Abstract
We investigate a late-time cosmological scenario at the both cosmological background and linear perturbative level which is based on a mass-less λ ϕ 4 theory in which the scalar field is inextricably coupled to massive neutrino matter with Z 2 symmetry by a well defined conformal coupling. The chosen coupling generically leads to the spontaneous symmetry breaking at late times, as the coupling builds up dynamically, such that the field acquires a non-zero mass proportional to the neutrino mass and rolls down slowly around the true ground state which emerges after spontaneous symmetry breaking. From our parametric estimations, we find the given scenario is well supported by the background level cosmological observations and is also in a good agreement with the evolution of growth of matter perturbations.
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