Current cosmological constraints from a 10 parameter cosmic microwave background analysis

We compute the constraints on a "standard" 10 parameter cold dark matter (CDM) model from the most recent CMB data and other observations, exploring 30 million discrete models and two continuous parameters. Our parameters are the densities of CDM, baryons, neutrinos, vacuum energy and curvature, the reionization optical depth, and the normalization and tilt for both scalar and tensor Buctuations. Our strongest constraints are on spatial curvature, -0.24<<Omega>(k)<0.38, and CDM density, h(2)<Omega>(cdm) < 0.3, both at 95%. Including Type Ia supernova constraints gives a positive cosmological constant at high significance. We explore the robustness of our results to various assumptions. We find that three different data subsets give qualitatively consistent constraints. Some of the technical issues that have the largest impact are the inclusion of calibration errors, closed models, gravity waves, reionization, nucleosynthesis constraints, and ten-dimensional likelihood interpolation.