arXiv:1506.02906·v1·High Energy Physics — Theory
New Symmetries of QED
Daniel Kapec🇺🇸 · Monica Pate🇺🇸 · Andrew Strominger🇺🇸
Abstract
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.
Comments: 17 pages