Current cosmological constraints from a 10 parameter cosmic microwave background analysis

We compute the constraints on a "standard" 10 parameter cold dark matter (C DM) model from the most recent CMB data and other observations, exploring 3 0 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 9 5%. Including Type Ia supernova constraints gives a positive cosmological c onstant at high significance. We explore the robustness of our results to v arious assumptions. We find that three different data subsets give qualitat ively consistent constraints. Some of the technical issues that have the la rgest impact are the inclusion of calibration errors, closed models, gravit y waves, reionization, nucleosynthesis constraints, and ten-dimensional lik elihood interpolation.