Einstein equations in the null quasi-spherical gauge III: numerical algorithms

Details Einstein equations in the null quasi-spherical gauge III: numerical algorithms Einstein equations in the null quasi-spherical gauge III: numerical algorithms

1999-04-19

arxiv.org/abs/gr-qc/9904045v1

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

Latex, 38 pages, 29 figures (360Kb compressed)

Scientific paper

We describe numerical techniques used in the construction of our 4th order evolution for the full Einstein equations, and assess the accuracy of representative solutions. The code is based on a null gauge with a quasi-spherical radial coordinate, and simulates the interaction of a single black hole with gravitational radiation. Techniques used include spherical harmonic representations, convolution spline interpolation and filtering, and an RK4 "method of lines" evolution. For sample initial data of "intermediate" size (gravitational field with 19% of the black hole mass), the code is accurate to 1 part in 10^5, until null time z=55 when the coordinate condition breaks down.

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