München 2019 – scientific programme

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GR: Fachverband Gravitation und Relativitätstheorie

GR 10: GR and Astrophysics I

GR 10.5: Talk

Thursday, March 21, 2019, 12:30–12:45, HS 4

The influence of electromagnetic fields on the ISCO in Schwarzschild spacetime — Jan Hackstein and •Eva Hackmann — ZARM, University of Bremen

Astrophysical black holes are often surrounded by a geometrically thin accretion disk, whose inner edge is approximately given by the innermost stable circular orbit (ISCO) of test particles. Moreover, they are usually embedded in magnetic fields, for instance of interstellar origin. The rotation of a black hole then enables selective accretion of charged particles, leading to a small net electric charge. Here we discuss the influence of electromagnetic test fields, which do not influence the spacetime geometry, on the radius of the ISCO of charged particles in the equatorial plane of a (non-rotating) Schwarzschild black hole.