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We report on an update of the test on the rotation of the plane of linearpolarization for light traveling over cosmological distances, using acomparison between the measured direction of the UV polarization in 8 radiogalaxies at z>2 and the direction predicted by the model of scattering ofanisotropic nuclear radiation, which explains the polarization. No rotation isdetected within a few degrees for each galaxy and, if the rotation does notdepend on direction, then the all-sky-average rotation is constrained to be\theta = -0.8 +/- 2.2. We discuss the relevance of this result for constrainingcosmological birefringence, when this is caused by the interaction with acosmological pseudo-scalar field or by the presence of a Cherns-Simons term.

Limits on Cosmological Birefringence from the Ultraviolet Polarization of Distant Radio Galaxies