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Consistency relation and inflaton field redefinition in the delta N formalism

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arxiv 1606.03343 v2 pith:KRXS4T2N submitted 2016-06-10 astro-ph.CO gr-qchep-phhep-th

Guillem Domenech , Jinn-Ouk Gong , Misao Sasaki This is my paper · ORCID
classification astro-ph.COgr-qchep-phhep-th
keywords deltafieldformalismnon-gaussianityconsistencyinflatonintrinsicredefinition
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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.

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  1. Curvature Perturbations in the Effective Field Theory of Inflation

    gr-qc 2019-08 conditional novelty 7.0 of 10

    In single-field inflation, conservation of the comoving curvature perturbation implies conservation of the unitary and synchronous curvatures, but not the reverse, with observable consequences in ultra-slow-roll and a...

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