Cohomology of configuration spaces of surfaces as mapping class group representations

Stavrou, Andreas

doi:10.1090/tran/8804

Cohomology of configuration spaces of surfaces as mapping class group representations
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by Andreas Stavrou HTML | PDF

Trans. Amer. Math. Soc. 376 (2023), 2821-2852

Abstract:

We express the rational cohomology of the unordered configuration space of a compact oriented manifold as a representation of its mapping class group in terms of a weight-decomposition of the rational cohomology of the mapping space from the manifold to a sphere. We apply this to the case of a compact oriented surface with one boundary component and explicitly compute the rational cohomology of its unordered configuration space as a representation of its mapping class group. In particular, this representation is not symplectic, but has trivial action of the second Johnson filtration subgroup of the mapping class group.

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