Non-Gaussianity in single field models without slow-roll
  We investigate non-Gaussianity in general single field models without
assuming slow-roll conditions or the exact scale-invariance of the scalar power
spectrum. The models considered include general single field inflation (e.g.
DBI and canonical inflation) as well as bimetric models. We compute the full
non-Gaussian amplitude, its size fnl, its shape, and the running with scale
n_{NG}. In doing so we show that observational constraints allow significant
violations of slow roll conditions and we derive explicit bounds on slow-roll
parameters for fast-roll single field scenarios. A variety of new observational
signatures is found for models respecting these bounds. We also explicitly
construct concrete model implementations giving rise to this new phenomenology.
