2014

Asymptotic Symmetries of Massless QED in Even Dimensions

Kapec, Daniel, Lysov, Vyacheslav, Strominger, Andrew

Understand

We consider the scattering of massless particles coupled to an abelian gauge field in 2n-dimensional Minkowski spacetime.

Weinberg's soft photon theorem is recast as Ward identities for infinitely many new nontrivial symmetries of the massless QED S-matrix, with one such identity arising for each propagation direction of the soft photon.
These symmetries are identified as large gauge transformations with angle-dependent gauge parameters that are constant along the null generators of null infinity.
Almost all of the symmetries are spontaneously broken in the standard vacuum and the soft photons are the corresponding Goldstone bosons.

Built on

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Then

J. Broedel, M. de Leeuw, J. Plefka and M. Rosso, “Constraining subleading soft gluon and graviton theorems,” Phys. Rev. D 90
Original
2014
Closest in time.
Z. Bern, S. Davies, P. Di Vecchia and J. Nohle, “Low-Energy Behavior of Gluons and Gravitons from Gauge Invariance,” Phys. Rev. D 90
Original
2014
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C. D. White, “Diagrammatic insights into next-to-soft corrections,” Phys. Lett. B 737
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2014
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Z. Bern, S. Davies and J. Nohle, “On Loop Corrections to Subleading Soft Behavior of Gluons and Gravitons,” Phys. Rev. D 90
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2014
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B. U. W. Schwab, “Subleading Soft Factor for String Disk Amplitudes,” JHEP 1408
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2014
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B. U. W. Schwab and A. Volovich, “Subleading soft theorem in arbitrary dimension from scattering equations,” Phys. Rev. Lett. 113
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2014
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