Symmetric hyperbolic systems for Bianchi equations
arXiv:gr-qc/9805042 · doi:10.1088/0264-9381/15/7/014
Abstract
We obtain a family of first-order symmetric hyperbolic systems for the Bianchi equations. They have only physical characteristics: the light cone and timelike hypersurfaces. In the proof of the hyperbolicity, new positivity properties of the Bel tensor are used.
latex, 7 pages, accepted for publication in Class. Quantum Grav