Perturbative approach for mass varying neutrinos coupled to the dark sector in the generalized Chaplygin gas scenario

Understand

We suggest a perturbative approach for generic choices for the universe equation of state and introduce a novel framework for studying mass varying neutrinos (MaVaN's) coupled to the dark sector.

• For concreteness, we examine the coupling between neutrinos and the underlying scalar field associated with the generalized Chaplygin gas (GCG), a unification model for dark energy and dark matter.
• It is shown that the application of a perturbative approach to MaVaN mechanisms translates into a constraint on the coefficient of a linear perturbation, which depends on the ratio between a neutrino energy dependent term and scalar field potential terms.
• We quantify the effects on the MaVaN sector by considering neutrino masses generated by the seesaw mechanism.