Scaling attractors in interacting teleparallel dark energy
  It has been proposed recently the existence of a non-minimal coupling between
a canonical scalar field (quintessence) and gravity in the framework of
teleparallel gravity, motivated by similar constructions in the context of
General Relativity. The dynamics of the model, known as teleparallel dark
energy, has been further developed, but no scaling attractor has been found.
Here we consider a model in which the non-minimal coupling is ruled by a
dynamically changing coefficient $\alpha\equiv f_{,\phi}/\sqrt{f}$, with
$f(\phi)$ an arbitrary function of the scalar field $\phi$. It is shown that in
this case the existence of scaling attractors is possible, which means that the
universe will eventually enter these scaling attractors, regardless of the
initial conditions. As a consequence, the cosmological coincidence problem
could be alleviated without fine-tunings.
