Moduli inflation in five-dimensional supergravity models

TL;DR

This paper presents a simple mechanism for realizing inflation within five-dimensional supergravity models, using moduli fields as inflatons and a straightforward stabilization potential, compatible with current observational data.

Contribution

It introduces a novel, simple moduli stabilization approach enabling successful inflation in 5D supergravity models, addressing the eta problem.

Findings

Achieves inflation consistent with WMAP, Planck, BICEP2 data

Uses a simple moduli stabilization potential

Addresses cosmological moduli problem

Abstract

We propose a simple but effective mechanism to realize an inflationary early universe consistent with the observed WMAP, Planck and/or BICEP2 data, which would be incorporated in various supersymmetric models of elementary particles constructed in the (effective) five-dimensional spacetime. In our scenario, the inflaton field is identified with one of the moduli appearing when the fifth direction is compactified, and a successful cosmological inflation without the so-called eta problem can be achieved by a very simple moduli stabilization potential. We also discuss the related particle cosmology during and (just) after the inflation, such as the (no) cosmological moduli problem.