Geometrically motivated hyperbolic coordinate conditions for numerical relativity: Analysis, issues and implementations

Details Geometrically motivated hyperbolic coordinate conditions for numerical relativity: Analysis, issues and implementations Geometrically motivated hyperbolic coordinate conditions for numerical relativity: Analysis, issues and implementations

2005-09-22

arxiv.org/abs/gr-qc/0509092v1

Phys.Rev.D72:104009,2005

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

9 figures

Scientific paper

10.1103/PhysRevD.72.104009

We study the implications of adopting hyperbolic driver coordinate conditions motivated by geometrical considerations. In particular, conditions that minimize the rate of change of the metric variables. We analyze the properties of the resulting system of equations and their effect when implementing excision techniques. We find that commonly used coordinate conditions lead to a characteristic structure at the excision surface where some modes are not of outflow-type with respect to any excision boundary chosen inside the horizon. Thus, boundary conditions are required for these modes. Unfortunately, the specification of these conditions is a delicate issue as the outflow modes involve both gauge and main variables. As an alternative to these driver equations, we examine conditions derived from extremizing a scalar constructed from Killing's equation and present specific numerical examples.

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