Late time evolution of brane gas cosmology and compact internal dimensions

TL;DR

This paper explores the late-time evolution of a universe in brane gas cosmology, focusing on how internal dimensions are compactified by branes and how anisotropic wrapping influences cosmic dynamics.

Contribution

It derives Friedman-like equations for anisotropically wrapped dimensions in brane gas cosmology, highlighting the role of higher-dimensional branes in internal space compactification.

Findings

Internal dimensions are wrapped by three or higher dimensional branes.

Derived equations describe the dynamics of wrapped and unwrapped subvolumes.

Internal dimensions tend to remain compactified due to brane wrapping.

Abstract

We study the late-time behavior of a universe in the framework of brane gas cosmology. We investigate the evolution of a universe with a gas of supergravity particles and a gas of branes. Considering the case when different dimensions are anisotropically wrapped by various branes, we have derived Friedman-like equations governing the dynamics of wrapped and unwrapped subvolumes. We point out that the compact internal dimensions are wrapped by three or higher dimensional branes.