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Non-Gaussianity of inflationary field perturbations from the field equation
journal contribution
posted on 2023-06-08, 06:30 authored by David SeeryDavid Seery, Karim A Malik, David H LythWe calculate the tree-level bispectrum of the inflaton field perturbation directly from the field equations, and construct the corresponding f NL parameter. Our results agree with previous ones derived from the Lagrangian. We argue that quantum theory should only be used to calculate the correlators when they first become classical a few Hubble times after horizon exit, the classical evolution taking over thereafter
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Publication status
- Published
Journal
Journal of Cosmology and Astroparticle PhysicsISSN
14757516External DOI
Issue
3Volume
2008Department affiliated with
- Physics and Astronomy Publications
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Article number 014Full text available
- No
Peer reviewed?
- Yes
Legacy Posted Date
2012-02-06Usage metrics
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