Moduli and multi-field inflation

TL;DR

This paper explores how moduli fields in theories with supersymmetry and extra dimensions can lead to multi-field inflation, affecting primordial fluctuation spectra through isocurvature perturbations.

Contribution

It analyzes the structure of scalar potentials involving moduli and matter fields, highlighting their role in stabilizing moduli and enabling multi-field inflation scenarios.

Findings

Moduli mixing creates potential structures that facilitate stabilization.

Multi-field inflation generates isocurvature perturbations.

Isocurvature effects can alter primordial fluctuation spectra.

Abstract

Moduli with flat or run-away classical potentials are generic in theories based on supersymmetry and extra dimensions. They mix between themselves and with matter fields in kinetic terms and in the nonperturbative superpotentials. As the result, interesting structure appears in the scalar potential which helps to stabilise and trap moduli and leads to multi-field inflation. The new and attractive feature of multi-inflationary setup are isocurvature perturbations which can modify in an interesting way the final spectrum of primordial fluctuations resulting from inflation.