69 citations · 191 across the 13 of their papers we have counts for
13 papers
Exceptional Points and Resonance in Black Hole Ringdown
Rodrigo Panosso Macedo, Takuya Katagiri, Kei-ichiro Kubota +1
We propose an exceptional-point (EP) framework for black-hole ringdown beyond the standard quasinormal-mode (QNM) paradigm. It provides a first-principles characterization of the r…
Asymptotics and Universality in Black Holes: from the quasinormal Weyl's law to the binary merger waveform
José Luis Jaramillo, Lamis Al Sheikh, Jérémy Besson +7
Current state-of-the-art approaches to black hole (BH) dynamics, encompassing several effective approximation schemes, offer a remarkable control of the quantitative aspects of str…
Total absorption of tailored incoming signals by black holes
Furkan Tuncer, Vitor Cardoso, Rodrigo Panosso Macedo +1
We uncover a new class of phenomena in gravitational physics, whereby resonances in the complex plane can be excited via tailored time-dependent scattering. We show that specific f…
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…
Gravitational-wave tails and memory effect for mergers in astrophysical environments
Qassim Alnasheet, Vitor Cardoso, Francisco Duque +1
Gravitational waves from the coalescence of compact objects carry information about their dynamics and the spacetime in regions where they are evolving. In particular, late-time ta…
Limiting geometry and spectral instability in Schwarzschild--de Sitter spacetimes
Yi Zhou, Rodrigo Panosso Macedo
We revisit the quasinormal mode (QNM) problem in Schwarzschild--de Sitter spacetimes providing a unified infrastructure tailored for studying limiting configurations. Geometrically…
Pseudospectrum of rotating analog black holes
Lucas Tobias de Paula, Pedro Henrique Croti Siqueira, Rodrigo Panosso Macedo +1
Analyzing the stability of quasinormal modes (QNM) is essential for understanding black hole dynamics, particularly in the context of gravitational wave emissions and black hole sp…
Black hole spectral instabilities in the laboratory: Shallow water analogue
Mateus Malato Corrêa, Caio F. B. Macedo, Rodrigo Panosso Macedo +1
Small deviations in the spacetime around black holes can lead to instabilities in the underlying quasinormal mode spectrum, potentially altering the hierarchy of its overtones. A p…
Probing the Unstable Spectrum of Schwarzschild-like Black Holes
Pedro Henrique Croti Siqueira, Lucas Tobias de Paula, Rodrigo Panosso Macedo +1
We investigate the pseudospectrum of a Schwarzschild-like spacetime within the framework of black hole perturbation theory to analyze a counterintuitive assertion regarding the ins…
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…
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…
Structural aspects of the anti-de Sitter black hole pseudospectrum
Valentin Boyanov, Vitor Cardoso, Kyriakos Destounis +2
Black holes in anti-de Sitter spacetime provide an important testing ground for both gravitational and field-theoretic phenomena. In particular, the study of perturbations can be u…
Pseudospectrum of horizonless compact objects: a bootstrap instability mechanism
Valentin Boyanov, Kyriakos Destounis, Rodrigo Panosso Macedo +2
Recent investigations of the pseudospectrum in black hole spacetimes have shown that quasinormal mode frequencies suffer from spectral instabilities. This phenomenon may severely a…