https://doi.org/10.1140/epjc/s10052-021-09270-x
Regular Article - Theoretical Physics
Cosmological dynamics of dark energy in scalar-torsion 
gravity
Instituto de Física, Pontificia Universidad Católica de Valparaíso, Casilla, 4950, Valparaiso, Chile
Received:
2
February
2021
Accepted:
19
May
2021
Published online:
31
May
2021
It is investigated the cosmological dynamics of scalar-torsion gravity as a dark energy model, where T is the torsion scalar of teleparallel gravity and 
is a canonical scalar field. In this context, we are concerned with the phenomenology of the class of models with non-linear coupling to gravity and exponential potential. We obtain the critical points of the autonomous system, along with the stability conditions of each one of them and their cosmological properties. Particularly, we show the existence of new attractors with accelerated expansion, as well as, new scaling solutions in which the energy density of dark energy scales as the background fluid density, thus, defining the so-called scaling radiation and scaling matter epochs. The scaling solutions are saddle points, and therefore, the system exits these solutions to the current epoch of cosmic acceleration, towards an attractor point describing the dark energy-dominated era.
© The Author(s) 2021
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