Neutrino Mass from Cosmology

Figure 3

BBN contours at 95% C.L. in the 𝜂_𝜈-𝜂ⁱⁿ_𝜈𝑒 plane for several values of sin²𝜃₁₃: 0 (solid line), 0.04 and normal mass hierarchy (NH) (almost vertical solid line), 0.04 and inverted mass hierarchy (IH) (dotted line) [32].