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gr-qc1999
Einstein's Equations and Equivalent Hyperbolic Dynamical Systems
Arlen Anderson, Yvonne Choquet-Bruhat, James W. York
We discuss several explicitly causal hyperbolic formulations of Einstein's dynamical 3+1 equations in a coherent way, emphasizing throughout the fundamental role of the ``slicing f…
gr-qc1999
Generalized Einstein theory with fundamental cosmological stress tensor
Arlen Anderson
Careful analysis of parametrized variational principles in mechanics and field theory leads to a generalization of Einstein theory that includes a cosmological stress tensor. This…