Electro-Magnetic Energy Extraction from Rotating Black Holes in AdS

TL;DR

This paper develops new solutions for energy extraction via force-free electrodynamics around rotating black holes in Anti de Sitter space, extending understanding of black hole energy processes in these geometries.

Contribution

It introduces novel force-free electrodynamics solutions in AdS black hole backgrounds, including Near Horizon Extremal Kerr and Super-Entropic geometries, with a focus on energy flux measurement.

Findings

New energy extracting solutions in AdS black hole geometries.

Energy flux measured by rotating observers is key to understanding extraction.

Applications to Kerr, AdS-Kerr, and BTZ black holes demonstrate the approach.

Abstract

Force-Free Electrodynamics for black holes in Anti de Sitter is considered. We present new, energy extracting solutions of Force-Free Electrodynamics in Anti de Sitter - Near Horizon Extremal Kerr and Super-Entropic Near Horizon Extremal Kerr geometries. The relevant equations of motion are derived from an action for force-free plasma surrounding spinning black holes with generic asymptotics. We consider the energy flux of electrodynamic fields in rotating frames to argue that the correct measure for energy extraction is the energy flux measured by a rotating observer in the near horizon region. We illustrate this procedure by application to near horizon solutions in Kerr, AdS-Kerr and BTZ.