Rigidity of Schottky sets

Details Rigidity of Schottky sets Rigidity of Schottky sets

2011-02-22

arxiv.org/abs/1102.4381v1

Mathematics

Metric Geometry

37 pages. To appear in the American Journal of Mathematics

Scientific paper

We call a complement of a union of at least three disjoint (round) open balls in the unit sphere S^n a Schottky set. We prove that every quasisymmetric homeomorphism of a Schottky set of spherical measure zero to another Schottky set is the restriction of a Mobius transformation on S^n. In the other direction we show that every Schottky set in S^2 of positive measure admits non-trivial quasisymmetric maps to other Schottky sets. These results are applied to establish rigidity statements for convex subsets of hyperbolic space that have totally geodesic boundaries.

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