Symmetry-seeking spacetime coordinates

Details Symmetry-seeking spacetime coordinates Symmetry-seeking spacetime coordinates

1999-08-05

arxiv.org/abs/gr-qc/9908016v2

Class.Quant.Grav. 16 (1999) 4111-4123

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

10 pages, RevTex, to be published in CQG

Scientific paper

10.1088/0264-9381/16/12/325

In numerically constructing a spacetime that has an approximate timelike Killing vector, it is useful to choose spacetime coordinates adapted to the symmetry, so that the metric and matter variables vary only slowly with time in these coordinates. In particular, this is a crucial issue in numerically calculating a binary black hole inspiral. An approximate homothetic vector plays a role in critical gravitational collapse. We summarize old and new suggestions for finding such coordinates from a general point of view. We then test some of these in various toy models with spherical symmetry, including critical fluid collapse and critical scalar field collapse.

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