Polarization of the Microwave Background in Defect Models

Details Polarization of the Microwave Background in Defect Models Polarization of the Microwave Background in Defect Models

1997-04-23

arxiv.org/abs/astro-ph/9704231v1

Phys.Rev.Lett.79:1615-1618,1997

Astronomy and Astrophysics

Astrophysics

4 pages, 3 figures, RevTeX file

Scientific paper

10.1103/PhysRevLett.79.1615

We compute the polarization power spectra for global strings, monopoles, textures and nontopological textures, and compare them to inflationary models. We find that topological defect models predict a significant (1 microK) contribution to magnetic type polarization on degree angular scales, which is produced by the large vector component of the defect source. We also investigate the effect of decoherence on polarization. It leads to a smoothing of acoustic oscillations both in temperature and polarization power spectra and strongly suppresses the cross-correlation between temperature and polarization relative to inflationary models. Presence or absence of magnetic polarization or cross-correlation would be a strong discriminator between the two theories of structure formation and will be testable with the next generation of CMB satellites.

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