Systematic bias away from GR due to missing physics of spin precession, eccentricity, and higher modes in gravitational waveforms

Theory-agnostic tests of general relativity (GR) are possible due to the development of gravitational waveforms with parameterized deviations, such as in the post-Einsteinian (ppE) framework. Most implementations of the theory-agnostic tests utilize base GR waveforms (on top of which parameterized corrections are added) that exclude some form of GR physics, such as spin precession, eccentricity, and higher modes, in order to simplify the GR base model. In our work, we study systematic errors that point to a bias away from GR due to the neglect of GR physics. We inject synthetic data using waveform models rooted in GR with either spin precession (IMRPhenomPv3), eccentricity (TaylorF2e), or higher modes (IMRPhenomXHM), and perform parameter estimation using a quasi-circular, non-precessing, fundamental mode waveform model IMRPhenomD with a single non-GR ppE parameter in our recovery model. We determine the bias away from GR for different injected waveforms. In this talk, I will highlight our results which indicate the importance of developing parameterized waveforms that include effects of spin, eccentricity, and higher modes