Gravity Detectives for Fundamental Physics: Probing Strong-Field Gravity with Compact Objects and Gravitational Waves*

The detections of, by now, nearly 100 gravitational wave signals originating from coalescing black hole or neutron star binaries have opened a rich discovery space for astrophysics, fundamental physics and cosmology. In particular, they enable qualitatively new tests of gravity in its most extreme, nonlinear regime. To link gravitational wave observations to extensions of general relativity, and to infer parameters of the underlying theory of gravity, we need accurate waveform models in and beyond general relativity.

In this talk, I will give an overview of recent advances in modelling compact binaries in modified theories of gravity with particular focus on numerical relativity beyond GR and I will highlight new dynamical phenomena that are absent in GR.