Moduli Inflation from Dynamical Supersymmetry Breaking

TL;DR

This paper proposes a model where moduli fields in supersymmetric theories drive inflation through a potential linked to dynamical SUSY breaking, naturally producing small density fluctuations and a zero cosmological constant after inflation.

Contribution

It introduces a novel inflationary scenario where moduli fields and dynamical SUSY breaking interact, avoiding fine-tuning and achieving natural reheating and cosmological constant cancellation.

Findings

Density fluctuations depend on SUSY breaking scale

Small fluctuations achieved without fine tuning

SUSY restored at potential minimum, zero cosmological constant

Abstract

Moduli fields, which parameterize perturbative flat directions of the potential in supersymmetric theories, are natural candidates to act as inflatons. An inflationary potential on moduli space can result if the scale of dynamical SUSY breaking in some sector of the theory is determined by a moduli dependent coupling. The magnitude of density fluctuations generated during inflation then depends on the scale of SUSY breaking in this sector. This can naturally be hierarchically smaller than the Planck scale in a dynamical model, giving small fluctuations without any fine tuning of parameters. It is also natural for SUSY to be restored at the minimum of the moduli potential, and to leave the universe with zero cosmological constant after inflation. Acceptable reheating can also be achieved in this scenario.