Classical central extension for asymptotic symmetries at null infinity in three spacetime dimensions

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Classical central extension for asymptotic symmetries at null infinity in three spacetime dimensions

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, 04.6...

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ژورنال

عنوان ژورنال: Classical and Quantum Gravity

سال: 2007

ISSN: 0264-9381,1361-6382

DOI: 10.1088/0264-9381/24/5/f01