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.

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

References in corpus (5)

• Primordial Non-Gaussianities from Inflation Models
• A new method for calculating the primordial bispectrum in the squeezed limit
• On the squeezed limit of the bispectrum in general single field inflation
• Consistency Relations for Non-Gaussianity
• A new parameter in attractor single-field inflation

Cited by in corpus (8)

• Primordial Black Holes and Local Non-Gaussianity in Canonical Inflation
• Multi-field inflation and cosmological perturbations
• Resilience of long modes in cosmological observables
• Formation of trapped vacuum bubbles during inflation, and consequences for PBH scenarios
• Single-Field Consistency relation and $\delta N$-Formalism
• Degeneracy in the spectrum and bispectrum among featured inflaton potentials
• Curvature Perturbations in the Effective Field Theory of Inflation
• Bayes' Theorem, Inflation, and the Ekpyrotic Universe