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gr-qc2024
On the physical significance of black hole quasinormal mode spectra instability
Vitor Cardoso, Shilpa Kastha, Rodrigo Panosso Macedo
It has been shown, via specific examples and a pseudospectrum analysis, that the black hole quasinormal spectra are unstable. The implication of such a result for gravitational-wav…
gr-qc2024
Constraining parametric deviations from the Kerr spacetime using black hole ringdowns of GW150914 and GW190521
Zaryab Ahmed, Shilpa Kastha, Alex B. Nielsen
The ringdown phase of a binary black hole merger is modelled by the quasi-normal modes of a perturbed Kerr black hole. According to the black hole no-hair theorem, the emitted ring…