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Regularity and splitting of directed minimal cones

Oliver C. Schnuerer

math.AParXiv:math/0308204

Abstract

We show that directed minimal cones in (n+1)-dimensional Euclidean space which have at most one singularity are - besides the trivial cases: empty set, whole space - half spaces. Using blow-up techniques, this result can be used to get C1,lambda-regularity for the measure-theoretic boundary of almost minimal Caccioppoli sets which are representable as subgraphs in Rn, n<=8. This provides a different method to obtain a result due to De Giorgi. We also prove a splitting theorem for general directed minimal cones. Such a cone is the Cartesian product of Rk and C, where C is an undirected minimal cone or a half-line.

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