We use observational data on the large scale structure ( LSS ) of the Universe measured over a wide range of scales from sub-galactic 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 ( \Lambda MDM model ) and parameters \Omega _ { m } = 0.37 ^ { +0.25 } _ { -0.15 } , \Omega _ { \Lambda } = 0.69 ^ { +0.15 } _ { -0.20 } , \Omega _ { \nu } = 0.03 ^ { +0.07 } _ { -0.03 } , N _ { \nu } = 1 , \Omega _ { b } = 0.037 ^ { +0.033 } _ { -0.018 } , n _ { s } = 1.02 ^ { +0.09 } _ { -0.10 } , h = 0.71 ^ { +0.22 } _ { -0.19 } , b _ { cl } = 2.4 ^ { +0.7 } _ { -0.7 } ( 1 \sigma confidence limits ) matches observational data on LSS , the nucleosynthesis constraint , direct measurements of 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 CMB anisotropy power spectrum .
The best model is \Lambda dominated ( 65 % of the total energy density ) and has slightly positive curvature , \Omega = 1.06 .
The clustered matter consists in 8 % massive neutrinos , 10 % baryons and 82 % cold dark matter ( CDM ) .
The upper 2 \sigma limit on the neutrino content can be expressed in the form \Omega _ { \nu } h ^ { 2 } / N _ { \nu } ^ { 0.64 } \leq 0.042 or , via the neutrino mass , m _ { \nu } \leq 4.0 eV .
The upper 1 ( 2 ) \sigma limit for the contribution of a tensor mode to the COBE DMR data is T/S < 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- \Lambda models at more than 2 \sigma confidence limit .