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On gravitational-wave echoes from neutron-star binary coalescences

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arxiv 1804.01444 v3 pith:T7TPHME6 submitted 2018-04-04 gr-qc astro-ph.HEhep-ph

Paolo Pani , Valeria Ferrari This is my paper · ORCID
classification gr-qcastro-ph.HEhep-ph
keywords echoesgravitational-wavestarbeenneutronneutron-starobjectradius
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abstract

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). If confirmed, low-frequency gravitational-wave echoes would be in tension with all current neutron-star models and would have dramatic implications for nuclear physics and gravity.

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Gravitational wave echoes as probes of the maximum mass of strange stars in quadratic curvature-matter coupled gravity

    gr-qc 2026-07 reject novelty 5.0 of 10

    In f(R+αR²,T) gravity with tuned parameters, MIT-bag strange stars can exceed the compactness needed for photon spheres and would produce kHz gravitational-wave echoes.

  2. Probing the existence of a minimal length through compact binary inspiral

    gr-qc 2025-05 conditional novelty 5.0 of 10

    A minimum length in spacetime would make black holes perfectly reflective below a cutoff frequency, imprinting the inspiral waveform via modified tidal heating.

  3. Tests of General Relativity with Binary Black Holes from the second LIGO-Virgo Gravitational-Wave Transient Catalog

    gr-qc 2020-10 accept novelty 5.0 of 10

    No evidence for deviations from general relativity is found in LIGO-Virgo binary black hole events, with improved constraints on waveform parameters, graviton mass, and ringdown properties.

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