Axion-like particles and circular polarisation of active galactic nuclei

Details Axion-like particles and circular polarisation of active galactic nuclei Axion-like particles and circular polarisation of active galactic nuclei

2009-11-03

arxiv.org/abs/0911.0585v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

Contributed to the "5th Patras Workshop on Axions, WIMPs and WISPs", Durham 13-17 July 2009

Scientific paper

The measurements of the linear polarisation of visible light from quasars give strong evidence for large-scale coherent orientations of their polarisation vectors in some regions of the sky. We show that these observations can be explained by the mixing of the photons with very light pseudoscalar (axion-like) particles in extragalactic magnetic fields during their propagation. We present a new treatment in terms of wave packets and discuss the circular polarisation.

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