Abstract
We reduce the gravitational theory in an asymptotically flat spacetime to future null infinity. We compute the Poincaré flux operators at future null infinity and construct the supertranslation and superrotation generators. The generators are shown to form a closed symmetry algebra by including a generalized gravitational duality operator. We could regard all the generators as the Hamiltonians with respect to the symmetry transformation in the boundary field theory. Our construction of the generators may relate to the BMS fluxes defined in the literature by adding counterterms to the Bondi mass and angular momentum aspects.
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Acknowledgments
The work of J.L. is supported by NSFC Grant No. 12005069.
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Liu, WB., Long, J. Symmetry group at future null infinity III: Gravitational theory. J. High Energ. Phys. 2023, 117 (2023). https://doi.org/10.1007/JHEP10(2023)117
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DOI: https://doi.org/10.1007/JHEP10(2023)117