Fermi-bounce cosmology and the fermion curvaton mechanism
  A nonsingular bouncing cosmology can be achieved by introducing a fermion
field with BCS condensation occurring at high energy scales. In this paper we
are able to dilute the anisotropic stress near the bounce by means of releasing
the gap energy density near the phase transition between the radiation and
condensate states. In order to explain the nearly scale-invariant CMB spectrum,
another fermion field is required. We investigate one possible curvaton
mechanism by involving one another fermion field without condensation where the
mass is lighter than the background field. We show that, by virtue of the
fermion curvaton mechanism, our model can satisfy the latest cosmological
observations very well, and that the fermion species involved may realize a
cosmological see-saw mechanism after one finely tunes model parameters.
