Constraints on Cosmological Parameters from MAXIMA-1

Details Constraints on Cosmological Parameters from MAXIMA-1 Constraints on Cosmological Parameters from MAXIMA-1

Dec 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000apj...545l...1b&link_type=abstract

The Astrophysical Journal, Volume 545, Issue 1, pp. L1-L4.

Astronomy and Astrophysics

Astronomy

346

Cosmology: Cosmic Microwave Background, Cosmology: Observations, Cosmology: Large-Scale Structure Of Universe

Scientific paper

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 the COBE Differential Microwave Radiometer experiment. We find constraints on the total energy density of the universe, Ω=1.0+0.15-0.30, the physical density of baryons, Ωbh2=0.03+/-0.01, the physical density of cold dark matter, Ωcdmh2=0.2+0.2-0.1, and the spectral index of primordial scalar fluctuations, ns=1.08+/-0.1, 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 0.45<ΩΛ<0.75 and 0.25<Ωm<0.50, at the 95% confidence level. Our results are consistent with a flat universe and the shape parameter deduced from large-scale structure, and in marginal agreement with the baryon density from big bang nucleosynthesis.

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