Journal Article

Bianchi VII<sub>h</sub> models and the cold spot texture

M. Bridges, J. D. McEwen, M. Cruz, M. P. Hobson, A. N. Lasenby, P. Vielva and E. Martínez-González

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 390, issue 4, pages 1372-1376
Published in print November 2008 | ISSN: 0035-8711
Published online October 2008 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2008.13835.x
Bianchi VIIh models and the cold spot texture

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We have returned to our previous Bianchi VIIh analysis in light of the Cruz et al. suggestion that the cold spot observed near the Southern Galactic Pole may be a remnant temperature perturbation of a cosmic texture. Bridges et al. used two favoured left-handed Bianchi VIIh templates with restricted prior probabilities so that the template was centred close to the cold spot. Using Wilkinson Microwave Anisotropy Probe (WMAP) data ‘corrected’ for the texture fit we have now re-examined both models to assess any changes to these conclusions. We find that both models are left almost entirely unconstrained by the data and consequently exhibit significantly reduced Bayesian evidences. Both models are now disfavoured by the data. This result reinforces our previous assertion that the cold spot was significant in the detection of a Bianchi VIIh component.

Keywords: methods: data analysis; methods: numerical; cosmic microwave background

Journal Article.  2754 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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