Non-canonical generalizations of slow-roll inflation models

Understand

We consider non-canonical generalizations of two classes of simple single-field inflation models.

• First, we study the non-canonical version of "ultra-slow roll" inflation, which is a class of inflation models for which quantum modes do not freeze at horizon crossing, but instead evolve rapidly on superhorizon scales.
• Second, we consider the non-canonical generalization of the simplest "chaotic" inflation scenario, with a potential dominated by a quartic (mass) term for the inflaton.
• We find a class of related non-canonical solutions with polynomial potentials, but with varying speed of sound.