115 citations · 554 across the 23 of their papers we have counts for
25 papers
Combining Machine Learning with Recurrence Analysis for resonance detection
Ondřej Zelenka, Ondřej Kopáček, Georgios Lukes-Gerakopoulos
The width of a resonance in a nearly integrable system, i.e. in a non-integrable system where chaotic motion is still not prominent, can tell us how a perturbation parameter is dri…
On Innermost Stable Spherical Orbits near a rotating black hole: A numerical study of the particle motion near the plunging region
Ondřej Kopáček, Vladimír Karas
According to General Relativity, astrophysical black holes are described by a small number of parameters. Apart from the mass of the black hole (M), among the most interesting char…
Resonance crossing of a charged body in a magnetized Kerr background: an analogue of extreme mass ratio inspiral
Sajal Mukherjee, Ondrej Kopacek, Georgios Lukes-Gerakopoulos
We investigate resonance crossings of a charged body moving around a Kerr black hole immersed in an external homogeneous magnetic field. This system can serve as an electromagnetic…
Magnetized black holes: the role of rotation, boost, and accretion in twisting the field lines and accelerating particles
Ondrej Kopacek, Vladimir Karas
Combined influence of rotation of a black hole and ambient magnetic fields creates conditions for powerful astrophysical processes of accretion and outflow of matter which are obse…
Near-horizon structure of escape zones of electrically charged particles around weakly magnetized rotating black hole: case of oblique magnetosphere
Vladimir Karas, Ondrej Kopacek
We study the effects of large scale magnetic fields on the dynamics of charged particles near a rotating black hole. We consider a scenario in which the initially neutral particles…
Near-horizon structure of escape zones of electrically charged particles around weakly magnetized rotating black hole. II. Acceleration and escape in the oblique magnetosphere
Ondřej Kopáček, Vladimír Karas
Strong gravity and magnetic fields are key ingredients that power processes of accretion and ejection near compact objects. While the particular mechanisms that operate here are st…