Modeling Compact Binary Merger Waveforms Beyond General Relativity

TL;DR

This paper extends the parameterized post-Einsteinian framework to include the merger-ringdown phase of binary coalescence waveforms, introducing a new parameter related to the coalescence time to test deviations from General Relativity.

Contribution

It introduces a novel extension of the waveform model into the merger regime with a single new parameter for testing beyond-GR effects.

Findings

The extended model incorporates the merger-ringdown phase.

Parameter estimation methods for the new model are discussed.

Other merger properties remain consistent with General Relativity.

Abstract

The parameterized post-Einsteinian framework modifies inspiral waveform models to incorporate effects beyond General Relativity. We extend the existing model into the merger-ringdown regime. The modification introduced here adds a single degree of freedom that corresponds to a change in the binary coalescence time. Other merger properties remain as predicted by GR. We discuss parameter estimation with this model, and how it can be used to extract information from beyond-GR waveforms.