Research Article

Cosmic Dark Radiation and Neutrinos

Table 2

Marginalized 68% c.l. constraints on in a standard cosmology with massless neutrinos. In the second and in the fourth columns, we also apply a prior on the Hubble constant from the Hubble Space Telescope measurements. In the third and in the fourth columns, we apply the BBN consistency relation. In the last column, we also vary the helium fraction and we show its marginalized 68% c.l.

ā€‰ Planck + WP + highL Planck + WP + highL + Planck + WP + highL + BBNc Planck + WP + highL + + BBNc Planck + WP + highL


BBN BBN