1999/12/24 by B. Novosyadlyj, Ruth Durrer, Novosyadlyj, B. +8 · 8 citations
Earth and Planetary Sciences · Physics and Astronomy · #Cosmology and Gravitation Theories #Geophysics and Gravity Measurements #Particle physics theoretical and experimental studies #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/9912511
19 pages, 9 figures. Accepted for publication in A&A
arxiv created 2000/02/16 · arxiv updated 2009/12/01
The possibility of determining cosmological parameters on the basis of a wide set of observational data including the Abell-ACO cluster power spectrum and mass function, peculiar velocities of galaxies, the distribution of Ly-α clouds and CMB temperature fluctuations is analyzed. Using a χ2 minimization method, assuming ΩΛ+Ω_\rmmatter =1 and no contribution from gravity waves, we found that a tilted ΛMDM model with one sort of massive neutrinos and the parameters n=1.12± 0.10, Ωm=0.41± 0.11 (ΩΛ=0.59±0.11), Ωcdm=0.31± 0.15, Ων=0.059± 0.028, Ωb=0.039± 0.014 and h=0.70± 0.12 matches observational data best. The 1σ (68.3%) confidence limits on each cosmological parameter, which are obtained by marginalizing over the other parameters, are 0.82≤ n≤1.39, 0.19≤Ωm≤ 1 (0≤ΩΛ≤ 0.81), 0≤Ων≤ 0.17, 0.021≤ Ωb≤ 0.13 and 0.38≤ h≤ 0.85 1.5≤ bcl≤ 3.5. Here bcl is the cluster bias parameter. The best-fit parameters for 31 models which are inside of 1σ range of the best model are presented. It is shown also that observational data set used here rules out the class of CDM models with h≥ 0.5, scale invariant primordial power spectrum, zero cosmological constant and spatial curvature at very high confidence level, >99.99%. The corresponding class of MDM models are ruled out at ∼ 95% C.L.