Papers › Homological representations of low genus mapping class groups

Homological representations of low genus mapping class groups

6 Mar 2023arXiv:2303.03552links table onlyarchive 2025-07-28

Trent Lucas

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Given a finite group G acting on a surface S, the centralizer of G in the mapping class group Mod(S) has a natural representation given by its action on the homology H₁(S; ℚ). We consider the question of whether this representation has arithmetic image. Several authors have given positive and negative answers to this question. We give a complete answer when S has genus at most 3.

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