Moving away from the near-horizon attractor of the extreme Kerr force-free magnetosphere

0540688 - FZÚ 2021 RIV GB eng J - Journal Article
Camilloni, R. - Grignani, G. - Harmark, T. - Oliveri, Roberto - Orselli, M.
Moving away from the near-horizon attractor of the extreme Kerr force-free magnetosphere.
Journal of Cosmology and Astroparticle Physics. Roč. 2020, č. 10 (2020), s. 1-29, č. článku 048. ISSN 1475-7516. E-ISSN 1475-7516
R&D Projects: GA MŠMT EF15_003/0000437
Grant - others:OP VVV - CoGraDS(XE) CZ.02.1.01/0.0/0.0/15_003/0000437
Institutional support: RVO:68378271
Keywords : black-hole Kerr * symmetry: axial * electromagnetic field * electrodynamics * horizon
OECD category: Particles and field physics
Impact factor: 5.839, year: 2020
Method of publishing: Limited access
https://doi.org/10.1088/1475-7516/2020/10/048

We consider force-free magnetospheres around the extreme Kerr black hole. In this case there is no known exact analytic solution to force free electrodynamics which is stationary, axisymmetric and magnetically-dominated. However, any stationary, axisymmetric and regular force-free magnetosphere in extreme Kerr black hole approaches the same attractor solution in the near-horizon extreme Kerr (NHEK) limit with null electromagnetic field. We show that by moving away from the attractor solution in the NHEK region, one finds magnetically-dominated solutions in the extreme Kerr black hole with finite angular momentum outflow. This result is achieved using a perturbative analysis up to the second order.

Permanent Link: http://hdl.handle.net/11104/0318306