Gravitational-wave echoes from numerical-relativity waveforms via spacetime construction near merging compact objects

@article{Ma2022GravitationalwaveEF,
  title={Gravitational-wave echoes from numerical-relativity waveforms via spacetime construction near merging compact objects},
  author={Sizheng Ma and Qingwen Wang and Nils Deppe and Franccois H'ebert and Lawrence E. Kidder and Jordan Moxon and William Throwe and Nils L. Vu and Mark A. Scheel and Yanbei Chen},
  journal={Physical Review D},
  year={2022}
}
We propose a new approach toward reconstructing the late-time near-horizon geometry of merging binary black holes, and toward computing gravitational-wave echoes from exotic compact objects. A binary black-hole merger spacetime can be divided by a time-like hypersurface into a Black-Hole Perturbation (BHP) region, in which the space-time geometry can be approximated by homogeneous linear perturbations of the final Kerr black hole, and a nonlinear region. At late times, the boundary between the… 

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