Solving the Graceful Exit Problem in Superstring Cosmology

TL;DR

This paper addresses the graceful exit problem in superstring cosmology by demonstrating a quantum-corrected solution in two-dimensional dilaton gravity that works regardless of the number of scalar matter fields.

Contribution

It introduces a one-loop quantum correction approach that resolves the graceful exit problem for any finite matter fields, extending previous solutions.

Findings

Quantum corrections enable a solution to the graceful exit problem.

The solution is valid for any finite number of scalar matter fields.

The approach parallels and extends Rey's recent proposal.

Abstract

We briefly review the status of the ``graceful exit'' problem in superstring cosmology and present a possible resolution. It is shown that there exists a solution to this problem in two-dimensional dilaton gravity provided quantum corrections are incorporated. This is similar to the recently proposed solution of Rey. However, unlike in his case, in our one-loop corrected model the graceful exit problem is solved for any finite number of massless scalar matter fields present in the theory.