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We study the impact of higher dimension operators in the inflaton Lagrangian on the non-gaussianity of the scalar spectrum. These terms can strongly enhance the effect without spoiling slow-roll, though it is difficult to exceed fNL ~ 1. In particular we explicitly calculate the 3-point function given by an higher derivative interaction of the form (\\) ⁴, which is expected to give the most important contribution.
Paolo Creminelli (Fri,) studied this question.