Non-Gaussianities in New Ekpyrotic Cosmology

Details Non-Gaussianities in New Ekpyrotic Cosmology Non-Gaussianities in New Ekpyrotic Cosmology

2007-10-26

arxiv.org/abs/0710.5172v3

Phys.Rev.Lett.100:171302,2008

Physics

High Energy Physics

High Energy Physics - Theory

4 pages. v2: sign convention clarified, references added; v3: minor changes, version to appear in PRL

Scientific paper

10.1103/PhysRevLett.100.171302

New Ekpyrotic Cosmology is an alternative scenario of the early universe which relies on a phase of slow contraction before the big bang. We calculate the 3-point and 4-point correlation functions of primordial density perturbations and find a generically large non-Gaussian signal, just below the current sensitivity level of CMB experiments. This is in contrast with slow-roll inflation, which predicts negligible non-Gaussianity. The model is also distinguishable from alternative inflationary scenarios that yield large non-Gaussianity, such as DBI inflation and the simplest curvaton-like models, through the shape dependence of the correlation functions. Non-Gaussianity therefore provides a distinguishing and testable prediction of New Ekpyrotic Cosmology.

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