Eventually outer boundary will be matched to an exterior evolution code that evolves the geometry along outgoing characteristics
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Code will extract radiation waveforms
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Evolve data out to "future null infinity"
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Null code exists and can evolve black hole spacetimes "forever" or 60,000M. However stabily matching the two codes is a problem and once that is resolved we can utilize that module as an outer boundary condition on our Cauchy evolution.
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