期刊
PHYSICAL REVIEW LETTERS
卷 116, 期 17, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.116.171101
关键词
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资金
- European Union's H2020 ERC Consolidator Grant Matter and strong-field gravity: New frontiers in Einstein's theory [MaGRaTh-646597]
- Government of Canada through Industry Canada
- Province of Ontario through the Ministry of Economic Development and Innovation
- FCT-Portugal [IF/00293/2013]
- H2020-MSCA-RISE [StronGrHEP-690904]
- NewCompstar (COST action) [MP1304]
It is commonly believed that the ringdown signal from a binary coalescence provides a conclusive proof for the formation of an event horizon after the merger. This expectation is based on the assumption that the ringdown waveform at intermediate times is dominated by the quasinormal modes of the final object. We point out that this assumption should be taken with great care, and that very compact objects with a light ring will display a similar ringdown stage, even when their quasinormal-mode spectrum is completely different from that of a black hole. In other words, universal ringdown waveforms indicate the presence of light rings, rather than of horizons. Only precision observations of the late-time ringdown signal, where the differences in the quasinormal-mode spectrum eventually show up, can be used to rule out exotic alternatives to black holes and to test quantum effects at the horizon scale.
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