String Gas Cosmology and Non-Gaussianities
High Energy Physics - Theory
2008-03-05 v2
Abstract
Recently it has been shown that string gas cosmology, an alternative model of the very early universe which does not involve a period of cosmological inflation, can give rise to an almost scale invariant spectrum of metric perturbations. Here we calculate the non-Gaussianities of the spectrum of cosmological fluctuations in string gas cosmology, and find that these non-Gaussianities depend linearly on the wave number and that their amplitude depends sensitively on the string scale. If the string scale is at the TeV scale, string gas cosmology could lead to observable non-Gaussianities, if it is close to the Planck scale, then the non-Gaussianities on current cosmological scales are negligible.
Cite
@article{arxiv.0712.2477,
title = {String Gas Cosmology and Non-Gaussianities},
author = {Bin Chen and Yi Wang and Wei Xue and Robert Brandenberger},
journal= {arXiv preprint arXiv:0712.2477},
year = {2008}
}
Comments
17 pages, 1 figure 4 clarifying sentences added