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Holomorphic representation of constant mean curvature surfaces in Minkowski space: consequences of non-compactness in loop group methods. (English) Zbl 1208.53065

From the authors’ abstract: We give an infinite dimensional generalized Weierstrass representation for space-like constant mean curvature (CMC) surfaces in Minkowski 3-space \(\mathbb R^{2,1}\). The formulation is analogous to that given by Dorfmeister, Pedit and Wu for CMC surfaces in Euclidean space, replacing the group \(SU_{2}\) with \(SU_{1,1}\). The non-compactness of the latter group, however, means that the Iwasawa decomposition of the loop group, used to construct the surfaces, is not global. We prove that it is defined on an open dense subset, after doubling the size of the real form \(SU_{1,1}\), and prove several results concerning the behavior of the surface as the boundary of this open set is encountered. We then use the generalized Weierstrass representation to create and classify new examples of spacelike CMC surfaces in \(\mathbb R^{2,1}\). In particular, we classify surfaces of revolution and surfaces with screw motion symmetry, as well as studying another class of surfaces for which the metric is rotationally invariant.

MSC:

53C42 Differential geometry of immersions (minimal, prescribed curvature, tight, etc.)
14E20 Coverings in algebraic geometry
53A10 Minimal surfaces in differential geometry, surfaces with prescribed mean curvature
53A35 Non-Euclidean differential geometry

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