There is also a work from last year concerning to analytical waveforms -> https://arxiv.org/abs/1706.07704
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RT @ronaldolobato@twitter.com
An Astrophysicist Just Calculated The Insanely Complex Waveform of Two Colliding Black Holes

https://www.sciencealert.com/the-incalculable-waveform-of-two-colliding-black-holes-has-now-been-calculated/amp
https://twitter.com/ronaldolobato/status/1125423697177632768