Is the Gravitational-Wave Ringdown a Probe of the Event Horizon?

@article{Cardoso2016IsTG,
  title={Is the Gravitational-Wave Ringdown a Probe of the Event Horizon?},
  author={V. Cardoso and E. Franzin and P. Pani},
  journal={Physical review letters},
  year={2016},
  volume={116 17},
  pages={
          171101
        }
}
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… Expand
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