Published May 1, 2002
| Version Published + Submitted
Journal Article
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Principal-component analysis of the cosmic microwave background anisotropies: revealing the tensor degeneracy
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.
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.Attached Files
Published - Efstathiou-2002-Monthly_Notices_of_the_Royal_Astronomical_Society.pdf
Submitted - 0109151.pdf
Files
0109151.pdf
Additional details
Identifiers
- Eprint ID
- 86303
- Resolver ID
- CaltechAUTHORS:20180509-074828051
Related works
- Describes
- https://arxiv.org/abs/astro-ph/0109151 (URL)
Funding
- Gordon and Betty Moore Foundation
Dates
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2018-05-09Created from EPrint's datestamp field
- Updated
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2021-11-15Created from EPrint's last_modified field
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