Homology of the curve complex and the Steinberg module of the mapping class group

Details Homology of the curve complex and the Steinberg module of the mapping class group Homology of the curve complex and the Steinberg module of the mapping class group

2007-10-31

arxiv.org/abs/0711.0011v3

Mathematics

Geometric Topology

23 pages, 11 figures, minor corrections

Scientific paper

By the work of Harer, the reduced homology of the complex of curves is a fundamental cohomological object associated to all torsion free finite index subgroups of the mapping class group. We call this homology group the Steinberg module of the mapping class group. It was previously known that the curve complex has the homotopy type of a bouquet of spheres. Here, we give the first explicit homologically nontrivial sphere in the curve complex and show that under the action of the mapping class group, the orbit of this homology class generates the reduced homology of the curve complex.

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