Identification of a new infinite-dimensional asymptotic symmetry algebra with central extensions for the four-dimensional Nappi-Witten spacetime, whose phase space includes general pp-wave metrics and Penrose limits of Kerr black holes.
This work is supported by the F.R.S.-FNRS (Belgium) through con- vention IISN 4.4514.08 and benefited from the support of the Solvay Family
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Infinite-dimensional symmetries in plane wave spacetimes
Identification of a new infinite-dimensional asymptotic symmetry algebra with central extensions for the four-dimensional Nappi-Witten spacetime, whose phase space includes general pp-wave metrics and Penrose limits of Kerr black holes.