Thermal Inflation with a Thermal Waterfall Scalar Field Coupled to a
  Light Spectator Scalar Field
  A new model of thermal inflation is introduced, in which the mass of the
thermal waterfall field is dependent on a light spectator scalar field. Using
the $\delta N$ formalism, the "end of inflation" scenario is investigated in
order to ascertain whether this model is able to produce the dominant
contribution to the primordial curvature perturbation. A multitude of
constrains are considered so as to explore the parameter space, with particular
emphasis to key observational signatures. For natural values of the parameters,
the model is found to yield a sharp prediction for the scalar spectral index
and its running, well within the current observational bounds.
