Well-posedness of the scale-invariant tetrad formulation of the vacuum Einstein equations

Abstract

We show that with a small modification, the formulation of the Einstein equations of Uggla et al, which uses tetrad variables normalised by the expansion, is a mixed symmetric hyperbolic/parabolic system. Well-posedness of the Cauchy problem follows from a standard theorem.

Added section on the well-posedness of the constraint evolution system