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Photon-photon interactions as a source of cosmic microwave background circular polarization
Phys. Rev. D 91, 021301(R) – Published 8 January, 2015
DOI: https://doi.org/10.1103/PhysRevD.91.021301
Abstract
Photon-photon interactions, as described with the standard Heisenberg-Euler interaction, can transform plane polarization of the CMB into circular polarization, in the period right after last scattering. We estimate the distribution of the resulting circular polarization parameters, as constrained by confining observations to very small angular regions of large plane polarization, and find results of the order of for the Stokes parameter in some of these regions.
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