Linear Perturbations in Brane Gas Cosmology
Scott Watson, Robert Brandenberger
TL;DR
This paper investigates how linear string inhomogeneities affect the stability of Brane Gas Cosmology, finding that the background remains stable and predictions about extra dimension stabilization are robust.
Contribution
It derives the linear perturbation equations in Brane Gas Cosmology with string matter and demonstrates stability against long wavelength fluctuations.
Findings
No instabilities found in long wavelength perturbations
Stability of extra dimensions is maintained
Predictions of Brane Gas Cosmology remain valid
Abstract
We consider the effect of string inhomogeneities on the time dependent background of Brane Gas Cosmology. We derive the equations governing the linear perturbations of the dilaton-gravity background in the presence of string matter sources. We focus on long wavelength fluctuations and find that there are no instabilities. Thus, 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.
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