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Cosmological parameters from complementary observations of the Universe

Durrer, R. ; Novosyadlyj, B.

In: Monthly Notices of the Royal Astronomical Society, 2001, vol. 324, no. 3, p. 560-572

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    Titre
    • Cosmological parameters from complementary observations of the Universe
    Auteur
    • Durrer, R.. Department de Physique Théorique, Université de Genève, Quai Ernest Ansermet 24, CH-1211 Genève 4, Switzerland
    • Novosyadlyj, B.. Astronomical Observatory of National University of L'viv, Kyryla and Mephodia str. 8, 290005 L'viv, Ukraine
    Type de document
    • Postprint
    Langue
    • Anglais
    Publié dans
    • Monthly Notices of the Royal Astronomical Society, 2001, vol. 324, no. 3, p. 560-572. Blackwell Science Ltd
    Autre version électronique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:297459
    Summary
    We use observational data on the large-scale structure (LSS) of the Universe measured over a wide range of scales, from subgalactic up to horizon scale, and on the cosmic microwave background anisotropies to determine cosmological parameters within the class of adiabatic inflationary models. We show that a mixed dark matter model with cosmological constant (ΛMDM model) and parameters Ωm = 0.37−0.15+0.25,ΩΛ = 0.69−0.20+0.15,Ω = 0.03−0.03+0.07,N = 1,Ωb = 0.037−0.018+0.033,ns = 1.02−0.10+0.09,h = 0.71−0.19+0.22,bcl = 2.4−0.7+0.7 (1σ confidence limits) matches observational data on LSS, the nucleosynthesis constraint, direct measurements of the Hubble constant, the high-redshift supernova type Ia results and the recent measurements of the location and amplitude of the first acoustic peak in the cosmic microwave background (CMB) anisotropy power spectrum. The best model is Λ-dominated (65 per cent of the total energy density) and has slightly positive curvature, Ω = 1.06. The clustered matter consists of 8 per cent massive neutrinos, 10 per cent baryons and 82 per cent cold dark matter (CDM). The upper 2σ limit on the neutrino content can be expressed in the form Ωh2 = N0.64≤0.042 or, via the neutrino mass, m≤4.0 eV. The upper 1(2)σ limit for the contribution of a tensor mode to the COBE DMR data is TS<1(1.5). Furthermore, it is shown that the LSS observations, together with the Boomerang (+MAXIMA-1) data on the first acoustic peak, rule out zero-Λ models at more than a 2σ confidence limit