The astrophysics of rotational energy extraction from a black hole
David Garofalo, Chandra B. Singh
TL;DR
This paper examines the astrophysical mechanisms for extracting rotational energy from black holes, affirming the validity of the Blandford-Znajek effect while highlighting unresolved questions about black hole electric properties.
Contribution
It clarifies the conditions under which electromagnetic energy extraction from black holes is feasible and discusses the limitations of current understanding regarding black hole electric charge.
Findings
The Blandford-Znajek effect is confirmed as a valid energy extraction mechanism.
The electric nature of black holes remains an unresolved aspect.
Proper treatment of curved spacetime is essential for accurate astrophysical modeling.
Abstract
Recent work has called into question whether nature can extract the rotational energy of a black hole via electromagnetic fields by appealing to an alleged ability to absorb current. We describe the strategies needed to properly treat the astrophysics in curved spacetime near black holes, showing that while the Blandford-Znajek effect is sound, the deeper nature of the electric nature of black holes remains unresolved.
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