Astronomy and Astrophysics – Astrophysics
Scientific paper
1998-10-21
Astronomy and Astrophysics
Astrophysics
16 pages, latex, 9 embedded figures. To appear in the proceedings of the Second International Workshop on Dark Matter (DARK98)
Scientific paper
Evidence for a positive cosmological constant $\Lambda$, derived from the Ly$\alpha$-forest in high-resolution spectra of quasars, leads to a closed, low-density, $\Lambda$-dominated universe. The analysis is based on the assumption of a universal shell structure expanding predominantly with the Hubble flow. Supporting evidence comes from two pairs of very wide absorption lines in the spectra of two quasars separated by 8 arcmin on the sky. These results contradict the higher values of the density parameter $\Omega_{M,0}$ derived, for example, from clusters of galaxies by the pure gravitational instability theory. Implications thereof and for the amount of non-baryonic dark matter in the universe are discussed with some $\Lambda$-dominated models, in particular with $\Omega_{M,0} = 0.2$ and with pure baryonic models. The evidence points to low-density, closed models with spherical metric, expanding forever.
Priester Wolfgang
van de Bruck Carsten
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