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Asymptotic symmetries and Weinberg's soft photon theorem in Minkd+2
2019
Journal of High Energy Physics
We show that Weinberg's leading soft photon theorem in massless abelian gauge theories implies the existence of an infinite-dimensional large gauge symmetry which acts non-trivially on the null boundaries I ± of (d + 2)-dimensional Minkowski spacetime. These symmetries are parameterized by an arbitrary function ε(x) of the d-dimensional celestial sphere living at I ± . This extends the previously established equivalence between Weinberg's leading soft theorem and asymptotic symmetries from four
doi:10.1007/jhep10(2019)213
fatcat:632l4mzbrbhjboraul5yipljxa