Principal Component Analysis of the Cosmic Microwave Background Anisotropies: Revealing The Tensor Degeneracy

Preprint

10 September 2001

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.astro-ph/0109151

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, omega_b = Omega_b h2, omega_c = \Omega_c h^2, 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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Version 1, 2001-09-10, ArXiv
Published version: Monthly Notices of the Royal Astronomical Society, 332 (1), 193.

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