Integrable measure equivalence and rigidity of hyperbolic lattices |
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Authors: | Uri Bader Alex Furman Roman Sauer |
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Institution: | 1. Mathematics Department, Technion—Israel Institute of Technology, Haifa, 32000, Israel 2. Mathematics, Statistics and Computer Science, University of Illinois at Chicago, Chicago, IL, 60607-7045, USA 3. Department of Mathematics, University of Chicago, Chicago, IL, 60637, USA 4. Department of Mathematics, Institute for Algebra and Geometry, Karlsruhe Institute of Technology, 76133, Karlsruhe, Germany
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Abstract: | We study rigidity properties of lattices in $\operatorname {Isom}(\mathbf {H}^{n})\simeq \mathrm {SO}_{n,1}({\mathbb{R}})$ , n≥3, and of surface groups in $\operatorname {Isom}(\mathbf {H}^{2})\simeq \mathrm {SL}_{2}({\mathbb{R}})$ in the context of integrable measure equivalence. The results for lattices in $\operatorname {Isom}(\mathbf {H}^{n})$ , n≥3, are generalizations of Mostow rigidity; they include a cocycle version of strong rigidity and an integrable measure equivalence classification. Despite the lack of Mostow rigidity for n=2 we show that cocompact lattices in $\operatorname {Isom}(\mathbf {H}^{2})$ allow a similar integrable measure equivalence classification. |
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