Constraints on the cosmological parameters from BICEP2, Planck and WMAP
  In this paper we constrain the cosmological parameters, in particular the
tilt of tensor power spectrum, by adopting Background Imaging of Cosmic
Extragalactic Polarization (B2), Planck released in 2013 (P13) and Wilkinson
Microwaves Anisotropy Probe 9-year Polarization (WP) data. We find that a blue
tilted tensor power spectrum is preferred at more than $3\sigma$ confidence
level if the data from B2 are assumed to be totally interpreted as the relic
gravitational waves, but a scale invariant tensor power spectrum is consistent
with the data once the polarized dust is taken into account. The recent Planck
353 GHz HFI dust polarization data imply that the B2 data are perfectly
consistent with there being no gravitational wave signal.
