Singularity-free cosmological solutions in string theories

TL;DR

This paper demonstrates that string theories with more than 10 dimensions and brane configurations can produce singularity-free cosmological solutions with regular dilaton behavior, smoothly transitioning to standard cosmology.

Contribution

It introduces a new class of singularity-free cosmological solutions in string theories incorporating branes and higher dimensions.

Findings

Solutions are free of singularities in higher-dimensional string models.

Dilaton field remains regular throughout the evolution.

The models exhibit a smooth transition to a radiative phase similar to standard cosmology.

Abstract

Singularity-free cosmological solutions may be obtained from the string action at tree level if the dimension of the space-time is greater than 10 and if brane configurations are taken into account. The behaviour of the dilaton field in this case is also regular. Asymptotically a radiative phase is attained indicating a smooth transition to the standard cosmological model.