New analytic representation of the ringdown waveform of coalescing spinning black hole binaries

  title={New analytic representation of the ringdown waveform of coalescing spinning black hole binaries},
  author={T. Damour and Alessandro Nagar},
  journal={Physical Review D},
We propose a new way of analyzing, and analytically representing, the ringdown part of the gravitational wave signal emitted by coalescing black hole binaries.By contrast with the usual {\it linear} decomposition of the multipolar complex waveform $h(t)$ in a sum of quasi-normal modes, our procedure relies on a {\it multiplicative} decomposition of $h(t)$ as the product of the fundamental quasi-normal mode with a remaining time-dependent complex factor whose amplitude and phase are separately… 

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