Racetrack inflation and assisted moduli stabilisation

TL;DR

This paper proposes a racetrack inflation model with natural initial conditions and moduli as inflatons, achieving slow-roll inflation at GUT scale consistent with WMAP data without fine-tuning.

Contribution

It introduces a flux-free racetrack inflation model with automatic initial conditions and moduli-driven slow-roll inflation, avoiding fine-tuning.

Findings

Inflation occurs at near GUT scale.

Scalar perturbation spectrum matches WMAP observations.

Moduli fields serve as natural inflaton candidates.

Abstract

We present a model of inflation based on a racetrack model without flux stabilization. The initial conditions are set automatically through topological inflation. This ensures that the dilaton is not swept to weak coupling through either thermal effects or fast roll. Including the effect of non-dilaton fields we find that moduli provide natural candidates for the inflaton. The resulting potential generates slow-roll inflation without the need to fine tune parameters. The energy scale of inflation must be near the GUT scale and the scalar density perturbation generated has a spectrum consistent with WMAP data.