Neutrino and Dark Radiation properties in light of latest CMB
  observations
  Recent Cosmic Microwave Background measurements at high multipoles from the
South Pole Telescope and from the Atacama Cosmology Telescope seem to disagree
in their conclusions for the neutrino and dark radiation properties. In this
paper we set new bounds on the dark radiation and neutrino properties in
different cosmological scenarios combining the ACT and SPT data with the nine
year data release of the Wilkinson Microwave Anisotropy Probe (WMAP9), Baryon
Acoustic Oscillation data, Hubble Telescope measurements of the Hubble
constant, and Supernovae Ia luminosity distance data. In the standard three
massive neutrino case, the two high multipole probes give similar results if
Baryon Acoustic Oscillation data are removed from the analyses and Hubble
Telescope measurements are also exploited. A similar result is obtained within
a standard cosmology with Neff massless neutrinos, although in this case the
agreement between these two measurements is also improved when considering
simultaneously Baryon Acoustic Oscillation data and Hubble Space Telescope
measurements. In the Neff massive neutrino case the two high multipole probes
give very different results regardless of the external data sets used in the
combined analyses. In the case in which a dark radiation background with
unknown clustering properties is also considered, SPT data seem to exclude the
standard value for the dark radiation viscosity cvis=1/3 at the 2 sigma CL,
finding evidence for massive neutrinos only when combining SPT data with BAO
measurements.
