Symmetron and de Sitter attractor in a teleparallel model of cosmology

TL;DR

This paper investigates a teleparallel cosmological model with non-minimal couplings, demonstrating how it can naturally transition from matter dominance to accelerated expansion with stable de Sitter attractors.

Contribution

It introduces a novel teleparallel model with specific couplings that explain cosmic acceleration and de Sitter attractors through symmetry breaking.

Findings

Model describes transition from matter era to accelerated expansion.

Stable de Sitter solutions are achieved at late times.

Conformal coupling maintains zero dark energy in early universe.

Abstract

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 non-minimal couplings lead the Universe to a stable state with de Sitter expansion at the late time.