Photon helicity and quantum anomalies in curved spacetimes
General Relativity and Quantum Cosmology
2023-06-02 v3 High Energy Physics - Theory
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.
Keywords
Cite
@article{arxiv.2012.02583,
title = {Photon helicity and quantum anomalies in curved spacetimes},
author = {Matteo Galaverni and Gabriele Gionti S. J.},
journal= {arXiv preprint arXiv:2012.02583},
year = {2023}
}
Comments
Accepted for publication in General Relativity and Gravitation: changed to correspond to the proof-read version