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On gravitational-wave echoes from neutron-star binary coalescences · Around

2018

On gravitational-wave echoes from neutron-star binary coalescences

Pani, Paolo, Ferrari, Valeria

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A tentative detection of gravitational-wave echoes in the post-merger signal of GW170817 has been recently claimed at $4.2\sigma$ significance level.

It has been speculated that the signal might provide evidence for near-horizon quantum structures in the remnant exotic object.
We point out that if the remnant object is an ultracompact neutron star, echoes are expected for objects with radius only slightly smaller than that of an ordinary neutron star.
The reported echoes at ~72 Hz are compatible with a toy model of incompressible star with mass approximately $M\in(2,3) M_\odot$ and radius close to the Buchdahl limit, R~9GM/(4c^2).

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