AI 中文总结
本文研究四维爱因斯坦-高斯-博内特引力旋转黑洞的磁重联能量提取，发现其自旋阈值低于此前结果，plunge regime的功率更高，α参数可降低阈值。
AI 中文摘要
近期，Comisso和Asenjo提出了一种基于能层内等离子体磁重联的新型能量提取机制。本文分析了旋转四维爱因斯坦-高斯-博内特引力黑洞通过磁重联实现能量提取的功率与效率。首先，我们分析了该时空的背景性质及其物理量，包括事件视界、能层边界和能层大小；研究了圆轨道中的磁重联，探讨了能量提取区域、能量提取的功率与效率。结果表明，即使自旋参数低至0.4，能量提取仍可行，该值远低于此前报道的阈值；还发现能量提取功率超过Blandford-Znajek机制的功率，高斯-博内特耦合参数α会降低能量提取的自旋阈值。同样，我们分析了 plunge regime（ plunge regime 指物质向黑洞下落的 plunge 阶段，此处保留英文原名）中的能量提取区域、对应功率与效率，发现即使自旋参数低至0.22，能量提取仍可能实现，且高斯-博内特耦合参数α会进一步降低自旋阈值，该行为与圆轨道情况一致。最后，我们对比了plunge regime与圆轨道情况的能量提取功率，发现plunge regime的能量提取功率高于圆轨道情况。
英文摘要
Recently, Comisso and Asenjo proposed a new mechanism for energy extraction based on magnetic reconnection of plasma within the ergosphere. In this paper, we analyze the power and efficiency of energy extraction through magnetic reconnection in a rotating four-dimensional Einstein-Gauss-Bonnet gravity black hole. Firstly, we analyze the background properties of this spacetime and its physical quantities, including the event horizon, the boundary of the ergosphere, and the size of the ergosphere. We analyze the magnetic reconnection in circular orbits and investigate the energy extraction region, as well as the power and efficiency of energy extraction. Our results indicate that energy extraction remains feasible even for a low spin parameter of $0.4$, which is well below the previously reported threshold. We also find that the energy extraction power exceeds that of the Blandford-Znajek mechanism. The Gauss-Bonnet coupling parameters $α$ lower the spin threshold for energy extraction. Similarly, we analyze the energy extraction region in the plunging regime, together with the corresponding power and efficiency. We find that energy extraction is possible even for a low spin parameter as $0.22$. We also observe that the Gauss-Bonnet coupling parameter $α$ further lowers the spin threshold. This behavior is consistent with that observed in the circular orbit case. Finally, we compare the energy extraction power in the plunging and circular orbit regimes and find that the plunging regime yields a higher energy extraction power than the circular orbit case.
