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Photon helicity and quantum anomalies in curved spacetimes
Published 2 Dec 2020 in gr-qc and hep-th | (2012.02583v3)
Abstract: We compare several definitions of photon helicity (magnetic, electric, electromagnetic) present in literature. In curved spacetime quantum anomalies can spoil helicity conservation inducing, according to these definitions, different effects on photons: either rotation of linear polarization or production of circular polarization. We derive the Noether current associated with duality transformations starting from manifestly invariant Lagrangians.
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