Cosmic Microwave Background Anisotropies in the Global Monopole and Texture Theories of Cosmic Structure Formation

Details Cosmic Microwave Background Anisotropies in the Global Monopole and Texture Theories of Cosmic Structure Formation Cosmic Microwave Background Anisotropies in the Global Monopole and Texture Theories of Cosmic Structure Formation

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.8904b&link_type=abstract

American Astronomical Society, 181st AAS Meeting, #89.04; Bulletin of the American Astronomical Society, Vol. 24, p.1264

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We report on calculations of anisotropy in the cosmic microwave background radiation in the global monopole and texture models for cosmic structure formation. We have evolved the six component linear gravitational field along with the monopole or texture scalar fields numerically in an expanding universe and performed the Sachs-Wolfe integrals directly on the calculated gravitational fields. On scales > 7(deg) , we find a Gaussian distribution with an approximately scale invariant fluctuation spectrum. The Delta T/T amplitude is a factor of 4-5 larger than the prediction of the standard CDM model with the same Hubble constant and density fluctuation normalization. The recently reported COBE-DMR results imply that global monopole and texture models require high bias factors or a large Hubble constant in contrast to standard CDM which requires very low H_0 and bias values. For H_0 = 70 {km/ sec Mpc(-1}) , we find that normalizing to the COBE results implies b_8 =~ 3.3+/- 1.5 (95% c.l.) for global monopoles and b_8 =~ 3.4+/- 1.6 (95% c.l.) for textures. We also report on the implications for smaller angular scale experiments.

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