Detection and analysis or gravitational wave signals rely on fast and accurate theoretical models. In particular, the effective-one-body (EOB) framework proved very fruitful in bridging the gap between analytical (approximated) solutions of Einstein’s equations and numerical relativity (NR) information.
The improved sensitivity of interferometers will allow for detection of different gravitational wave signatures, such as waves generated by eccentric and scattering binary systems. Analytical advances in post-Minkowskian (PM) computations, borrowing quantum-field theory techniques, provide us new tools to approach the modelization of such systems.
We will present recent developments both in NR simulations of black hole scatterings and analytical PM computations. We will also show how resummations through the EOB approach are crucial in improving the agreement of PM series with numerical results.