For spacelike stationary (i.e. zero mean curvature) surfaces in 4-dimensional Lorentz space one can naturally introduce two Gauss maps and Weierstrass representation. In this paper we investigate their global geometry systematically. The total Gaussian curvature is related with the surface topology as well as the indices of the so-called good singular ends by a generalized Jorge-Meeks formula. On the other hand, as shown by a family of counter-examples to Osserman's theorem, finite total curvature no longer implies that Gauss maps extend to the ends. Interesting examples include the generalization of the classical catenoids, helicoids, the Enneper surface, and Jorge-Meeks' k-noids. Any of them could be embedded in the 4-dimensional Lorentz space, showing a sharp contrast with the case of 3-dimensional Euclidean space.Comment: 36 pages. Compared to version 5, this final version has fixed several minor mistakes and improved the exposition in many places. Zhiyu Liu is still in the author list of this version. But when published on Adv. Math. his name was dropped, mainly because we could not contact with him and he can not sign the copyright agreemen
To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.