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Article overview
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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 | Affiliation: | 1,3), 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) | Abstract: | A 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 | Services: | Forum | Review | PDF | Favorites |
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