Constraining fast-roll inflation

Abstract

We present constraints on how far single field inflation may depart from the familiar slow-roll paradigm. Considering a fast-roll regime while requiring a (near)-scale-invariant power spectrum introduces large self-interactions for the field and consequently large and scale-dependent non-Gaussianities. Employing this signal, we use the requirement of weak-coupling together with WMAP constraints to derive bounds on generic $P(X,\varphi )$ theories of single field inflation.

arXiv commentProceedings for Rencontres de Moriond, 2012, Cosmology ; v2: reference and minor clarification added, results/equations/conclusions unchanged

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Cited by in corpus (1)

• Non-Gaussian Shape Discrimination with Spectroscopic Galaxy Surveys