Kwasik--Schultz manifolds are $\mathcal{Z}$-compactifiable

Abstract

Kwasik and Schultz constructed two-ended open $4$-manifolds which satisfy the usual finiteness and stability conditions at infinity but do not admit arbitrarily small $1$-neighborhoods. In particular, neither end is collarable, so the manifolds are not completable. We show that the open manifolds associated to their non-desuspendable $C_2$-actions nevertheless admit finite-dimensional compact ANR $\mathcal{Z}$-compactifications. Consequently, there exists a $\mathcal{Z}$-compactifiable open $4$-manifold which is not pseudo-collarable. This answers a question of Guilbault and Tinsley.

arXiv comment22 pages, no figures