Fig. 37.

Samples from Planck TT,TE,EE+lowE+lensing, colour coded by the value of the Hubble parameter H0, for a model with minimal-mass active neutrinos and one additional sterile neutrino with mass parameterized by . The physical mass for thermally-produced sterile neutrinos,
, is constant along the grey lines labelled by the mass in eV; the equivalent result for sterile neutrinos produced via the Dodelson-Widrow mechanism (Dodelson & Widrow 1994) is shown by the adjacent thinner lines. The dark grey shaded region shows the part of parameter space excluded by our default prior
, where the sterile neutrinos would start to behave like dark matter for CMB constraints.
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