Higgsed Gauge-flation
  We study a variant of Gauge-flation where the gauge symmetry is spontaneously
broken by a Higgs sector. We work in the Stueckelberg limit and demonstrate
that the dynamics remain (catastrophically) unstable for cases where the gauge
field masses satisfy $\gamma < 2$, where $\gamma = g^2\psi^2/H^2$, $g$ is the
gauge coupling, $\psi$ is the gauge field vacuum expectation value, and $H$ is
the Hubble rate. We compute the spectrum of density fluctuations and
gravitational waves, and show that the model can produce observationally viable
spectra. The background gauge field texture violates parity, resulting in a
chiral gravitational wave spectrum. This arises due to an exponential
enhancement of one polarization of the spin-2 fluctuation of the gauge field.
Higgsed Gauge-flation can produce observable gravitational waves at
inflationary energy scales well below the GUT scale.
