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Recent Cosmic Microwave Background measurements at high multipoles from theSouth Pole Telescope and from the Atacama Cosmology Telescope seem to disagreein their conclusions for the neutrino and dark radiation properties. In thispaper we set new bounds on the dark radiation and neutrino properties indifferent cosmological scenarios combining the ACT and SPT data with the nineyear data release of the Wilkinson Microwave Anisotropy Probe (WMAP9), BaryonAcoustic Oscillation data, Hubble Telescope measurements of the Hubbleconstant, and Supernovae Ia luminosity distance data. In the standard threemassive neutrino case, the two high multipole probes give similar results ifBaryon Acoustic Oscillation data are removed from the analyses and HubbleTelescope measurements are also exploited. A similar result is obtained withina standard cosmology with Neff massless neutrinos, although in this case theagreement between these two measurements is also improved when consideringsimultaneously Baryon Acoustic Oscillation data and Hubble Space Telescopemeasurements. In the Neff massive neutrino case the two high multipole probesgive very different results regardless of the external data sets used in thecombined analyses. In the case in which a dark radiation background withunknown clustering properties is also considered, SPT data seem to exclude thestandard 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 BAOmeasurements.

Neutrino and Dark Radiation properties in light of latest CMB observations