The dark side of the torsion: Dark Energy from propagating torsion
  An extension to the Einstein-Cartan (EC) action is discussed in terms of
cosmological solutions. The torsion incorporated in the EC Lagrangian is
assumed to be totally anti-symmetric, represented by a time-like axial vector
$S^\mu$. The dynamics of torsion is invoked by a novel kinetic term. Here we
show that this kinetic term gives rise to dark energy, while the quadratic
torsion term, emanating from the EC part, represents a stiff fluid that leads
to a bouncing cosmology solution. A constraint on the bouncing solution is
calculated using cosmological data from different epochs.
