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The numerical relativity session at GR18 was dominated by physics results onbinary black hole mergers. Several groups can now simulate these from a timewhen the post-Newtonian equations of motion are still applicable, throughseveral orbits and the merger to the ringdown phase, obtaining plausiblegravitational waves at infinity, and showing some evidence of convergence withresolution. The results of different groups roughly agree. This new-wonconfidence has been used by these groups to begin mapping out the(finite-dimensional) initial data space of the problem, with a particular focuson the effect of black hole spins, and the acceleration by gravitational waverecoil to hundreds of km/s of the final merged black hole. Other work waspresented on a variety of topics, such as evolutions with matter, extreme massratio inspirals, and technical issues such as gauge choices.

Summary of GR18 Numerical Relativity parallel sessions (B1/B2 and B2), Sydney, 8-13 July 2007