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Published online by Cambridge University Press: 24 April 2025
We consider the rotating black hole, the Kerr solution, and the rotating black hole with charge, the Kerr–Newman solution. We describe their symmetries and causal structure, including the new features of the ring singularity and the ergosphere, with frame-dragging (observers are forced to rotate with the black hole) and calculate the Penrose diagram. Finally, we describe the Penrose process of extracting energy and angular momentum from the rotating black hole.
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