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要旨:
The Ernst method of removing nodal singularities from the charged C-metric representing a uniformly accelerated black hole with mass m, charge q and acceleration A by “adding” an electric field E is generalized. Utilizing the new form of the C-metric found recently, Ernst’s simple “equilibrium condition” mA=qE valid for small accelerations is generalized for arbitrary A. The nodal singularity is removed also in the case of accelerating and rotating charged black holes, and the corresponding equilibrium condition is determined.
