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Results of Combining Peculiar Velocity, CMB and Type 1a Supernova Cosmological Parameter Information

Bridle, SL; Zehavi, I; Dekel, A; Lahav, O; Hobson, MP; Lasenby, AN; (2001) Results of Combining Peculiar Velocity, CMB and Type 1a Supernova Cosmological Parameter Information. Monthly Notices of the Royal Astronomical Society , 321 333 -340. 10.1046/j.1365-8711.2001.04009.x. Green open access

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Abstract

We compare and combine likelihood functions of the cosmological parameters Ωm, h and σ8, from peculiar velocities, cosmic microwave background (CMB) and type Ia supernovae. These three data sets directly probe the mass in the Universe, without the need to relate the galaxy distribution to the underlying mass via a ‘biasing’ relation. We include the recent results from the CMB experiments BOOMERANG and MAXIMA-1. Our analysis assumes a flat Λ cold dark matter (ΛCDM) cosmology with a scale-invariant adiabatic initial power spectrum and baryonic fraction as inferred from big-bang nucleosynthesis. We find that all three data sets agree well, overlapping significantly at the 2σ level. This therefore justifies a joint analysis, in which we find a joint best-fitting point and 95 per cent confidence limits of (0.17,0.39), (0.64,0.86) and (0.98,1.37). In terms of the natural parameter combinations for these data (0.40,0.73), (0.16,0.27). Also for the best-fitting point, and the age of the Universe is 13.2 Gyr.

Type: Article
Title: Results of Combining Peculiar Velocity, CMB and Type 1a Supernova Cosmological Parameter Information
Open access status: An open access version is available from UCL Discovery
DOI: 10.1046/j.1365-8711.2001.04009.x
Publisher version: http://dx.doi.org/10.1046/j.1365-8711.2001.04009.x
Language: English
Additional information: © 2001 RAS Definitive versions of articles pre-2013 are available at http://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1365-2966, now published by http://mnras.oxfordjournals.org
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: https://discovery.ucl.ac.uk/id/eprint/152311
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