Open AccessCosmological parameters from complementary observations of the Universe
Author(s) -
Durrer R.,
Novosyadlyj B.
Publication year - 2001
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1046/j.1365-8711.2001.04292.x
Subject(s) - physics , cosmic microwave background , astrophysics , neutrino , cosmic background radiation , cosmological constant , hubble's law , age of the universe , dark energy , redshift , cosmology , anisotropy , particle physics , galaxy , mathematical physics , quantum mechanics
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 Ω m = 0.37 −0.15 +0.25 , Ω Λ =0.69 −0.20 +0.15 , Ω=0.03 −0.03 +0.07 , N=1, Ω b =0.037 −0.018 +0.033 , n s =1.02 −0.10 +0.09 , h=0.71 −0.19 +0.22 , b cl =2.4 −0.7 +0.7 (1 σ 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 2 σ limit on the neutrino content can be expressed in the form Ωh 2 =N 0.64 ≤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 2 σ confidence limit.