Résumé
The canonical definition of the angular momentum flux in the Bondi formalism of general relativity transforms under supertranslations. These correspond to gravitational waves of infinite wavelength –
After a brief review of relevant earlier results, I will propose a definition of angular momentum and angular momentum flux that reproduces perturbative results in gravitational scattering, is conserved, closes the correct algebra under Poisson brackets, and reduces to the standard expressions in non-radiating spacetimes.