English

Branched coverings of simply connected $4$-manifolds

Geometric Topology 2026-05-27 v1

Abstract

We show that, given d4d \geq 4 and two closed connected oriented PL 44-manifolds MM and NN such that NN has a handle decomposition with no 11- and 33-handles, there exists a dd-fold simple branched covering p ⁣:M\darrowdNp \colon M \darrow{d} N if and only if there is an isometric embedding of intersection lattices dINIMd \cdot I_N \hookrightarrow I_M. Moreover, if such pp exists, one can build it in such a way that its branch set BpNB_p \subset N is locally flat PL embedded if d5d \geq 5 and has at most nodal singularities if d=4d=4.

Keywords

Cite

@article{arxiv.2605.26337,
  title  = {Branched coverings of simply connected $4$-manifolds},
  author = {Valentina Bais and Riccardo Piergallini and Daniele Zuddas},
  journal= {arXiv preprint arXiv:2605.26337},
  year   = {2026}
}