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.

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

References in corpus (2)

• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• Non-Gaussianity in single field models without slow-roll

Cited by in corpus (1)

• Non-Gaussian Shape Discrimination with Spectroscopic Galaxy Surveys