Large non-Gaussianities with Intermediate Shapes from Quasi-Single Field Inflation

Details Large non-Gaussianities with Intermediate Shapes from Quasi-Single Field Inflation Large non-Gaussianities with Intermediate Shapes from Quasi-Single Field Inflation

2009-09-02

arxiv.org/abs/0909.0496v3

Phys.Rev.D81:063511,2010

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

5 pages, v3, minor revision, PRD version

Scientific paper

10.1103/PhysRevD.81.063511

We study the slow-roll inflation models, where the inflaton slow-rolls along a trajectory whose orthogonal directions are lifted by potentials with masses of order the Hubble parameter. In these models large non-Gaussianities can be generated through the transformation from the isocurvature modes to the curvature mode, once the inflaton trajectory turns. We find large bispectra with one-parameter family of novel shapes, interpolating between the equilateral and local shape. According to the in-in formalism, the shapes of these non-Gaussianities are different from a simple projection from the isocurvature non-Gaussian correlation functions.

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