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The cosmological evolution of neutrino energy densities driven by cosmon-typefield equations is introduced assuming that active and sterile neutrinos areintrinsically connected by cosmon fields through the {\em seesaw} mechanism.Interpreting sterile neutrinos as dark matter adiabatically coupled with darkenergy results in a natural decoupling of (active) mass varying neutrino(MaVaN) equations. Identifying the dimensionless scale of the {\em seesaw}mechanism, $m/M$, with a power of the cosmological scale factor, $a$, allowsfor embedding the resulting masses into the generalized Chaplygin gas (GCG)scenario for the dark sector. Without additional assumptions, our findingsestablish a precise connection among three distinct frameworks: the cosmonfield dynamics for MaVaN's, the {\em seesaw} mechanism for dynamical massgeneration and the GCG scenario. Our results also corroborate with previousassertions that mass varying particles can be the right responsible for thestability issue and for the cosmic acceleration of the universe.

Coupling active and sterile neutrinos in the cosmon plus seesaw framework