Systematics of Constant Roll Inflation

Understand

We study constant roll inflation systematically.

• This is a regime, in which the slow roll approximation can be violated.
• It has long been thought that this approximation is necessary for agreement with observations.
• However, recently it was understood that there can be inflationary models with a constant, and not necessarily small, rate of roll that are both stable and compatible with the observational constraint $n_s \approx 1$.