On black hole area quantization and echoes

Abstract

In this work we argue that black hole area quantization of Bekenstein and Mukhanov should not give rise to measurable effects in terms of so-called gravitational wave echoes during black hole mergers. We outline that the quantum spectrum of a black hole should be washed out during and after black hole mergers, and hence one should not expect echoes in this scenario. The extreme broadening of the spectrum is due to the large particle emission rate during ringdown. Our results question key assumptions being made in recent literature on this topic.

Quasinormal modes and Hawking radiation sparsity of GUP corrected black holes in bumblebee gravity with topological defects

“…Therefore, we can conclude that the Hawking radiation power emitted is also quantized and the quantization is affected by the Lorentz violation. Recent studies show the impacts of area quantization of black holes on GW echoes [44][45][46]. So, it can be possible in the near future to comment on the fate of quantum gravity and Lorentz violation provided we have sufficient astrophysical signatures.…”

“…Finally, we perform a study on the area of the black holes with the help of the adiabatic invariance method. Since, the area of black holes is connected with the GW echo [44][45][46], entropy spectrum and power spectrum of black holes, we believe the results can be further used to study the impacts of Lorentz violation on different aspects of black holes.…”

Naked singularity in 4D Einstein-Gauss-Bonnet novel gravity: Echoes and (in)-stability

“…The presence of echoes has also been associated with modified theories of gravity [72] and existence of higher dimensions [73,74]. Echoes in gravitational waves is also expected to bear signatures of quantum gravity via quantization of the black hole area [75,76], although, Coates et al [77] have argued differently. For a detailed review on echoes in gravitational wave, we refer the reader to the excellent review by Cardoso and Pani [78].…”