Symmetron and de Sitter attractor in a teleparallel model of cosmology
Journal of Cosmology and Astroparticle Physics
In the teleparallel framework of cosmology, a quintessence with non-minimal couplings to the scalar torsion and a boundary term is considered. A conformal coupling to matter density is also taken into account. It is shown that the model can describe the onset of cosmic acceleration after an epoch of matter dominated era, where dark energy is negligible, via Z_2 symmetry breaking. While the conformal coupling holds the Universe in a state with zero dark energy density in the early epoch, the
... minimal couplings lead the Universe to a stable state with de Sitter expansion at the late time.