potentials, which generically arise in particle physics. We would show that such simplest inflationary potentials can evade discrepancies with observations, if the inflaton field is assisted by another scalar during inflation. Moreover, unlike other multifield models, our model yields no isocurvature perturbations and negligible non-Gaussianity, making it more compatible with the present data. Above all, our model can also be realised in the framework of SUGRA.