Cosmic acceleration and de Sitter expansion in hybrid mass varying neutrino model

TL;DR

This paper introduces a hybrid dark energy model where mass-varying neutrinos trigger cosmic acceleration, leading to a stable de Sitter expansion through symmetry breaking, offering a novel approach to dark energy evolution.

Contribution

It presents a nonminimally coupled hybrid dark energy model driven by mass-varying neutrinos, demonstrating a transition to de Sitter expansion via symmetry breaking.

Findings

Dark energy density remains negligible initially

System evolves to a stable de Sitter attractor

Evolution involves successive Z2 symmetry breakings

Abstract

A nonminimally coupled hybrid dark energy model is introduced. The dark energy evolution is triggered by mass varying neutrinos. Quintessence evolution begins from an initial point, with an insignificant dark energy density, and arrives at a final de Sitter attractor. While initially, for a Higgs-like potential, the non-minimal coupling keeps the system in a state with negligible dark energy density, finally the second quintessence conducts the evolution to a stable fixed point. These evolutions occur through successive $Z_2$ symmetry breakings.