Remarks on brane-antibrane inflation

TL;DR

This paper reviews the eta problem in brane-antibrane inflation and discusses a supersymmetry-based stabilization mechanism for the volume mode, contributing to theoretical cosmology and string theory models.

Contribution

It introduces a simple stabilization mechanism for the volume mode using nonlinear supersymmetry in brane-antibrane inflation models.

Findings

Proposes a stabilization method compatible with symmetries

Provides insights into the eta problem solution

Contributes to string cosmology modeling

Abstract

We provide an accessible review to the eta problem in brane-antibrane inflation and a recently proposed solution. The description of the antibrane by means of nonlinearly realized supersymmetry suggests a simple stabilization mechanism for the volume mode, based on the most general Kahler and superpotentials compatible with the symmetries of the problem. This work is a contribution to the proceedings of the second general meeting of the COST Action CA21106 (Cosmic WISPers) and is based on arXiv:2410.00097 .