On the nature of the Blandford-Znajek mechanism

TL;DR

This paper challenges the common view that the event horizon is central to the Blandford-Znajek mechanism, proposing instead that the ergospheric region's properties are key to understanding energy extraction from rotating black holes.

Contribution

It offers a new perspective by emphasizing the ergospheric region over the event horizon in explaining the Blandford-Znajek mechanism.

Findings

The ergospheric region is crucial for energy extraction.

The traditional membrane paradigm may be misleading.

Proper understanding requires focusing on the ergosphere.

Abstract

It is widely accepted in the astrophysical community that the event horizon plays crucial role in the Blandford-Znajek mechanism of extraction of rotational energy of black holes. In fact, this view is a quintessence of the Membrane Paradigm of black holes which suggests that the event horizon, or rather the so-called stretched horizon, is similar to a rotating conducting sphere of finite resistivity. In this paper we argue that this interpretation is rather misleading and the proper explanation of the Blandford-Znajek mechanism has to be sought in the properties of the ergospheric region of black holes.