We compare and contrast the emission of gravitational waves and waveforms for the recently established "helicoidal-drifting-sequence" of a test particle around a Kerr black hole with the publicly available waveform templates of numerical-relativity. The merger of two black holes of comparable mass are considered. We outline a final smooth merging of the test particle into the final Kerr black hole. We find a surprising and unexpected agreement between the two treatments if we adopt, for the mass of the particle and the Kerr black hole a Newtonian-center-of-mass description, and for the Kerr black hole spin an effective value whose nature remains to be clarified.
@article{arxiv.1706.07704,
title = {Comparison and contrast of test-particle and numerical-relativity waveform templates},
author = {J. F. Rodriguez and J. A. Rueda and R. Ruffini},
journal= {arXiv preprint arXiv:1706.07704},
year = {2018}
}