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On regular frames near rotating black holes

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arxiv 1802.07069 v2 pith:2BHMCTXC submitted 2018-02-20 gr-qc hep-th

classification gr-qchep-th
keywords blackmetricregularcoordinateframeholenearrotating
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We consider the metric of a generic axially symmetric rotating stationary black hole. The general approach is developed that enables us to construct coordinate frame regular near the horizon. As explicit examples, the Kerr and Kerr-Newmann-(anti-)de Sitter metrics are considered. It is shown how the rotational versions of the Painleve'-Gullstrand and Doran coordinates appear in this scheme as particular cases. For the 2+1 version of the metric the direct generalization of the Lema\^itre coordinate system is obtained. It is shown that the possibility of introducing a regular frame is indirectly related to the constancy of a black hole angular velocity and the rate with which the metric coefficient responsible for the rotation of spacetime, tends to it.

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  1. Generalized Lema\^itre time for rotating and charged black holes and its near-horizon properties

    gr-qc 2025-09 conditional novelty 5.0 of 10

    The finiteness of the generalized Lemaitre time at a black hole horizon is controlled by the sign of the quantity X=E-omega L or X=E-q phi, which also enforces kinematic censorship.

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