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- W2094664679 abstract "We use the asymptotic data at conformal null-infinity $mathscr{I}$ to formulate Weinberg's soft-photon theorem for Abelian gauge theories with massless charged particles. We show that the angle-dependent gauge transformations at $mathscr{I}$ are not merely a gauge redundancy, instead they are genuine symmetries of the radiative phase space. In the presence of these symmetries, Poisson bracket between the gauge potentials is not well-defined. This does not pose an obstacle for the quantization of the radiative phase space, which proceeds by treating the conjugate electric field as the fundamental variable. Denoting by $mathcal{G}_+$ and $mathcal{G}_-$ as the group of gauge transformations at $mathscr{I}^+$ and $mathscr{I}^-$ respectively, Strominger has shown that a certain diagonal subgroup $ mathcal{G}_{diag} subset mathcal{G}_+ times mathcal{G}_-$ is the symmetry of the S-matrix and Weinberg's soft-photon theorem is the corresponding Ward identity. We give a systematic derivation of this result for Abelian gauge theories with massless charged particles. Our derivation is a slight generalization of the existing derivations since it is applicable even when the bulk spacetime is not exactly flat, but is only almost Minkowskian." @default.
- W2094664679 created "2016-06-24" @default.
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- W2094664679 date "2015-02-01" @default.
- W2094664679 modified "2023-10-01" @default.
- W2094664679 title "A note on asymptotic symmetries and soft-photon theorem" @default.
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- W2094664679 doi "https://doi.org/10.1007/jhep02(2015)060" @default.
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