标题： 旋转非Kerr黑洞和能量提取 显示英文标题

标题： Rotating non-Kerr black hole and energy extraction

摘要： 旋转非Kerr黑洞的能层性质及通过彭罗斯过程提取能量的情况被研究。 结果显示，能层对变形参数$\epsilon$敏感，随着参数$\epsilon$的增加，能层的形状变得厚重。 值得注意的是，与Kerr黑洞相比，变形参数$\epsilon$可以大大增强能量提取过程的最大效率。 特别是对于$a>M$的情况，非Kerr度规描述了一个超自转致密天体，最大效率可以超过60%，而极端Kerr黑洞的效率仅为20.7%。 显示英文摘要

摘要： The properties of the ergosphere and energy extraction by Penrose process in a rotating non-Kerr black hole are investigated. It is shown that the ergosphere is sensitive to the deformation parameter $\epsilon$ and the shape of the ergosphere becomes thick with increase of the parameter $\epsilon$. It is of interest to note that, comparing with the Kerr black hole, the deformation parameter $\epsilon$ can enhance the maximum efficiency of the energy extraction process greatly. Especially, for the case of $a>M$, the non-Kerr metric describes a superspinning compact object and the maximum efficiency can exceed 60%, while it is only 20.7% for the extremal Kerr black hole.