Non-gaussianity of inflationary field perturbations from the field equation

Details Non-gaussianity of inflationary field perturbations from the field equation Non-gaussianity of inflationary field perturbations from the field equation

2008-02-05

arxiv.org/abs/0802.0588v4

JCAP 0803:014,2008

Astronomy and Astrophysics

Astrophysics

16 pages, uses iopart.sty. v2: replaced with version accepted by JCAP; minor changes of wording only. v3: supersedes version p

Scientific paper

10.1088/1475-7516/2008/03/014

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.

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