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Are gravitational wave ringdown echoes always equal-interval ? · Around

2018

Are gravitational wave ringdown echoes always equal-interval ?

Wang, Yu-Tong, Li, Zhi-Peng, Zhang, Jun et al.

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Gravitational wave (GW) ringdown waveforms may contain "echoes" that encode new physics in the strong gravity regime.

It is commonly assumed that the new physics gives rise to the GW echoes whose intervals are constant.
We point out that this assumption is not always applicable.
In particular, if the post-merger object is initially a wormhole, which slowly pinches off and eventually collapses into a black hole, the late-time ringdown waveform exhibit a series of echoes whose intervals are increasing with time.

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