Analytical model for gravitational-wave echoes from spinning remnants

@article{Maggio2019AnalyticalMF,
  title={Analytical model for gravitational-wave echoes from spinning remnants},
  author={Elisa Maggio and Adriano Testa and Swetha Bhagwat and Paolo Pani},
  journal={Physical Review D},
  year={2019}
}
Gravitational-wave echoes in the post-merger signal of a binary coalescence are predicted in various scenarios, including near-horizon quantum structures, exotic states of matter in ultracompact stars, and certain deviations from general relativity. The amplitude and frequency of each echo is modulated by the photon-sphere barrier of the remnant, which acts as a spin- and frequency-dependent high-pass filter, decreasing the frequency content of each subsequent echo. Furthermore, a major… 

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