Enhanced energy extraction via magnetic reconnection in Kerr-AdS spacetime

TL;DR

This study investigates how a negative cosmological constant in Kerr-AdS black holes enhances energy extraction through magnetic reconnection, expanding the conditions and efficiency compared to asymptotically flat black holes.

Contribution

It reveals the significant influence of the cosmological constant on energy extraction efficiency and conditions in Kerr-AdS black holes, a novel insight in black hole physics.

Findings

Negative cosmological constant extends energy extraction regions.

Energy extraction is possible from low-spin Kerr-AdS black holes.

Enhanced energy, efficiency, and power with more negative cosmological constant.

Abstract

In this paper, we study the energy extraction from Kerr-AdS black holes following the magnetic reconnection process. The parameter space regions that satisfy the energy extraction condition, as well as the efficiency and power of the extracted energy, are analyzed. The study shows that the presence of a negative cosmological constant extends the range of dominant reconnection radial locations where the energy extraction condition is met, and enables energy extraction even from black holes with relatively low spin. Furthermore, the influence of the negative cosmological constant on energy extraction is modulated by the extent of the dominant reconnection radial region: a more negative cosmological constant enhances the extracted energy, efficiency, and power, particularly for smaller dominant reconnection radii. These results demonstrate that the energy extraction from Kerr-AdS black holes is more favorable than that from their asymptotically flat counterparts. Our results highlight the crucial role of the cosmological constant in energy extraction via magnetic reconnection.