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Photon-photon interactions can be a source of CMB circular polarization

Authors
  • Sawyer, R. F.
Type
Preprint
Publication Date
Dec 08, 2014
Submission Date
Aug 22, 2014
Identifiers
arXiv ID: 1408.5434
Source
arXiv
License
Yellow
External links

Abstract

Photon-photon interactions, as described by 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 standard deviation of the resulting circular polarization parameter, as constrained by confining observations to angular regions of large plane polarization, and find results of the order of $10^{-9}$ for the Stokes parameter $V$.

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