Higgsed Chromo-Natural Inflation
  We demonstrate that Chromo-Natural Inflation can be made consistent with
observational data if the SU(2) gauge symmetry is spontaneously broken. Working
in the Stueckelberg limit, we show that isocurvature is negligible, and the
resulting adiabatic fluctuations can match current observational constraints.
Observable levels of chirally-polarized gravitational radiation ($r\sim
10^{-3}$) can be produced while the evolution of all background fields is
sub-Planckian. The gravitational wave spectrum is amplified via linear mixing
with the gauge field fluctuations, and its amplitude is not simply set by the
Hubble rate during inflation. This allows observable gravitational waves to be
produced for an inflationary energy scale below the GUT scale. The tilt of the
resulting gravitational wave spectrum can be either blue or red.
