Blandford-Znajek mechanism in the general stationary axially-symmetric black-hole spacetime. Issue 12 (1st December 2021)

• Record Type: Journal Article
• Authors: Konoplya, R.A.; Kunz, J.; Zhidenko, A.
• Is Part Of: Journal of cosmology and astroparticle physics. Volume 2021:Issue 12(2021)
• Publication Date: 2021-12-01
• Subjects: GR black holes -- gravity -- magnetic fields -- modified gravity; Cosmology -- Periodicals; Astrophysics -- Periodicals; 523.0105
• DOI: 10.1088/1475-7516/2021/12/002
• Languages: English
• ISSNs: 1475-7516

Abstract

Abstract: We consider the Blandford-Znajek process of electromagnetic extraction of energy from a general axially symmetric asymptotically flat slowly rotating black hole. Using the general parametrization of the black-hole spacetime we construct formulas for the flux of the magnetic field and the rate of energy extraction, which are valid not only for the Kerr spacetime, but also for its arbitrary axially symmetric deformations. We show that in the dominant order these quantities depend only on a single deformation parameter, which relates the spin frequency of a black hole with its rotation parameter.