Near-horizon description of extremal magnetized stationary black holes and Meissner effect
Jiří Bičák, Filip Hejda
DOI 10.1103/PhysRevD.92.104006 · Physical Review D
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Abstract
After a brief summary of the basic properties of stationary spacetimes representing rotating, charged black holes in strong axisymmetric magnetic fields, we concentrate on extremal cases, for which the horizon surface gravity vanishes. We investigate their properties by constructing simpler spacetimes that exhibit their geometries near degenerate horizons. Starting from the symmetry arguments we find that the near-horizon geometries of extremal magnetized Kerr-Newman black holes can be characterized by just one dimensionless parameter: “effective Kerr-Newman mixing angle.” Employing the near-horizon geometries we demonstrate the Meissner effect of magnetic field expulsion from extremal black holes.
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