arXiv:0903.0631·v2·Cosmology and Nongalactic Astrophysics
Non-Gaussianity in a Matter Bounce
Yi-Fu Cai🇨🇳 · Wei Xue🇨🇦 · Robert Brandenberger🇨🇦 · Xinmin Zhang🇨🇳
Abstract
A nonsingular bouncing cosmology in which the scales of interest today exit the Hubble radius in a matter-dominated contracting phase yields an alternative to inflation for producing a scale-invariant spectrum of adiabatic cosmological fluctuations. In this paper we identify signatures in the non-Gaussianities of the fluctuations which are specific to this scenario and allow it to be distinguished from the results of inflationary models.
Comments: 10 pages, 6 figures, 2 references added