Advances in Theoretical and Mathematical Physics
Volume 21 (2017)
Special Issue: Proceedings of the Strings 2016 Conference in Beijing
Guest Editors: J. Maldacena (Institute for Advanced Study), H. Ooguri (California Institute of Technology), H. Babak (Harvard University), S. Li (Tsinghua University), W. Song (Tsinghua University), and H. Lin (Tsinghua University)
New symmetries of QED
Pages: 1769 – 1785
The soft photon theorem in $U(1)$ gauge theories with only massless charged particles has recently been shown to be the Ward identity of an infinite-dimensional asymptotic symmetry group. This symmetry group is comprised of gauge transformations which approach angle-dependent constants at null infinity. In this paper, we extend the analysis to all $U(1)$ theories, including those with massive charged particles such as QED.
Published 19 March 2018