Extensions of Inspiral and Merger Waveforms for Modified Gravity Theories

Binary black hole mergers are prime candidates when looking for deviations from GR in the strong-field regime. The parameterized post-Einsteinian (ppE) framework produces waveforms that account for leading PN order deviations predicted by a beyond-GR theory from GR waveforms. Previous work extended the ppE framework into the merger and ringdown regimes where beyond-GR corrections may also be expected. We explore how more recently developed waveform approximants inform further extensions one might make to the ppE framework.