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The Kerr-Newman metric describes a very special rotating, charged mass and is the most general of the asymptotically flat stationary 'black hole' solutions to the Einstein-Maxwell equations of general relativity.We review the derivation of this metric from the Reissner-Nordström solution by means of a complex transformation algorithm and provide a brief overview of its basic geometric properties.We also include some discussion of interpretive issues, related metrics, and higher-dimensional analogues.
Newman et al. (Wed,) studied this question.