On T-Duality in Brane Gas Cosmology

TL;DR

This paper explores how T-duality symmetry extends to brane gas cosmology within dilaton gravity, supporting the idea that such models can lead to a nonsingular universe evolution.

Contribution

It demonstrates that the nonsingular cosmological evolution arguments based on T-duality remain valid when extended from string gases to brane gases.

Findings

T-duality applies to brane gas cosmology

Nonsingular evolution persists with brane gases

Supports string theory-based cosmological models

Abstract

In the context of homogeneous and isotropic superstring cosmology, the T-duality symmetry of string theory has been used to argue that for a background space-time described by dilaton gravity with strings as matter sources, the cosmological evolution of the Universe will be nonsingular. In this Letter we discuss how T-duality extends to brane gas cosmology, an approximation in which the background space-time is again described by dilaton gravity with a gas of branes as a matter source. We conclude that the arguments for nonsingular cosmological evolution remain valid.