The Cosmological Constant $Λ$, the Age of the Universe and Dark Matter: Clues from the Ly$α$-Forest

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dc.creatorvan de Bruck, Carsten
dc.creatorPriester, Wolfgang
dc.date1998-10-21
dc.date.accessioned2026-07-07T02:28:40Z
dc.date.available2026-07-07T02:28:40Z
dc.descriptionEvidence for a positive cosmological constant $Λ$, derived from the Ly$α$-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 $Ω_{M,0}$ 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 $Λ$-dominated models, in particular with $Ω_{M,0} = 0.2$ and with pure baryonic models. The evidence points to low-density, closed models with spherical metric, expanding forever.
dc.description16 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
dc.identifierhttps://arxiv.org/abs/astro-ph/9810340
dc.identifierhttp://arxiv.org/abs/astro-ph/9810340
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/13160
dc.subjectAstrophysics
dc.titleThe Cosmological Constant $Λ$, the Age of the Universe and Dark Matter: Clues from the Ly$α$-Forest
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