EXAMINING THE VARIABLE COSMOLOGICAL CONSTANT MODELS IN THE PRESENCE OF MaVaN's

Abstract

Some properties of variable cosmological constant (VCC) models in generalized mass-varying neutrino (MaVaN) scenarios are examined through an effective parametrization method. The limits of VCC models in case of power-law and exponential potentials are investigated in the nonrelativistic regime. The evolution of a resulting universe state parameter, ω, coupled to a neutrino dynamical mass is obtained. The coupling to MaVaN's constrains the values of the state parameter, ω, to a cosmologically acceptable interval given by -1<ω0≲-0.882. This simplified parametrization method sheds some light on the conventional discussions involving the intricate integrals over neutrino Fermi–Dirac distributions by simplifying the interpretation of MaVaN's contributions to the VCC scenarios.