Quasi-single field inflation and non-Gaussianities
Journal Article
·
· Journal of Cosmology and Astroparticle Physics
- Center for Theoretical Cosmology, Department of Applied Mathematics and Theoretical Physics, University of Cambridge, Wilberforce Road, Cambridge CB30WA (United Kingdom)
- Physics Department, McGill University, 3600 Rue University, Montreal, H3A2T8 (Canada)
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 t{sub NL} can be much larger than f{sub NL}{sup 2}.
- OSTI ID:
- 22272861
- Journal Information:
- Journal of Cosmology and Astroparticle Physics, Journal Name: Journal of Cosmology and Astroparticle Physics Journal Issue: 04 Vol. 2010; ISSN 1475-7516
- Country of Publication:
- United States
- Language:
- English
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