English

Homological representations of low genus mapping class groups

Geometric Topology 2024-03-15 v2 Group Theory Representation Theory

Abstract

Given a finite group GG acting on a surface SS, the centralizer of G in the mapping class group Mod(S)\textrm{Mod}(S) has a natural representation given by its action on the homology H1(S;Q)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.

Keywords

Cite

@article{arxiv.2303.03552,
  title  = {Homological representations of low genus mapping class groups},
  author = {Trent Lucas},
  journal= {arXiv preprint arXiv:2303.03552},
  year   = {2024}
}

Comments

31 pages, 8 figures. Minor edits, final version

R2 v1 2026-06-28T09:04:35.307Z