Consistency relation and inflaton field redefinition in the delta N formalism

Abstract

We compute for general single-field inflation the intrinsic non-Gaussianity due to the self-interactions of the inflaton field in the squeezed limit. We recover the consistency relation in the context of the delta N formalism, and argue that there is a particular field redefinition that makes the intrinsic non-Gaussianity vanishing, thus improving the estimate of the local non-Gaussianity using the delta N formalism.

Comments: (v1) 10 pages; (v2) references added, to appear in Physics Letters B