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Mass of Kerr-Newman Black Holes in an external magnetic field
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Mass of Kerr-Newman Black Holes in an external magnetic field
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The explicit solution for a Kerr-Newman black hole immersed in an external magnetic field, sometimes called the Melvin-Kerr-Newman black hole, has been derived by Ernst and Wild in 1976. In this paper, we clarify the first law and Smarr formula for black holes in a magnetic field. We then define the unique mass which is integrable and reduces to the Kerr-Newman mass in the absence of magnetic field. This defines the thermodynamic potentials of the black hole. Quite strikingly, the mass coincides with the standard Christodoulou-Ruffini mass of a black hole as a function of the entropy, angular momentum and electric charge.
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Cited by 1 Pith paper
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Thermodynamics of Kerr-Bertotti-Robinson black hole
A consistent thermodynamics of the Kerr-Bertotti-Robinson black hole is constructed by adopting the Christodoulou-Ruffini mass relation, yielding a first law and Smarr formula without an explicit magnetic-field work term.
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