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2013

Dark Radiation after Planck

Said, Najla, Di Valentino, Eleonora, Gerbino, Martina

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We present new constraints on the relativistic neutrino effective number N_eff and on the Cosmic Microwave Background power spectrum lensing amplitude A_L from the recent Planck 2013 data release.

Including observations of the CMB large angular scale polarization from the WMAP satellite, we obtain the bounds N_eff = 3.71 +/- 0.40 and A_L = 1.25 +/- 0.13 at 68% c.l..
The Planck dataset alone is therefore suggesting the presence of a dark radiation component at 91.1% c.l.
and hinting for a higher power spectrum lensing amplitude at 94.3% c.l..

Dark Radiation after Planck · Around

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