Scalar field power-law cosmology with spatial curvature and dark
  energy-dark matter interaction
  We consider a late closed universe of which scale factor is a power function
of time using observational data from combined WMAP5+BAO+SNIa dataset and WMAP5
dataset. The WMAP5 data give power-law exponent, $\alpha = 1.01$ agreeing with
the previous study of $H(z)$ data while combined data gives $\alpha=0.985$.
Considering a scalar field dark energy and dust fluid evolving in the power-law
universe, we find field potential, field solution and equation of state
parameters. Decaying from dark matter into dark energy is allowed in addition
to the non-interaction case. Time scale characterizing domination of the
kinematic expansion terms over the dust and curvature terms in the scalar field
potential are found to be approximately 5.3 to 5.5 Gyr. The interaction affects
in slightly lowering the height of scalar potential and slightly shifting
potential curves rightwards to later time. Mass potential function of the
interacting Lagrangian term is found to be exponentially decay function.
