3 methods
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1. Blended Dirichlet outer boundary conditions.
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Stable evolutions can be obtained!
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Only works for limited cases with exact CC.
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2. Perturbative OB PRL 80 (1998) 1812-1815
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Easier than CCM, since perturbative calculations are not expensive, and the matching is not complex.
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Problems are that it needs to be far from the hole ~20M, and we need separate backgrounds from perturbations.
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3. Cauchy-characteristic matching (PRL 80 (1998) 3915-3918)
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Works well for simple test cases.
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