The Matter Bounce Curvaton Scenario
  Massless scalar fields originating in a quantum vacuum state acquire a
scale-invariant spectrum of fluctuations in a matter-dominated contracting
universe. We show that these isocurvature fluctuations transfer to a
scale-invariant spectrum of curvature fluctuations during a non-singular bounce
phase. This provides a mechanism for enhancing the primordial adiabatic
fluctuations and suppressing the ratio of tensor to scalar perturbations.
Moreover, this mechanism leads to new sources of non-Gaussianity of curvature
perturbations.
