UV Perturbations in Brane Gas Cosmology

TL;DR

This paper investigates how short wavelength modes affect Brane Gas Cosmology, showing that UV modes do not disrupt the background evolution or the stabilization of extra dimensions, confirming the robustness of the model.

Contribution

It demonstrates that UV perturbations do not significantly alter the background or stability in Brane Gas Cosmology, validating its resilience against linear perturbations.

Findings

String matter sources are negligible in the UV regime.

Linear perturbations are well-behaved and stable.

Moduli stabilization remains valid with perturbations.

Abstract

We consider the effect of the ultraviolet (UV) or short wavelength modes on the background of Brane Gas Cosmology. We find that the string matter sources are negligible in the UV and that the evolution is given primarily by the dilaton perturbation. We also find that the linear perturbations are well behaved and the predictions of Brane Gas Cosmology are robust against the introduction of linear perturbations. In particular, we find that the stabilization of the extra dimensions (moduli) remains valid in the presence of dilaton and string perturbations.