Birefringence, CMB polarization and magnetized B-mode

Details Birefringence, CMB polarization and magnetized B-mode Birefringence, CMB polarization and magnetized B-mode

2008-12-15

arxiv.org/abs/0812.2804v1

Phys.Rev.D79:087301,2009

Astronomy and Astrophysics

Astrophysics

8 pages, 2 figures

Scientific paper

10.1103/PhysRevD.79.087301

Even in the absence of a sizable tensor contribution, a B-mode polarization can be generated because of the competition between a pseudo-scalar background and pre-decoupling magnetic fields. By investigating the dispersion relations of a magnetoactive plasma supplemented by a pseudo-scalar interaction, the total B-mode polarization is shown to depend not only upon the plasma and Larmor frequencies but also on the pseudo-scalar rotation rate. If the (angular) frequency channels of a given experiment are larger than the pseudo-scalar rotation rate, the only possible source of (frequency dependent) B-mode autocorrelations must be attributed to Faraday rotation. In the opposite case the pseudo-scalar contribution dominates and the total rate becomes, in practice, frequency-independent. The B-mode cross-correlations can be used, under certain conditions, to break the degeneracy by disentangling the two birefringent contributions.

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