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2007

Excision without excision: the relativistic turducken

Brown, David, Sarbach, Olivier, Schnetter, Erik et al.

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to turducken (turduckens, turduckening, turduckened, turduckened) [math.]: To stuff a black hole.

We analyze and apply an alternative to black hole excision based on smoothing the interior of black holes with arbitrary - possibly constraint violating - initial data, and solving the vacuum Einstein evolution equations everywhere.
By deriving the constraint propagation system for our hyperbolic formulation of the BSSN evolution system we rigorously prove that the constraints propagate causally and so any constraint violations introduced inside the black holes cannot affect the exterior spacetime.
(This does not follow from the causal structure of the spacetime as is often assumed.) We present numerical evolutions of Cook-Pfeiffer binary black hole initial configurations showing that these techniques appear to work robustly for generic data.

Excision without excision: the relativistic turducken · Around

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