1-Uryson width and covers
Abstract
We investigate the following question: Do there exist Riemannian polyhedra such that the 1-Uryson width of their universal covers is bounded but is arbitrarily large? We rule out two specific cases: when is virtually cyclic and when is a Riemannian surface. More specifically, we show that if is a compact polyhedron with a virtually cyclic fundamental group, then its 1-Uryson width is bounded by the 1-Uryson width of its universal cover . Precisely: We show that if is a Riemannian surface with boundary then Furthermore, we show that if there exist spaces for which is bounded while is arbitrarily large, then such examples must already appear in low dimensions. In particular, such can be found among Riemannian -complexes.
Cite
@article{arxiv.2505.21126,
title = {1-Uryson width and covers},
author = {Hannah Alpert and Arka Banerjee and Panos Papasoglu},
journal= {arXiv preprint arXiv:2505.21126},
year = {2025}
}
Comments
25 pages, 4 figures. Corrects part of Remark 2.3 and extends Theorem B to all compact surfaces with Riemannian metrics