Zobrazeno 1 - 10
of 927
pro vyhledávání: '"Destounis, A."'
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 surrounded by various matter environments, proportional to the compac
Externí odkaz:
http://arxiv.org/abs/2412.18651
Astrophysical environments are ubiquitous in the Universe; from accretion disks around black holes to galactic dark matter halos, distributions of astrophysical material veil the vast majority of Cosmos. Including environmental effects in strong-fiel
Externí odkaz:
http://arxiv.org/abs/2410.11952
Publikováno v:
Phys. Rev. D 110, 124004 (2024)
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 order to comprehend how it drives extreme-mass-ratio binaries, that are
Externí odkaz:
http://arxiv.org/abs/2408.02004
Publikováno v:
Phys. Rev. D 110, L121501 (2024)
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 deformations of the system and describes the linear response only in a certain (
Externí odkaz:
http://arxiv.org/abs/2406.01692
Autor:
Boyanov, Valentin, Cardoso, Vitor, Destounis, Kyriakos, Jaramillo, José Luis, Macedo, Rodrigo Panosso
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 useful to further our understanding regarding certain physical processe
Externí odkaz:
http://arxiv.org/abs/2312.11998
Publikováno v:
Phys. Rev. D 109, 044023 (2024)
Pseudospectral analyses have broadened our understanding of ringdown waveforms from binary remnants, by providing insight into both the stability of their characteristic frequencies under environmental perturbations, as well as the underlying transie
Externí odkaz:
http://arxiv.org/abs/2312.11630
Autor:
Destounis, Kyriakos, Duque, Francisco
Publikováno v:
Black-Hole Spectroscopy: Quasinormal Modes, Ringdown Stability and the Pseudospectrum. In: Papantonopoulos, E., Mavromatos, N. (eds) Compact Objects in the Universe (2024)
Black-hole spectroscopy is a powerful tool to probe the Kerr nature of astrophysical compact objects and their environment. The observation of multiple ringdown modes in gravitational waveforms could soon lead to high-precision gravitational-wave spe
Externí odkaz:
http://arxiv.org/abs/2308.16227
Publikováno v:
Phys. Rev. D 108, 104027 (2023)
Recent studies have shown that quasinormal modes suffer from spectral instabilities, a frailty of black holes that leads to disproportional migration of their spectra in the complex plane when black-hole effective potentials are modified by minuscule
Externí odkaz:
http://arxiv.org/abs/2307.11155
Publikováno v:
Gen Relativ Gravit 55, 123 (2023)
X-ray astronomy provides information regarding the electromagnetic emission of active galactic nuclei and X-ray binaries. These events provide details regarding the astrophysical environment of black holes and stars, and help us understand gamma-ray
Externí odkaz:
http://arxiv.org/abs/2305.18522
Publikováno v:
Phys. Rev. D 108 (2023) 8, 084062
General relativity predicts that black holes are described by the Kerr metric, which has integrable geodesics. This property is crucial to produce accurate waveforms from extreme-mass-ratio inspirals. Astrophysical environments, modifications of grav
Externí odkaz:
http://arxiv.org/abs/2305.05691