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Principal-component analysis of the cosmic microwave background anisotropies: revealing the tensor degeneracy

Efstathiou, G. (2002) Principal-component analysis of the cosmic microwave background anisotropies: revealing the tensor degeneracy. Monthly Notices of the Royal Astronomical Society, 332 (1). pp. 193-198. ISSN 0035-8711. http://resolver.caltech.edu/CaltechAUTHORS:20180509-074828051

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Abstract

A principal-component analysis of cosmic microwave background (CMB) anisotropy measurements is used to investigate degeneracies among cosmological parameters. The results show that a degeneracy with tensor modes — the ‘tensor degeneracy’— dominates uncertainties in estimates of the baryon and cold dark matter densities, ω_b=Ω_bh^2, ω_c=Ω_ch^(2,1) from an analysis of CMB anisotropies alone. The principal-component analysis agrees well with a maximum-likelihood analysis of the observations, identifying the main degeneracy directions and providing an impression of the effective dimensionality of the parameter space.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1046/j.1365-8711.2002.05315.xDOIArticle
https://arxiv.org/abs/astro-ph/0109151arXivDiscussion Paper
Additional Information:© 2002 RAS. Accepted 2001 December 18. Received 2001 December 17; in original form 2001 September 14. Published: 01 May 2002. I thank Caltech for the award of a Moore Scholarship. I thank Andrew Liddle for discussions of inflationary models and various members of the 2dF Galaxy Survey team and a referee for their comments on an earlier draft.
Group:TAPIR
Funders:
Funding AgencyGrant Number
Gordon and Betty Moore FoundationUNSPECIFIED
Subject Keywords:cosmic microwave background – cosmology: miscellaneous
Record Number:CaltechAUTHORS:20180509-074828051
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20180509-074828051
Official Citation:G. Efstathiou; Principal-component analysis of the cosmic microwave background anisotropies: revealing the tensor degeneracy, Monthly Notices of the Royal Astronomical Society, Volume 332, Issue 1, 1 May 2002, Pages 193–198, https://doi.org/10.1046/j.1365-8711.2002.05315.x
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:86303
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:09 May 2018 16:57
Last Modified:09 May 2018 16:57

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