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The measurements of the linear polarisation of visible light from quasarsgive strong evidence for large-scale coherent orientations of theirpolarisation vectors in some regions of the sky. We show that theseobservations can be explained by the mixing of the photons with very lightpseudoscalar (axion-like) particles in extragalactic magnetic fields duringtheir propagation. We present a new treatment in terms of wave packets anddiscuss the circular polarisation.

Axion-like particles and circular polarisation of active galactic nuclei