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Constraints on cosmological parameters from MAXIMA-1

Balbi, A., Ade, Peter A. R. ORCID: https://orcid.org/0000-0002-5127-0401, Bock, J., Borrill, J., Boscaleri, A., De Bernardis, P., Ferreira, P. G., Hanany, S., Hristov, V., Jaffe, A. H., Lee, A. T., Oh, S., Pascale, Enzo ORCID: https://orcid.org/0000-0002-3242-8154, Rabii, B., Richards, P. L., Smoot, G. F., Stompor, R., Winant, C. D. and Wu, J. H. P. 2000. Constraints on cosmological parameters from MAXIMA-1. The Astrophysical Journal Letters 545 (1) , L1. 10.1086/317323

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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 the COBE Differential Microwave Radiometer experiment. We find constraints on the total energy density of the universe, Ω = 1.0img1.gif, the physical density of baryons, Ωbh2 = 0.03 ± 0.01, the physical density of cold dark matter, Ωcdmh2 = 0.2img2.gif, 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.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Uncontrolled Keywords: cosmic microwave background; cosmology: observations; large-scale structure of universe
Publisher: Institute of Physics
ISSN: 0004-637X
Last Modified: 24 Oct 2022 11:12
URI: https://orca.cardiff.ac.uk/id/eprint/47267

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