English

Homotopy classification of $4$-manifolds with $3$-manifold fundamental group

Geometric Topology 2025-08-12 v1

Abstract

We give a criterion on a group π\pi and a homomorphism w ⁣:πC2w \colon \pi \to C_2 under which closed 44-manifolds with fundamental group π\pi and orientation character ww are classified up to homotopy equivalence by their quadratic 22-types. We verify the criterion for a large class of 33-manifold groups and orientation characters, in particular for the fundamental group π\pi of any closed, orientable 33-manifold whose finite subgroups are cyclic, provided ww vanishes on every element of π\pi of finite order. We deduce a homeomorphism classification of closed, orientable 44-manifolds with infinite dihedral fundamental group Z/2Z/2\mathbb{Z}/2 * \mathbb{Z}/2.

Keywords

Cite

@article{arxiv.2508.07504,
  title  = {Homotopy classification of $4$-manifolds with $3$-manifold fundamental group},
  author = {Jonathan Hillman and Daniel Kasprowski and Mark Powell and Arunima Ray},
  journal= {arXiv preprint arXiv:2508.07504},
  year   = {2025}
}

Comments

64 pages, 2 figures