Numerical stability for finite difference approximations of Einstein's equations

Details Numerical stability for finite difference approximations of Einstein's equations Numerical stability for finite difference approximations of Einstein's equations

2005-03-13

arxiv.org/abs/gr-qc/0503056v2

J.Comput.Phys. 218 (2006) 607-634

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

18 pages, 9 figures

Scientific paper

10.1016/j.jcp.2006.02.027

We extend the notion of numerical stability of finite difference approximations to include hyperbolic systems that are first order in time and second order in space, such as those that appear in Numerical Relativity. By analyzing the symbol of the second order system, we obtain necessary and sufficient conditions for stability in a discrete norm containing one-sided difference operators. We prove stability for certain toy models and the linearized Nagy-Ortiz-Reula formulation of Einstein's equations. We also find that, unlike in the fully first order case, standard discretizations of some well-posed problems lead to unstable schemes and that the Courant limits are not always simply related to the characteristic speeds of the continuum problem. Finally, we propose methods for testing stability for second order in space hyperbolic systems.

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