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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 Lyth
We 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

History

Publication status

  • Published

Journal

Journal of Cosmology and Astroparticle Physics

ISSN

14757516

Issue

3

Volume

2008

Department affiliated with

  • Physics and Astronomy Publications

Notes

Article number 014

Full text available

  • No

Peer reviewed?

  • Yes

Legacy Posted Date

2012-02-06

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