The Dirichlet problem for Monge-Ampère equations in non-convex domains and spacelike hypersurfaces of constant Gauss curvature

In this paper we extend the well known results on the existence and regularity of solutions of the Dirichlet problem for Monge-Ampere equations in a strictly convex domain to an arbitrary smooth bounded domain in R' as well as in a general Riemannian manifold. We prove for the nondegenerate case that a sufficient (and necessary) condition for the classical solvability is the existence of a subsolution. For the totally degenerate case we show that the solution is in C11(Q) if the given boundary data extends to a locally strictly convex c2 function ori Q. As an application we prove some existence results for spacelike hypersurfaces of constant Gauss-Kronecker curvature in Minkowski space spanning a prescribed boundary.

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