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Recent Planck data, combined with previous CMB data and Hubble constant measurements from the HST, provide a constraint on the effective number of relativistic degrees of freedom Neff=3.62+0.50−0.48 at 95% CL, allowing to place limits on models containing relativistic species at the decoupling epoch. We present the bounds on sterile neutrino models combining Planck data with galaxy clustering information, and we review as well the bounds on extended dark sectors with additional light species.
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