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As experimentalists step up their pursuit of cold dark matter particles andneutrino masses, cosmological constraints are tightening. We compute the jointconstraints on 11 cosmological parameters from cosmic microwave background andlarge scale structure data, and find that at 95% confidence, the total(cold+hot) dark matter density is h^2 Omega_dark = 0.20 +.12 -.10 with at most38% of it being hot (due to neutrinos). A few assumptions, including negligibleneutrinos, tighten this measurement to h^2 Omega_dark = 0.13 +0.04 -0.02, i.e,2.4e-27 kg/m^3 give or take 20%.

Latest Cosmological Constraints on the Densities of Hot and Cold Dark Matter