Würzburg 2018 – scientific programme

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GR: Fachverband Gravitation und Relativitätstheorie

GR 6: Relativistic astrophysics II

GR 6.5: Talk

Wednesday, March 21, 2018, 15:20–15:40, NW-Bau - HS3

Equilibrium of charged perfect fluid around a Kerr black hole: role of the spin — •Audrey Trova¹, Kris Schroven¹, Jiří Kovář², Petr Slaný², Vladimir Karas³, and Eva Hackmann¹ — ¹University of Bremen, Center of Applied Space Technology and Microgravity (ZARM), 28359 Bremen, Germany — ²Institute of Physics, Faculty of Philosophy and Science, Silesian University in Opava
Bezručovo nám. 13, CZ-746 01 Opava, Czech Republic — ³Astronomical Institute, Academy of Sciences, Boční II, CZ-141 31 Prague, Czech Republic

Studies of equilibrium of toroidal structures of a perfect fluid are important to understand the physics of accretion disks. Here, we are presenting an analytical approach for the equilibrium of charged-perfect fluid surrounding a rotating black hole, embedded in an asymptotically large scale uniform magnetic field. The vertical and radial structure of the torus are influenced by the balance between the gravitational and the magnetic force. Following our previous study of rotating charged test fluid around a non rotating black hole, this time, we show that according to the spin of the black hole the area of existence of such structures change. In this work, we focus our attention on orbiting structures in permanent rigid rotation. We prove, in this rotating case also, the existence of equilibrium configurations in the equatorial plane and on the polar axis such as charged polar clouds. Moreover, we show that the rotation of the black hole has a crucial role in the existence of such structures.