Relaxing the Cosmological Moduli Problem

TL;DR

This paper explores solutions to the cosmological moduli problem by analyzing how varying the mass parameter C affects the energy density of moduli fields, potentially resolving or relaxing the problem.

Contribution

It demonstrates that the cosmological moduli problem can be mitigated in theories where the parameter C is much greater than or less than one.

Findings

The problem can be solved if C >> 1.

The problem can also be relaxed in models with C << 1.

Moduli fields' energy density can be controlled by adjusting C.

Abstract

Typically the moduli fields acquire mass m =C H in the early universe, which shifts the position of the minimum of their effective potential and leads to an excessively large energy density of the oscillating moduli fields at the later stages of the evolution of the universe. This constitutes the cosmological moduli problem, or Polonyi field problem. We show that the cosmological moduli problem can be solved or at least significantly relaxed in the theories in which C >> 1, as well as in some models with C << 1.