H-minimal graphs of low regularity in the Heisenberg group

Details H-minimal graphs of low regularity in the Heisenberg group H-minimal graphs of low regularity in the Heisenberg group

2005-05-13

arxiv.org/abs/math/0505287v3

Comm. Math. Helv. 81 (2006) 337-384

Mathematics

Differential Geometry

48 pages, 7 figures

Scientific paper

In this paper we investigate H-minimal graphs of lower regularity. We show that noncharactersitic C^1 H-minimal graphs whose components of the unit horizontal Gauss map are in W^{1,1} are ruled surfaces with C^2 seed curves. In a different direction, we investigate ways in which patches of C^1 H-minimal graphs can be glued together to form continuous piecewise C^1 H-minimal surfaces. We apply these description of H-minimal graphs to the question of the existence of smooth solutions to the Dirichlet problem with smooth data. We find a necessary condition for the existence of smooth solutions and produce examples where the conditions are satisfied and where they fail. In particular we illustrate the failure of the smoothness of the data to force smoothness of the solution to the Dirichlet problem by producing a class of smooth curves whoses H-minimal spanning graphs cannot be C^2.

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