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Low's Subleading Soft Theorem as a Symmetry of QED
2014
Physical Review Letters
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It was shown by F. Low in the 1950s that the subleading terms of soft photon S-matrix elements obey a universal linear relation. In this paper we give a new interpretation to this old relation, for the case of massless QED, as an infinitesimal symmetry of the S-matrix. The symmetry is shown to be locally generated by a vector field on the conformal sphere at null infinity. Explicit expressions are constructed for the associated charges as integrals over null infinity and shown to generate the
doi:10.1103/physrevlett.113.111601
pmid:25259965
fatcat:ud6mjsg2jfap3dbmyggye4qepy