paper

BMS current algebra in the context of the Newman-Penrose formalism

arXiv:1910.14588 · doi:10.1088/1361-6382/ab7c01

Abstract

Starting from an action principle adapted to the Newman-Penrose formalism, we provide a self-contained derivation of BMS current algebra, which includes the generalization of the Bondi mass loss formula to all BMS generators. In the spirit of the Newman-Penrose approach, infinitesimal diffeomorphisms are expressed in terms of four scalars rather than a vector field. In this framework, the on-shell closed co-dimension two forms of the linearized theory associated with Killing vectors of the background are constructed from a standard algorithm. The explicit expression for the breaking that occurs when using residual gauge transformations instead of exact Killing vectors is worked out and related to the presymplectic flux.

v2: section 2 is reorganized and the presentation is improved, to appear in Classical and Quantum Gravity

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