English

Closed hyperbolic manifolds without $\text{spin}^c$ structures

Geometric Topology 2025-03-04 v4

Abstract

In all dimensions n5n \ge 5, we prove the existence of closed orientable hyperbolic manifolds that do not admit any spinc\text{spin}^c structure, and in fact we show that there are infinitely many commensurability classes of such manifolds. These manifolds all have non-vanishing third Stiefel--Whitney class w3w_3 and are all arithmetic of simplest type. More generally, we show that for each k1k \ge 1 and n4k+1n \ge 4k+1, there exist infinitely many commensurability classes of closed orientable hyperbolic nn-manifolds MM with w4k1(M)0w_{4k-1}(M) \ne 0.

Keywords

Cite

@article{arxiv.2501.07796,
  title  = {Closed hyperbolic manifolds without $\text{spin}^c$ structures},
  author = {Jacopo G. Chen},
  journal= {arXiv preprint arXiv:2501.07796},
  year   = {2025}
}

Comments

15 pages. Fixed technical issues in Section 4, by requiring in various statements that facets of right-angled manifolds be embedded

R2 v1 2026-06-28T21:05:25.376Z