In a generalized black bounce spacetime, horizonless configurations with a between two critical values produce gravitational wave echoes whose frequencies and damping evolve with the bounce parameter, and these echoes are qualitatively mirrored by extra photon rings in thin-disk images.
Alves Batista,et al.Class
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Quasi-normal modes and echoes of generalized black hole bounces and their correspondence with shadows
In a generalized black bounce spacetime, horizonless configurations with a between two critical values produce gravitational wave echoes whose frequencies and damping evolve with the bounce parameter, and these echoes are qualitatively mirrored by extra photon rings in thin-disk images.