Constraints on Cosmological Parameters from MAXIMA-1

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Abstract
We set new constraints on a seven-dimensional space of cosmological parameters within the class of inflationary adiabatic models. We use the angular power spectrum of the cosmic microwave background measured over a wide range of l in the first flight of the MAXIMA balloon-borne experiment (MAXIMA-1) and the low l results from COBE/DMR. We find constraints on the total energy density of the universe, \Omega=0.90 +/- 0.15, the physical density of baryons, \Omega_{b}h^2 = 0.025 +/- 0.010, the physical density of cold dark matter, \Omega_{cdm}h^2=0.13 +/- 0.10, and the spectral index of primordial scalar fluctuations, n_s=0.99 +/- 0.09, all at the 95% confidence level. By combining our results with measurements of high-redshift supernovae we constrain the value of the cosmological constant and the fractional amount of pressureless matter in the universe to 0.40 < \Omega_\Lambda < 0.76 and 0.25< \Omega_{m} < 0.50, at the 95% confidence level. Our results are consistent with a flat universe, the baryon density from big bang nucleosynthesis and the shape parameter deduced from large scale structure.

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