%0 Journal Article %T Gravitational wave extraction and outer boundary conditions by perturbative matching %A The Binary Black Hole Grand Challenge Alliance %A : %A A. M. Abrahams %A L. Rezzolla %A M. E. Rupright %A A. Anderson %A P. Anninos %A T. W. Baumgarte %A N. T. Bishop %A S. R. Brandt %A J. C. Browne %A K. Camarda %A M. W. Choptuik %A G. B. Cook %A C. R. Evans %A L. S. Finn %A G. Fox %A R. Gomez %A T. Haupt %A M. F. Huq %A L. E. Kidder %A S. Klasky %A P. Laguna %A W. Landry %A L. Lehner %A J. Lenaghan %A R. L. Marsa %A J. Masso %A R. A. Matzner %A S. Mitra %A P. Papadopoulos %A M. Parashar %A F. Saied %A P. E. Saylor %A M. A. Scheel %A E. Seidel %A S. L. Shapiro %A D. Shoemaker %A L. Smarr %A B. Szilagyi %A S. A. Teukolsky %A M. H. P. M. van Putten %A P. Walker %A J. Winicour %A J. W. York Jr %J Physics %D 1997 %I arXiv %R 10.1103/PhysRevLett.80.1812 %X We present a method for extracting gravitational radiation from a three-dimensional numerical relativity simulation and, using the extracted data, to provide outer boundary conditions. The method treats dynamical gravitational variables as nonspherical perturbations of Schwarzschild geometry. We discuss a code which implements this method and present results of tests which have been performed with a three dimensional numerical relativity code. %U http://arxiv.org/abs/gr-qc/9709082v1