Ekpyrotic Non-Gaussianity -- A Review

Details Ekpyrotic Non-Gaussianity -- A Review Ekpyrotic Non-Gaussianity -- A Review

2010-01-18

arxiv.org/abs/1001.3125v2

Physics

High Energy Physics

High Energy Physics - Theory

39 pages, 10 figures. Invited review, replaced with version published in Advances in Astronomy

Scientific paper

Ekpyrotic models and their cyclic extensions solve the standard cosmological flatness, horizon and homogeneity puzzles by postulating a slowly contracting phase of the universe prior to the big bang. This ekpyrotic phase also manages to produce a nearly scale-invariant spectrum of scalar density fluctuations, but, crucially, with significant non-gaussian corrections. In fact, some versions of ekpyrosis are on the borderline of being ruled out by observations, while, interestingly, the best-motivated models predict levels of non-gaussianity that will be measurable by near-future experiments. Here, we review these predictions in detail, and comment on their implications.

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