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arXiv 0911.4124math.DGmath.CVmath.GT
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极大曲面与泛Teichmüller空间

Maximal surfaces and the universal Teichmüller space

Francesco Bonsante, Jean-Marc Schlenker

摘要:

我们证明了泛Teichmüller空间的任何元素都是由从双曲平面到其自身的唯一极小拉格朗日同态实现的。证明使用了三维反德西特空间中的极大曲面。证明了在$AdS^{n+1}$中,无穷远边界的任何子集$E$都是类空超曲面的无穷远边界,从而有界于极大类空超曲面.在$AdS^3$中,如果$E$是一个拟对称同胚的图,则这个极大曲面是唯一的,并且它有负的截面曲率。作为一个副产品,我们发现一个简单的表征拟对称同胚的圆的三维射影几何。

英文摘要:

We show that any element of the universal Teichmüller space is realized by a unique minimal Lagrangian diffeomorphism from the hyperbolic plane to itself. The proof uses maximal surfaces in the 3-dimensional anti-de Sitter space. We show that, in $AdS^{n+1}$, any subset $E$ of the boundary at infinity which is the boundary at infinity of a space-like hypersurface bounds a maximal space-like hypersurface. In $AdS^3$, if $E$ is the graph of a quasi-symmetric homeomorphism, then this maximal surface is unique, and it has negative sectional curvature. As a by-product, we find a simple characterization of quasi-symmetric homeomorphisms of the circle in terms of 3-dimensional projective geometry.

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