A power-law coupled three-form dark energy model
  We consider a field theory model of coupled dark energy which treats dark
energy as a three-form field and dark matter as a spinor field. By assuming the
effective mass of dark matter as a power-law function of the three-form field
and neglecting the potential term of dark energy, we obtain three solutions of
the autonomous system of evolution equations, including a de Sitter attractor,
a tracking solution and an approximate solution. To understand the strength of
the coupling, we confront the model with the latest Type Ia Supernova (SN Ia),
Baryon Acoustic Oscillations (BAO) and Cosmic Microwave Backround (CMB)
radiation observations, with the conclusion that the combination of these three
databases marginalized over the present dark matter density parameter
$\Omega_{m0}$ and the present three-form field $\kappa X_{0}$ gives stringent
constraints on the coupling constant, $-0.017< \lambda <0.047$ ($2\sigma$
confidence level), by which we give out the model applicable parameter range.
