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Quasi-Local Energy of a Charged Rotating Object Described by the Kerr-Newman Metric

The Brown-York quasi-local energy of a charged rotating black hole described by the Kerr-Newman metric and enclosed by a fixed-radius surface is computed. No further assumptions on the angular momentum or the radial coordinate in Boyer-Lindquist coordinates were made. The result can be expressed in terms of incomplete elliptic integrals and is used to analyze the self-energy of an electron which is assumed to be described by the Kerr-Newman metric. For this purpose the small sphere limit is investigated thoroughly comparing the analysis with known results. Evaluating the energy using the mass, angular momentum and charge of an electron a value in the order of the Planck energy is obtained in the small sphere limit as long as the Kerr-Newman metric acting as exterior solution can be used as a description of spacetime.