paper

Symmetries of asymptotically flat 4 dimensional spacetimes at null infinity revisited

arXiv:0909.2617 · doi:10.1103/PhysRevLett.105.111103

Abstract

It is argued that the symmetry algebra of asymptotically flat spacetimes at null infinity in 4 dimensions should be taken as the semi-direct 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.

7 pages Latex file, references added, comments on Poincare algebra and angular momentum added

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