paper

Gravitational decoupling for axially symmetric systems and rotating black holes

arXiv:2101.08569 · doi:10.1103/PhysRevD.103.044020

Abstract

We introduce a systematic and direct procedure to generate hairy rotating black holes by deforming a spherically symmetric seed solution. We develop our analysis in the context of the gravitational decoupling approach, without resorting to the Newman-Janis algorithm. As examples of possible applications, we investigate how the Kerr black hole solution is modified by a surrounding fluid with conserved energy-momentum tensor. We find non-trivial extensions of the Kerr and Kerr-Newman black holes with primary hair. We prove that a rotating and charged black hole can have the same horizon as Kerr's, Schwarzschild's or Reissner-Nordström's, thus showing possible observational effects of matter around black holes.

11 pages, 4 figures

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