• DOI:10.1007/JHEP10(2021)138
• Corpus ID: 233347079

Gravitational footprints of black holes and their microstate geometries

@article{Bah2021GravitationalFO,
  title={Gravitational footprints of black holes and their microstate geometries},
  author={Ibrahima Bah and Iosif Bena and Pierre Heidmann and Yixuan Li and Daniel R. Mayerson},
  journal={Journal of High Energy Physics},
  year={2021},
  volume={2021}
}

• I. Bah, I. Bena, +2 authors D. Mayerson
• Published 21 April 2021
• Physics
• Journal of High Energy Physics

We construct a family of non-supersymmetric extremal black holes and their horizonless microstate geometries in four dimensions. The black holes can have finite angular momentum and an arbitrary charge-to-mass ratio, unlike their supersymmetric cousins. These features make them and their microstate geometries astrophysically relevant. Thus, they provide interesting prototypes to study deviations from Kerr solutions caused by new horizon-scale physics. In this paper, we compute the gravitational multipole structure of these solutions and compare them to Kerr black holes. The multipoles of the black hole differ significantly from Kerr as they depend non-trivially on the charge-to-mass ratio. The horizonless microstate geometries (that are comparable in size to a black hole) have a similar multipole structure as their corresponding black hole, with deviations to the black hole multipole values set by the scale of their microstructure.