Is there evidence for cosmic anisotropy in the polarization of distant radio sources?

George B. Field; Sean M. Carroll

Is there evidence for cosmic anisotropy in the polarization of distant radio sources?

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arxiv astro-ph/9704263 v3 pith:KOHRDCQP submitted 1997-04-27 astro-ph gr-qchep-ph

Sean M. Carroll , George B. Field This is my paper · ORCID

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keywords dataevidencepolarizationradiosourcesthereableangle

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Measurements of the polarization angle and orientation of cosmological radio sources may be used to search for unusual effects in the propagation of light through the universe. Recently, Nodland and Ralston (astro-ph/9704196) have claimed to find evidence for a redshift- and direction-dependent rotation effect in existing data. We re-examine these data and argue that there is no statistically significant signal present. We are able to place stringent limits on hypothetical chiral interactions of photons propagating through spacetime.

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3-form dark energy can explain cosmic birefringence with a dimension-4 photon coupling, yielding redshift profiles that can mimic or differ from axion dark energy, but the implied photon mass estimate is numerically shaky.

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