Light rings and long-lived modes in quasiblack hole spacetimes
Light rings and long-lived modes in quasiblack hole spacetimes
复制标题
准黑洞时空中的光环和长寿命模式
DOI：
10.1103/physrevd.105.024049
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发表时间：
2021-08
影响因子：
5
通讯作者：
Sijie Gao
中科院分区：
文献类型：
--
作者：
Minyong Guo;Zhen Zhong;Jinguang Wang;Sijie Gao
It has been argued that ultracompact objects, which possess light rings but no horizons, may be unstable against gravitational perturbations. To test this conjecture, we revisit the quasi-black hole solutions, a family of horizonless spacetimes whose limit is the extremal Reissner-Nordstr\"om black hole. We find a critical parameter at which the light rings just appear. We then calculate the quasinormal modes of the quasi-black holes. Both the WKB result and the numerical result show that long-live modes survive for the range where light rings exist, indicating that horizonless spacetimes with light rings are unstable. Our work provides a strong and explicit example that light rings could be direct observational evidence for black holes.
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DOI：
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