On T-duality in brane gas cosmology

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 paper 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.