A No-Go Theorem in String Cosmology

TL;DR

This paper reviews a no-go theorem in string cosmology, demonstrating that certain string theory mechanisms cannot resolve the graceful exit problem in Pre-Big-Bang inflation, thus maintaining singularities.

Contribution

It provides a critical analysis showing that dilaton self-interactions, string fluids, and higher genus corrections cannot enable branch changing to avoid singularities in string cosmology.

Findings

Dilaton self-interactions fail to facilitate branch change.

String fluid sources do not enable graceful exit.

Higher genus corrections are ineffective in inducing graceful exit.

Abstract

A no-go theorem pertaining to the graceful exit problem in Pre-Big-Bang inflation is reviewed. It is shown that dilaton self-interactions and string fluid sources fail to facilitate branch changing necessary to avoid singularities. A comment on the failure of the higher genus corrections to induce graceful exit is also included.