115 citations · 554 across the 23 of their papers we have counts for
18 papers · 1 filter
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…
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…
Relativistic and Newtonian fluid tori with electric charge
Vladimir Karas, Ondrej Kopacek, Audrey Trova +3
We discuss the effects of electric charging on the equilibrium configurations of magnetized, rotating fluid tori around black holes of different mass. In the context of gaseous/dus…
Oblique magnetic fields and the role of frame dragging
Vladimir Karas, Ondrej Kopacek, Devaky Kunneriath +1
Magnetic null points can develop near the ergosphere boundary of a rotating black hole by the combined effects of strong gravitational field and the frame-dragging mechanism. The e…