Gravitational radiation close to a black hole horizon: Waveform regularization and the out-going echo

  title={Gravitational radiation close to a black hole horizon: Waveform regularization and the out-going echo},
  author={Manu Srivastava and Yanbei Chen},
  journal={Physical Review D},
Black hole perturbation theory for Kerr black holes is best studied in the Newman Penrose (NP) Formalism, in which gravitational waves are described as perturbations in the Weyl scalars ψ0 and ψ4, with the governing equation being the well-known Teukolsky equation. Near infinity and near the horizon, ψ4 is dominated by the component that corresponds to waves propagating towards the positive radial direction, while ψ0 is dominated by the component that corresponds to waves that propagate towards… 

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