paper

Excision without excision: the relativistic turducken

arXiv:0707.3101 · doi:10.1103/PhysRevD.76.081503

Abstract

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. We also present numerical evidence from spherically symmetric evolutions that for the gauge conditions used the same stationary end-state is approached irrespective of the choice of initial data and smoothing procedure.

5 pages, 4 figures. Uses improved smoothing procedure for initial data. A free turduckening implementation is available from the authors by anonymous CVS from :pserver:[email protected]:/numrelcvs as AEIThorns/NoExcision; use the password "anon"

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