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We present a method for calculating large numbers of power spectra C_l andP(k) that accelerates CMBfast by a factor around 10^3 without appreciable lossof accuracy, then apply it to constrain 11 cosmological parameters from currentCosmic Microwave Background (CMB) and Large Scale Structure (LSS) data. Whilethe CMB alone still suffers from several degeneracies, allowing, e.g., closedmodels with strong tilt and tensor contributions, the shape of the real spacepower spectrum of galaxies from the IRAS Point Source Catalogue Redshift (PSCz)survey breaks these degeneracies and helps place strong constraints on mostparameters. At 95% confidence, the combined CMB and LSS data imply a baryondensity 0.020 < omega_b < 0.037, dark matter density 0.10 < omega_d < 0.32 witha neutrino fraction f_nu < 38%, vacuum density Omega_Lambda < 0.76, curvature-0.19 < Omega_k < 0.10, scalar tilt 0.86 < n_s < 1.16 and reionization opticaldepth tau < 0.44. These joint constraints are quite robust, changing littlewhen we impose priors on the Hubble parameter, tilt, flatness, gravity waves orreionization. Adding nucleosynthesis and neutrino priors on the other handtightens parameters considerably, requiring Omega_Lambda > 0.49 and a red-tilt.  The analysis allows a number of consistency tests to be made, all of whichpass. At the 95% level, the flat scalar ``concordance model'' withOmega_Lambda=0.62, omega_d=0.13, omega_b=0.02, f_nu~0, n_s=0.9, tau=0.1, h=0.63is consistent with external constraints. The inferred PSCz bias b~1.2 agreeswith the value estimated independently from redshift space distortions. Theinferred cosmological constant value agrees with the one independently derivedfrom SN 1a studies. Cosmology seems to be on the right track.

Towards a refined cosmic concordance model: Joint 11-parameter constraints from the cosmic microwave background and large-scale structure