H_0 and Odds on Cosmology

Recent observations by the Hubble Space Telescope of Cepheids in the Virgo cluster imply a Hubble Constant $H_0=80\pm17$\ km/sec/Mpc. We attempt to clarify some issues of interpretation of these results for determining the global cosmological parameters $Ω$ and $Λ$. Using the formalism of Bayesian model comparison, the data suggest a universe with a nonzero cosmological constant $Λ>0$, but vanishing curvature: $Ω+Λ=1$.

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