Cold + Hot Dark Matter Cosmology with m\(νμ\)~m\(ντ\)~2.4 eV

Cold + hot dark matter (CHDM) Ω = 1 cosmological models require a total neutrino mass ~5 eV. Because recent data support the ν_μ-->ν_τ oscillation explanation of the cosmic ray ν_μ deficit, which requires that m\(ν_μ\)~m\(ν_τ\), this suggests that m\(ν_μ\)~m\(ν_τ\)~2.4 eV. The linear calculations and N-body simulation reported here indicate that an Ω = 1 CHDM model with two 2.4 eV neutrinos (designated Cν²DM) agrees remarkably well with all available observations, but only if the Hubble parameter h~0.5. We also show that even one 2.4 eV neutrino raises serious difficulties for low- Ω flat CDM models.