Dynamical neutrino masses in the generalized Chaplygin gas scenario with mass varying CDM

TL;DR

This paper explores a cosmological model where neutrinos, dark matter, and dark energy interact via a scalar field, leading to a unified framework that reproduces generalized Chaplygin gas behavior and accounts for cosmic acceleration.

Contribution

It introduces a model with mass-varying neutrinos and dark matter coupled through a scalar field, unifying dark matter and dark energy within the generalized Chaplygin gas framework.

Findings

Conditions for cosmic acceleration are satisfied.

Stability of the model is maintained.

Perturbations align with generalized Chaplygin gas predictions.

Abstract

Neutrinos coupled to an underlying scalar field in the scenario for unification of mass varying dark matter and cosmon-{\em like} dark energy is examined. In the presence of a tiny component of mass varying neutrinos, the conditions for the present cosmic acceleration and for the stability issue are reproduced. It is assumed that {\em sterile} neutrinos behave like mass varying dark matter coupled to mass varying {\em active} neutrinos through the {\em seesaw} mechanism, in a kind of {\em mixed} dark matter sector. The crucial point is that the dark matter mass may also exhibit a dynamical behavior driven by the scalar field. The scalar field mediates the nontrivial coupling between the mixed dark matter and the dark energy responsible for the accelerated expansion of the universe. The equation of state of perturbations reproduce the generalized Chaplygin gas (GCG) cosmology so that all the effective results from the GCG paradigm are maintained, being perturbatively modified by neutrinos.