Cosmological parameters from complementary observations of the Universe

We use observational data on the large-scale structure (LSS) of the Univers e measured over a wide range of scales,, from subgalactic up to horizon sca le, and on the cosmic microwave background anisotropies to determine cosmol ogical parameters within the class of adiabatic inflationary models. We sho w that a mixed dark matter model with cosmological constant (Lambda MDM mod el) and parameters Omega (m) = 0.37(-0.15)(+0.25), Omega (Lambda) = 0.69(-0 .20)(+0.15), Omega (v) = 0.03(-0.03)(+0.07), N-v = 1, Omega (b), 0.037(-0.0 18)(+0.033) n(s) = 1.02(-0.10)(+0.09), h = 0.71(-0.19)(+0.22), bcl = 2.4(-0 .7)(+0.7) (1 sigma confidence limits) matches observational data on LSS, th e nucleosynthesis constraint, direct measurements of the Hubble constant, t he high-redshift supernova type Ia results and the recent measurements of t he location and amplitude of the first acoustic peak in the cosmic microwav e background (CMB) anisotropy power spectrum. The best model is Lambda -dom inated (65 per cent of the total energy density) and has slightly positive curvature, Omega = 1.06. The clustered matter consists of 8 per cent massiv e neutrinos, 10 per cent baryons and 82 per cent cold dark matter (CDM). Th e upper 2 sigma limit on the neutrino content can be expressed in the form Omega (v)h(2)/N-v(0.64) less than or equal to 0.042 or, via the neutrino ma ss, m(v) less than or equal to 4.0 eV. The upper 1(2)sigma limit for the co ntribution of a tensor mode to the COBE DMR data is T/S < 1(1.5). Furthermo re, it is shown that the LSS observations, together with the Boomerang (+MA XIMA-1) data on the first acoustic peak, rule out zero-h models at more tha n a 2<sigma> confidence limit.