Magnetic Extraction of Spin Energy from a Black Hole

Abstract

Numerous variations have been proposed on the original suggestion by Blandford and Znajek that magnetic fields could be used to extract rotational energy from black holes. A new categorization of these variations is proposed so that they may be considered in a systematic way. "Black hole spindown" is defined more precisely, distinguishing decrease in the spin parameter a/M from decreases in angular momentum a and rotational kinetic energy, M - M_i. Several key physical questions are raised: Can the "stretched horizon" of a black hole communicate with the outside world? Do accretion disks bring any net magnetic flux to the black holes at their centers? Is the magnetic field adjacent to a black hole force-free everywhere?

to appear in "Explosive Phenomena in Astrophysical Compact Objects, Proceedings of the 1st KIAS Astrophysics Workshop"

Cited by in corpus (2)

• Accretion Disk Torqued by a Black Hole
• Hyper- and suspended-accretion states of rotating black holes and the durations of gamma-ray bursts