Cosmological Parameters and the case for Cold Dark Matter

Details Cosmological Parameters and the case for Cold Dark Matter Cosmological Parameters and the case for Cold Dark Matter

1999-06-16

arxiv.org/abs/astro-ph/9906277v1

Astronomy and Astrophysics

Astrophysics

13 pages, 3 tables, to appear in Proceedings of the 2nd International Workshop on 'The Identification of Dark Matter' (IDM'98)

Scientific paper

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 $\Omega_o = 1, \Lambda = 0$ model and, if anything, there is now an age problem for low $\Omega_o, \Lambda > 0$ models. Large scale structure and CMB fluctuation data are best fitted by a mixed dark matter $\Omega_o$ = 1 universe. Difficulties for this model with cluster evolution, the baryon content of clusters, high z Lyman $\alpha$ galaxies, and the evidence from Type Ia supernovae favouring low $\Omega_o, \Lambda > 0$ models, are discussed critically.

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