Year: 2000
Type: article
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 the COBE Differential Microwave Radiometer experiment. We find constraints on the total energy density of the universe, Ω = 1.0 , the physical density of baryons, Ω b h 2 = 0.03 ± 0.01, the physical density of cold dark matter, Ω cdm h 2 = 0.2 , and the spectral index of primordial scalar fluctuations, n s = 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 < Ω Λ < 0.75 and 0.25 < Ω m < 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.
Source: The Astrophysical Journal
DOI: 10.1086/317323
Institutions: University of Rome Tor Vergata, Lawrence Berkeley National Laboratory, University of California, Berkeley, Queen Mary University of London, California Institute of Technology, Jet Propulsion Laboratory, National Energy Research Scientific Computing Center, National Research Council, Sapienza University of Rome, University of Oxford, Instituto Superior Técnico, University of Minnesota, Space Sciences Laboratory, Nicolaus Copernicus Astronomical Center
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W2062073902