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Title:
Constraints on cosmological parameters from recent measurements of cosmic microwave background anisotropy
Authors:
Hancock, S.; Rocha, G.; Lasenby, A. N.; Gutierrez, C. M.
Affiliation:
AA(Mullard Radio Astronomy Observatory), AB(Kansas State Univ., Manhattan), AC(Mullard Radio Astronomy Observatory), AD(Inst. de Astrofisica de Canarias)
Publication:
Royal Astronomical Society, Monthly Notices, vol. 294, p. L1-L6 (MNRAS Homepage)
Publication Date:
02/1998
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
CONSTRAINTS, COSMOLOGY, BACKGROUND RADIATION, MICROWAVES, ANISOTROPY, DARK MATTER, POWER SPECTRA
DOI:
10.1046/j.1365-8711.1998.01169.x
Bibliographic Code:
1998MNRAS.294L...1H

Abstract

We present new results from a study of recent cosmic microwave background (CMB) observations which provide the first strong evidence for the existence of a 'Doppler peak' localized in both angular scale and amplitude. This first estimate of the angular position of the peak is used to place a new direct limit on the curvature of the universe, corresponding to a density of Omega = 0.7 +0.8, -0.5, consistent with a flat universe. Very low-density 'open' universe models are inconsistent with this limit unless there is a significant contribution from a cosmological constant. For a flat standard cold dark matter dominated universe we use our results in conjunction with big bang nucleosynthesis constraints to determine the value of the Hubble constant as H0 = 30-70 km/s Mpc for baryon fractions Omega(b) = 0.05 to 0.2. For H0 = 50 km/s Mpc we find the primordial spectral index of the fluctuations to be n = 1.1 +/- 0.1, in close agreement with the inflationary prediction of n of about 1.0.

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