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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
Seery et al. (Mon,) studied this question.
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