Journal
PHYSICAL REVIEW D
Volume 79, Issue 8, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.79.087301
Keywords
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Funding
- Spanish Science Ministry [FPA2005-04823, FIS2006-05319, CSD2007-00042]
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Even in the absence of a sizable tensor contribution, a B-mode polarization can be generated because of the competition between a pseudoscalar background and predecoupling magnetic fields. By investigating the dispersion relations of a magnetoactive plasma supplemented by a pseudoscalar interaction, the total B-mode polarization is shown to depend not only upon the plasma and Larmor frequencies but also on the pseudoscalar rotation rate. If the (angular) frequency channels of a given experiment are larger than the pseudoscalar rotation rate, the only possible source of (frequency-dependent) B-mode autocorrelations must be attributed to Faraday rotation. In the opposite case the pseudoscalar 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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