The collision of boosted black holes
  We study the radiation from a collision of black holes with equal and opposite linear momenta. Results are presented from a full numerical relativity treatment and are compared with the results from a ``close-slow'' approximation. The agreement is remarkable, and suggests several insights about the generation of gravitational radiation in black hole collisions. 
John Baker, Andrew Abrahams, Peter Anninos, Steve Brandt, Richard   Price, Jorge Pullin, Edward Seidel