New Symmetries of QED
Daniel Kapec, Monica Pate, and Andrew Strominger
TL;DR
This paper extends the understanding of asymptotic symmetries in U(1) gauge theories, including QED with massive charges, revealing new symmetries related to soft photon theorems.
Contribution
It generalizes the connection between soft photon theorems and asymptotic symmetries to include theories with massive charged particles.
Findings
Identifies new asymptotic symmetries in QED with massive charges
Links soft photon theorems to Ward identities in these theories
Enhances understanding of gauge symmetry structure at null infinity
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.
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