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.
E.Hubenyand M.Rangamani, No horizons in pp- waves, Journal of High Energy Physics2002, 021–021 (2002)
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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.