Alignments in quasar polarizations: pseudoscalar-photon mixing in the presence of correlated magnetic fields

Abstract

We investigate the effects of pseudoscalar-photon mixing on electromagnetic radiation in the presence of correlated extragalactic magnetic fields. We model the Universe as a collection of magnetic domains and study the propagation of radiation through them. This leads to correlations between Stokes parameters over large scales and consistently explains the observed large-scale alignment of quasar polarizations at different redshifts within the framework of the big bang model.

12 pages, 5 figures, version published in PRD

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