Residual gauge symmetry in light-cone electromagnetism

Abstract

We analyze the residual gauge freedom in light-cone electromagnetism in four dimensions. The standard boundary conditions involved in the so-called $l{c}_2$ formalism, which contains only the two physical degrees of freedom, allow for a subset of residual gauge transformations. We relax the boundary conditions imposed on the fields in order to obtain all the residual gauge transformations. We compute the canonical generators for Poincaré and gauge transformations with these relaxed boundary conditions. This enables us to distinguish between the trivial (proper) and large (improper) gauge transformations in light-cone electromagnetism. We then employ the Newman-Penrose formalism to identify the incoming and outgoing radiation fields. We comment on the quadratic form structure of light-cone Hamiltonians, often encountered in $l{c}_2$ gauge theories.

22 pages, 1 figure, 1 table

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• KLT relations from the Einstein-Hilbert Lagrangian
• A double copy for asymptotic symmetries in the self-dual sector
• The N=8 Supergravity Hamiltonian as a Quadratic Form
• BMS algebra from residual gauge invariance in light-cone gravity
• BMS algebra as an extension of the Poincaré symmetry in light-cone gravity
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