Large gauge transformation and little group for soft photons

Abstract

Recently, large gauge transformation (LGT), the residual gauge symmetry after gauge fixing that survives at null infinity, has drawn much attention concerning soft theorems and the memory effect. We point out that LGT charges in quantum electrodynamics are in fact one of non-compact generators of the two dimensional Euclidean group. Moreover, by comparing two equivalent descriptions of gauge transformation, we suggest that LGT is simply another way of describing the gauged little group for massless soft photons.

5 pages, no figure, version to appear in Phys. Rev. D

References in corpus (5)

• Shaving off Black Hole Soft Hair
• Large Gauge Symmetries and Asymptotic States in QED
• The Cosmological Memory Effect
• Lectures on the Infrared Structure of Gravity and Gauge Theory
• Memory in de Sitter space and BMS-like supertranslations

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