Multimode ringdown modelling with qnmfits and KerrRingdown
Abstract
In the last decade, the ringdown community has made large strides in understanding the aftermath of binary black hole mergers through the study of numerical simulations. In this note, we introduce two flavors of fitting algorithms, that have been verified against each other, for the extraction of quasinormal mode amplitudes from ringdown waveforms - qnmfits in Python and KerrRingdown in Mathematica.
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