Classical central extension for asymptotic symmetries at null infinity in three spacetime dimensions
نویسندگان
چکیده
The symmetry algebra of asymptotically flat spacetimes at null infinity in three dimensions is the semi-direct sum of the infinitesimal diffeomorphisms on the circle with an abelian ideal of supertranslations. The associated charge algebra is shown to admit a non trivial classical central extension of Virasoro type closely related to that of the anti-de Sitter case. PACS numbers: 04.20.Ha, 04.60.-m, 11.10.Ef, 11.30.-j Senior Research Associate of the National Fund for Scientific Research (Belgium) Research Fellow of the National Fund for Scientific Research (Belgium). Central charge for bms3 2
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