Abstract
Using the formalism developed in the preceding paper, all axisymmetric stationary horizons are described. It is found that the bifurcate-type horizons (such as Schwarzschild) are as numerous as about four functions of one variable, while the extreme-type ones (such as extreme Kerr) only as about two functions of one variable. On the other hand, there is exactly one axisymmetric stationary space-time containing a given bifurcate-type horizon, in comparison to a whole family (at least as numerous as two functions of one variable) of such space-times for a given extreme-type one.
The total massm and angular momentumam of the corresponding black hole could in principle be computed from the invariants describing the bifurcate-type horizons, because the horizons determine their space-time uniquely, but a definite way of computation will probably be difficult to find. On the other hand, the Kerr-Newman-like parametersm anda are easily defined and computed for any extreme-type horizon, but their physical meaning remains so far obscure.
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A part of this work was supported by Alexander von Humboldt-Stiftung.
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Hájíček, P. Exact models of charged black holes. Commun.Math. Phys. 34, 53–76 (1973). https://doi.org/10.1007/BF01646542
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DOI: https://doi.org/10.1007/BF01646542