An explicit example is found showing how a modified theory of gravity can be constrained with the ringdown signals from merger of binary black holes. This has been made possible by the fact that the modified gravitational theory considered in this work has an exact rotating black hole solution and that the corresponding quasinormal modes can be calculated. With these, we obtain the possible constraint that can be placed on the parameter describing the deviation of this particular alternative theory from general relativity by using the detection of the ringdown signals from the binary black holes’s merger with future space-based gravitational wave detectors.

• Received 30 May 2019

DOI:https://doi.org/10.1103/PhysRevD.100.084024