Non-Gaussianity in single field models without slow-roll

Details Non-Gaussianity in single field models without slow-roll Non-Gaussianity in single field models without slow-roll

2011-02-01

arxiv.org/abs/1102.0275v2

Phys.Rev.D83:103511,2011

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

28 pages + appendices, 6 figures, References and minor comments added in revised version

Scientific paper

10.1103/PhysRevD.83.103511

We investigate non-Gaussianity in general single field models without assuming slow-roll conditions or the exact scale-invariance of the scalar power spectrum. The models considered include general single field inflation (e.g. DBI and canonical inflation) as well as bimetric models. We compute the full non-Gaussian amplitude, its size fnl, its shape, and the running with scale n_{NG}. In doing so we show that observational constraints allow significant violations of slow roll conditions and we derive explicit bounds on slow-roll parameters for fast-roll single field scenarios. A variety of new observational signatures is found for models respecting these bounds. We also explicitly construct concrete model implementations giving rise to this new phenomenology.

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