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Quasinormal modes of black holes embedded in halos of matter
Laura Pezzella, Kyriakos Destounis, Andrea Maselli +1
We investigate the (axial) quasinormal modes of black holes embedded in generic matter profiles. Our results reveal that the axial QNMs experience a redshift when the black hole is…
Superradiance of charged black holes embedded in dark matter halos
Alessandro Mollicone, Kyriakos Destounis
Astrophysical environments are ubiquitous in the Universe; from accretion disks around black holes to galactic dark matter halos, distributions of astrophysical material veil the v…
Resonant excitation of eccentricity in spherical extreme-mass-ratio inspirals
Areti Eleni, Kyriakos Destounis, Theocharis A. Apostolatos +1
Gravitational radiation reaction, has been one of the fundamental issues in general relativity. Over a span of decades, this process has been analyzed in the adiabatic limit, in or…
Ringdown stability: greybody factors as stable gravitational-wave observables
Romeo Felice Rosato, Kyriakos Destounis, Paolo Pani
The quasinormal mode spectrum of black holes plays a crucial role in the modelling of post-merger ringdown signals. However, the spectrum is extremely sensitive to small deformatio…
Pseudospectrum of de Sitter black holes
Kyriakos Destounis, Valentin Boyanov, Rodrigo Panosso Macedo
Pseudospectral analyses have broadened our understanding of ringdown waveforms from binary remnants, by providing insight into both the stability of their characteristic frequencie…