Mapping class group representations from Drinfeld doubles of finite groups
Quantum Algebra
2020-05-12 v2 High Energy Physics - Theory
Mathematical Physics
Geometric Topology
math.MP
Abstract
We investigate representations of mapping class groups of surfaces that arise from the untwisted Drinfeld double of a finite group G, focusing on surfaces without marked points or with one marked point. We obtain concrete descriptions of such representations in terms of finite group data. This allows us to establish various properties of these representations. In particular we show that they have finite images, and that for surfaces of genus at least 3 their restriction to the Torelli group is non-trivial iff G is non-abelian.
Cite
@article{arxiv.1506.03263,
title = {Mapping class group representations from Drinfeld doubles of finite groups},
author = {Jens Fjelstad and Jürgen Fuchs},
journal= {arXiv preprint arXiv:1506.03263},
year = {2020}
}
Comments
68 pages, several figures. v2: 60 pages; removed a few examples and rearranged the presentation of the remaining examples