English

Commuting conjugates of finite-order mapping classes

Geometric Topology 2019-02-01 v1

Abstract

Let Mod(Sg)\text{Mod}(S_g) be the mapping class group of the closed orientable surface SgS_g of genus g2g\geq 2. In this paper, we derive necessary and sufficient conditions for two finite-order mapping classes to have commuting conjugates in Mod(Sg)\text{Mod}(S_g). As an application of this result, we show that any finite-order mapping class, whose corresponding orbifold is not a sphere, has a conjugate that lifts under any finite-sheeted cover of SgS_g. Furthermore, we show that any torsion element in the centralizer of an irreducible finite order mapping class is of order at most 22. We also obtain conditions for the primitivity of a finite-order mapping class. Finally, we describe a procedure for determining the explicit hyperbolic structures that realize two-generator finite abelian groups of Mod(Sg)\text{Mod}(S_g) as isometry groups.

Keywords

Cite

@article{arxiv.1901.11314,
  title  = {Commuting conjugates of finite-order mapping classes},
  author = {Neeraj K. Dhanwani and Kashyap Rajeevsarathy},
  journal= {arXiv preprint arXiv:1901.11314},
  year   = {2019}
}

Comments

24 pages, 7 figures, 1 table

R2 v1 2026-06-23T07:28:08.578Z