Abstract
The extended BMS group includes supertranslation, dual supertranslation and Lorentz transformations. The generators of these symmetries can be classified according to their parity into “electric” and “magnetic” types. Using a multipole expansion of gravitational sources in the Newman-Penrose formalism, we associate each one of these charges with a particular moment. At leading order, the “electric” and “magnetic” monopole moments correspond respectively to supertranslations and dual supertranslations. At the first subleading order, the “electric” and “magnetic” dipole moments correspond respectively to boosts and rotations, therefore comprising the entire Lorentz group. Electric-magnetic type of duality then rotates the boost and rotation generators into each other.
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Kol, U. Subleading BMS charges and the Lorentz group. J. High Energ. Phys. 2022, 2 (2022). https://doi.org/10.1007/JHEP04(2022)002
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DOI: https://doi.org/10.1007/JHEP04(2022)002