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From the analysis of measurements of the linear polarisation of visible lightcoming from quasars, the existence of large-scale coherent orientations ofquasar polarisation vectors in some regions of the sky has been reported. Here,we show that this can be explained by the mixing of the incoming photons withnearly massless pseudoscalar (axion-like) particles in extragalactic magneticfields. We present a new treatment in terms of wave packets and discuss itsimplications for the circular polarisation.

On the circular polarisation of light from axion-photon mixing