The latest data from the Planck satellite have consolidated our understanding of the cosmic microwave background and the early Universe — except for some large-angle anomalies. These effects could be accounted for by invoking SU(2) gauge symmetry for photon propagation.
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Hofmann, R. The fate of statistical isotropy. Nature Phys 9, 686–689 (2013). https://doi.org/10.1038/nphys2793
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DOI: https://doi.org/10.1038/nphys2793