Physical significance of the black hole quasinormal mode spectra instability

Apr 1, 2024
9 pages
Published in:
  • Phys.Rev.D 110 (2024) 2, 024016
  • Published: Jul 8, 2024
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DOI:

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Abstract: (APS)
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-wave physics and of our understanding of black holes is, still, unclear. The purpose of this work is twofold: (i) we show that some of the setups leading to instabilities are unphysical and triggered by exotic matter or extreme spacetimes; (ii) nevertheless, we also show simple examples of compelling physical scenarios leading to spectral instabilities. Our results highlight the importance of understanding the overtone content of time-domain waveforms, and their detectability.
Note:
  • 9 pages, 3 figures
  • quasinormal mode: spectrum
  • black hole: quasinormal mode
  • matter: exotic
  • stability
  • spectral
  • space-time
  • gravitational radiation
  • wave function
  • field theory: scalar: massive
  • Klein-Gordon equation