Accelerating f(T) gravity models constrained by recent cosmological data
  Generalised Teleparallel gravity, also referred to as f(T) gravity, has been
recently proposed as an extended theory of gravitation able to give rise to an
accelerated expansion in a matter only universe. The cosmic speed up is driven
by an effective torsion fluid whose equation of state depend on the f(T)
function entering the modified gravity Lagrangian. We focus on two particular
choices for f(T) which share the nice property to emulate a phantom divide
crossing as suggested by some recent data. We check their viability contrasting
the predicted background dynamics to the Hubble diagram as traced by both Type
Ia Supernovae (SNeIa) and Gamma Ray Bursts (GRBs), the measurement of the rate
expansion H(z), the Baryon Acoustic Oscillations (BAOs) at different redshifts,
and the Cosmic Microwave Background Radiation (CMBR) distance priors. Both f(T)
models turn out to be in very good agreement with this large dataset so that we
also investigate whether it is possible to discriminate among them relying on
the different growth factors.
