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Spectral instability of horizonless compact objects within astrophysical environments
Kyriakos Destounis, Mateus Malato Corrêa, Caio F. B. Macedo +1
Recent non-modal analyses have uncovered spectral instabilities in the quasinormal-mode spectrum of black holes; a phenomenon that intriguingly extends to spherically-symmetric exo…
Overdamped quasibound states inside a Schwarzschild black hole
Jeff Steinhauer, Kyriakos Destounis, Richard Brito
Schwarzschild black-hole interiors, bounded by event horizons and terminated by spacelike singularities, are regions where all physical observers are inevitably destroyed. In the g…
Environmentally-induced chaos: Extreme-mass-ratio systems of rotating black holes in astrophysical environments
Kyriakos Destounis, Pedro G. S. Fernandes
Extreme-mass-ratio inspirals, in which a stellar-mass object orbits a supermassive black hole, are prime sources of millihertz gravitational waves for upcoming space-based detector…
Lensing by black holes within astrophysical environments
Gerasimos Kouniatalis, Arthur G. Suvorov, Kyriakos Destounis
Astrophysical black holes are likely to be surrounded by various forms of matter in the form of disks or halos. While a number of studies have examined the impact of an environment…
Vortices without inflow: bound spectra in horizonless rotational analogs
H. S. Vieira, Kyriakos Destounis
Analog gravity experiments are making remarkable strides in unveiling both the classical and quantum nature of black holes. By harnessing diverse states of matter, contemporary tab…
Black hole spectroscopy: from theory to experiment
Emanuele Berti, Vitor Cardoso, Gregorio Carullo +65
The "ringdown" radiation emitted by oscillating black holes has great scientific potential. By carefully predicting the frequencies and amplitudes of black hole quasinormal modes a…
Cumulative effect of orbital resonances in extreme-mass-ratio inspirals
Edoardo Levati, Alejandro Cárdenas-Avendaño, Kyriakos Destounis +1
Orbital resonances in extreme-mass-ratio inspirals (EMRIs) have been proven to be a key feature for accurate gravitational-wave template modeling. Decades of research have led to s…
Perturbing the vortex: quasinormal and quasibound spectra of rotating acoustic geometries
H. S. Vieira, Kyriakos Destounis, Kostas D. Kokkotas
Strong-field gravity simulators are laboratory experiments that can investigate a wide range of both classical and quantum phenomena occurring in nature. In this work, we introduce…