Observational constraints on variable equation of state parameters of
  dark matter and dark energy after Planck
  In this paper, we study a cosmological model in general relativity within the
framework of spatially flat Friedmann-Robertson-Walker space-time filled with
ordinary matter (baryonic), radiation, dark matter and dark energy, where the
latter two components are described by Chevallier-Polarski-Linder equation of
state parameters. We utilize the observational data sets from SNLS3, BAO and
Planck+WMAP9+WiggleZ measurements of matter power spectrum to constrain the
model parameters. We find that the current observational data offer tight
constraints on the equation of state parameter of dark matter. We consider the
perturbations and study the behavior of dark matter by observing its effects on
CMB and matter power spectra. We find that the current observational data favor
the cold dark matter scenario with the cosmological constant type dark energy
at the present epoch.
