# Gravitational $N$-body mergers?

Beyond binary systems and its mergers, have numerical relativity groups computed an approximation to $$N$$-body GW signals/waveforms or is that a hard unsolved task?

• It doesn’t seem important to do, because as far as I know mergers of more than two compact objects at a time are extremely unlikely. – G. Smith May 15 at 21:47
• To my knowledge only binary inspirals/merges and (head-on)collisions of two compact objects (see eg. arxiv.org/abs/1007.2797) have been simulated in numerical relativity (NR). As mentioned by @G.Smith the effort in terms of working and CPU hours to set a full NR simulation of a three-body does not seem worth it. Especially since the parameter space in terms of initial conditions for such an event looks huge to me. – M. J. Steil May 16 at 9:49