Is the type-D NUT C metric really missing from the most general Plebański-Demiański solution?
Year: 2024
Type: article
Abstract: It remains a long-standing problem, unsettled for almost two decades in the general relativity community, ever since Griffiths and Podolsk\'y demonstrated in their previous paper [J. B. Griffiths and J. Podolsk\'y, Classical Quantum Gravity 22, 3467 (2005)] that the type-D NUT $C$ metric seems to be absent from the most general family of the type-D Pleba\ifmmode \acute{n}\else \'{n}\fi{}ski-Demia\ifmmode \acute{n}\else \'{n}\fi{}ski (P-D) solution. However, Astorino, in his recent article [M. Astorino, Phys. Rev. D 109, 084038 (2024)] presented a different form of rotating and accelerating black holes and showed that all known four-dimensional type-D accelerating black holes (without the NUT charge) can be recovered via various different limits in a definitive fashion. In particular, he provided, for the first time, the correct expressions for the type-D static accelerating black holes with a nonzero NUT charge, which was previously impossible using the traditional parametrization of the familiar P-D solution. Nevertheless, it still remains elusive how these two different forms of the four-dimensional rotating and accelerating solutions are related. In this paper, we aim to fill this gap by finding the obvious coordinate transformations and parameter identifications between the vacuum metrics after two different parametrizations of the generated solution via the inverse scattering method from the seed metric---the Rindler vacuum background. We then resolve this ``missing'' puzzle by providing another M\"obius transformation and linear combinations of the Killing coordinates, which clearly cast the type-D NUT $C$ metric into the familiar form of the P-D solution. Additionally, we propose an alternative new routine for the normalization of the obtained metric derived via the inverse scattering method from the vacuum seed solution, which could be potentially useful for the construction of higher-dimensional solutions using the trivial vacuum background as the seed metric.
Authors: Shuang-Qing Wu, Di Wu
Institution: China West Normal University
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W4404749089