Kavli Affiliate: Ke Wang
| First 5 Authors: Xiao-Xiong Zeng, Xiao-Xiong Zeng, , ,
| Summary:
In this paper, we investigate the power and efficiency of energy extraction
through magnetic reconnection in the Kerr-Sen-AdS$_4$ black hole, with a
primary focus on both the circular orbit and plunging region. We plot the
allowed regions for energy extraction and present corresponding power and
efficiency values, comparing them with those of the Blandford-Znajek (BZ)
mechanism. Our analysis reveals that energy extraction remains feasible even at
a spin parameter as low as 0.5, significantly below previously reported
thresholds, and the extracted power can exceed that of the BZ process under
certain conditions. Furthermore, the dilatonic scalar charge $b$ and the AdS
radius $l$ collectively contribute to lowering the spin threshold for energy
extraction. The energy extraction process in the plunging region was further
examined by analyzing the permissible energy extraction region, as well as the
corresponding power output and efficiency. One can find that the energy
extraction is possible even at a spin as low as 0.25. Crucially, parameter $b$
actively lowers the energy extraction spin threshold, while parameter $l$
exerts a counteracting effect, impeding such reduction. This trend shows a
marked contrast with circular orbit behavior. Additionally, both power and
efficiency in the plunging region consistently surpass those in the circular
orbit region, indicating superior energy extraction capability in plunging
region.
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