1205.4969 (R. F. Sawyer)
R. F. Sawyer
Photon-photon interactions mediated by the neutral hydrogen background can transform plane polarization into circular polarization, through completely forward processes, [photon+photon+ atom -> photon+photon+atom], in which only the photon polarizations are changed. Our estimate for the maximum amount of circular polarization that could be present in radiation from a particular hot or cold spot in the sky, and in a limited spectral region that comprises the lowest 1 % of the black-body energy spectrum, is in the region 10^{-10} degrees K, in the conventional measure.
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http://arxiv.org/abs/1205.4969
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