Gauge conditions for long-term numerical black hole evolutions without excision

Abstract

Numerical relativity has faced the problem that standard 3+1 simulations of black hole spacetimes without singularity excision and with singularity avoiding lapse and vanishing shift fail after an evolution time of around 30-40M due to the so-called slice stretching. We discuss lapse and shift conditions for the non-excision case that effectively cure slice stretching and allow run times of 1000M and more.

19 pages, 14 figures, REVTeX, Added a missing Acknowledgment

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