Quasi-Single Field Inflation and Non-Gaussianities
- ,
Citations per year
Abstract: (arXiv)
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.Note:
- 56 pages, v4, minor revision with added comments, JCAP version
- density: perturbation
- inflation
- inflaton
- non-Gaussianity
- Hubble constant
- power spectrum
- squeezed state
- curvature
- n-point function: 3
- numerical calculations
References(82)
Figures(14)