Limits on Neutrino Mass from Cosmic Structure Formation
Masataka Fukugita, Guo-Chin Liu, Naoshi Sugiyama
Abstract
We consider the effect of three species of neutrinos with nearly degenerate mass on the cosmic structure formation in a low matter-density universe within a hierarchical clustering scenario with a flat initial perturbation spectrum. The matching condition for fluctuation powers at the COBE scale and at the cluster scale leads to a strong upper limit on neutrino mass. For a flat universe with matter density parameter Omega=0.3, we obtain mnu<0.6eV for the Hubble constant H0<80km/s/Mpc. Allowing for the more generous parameter space limited by Omega<0.4, H0<80km/s/Mpc and age t0>11.5Gyr, the limit is 0.9eV.
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