Multi-field inflation from a higher derivative N = 1 Supergravity model

TL;DR

This paper explores a supergravity model that allows for ghost-free, two-field slow roll inflation, with cosmological parameters closely matching those of the Starobinsky model, including higher derivative effects.

Contribution

It introduces a higher derivative N=1 supergravity model that is dual to a scalar field theory, enabling ghost-free two-field inflation with realistic cosmological parameters.

Findings

The model admits slow roll, two-field inflation solutions.

Cosmological parameters are within acceptable observational ranges.

Corrections to the Starobinsky model are of order lnN/N.

Abstract

We study the cosmological evolution of a N = 1 supergravity model, dual to a higher derivative supergravity model coupled to scalar fields so that in the Einstein frame the model is ghost free. We find that this model admit slow roll inflationary solutions showing essentially two-field inflation. The cosmological parameters calculated for this model lie in acceptable range with corrections of the order lnN/N, N being the number of e-foldings, compared to the Starobinsky inflation model.