10–14 Nov 2025
Europe/Prague timezone

Plunging to and escaping from a spherical orbit near a rotating black hole

11 Nov 2025, 11:30
40m
Keynote

Speaker

Vladimír Karas (Astronomical Institute of the Czech Academy of Sciences)

Description

We explore off-equatorial acceleration of electrically charged matter near a magnetized black hole with the aim of understanding the boundaries between the regions of stable, plunging, and escaping motion. As a generalisation of the Innermost Stable Circular Orbit, the concept of the radius of the Innermost Stable Spherical Orbit determines the inner rim of inclined accretion/ejection process. We demonstrate that the region of bound orbits has a complicated structure due to enhanced precession in strong gravity.

Primary author

Vladimír Karas (Astronomical Institute of the Czech Academy of Sciences)

Co-author

Dr Ondřej Kopáček (Faculty of Science, Humanities, and Education, Technical University of Liberec)

Presentation materials

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