paper

Black holes of type D revisited: relating their various metric forms

arXiv:2409.02308 · doi:10.1103/PhysRevD.111.024038

Abstract

We investigate a complete family of spacetimes which represent black holes with rotation, NUT twist, acceleration, electric and magnetic charges. These are exact solutions of the Einstein-Maxwell equations with any cosmological constant, such that the (non-null) electromagnetic field is aligned with both the double-degenerate principal null directions of the Weyl tensor. In particular, we explicitly relate various coordinates and the corresponding physical parameters of such solutions, namely the original Plebanski-Demianski (PD) form, the convenient Astorino (A) form which was found recently, and formally improved here (A+), the Griffiths-Podolsky (GP), and Podolsky-Vratny (PV) form of the metric. It is demonstrated that, if properly mapped and physically interpreted, all these representations cover the complete class of type D black holes. Using the new A-parameters, the two main PD quartic metric functions are factorized into the product of quadratic expressions, enabling thus an explicit analysis. Moreover, we clarify the role of the twist parameter , related to both the Kerr-like rotation and the NUT parameters and , respectively. Special attention is payed to the elusive subclass of accelerating NUT black holes with .

51 pages, 1 figure, 1 table. Final version accepted for publication in Phys. Rev. D (with updated references and corrected typos)

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