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

Fermi-bounce cosmology and the fermion curvaton mechanism