Cosmological Parameters and the case for Cold Dark Matter

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Determinations of the main cosmological parameters are reviewed and the implications for cold dark matter discussed. There is no longer an age problem for an Ωₒ = 1, Λ= 0 model and, if anything, there is now an age problem for low Ωₒ, Λ> 0 models. Large scale structure and CMB fluctuation data are best fitted by a mixed dark matter Ωₒ = 1 universe. Difficulties for this model with cluster evolution, the baryon content of clusters, high z Lyman α galaxies, and the evidence from Type Ia supernovae favouring low Ωₒ, Λ> 0 models, are discussed critically.