Principal‐component analysis of the cosmic microwave background anisotropies: revealing the tensor degeneracy
Identifieur interne : 000416 ( Main/Exploration ); précédent : 000415; suivant : 000417Principal‐component analysis of the cosmic microwave background anisotropies: revealing the tensor degeneracy
Auteurs : G. Efstathiou [États-Unis]Source :
- Monthly Notices of the Royal Astronomical Society [ 0035-8711 ] ; 2002-05.
English descriptors
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, ωb=Ωb h2, ωc=Ωc h2,1 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.
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DOI: 10.1046/j.1365-8711.2002.05315.x
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