Strong dynamics at the Planck scale as a solution to the cosmological moduli problem

TL;DR

The paper proposes that strong dynamics at the Planck scale can resolve the cosmological moduli problem, influencing inflation models and predicting focus point supersymmetry within certain frameworks.

Contribution

It introduces a novel solution involving Planck-scale strong dynamics and identifies specific inflation models that are compatible with this mechanism.

Findings

Multi-field inflation is necessary for the mechanism to work.

Chaotic inflation with a discrete symmetry avoids related problems.

Focus point supersymmetry emerges in the Polonyi model context.

Abstract

We argue that strong dynamics at the Planck scale can solve the cosmological moduli problem. We discuss its implications for inflation models, and find that a certain type of multi-field inflation model is required for this mechanism to work, since otherwise it would lead to the serious eta-problem. Combined with the inflaton-induced gravitino problem, we show that a chaotic inflation with a discrete symmetry naturally avoids both problems. Interestingly, the focus point supersymmetry is predicted when this mechanism is applied to the Polonyi model.