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Symmetries of Asymptotically Flat Four-Dimensional Spacetimes at Null Infinity Revisited

par Barnich, Glenn ;Troessaert, Cédric
Référence Physical review letters, 105, 11
Publication Publié, 2010-09-08

Article révisé par les pairs

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Résumé :

It is shown that the symmetry algebra of asymptotically flat spacetimes at null infinity in 4 dimensions should be taken as the semidirect sum of supertranslations with infinitesimal local conformal transformations and not, as usually done, with the Lorentz algebra. As a consequence, two-dimensional conformal field theory techniques will play as fundamental a role in this context of direct physical interest as they do in three-dimensional anti-de Sitter gravity.