  We consider a Lorentz-violating theory of inflation consisting of
Einstein-aether theory with a scalar inflaton coupled bilinearly to the
expansion of the aether. We determine the conditions for linearized stability,
positive energy, and vanishing of preferred-frame post-Newtonian parameters,
and find that all these conditions can be met. In homogeneous and isotropic
cosmology, the inflaton-aether expansion coupling leads to a driving force on
the inflaton that is proportional to the Hubble parameter. This force affects
the slow-roll dynamics, but still allows for a natural end to inflation.
