Gravitational-wave (GW) data can be used to test general relativity in the highly nonlinear and strong field regime. Modified gravity theories such as Einstein-dilation-Gauss-Bonnet and dynamical Chern-Simons can be tested with the additional GW signals detected in the first half of the third observing run of Advanced LIGO/Virgo. Specifically, we analyze gravitational-wave data of GW190412 and GW190814 to place constraints on the parameters of these two theories. Our results indicate that dynamical Chern-Simons gravity remains unconstrained. For Einstein-dilation-Gauss-Bonnet gravity, we find αEdGB≲0.40km when considering GW190814 data, assuming it is a black hole binary. Such a constraint is improved by a factor of approximately 10 in comparison to that set by the first Gravitational-Wave Transient Catalog events.
@article{arxiv.2104.07590,
title = {Tight constraints on Einstein-dilation-Gauss-Bonnet gravity from GW190412 and GW190814},
author = {Hai-Tian Wang and Shao-Peng Tang and Peng-Cheng Li and Ming-Zhe Han and Yi-Zhong Fan},
journal= {arXiv preprint arXiv:2104.07590},
year = {2021}
}