Instability of 1-loop superstring cosmology

TL;DR

This paper analyzes the stability of a non-singular superstring cosmological solution at 1-loop level, revealing an instability in graviton modes linked to initial singularity avoidance, and estimates conditions for background breakdown.

Contribution

It provides the first stability analysis of a non-singular superstring cosmology solution at 1-loop, identifying graviton mode instability and its implications.

Findings

Identified graviton mode instability in the solution.

Linked instability to initial singularity avoidance.

Estimated conditions for background breakdown due to graviton dominance.

Abstract

A stability analysis is made in the context of the previously discovered non-singular cosmological solution from 1-loop corrected superstring effective action. We found that this solution has an instability in graviton mode, which is shown to have a close relation to the avoidance of initial singularity via energy condition. We also estimate the condition for the breakdown of the background solution due to the overdominance of the graviton.