English

On Nielsen realization and manifold models for classifying spaces

Geometric Topology 2024-01-29 v4

Abstract

We consider the problem of whether, for a given virtually torsionfree discrete group Γ\Gamma, there exists a cocompact proper topological Γ\Gamma-manifold, which is equivariantly homotopy equivalent to the classifying space for proper actions. This problem is related to Nielsen Realization. We will make the assumption that the expected manifold model has a zero-dimensional singular set. Then we solve the problem in the case, for instance, that Γ\Gamma contains a normal torsionfree subgroup π\pi such that π\pi is hyperbolic and π\pi is the fundamental group of an aspherical closed manifold of dimension greater or equal to five and Γ/π\Gamma/\pi is a finite cyclic group of odd order.

Keywords

Cite

@article{arxiv.2303.15765,
  title  = {On Nielsen realization and manifold models for classifying spaces},
  author = {James F. Davis and Wolfgang Lueck},
  journal= {arXiv preprint arXiv:2303.15765},
  year   = {2024}
}

Comments

41 pages. The final, final version, to appear in the Transactions of the American Mathematical Society

R2 v1 2026-06-28T09:37:19.838Z