快速旋转非Kerr黑洞与能量挖掘.docVIP

快速旋转非Kerr黑洞与能量挖掘 刘长青，陈松柏，荆继良 湖南师范大学物理与信息科学学院，长沙市 410081 摘要：本文研究了快速旋转非Kerr 黑洞的能层结构和由Penrose过程从该黑洞的能量提取。研 究表明偏离参数? 的微小变化会引起旋转非克尔黑洞能层结构的激变，能层厚度随?的增大而增 加。特别令人感兴趣的是，与Kerr 黑洞相比，偏离参数能极大地提高从天文黑洞能量提取效 率。如当a M时，旋转非Kerr紧致天体的能量提取效率可超过60%，远大于广义相对论理论 所描述的极端Kerr黑洞20.7%。 关键词：能量挖掘，旋转非Kerr黑洞，Penrose过程 中图分类号： 0470Dy, 9530Sf, 9760Lf Rotating non-Kerr black hole and energy extraction Changqing Liu, Songbai Chen, Jiliang Jing Department of Physics, Hunan Normal University, Changsha, 410081 Abstract: The properties of the ergosphere region and the energy extraction by Penrose process in a rotating non-Kerr black hole are investigated. It is shown that the ergosphere region is sensitive to the deformation parameter ? and the relative shape of the ergosphere becomes thick with increase of the parameter ?. It is of interest to note that, comparing with the Kerr black hole, the deformation parameter ? enhances the maximum e?ciency of the energy extraction process. Especially, for the case of a M, the non-Kerr metric describes a superspinning compact object and the maximum e?ciency can exceed 60%, while it is only 20.7% for the extremal Kerr black hole. Key words: Energy Extraction, Rotating non-Kerr black hole, Penrose process 基金项目： This work was supported by the National Natural Science Foundation of China under Grant No. the SRFDP under Grant No. 20114306110003 and Hunan Provincial Innovation Foundation For Postgraduate under Grant No CX2011B185. 作者简介： Changqing Liu（1979-），male，doctoral student，major research direction：theoretical physics. Song- bai Chen (1972-), male，professor，major research direction：theoretical physics. Correspondence author：Jiliang Jing （1955-），male，professor，major research direction：theoretical physics ? 通讯作者, 电子邮箱: jljing@hunnu.edu.cn  -1- 0  Introduction In 4-dimensional general relativity, no-hair theorem [1] guarantees that a neutral rotating astrophysical black hole is uniquely described by the Kerr metric only with two parameters,