1205.5796 (Johannes Noller)

Constraining fast-roll inflation    [PDF]

Johannes Noller

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 $P(X,\phi)$ theories of single field inflation.

View original: http://arxiv.org/abs/1205.5796