articlePhysical review. D/Physical review. D.Jan 27, 2026GREEN OA

Spectral instability of horizonless compact objects within astrophysical environments

KDKyriakos DestounisMMMateus Malato CorrêaCFCaio F. B. MacedoRPRodrigo Panosso Macedo

University of Lisbon · Universidade Federal do Pará

Indexed inarxivcrossrefdatacite

Abstract

Recent non-modal analyses have uncovered spectral instabilities in the quasinormal-mode spectrum of black holes; a phenomenon that intriguingly extends to spherically-symmetric exotic compact objects. These results point to a sensitivity of the spectrum with potentially far-reaching implications for black-hole spectroscopy. At the same time, growing attention has turned to astrophysical environments around compact objects and their role in shaping gravitational-wave astrophysics. In this work, we establish a direct link between spectral instabilities and environmental effects by modeling matter as a localized bump outside the light ring of a spectrally-unstable exotic compact object with a purely reflective…

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Topics & keywords

Topics
Keywords
  • Instability
  • Electromagnetic spectrum
  • Spectrum (functional analysis)
  • Spectral signature
  • Point (geometry)
  • Modal
  • Spectral density
  • Noise (video)
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