Cosmological Parameters 2000

Abstract

The cosmological parameters that I emphasize are the age of the universe $t_0$, the Hubble parameter $H_0\equiv 100h$ km s${}^{-1}$ Mpc${}^{-1}$, the average matter density ${\Omega }_m$, the baryonic matter density ${\Omega }_b$, the neutrino density ${\Omega }_{\nu }$, and the cosmological constant ${\Omega }_{\Lambda }$. The evidence currently favors $t_0\approx 13$ Gyr, $h\approx 0.65$, ${\Omega }_m\approx 0.4\pm 0.1$, ${\Omega }_b=0.02h^{-2}$, $0.001<{\Omega }_{\nu }<0.1$, and ${\Omega }_{\Lambda }\approx 0.7$.

Comments: 16 pages, including one postscript figure; talk presented at 4th International Symposium on Sources and Detection of Dark Matter in the Universe (DM 2000), Marina del Rey, California, 20-23 Feb 2000. Replaced version has updated text and references