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29 March 2024
 
  » arxiv » astro-ph/9708254

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Constraints on cosmological parameters from recent measurements of CMB anisotropy
S. Hancock ; G. Rocha ; A.N. Lasenby ; C.M. Gutierrez ( Mullard Radio Astronomy Observatory ; Cavendish Laboratory ; Instituto de Astrofisica de Canarias ; Department of Physics ; Kansas State University ;
Date 27 Aug 1997
Subject astro-ph
Affiliation1,3), A.N. Lasenby and C.M. Gutierrez ( Mullard Radio Astronomy Observatory, Cavendish Laboratory (MRAO), Instituto de Astrofisica de Canarias (IAC), Department of Physics, Kansas State University (KSU)
AbstractA key prediction of cosmological theories for the origin and evolution of structure in the Universe is the existence of a `Doppler peak’ in the angular power spectrum of cosmic microwave background (CMB) fluctuations. We present new results from a study of recent CMB observations which provide the first strong evidence for the existence of a `Doppler Peak’ localised 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 $ho=30-70kmspmpc$ for baryon fractions $Omega_b=0.05$ to 0.2. For $ho=50kmspmpc$ we find the primordial spectral index of the fluctuations to be $n=1.1 pm 0.1$, in close agreement with the inflationary prediction of $n simeq 1.0$
Source arXiv, astro-ph/9708254
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