Thomas Baumgarte
Improved Numerical Stability of Stationary Black Hole
Evolution Calculations
We experiment with modifications of the "BSSN" form of the Einstein
field equations (a reformulation of the ADM equations) and demonstrate
how these modifications affect the stability of numerical black hole
evolution calculations. We use excision to evolve both non-rotating
and rotating Kerr-Schild black holes in octant and equatorial
symmetry, and without any symmetry assumptions, and obtain accurate
and stable simulations for specific angular momenta J/M of up to about
0.9 M.
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