Observational constraints on tensor perturbations in cosmological models
  with dynamical dark energy
  We constrain the contribution of tensor-mode perturbations with free $n_t$ in
the models with dynamical dark energy with the barotropic equation of state
using Planck-2015 data on CMB anisotropy, polarization and lensing, BICEP2/Keck
Array data on B-mode polarization, power spectrum of galaxies from WiggleZ and
SN Ia data from the JLA compilation. We also investigate the uncertainties of
reconstructed potential of the scalar field dark energy.
