Black-hole microstate spectroscopy: Ringdown, quasinormal modes, and echoes

@article{Ikeda2021BlackholeMS,
  title={Black-hole microstate spectroscopy: Ringdown, quasinormal modes, and echoes},
  author={Taishi Ikeda and Massimo Bianchi and Dario Consoli and Alfredo Grillo and Jos{\`e} Francisco Morales and Paolo Pani and Guilherme Raposo},
  journal={Physical Review D},
  year={2021}
}
Deep conceptual problems associated with classical black holes can be addressed in string theory by the “fuzzball” paradigm, which provides a microscopic description of a black hole in terms of a thermodynamically large number of regular, horizonless, geometries with much less symmetry than the corresponding black hole. Motivated by the tantalizing possibility to observe quantum gravity signatures near astrophysical compact objects in this scenario, we perform the first 3 + 1 numerical… 

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