期刊
ASTROPHYSICAL JOURNAL
卷 751, 期 2, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/751/2/148
关键词
black hole physics; gravitation
资金
- National Natural Science Foundation of China [11175065, 10935013]
- National Basic Research of China [2010CB833004]
- SRFDP [20114306110003, IRT0964]
- Hunan Provincial Natural Science Foundation of China [11JJ7001]
- Hunan Provincial Innovation Foundation for Postgraduate [CX2011B185]
- Construct Program of the National Key Discipline
The properties of the ergosphere and energy extraction by the 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 as parameter epsilon increases. It is of interest to note that, compared 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.
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