Geometrical Well Posed Systems for the Einstein Equations

Details Geometrical Well Posed Systems for the Einstein Equations Geometrical Well Posed Systems for the Einstein Equations

1995-06-28

arxiv.org/abs/gr-qc/9506071v1

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

13 pages, latex, no figures

Scientific paper

We show that, given an arbitrary shift, the lapse $N$ can be chosen so that the extrinsic curvature $K$ of the space slices with metric $\overline g$ in arbitrary coordinates of a solution of Einstein's equations satisfies a quasi-linear wave equation. We give a geometric first order symmetric hyperbolic system verified in vacuum by $\overline g$, $K$ and $N$. We show that one can also obtain a quasi-linear wave equation for $K$ by requiring $N$ to satisfy at each time an elliptic equation which fixes the value of the mean extrinsic curvature of the space slices.

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