Measure equivalence rigidity of the mapping class group

Details Measure equivalence rigidity of the mapping class group Measure equivalence rigidity of the mapping class group

2006-07-24

arxiv.org/abs/math/0607600v1

Ann.of Math.(2) 171 (2010) 1851-1901

Mathematics

Group Theory

39 pages

Scientific paper

10.4007/annals.2010.171.1851

We show that the mapping class group of a compact orientable surface with higher complexity has the following extreme rigidity in the sense of measure equivalence: if the mapping class group is measure equivalent to a discrete group, then they are commensurable up to finite kernel. Moreover, we describe all lattice embeddings of the mapping class group into a locally compact second countable group. We also obtain similar results for finite direct products of mapping class groups.

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