Cosmic Microwave Background Anisotropies from Scaling Seeds: Global Defect Models

Details Cosmic Microwave Background Anisotropies from Scaling Seeds: Global Defect Models Cosmic Microwave Background Anisotropies from Scaling Seeds: Global Defect Models

1998-11-11

arxiv.org/abs/astro-ph/9811174v1

Phys.Rev. D59 (1999) 123005

Astronomy and Astrophysics

Astrophysics

LaTeX file with RevTex, 27 pages, 23 eps figs., submitted to Phys. Rev. D. A version with higher quality images can be found a

Scientific paper

10.1103/PhysRevD.59.123005

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 data we conclude that at present we cannot safely reject the model on the grounds of present CMB data. Exclusion by means of galaxy correlation data requires assumptions on biasing and statistics. 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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