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Homological representations of low genus mapping class groups
Published 6 Mar 2023 in math.GT, math.GR, and math.RT | (2303.03552v2)
Abstract: Given a finite group $G$ acting on a surface $S$, the centralizer of G in the mapping class group $\textrm{Mod}(S)$ has a natural representation given by its action on the homology $H_1(S; \mathbb{Q})$. 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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