Cosmic Microwave Background Anisotropies from Global Texture

Details Cosmic Microwave Background Anisotropies from Global Texture Cosmic Microwave Background Anisotropies from Global Texture

1999-01-27

arxiv.org/abs/astro-ph/9901377v1

AIPConf.Proc.476:18-37,1999

Astronomy and Astrophysics

Astrophysics

20 page LaTeX file, 11 postscript figs. included, proceedings to the EC conference on 3K Cosmology in Rome, Oct. 98

Scientific paper

10.1063/1.59325

We investigate the global texture model of structure formation in cosmogonies with non-zero cosmological constant for different values of the Hubble parameter. We find that the absence of significant acoustic peaks and little power on large scales are robust predictions of these models. However, from a careful comparison with experiments we conclude that at present we cannot safely reject the model on the grounds of published CMB anisotropy data. If bias is close to one on large scales, galaxy correlation data rules out the models. New, very stringent constraints come from peculiar velocities. Investigating the large-N limit, we argue that our main conclusions apply to all global O(N) models of structure formation.

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