Cosmological Parameters: do we already know the final answer ?

Abstract

Some of the arguments which support the strong concensus for an ${\Omega }_o$ = 0.3, ${\lambda }_o$ = 0.7 model are reexamined. Corrections for Malmquist bias, local flow and metallicity suggest a revised value for $H_o$ of 63 $\pm$ 6 km/s/Mpc, improving the age problems for an ${\Omega }_o$ = 1 universe. The latest CMB results may require a high baryon density and hence new physics, for example a strong lepton asymmetry. Difficulties for the ${\Omega }_o$ = 1 model with cluster evolution, the baryon content of clusters, and the evidence from Type Ia supernovae favouring low ${\Omega }_o$, $\Lambda >0$ models, are discussed critically.

10 pages, 3 figures. To appear in 'IDM2000: 3rd International Workshop on Identification of Dark Matter', ed N.Spooner (World Scientific)

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