期刊
PHYSICAL REVIEW D
卷 94, 期 12, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.94.124039
关键词
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资金
- JSPS KAKENHI [JP16K17704, JP14J03387]
- MEXT-Supported Program for the Strategic Research Foundation at Private Universities
- Grants-in-Aid for Scientific Research [14J03387, 16K17704] Funding Source: KAKEN
In this paper, we show that a rigidly rotating string can extract the rotational energy from a rotating black hole. We consider Nambu-Goto strings stationary with respect to a corotating Killing vector with an uniform angular velocity. in the Kerr spacetime. We show that a necessary condition of the energyextraction process is that an effective horizon on the string world sheet, which corresponds to the inner light surface, is inside the ergosphere of the Kerr black hole and the angular velocity. is less than that of the black hole Oh. Furthermore, we discuss global configurations of such strings in both of a slow-rotation limit and the extremal Kerr case.
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