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arXiv math/9807001math.GTmath.DS
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穿孔环面群的分类

The classification of punctured-torus groups

Yair N. Minsky

摘要:

瑟斯顿的终结叠层猜想提出,一个非线性生成的克莱因群唯一地由它的商的拓扑和描述它的端点的渐近几何的不变量列表决定(直到等距)。我们给出了这个猜想的一个证明穿孔-环面群。这些是具有抛物换位子的自由双生成元克莱因群,它们应该被认为是穿孔环面的基本群的表示。由此,我们验证了穿孔环面群的变形空间的拓扑描述(包括Bers关于拟富克斯群在此空间中稠密的猜想),并证明了一个刚性定理:两个穿孔环面群是拟共形共轭的当且仅当它们是拓扑共轭的。

英文摘要:

Thurston's ending lamination conjecture proposes that a finitely generated Kleinian group is uniquely determined (up to isometry) by the topology of its quotient and a list of invariants that describe the asymptotic geometry of its ends. We present a proof of this conjecture for punctured-torus groups. These are free two-generator Kleinian groups with parabolic commutator, which should be thought of as representations of the fundamental group of a punctured torus. As a consequence we verify the conjectural topological description of the deformation space of punctured-torus groups (including Bers' conjecture that the quasi-Fuchsian groups are dense in this space) and prove a rigidity theorem: two punctured-torus groups are quasi-conformally conjugate if and only if they are topologically conjugate.

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