Phys. Rev. Lett. 79, 2394–2397 (1997)Is There Evidence for Cosmic Anisotropy in the Polarization of Distant Radio Sources?Received 20 May 1997; published in the issue dated 29 September 1997 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 [Phys. Rev. Lett. 78, 3043 (1997)] have claimed to find evidence for a redshift- and direction-dependent rotation effect in existing data. We reexamine 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. © 1997 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.79.2394
DOI:
10.1103/PhysRevLett.79.2394
PACS:
98.80.Es, 14.80.Mz, 41.20.Jb
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