1998/10/21 by Carsten van de Bruck, Wolfgang Priester, van de Bruck, Carsten +1
Physics and Astronomy · #Astrophysics (astro-ph) #FOS: Physical sciences #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/9810340
16 pages, latex, 9 embedded figures. To appear in the proceedings of the Second International Workshop on Dark Matter (DARK98), eds. H.V. Klapdor-Kleingrothaus and L. Baudis
arxiv created 1998/10/21 · arxiv updated 2009/12/01
Evidence for a positive cosmological constant Λ, derived from the Lyα-forest in high-resolution spectra of quasars, leads to a closed, low-density, Λ-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 ΩM,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 Λ-dominated models, in particular with ΩM,0 = 0.2 and with pure baryonic models. The evidence points to low-density, closed models with spherical metric, expanding forever.