Quasi-Single Field Inflation and Non-Gaussianities

Details Quasi-Single Field Inflation and Non-Gaussianities Quasi-Single Field Inflation and Non-Gaussianities

2009-11-17

arxiv.org/abs/0911.3380v4

JCAP 1004:027,2010

Physics

High Energy Physics

High Energy Physics - Theory

56 pages, v4, minor revision with added comments, JCAP version

Scientific paper

10.1088/1475-7516/2010/04/027

In quasi-single field inflation models, massive isocurvature modes, that are coupled to the inflaton and have mass of order the Hubble parameter, can have nontrivial impacts on density perturbations, especially non-Gaussianities. We study a simple example of quasi-single field inflation in terms of turning inflaton trajectory. Large bispectra with a one-parameter family of novel shapes arise, lying between the well-known local and equilateral shape. The trispectra can also be very large and its magnitude tNL can be much larger than fNL squared.

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