English

Coarse Structures on Homogeneous Spaces

Group Theory 2026-05-25 v1 General Topology Logic

Abstract

Given a closed normal subgroup HH of a topological group GG, we address the question of whether the left coarse structure on the quotient group G/HG/H equals the quotient of the left coarse structure on GG. We provide a counterexample among Polish groups, namely, the mapping class group of the Loch Ness monster surface seen as a quotient of the mapping class group of the punctured Loch Ness monster surface, and establish both equivalent and sufficient conditions for when this holds in special settings. The latter are formulated in terms of liftings of bounded sets, existence of transversals and metrisability of the left coarse structure of GG restricted to HH.

Keywords

Cite

@article{arxiv.2605.23822,
  title  = {Coarse Structures on Homogeneous Spaces},
  author = {Carlos Pérez Estrada and Christian Rosendal},
  journal= {arXiv preprint arXiv:2605.23822},
  year   = {2026}
}