English

Universal Realisators for Homology Classes

Algebraic Topology 2014-05-20 v2 Group Theory Metric Geometry

Abstract

We study oriented closed manifolds M^n possessing the following Universal Realisation of Cycles (URC) Property: For each topological space X and each integral homology class z of it, there exist a finite-sheeted covering \hM^n of M^n and a continuous mapping f of \hM^n to X such that f takes the fundamental class [\hM^n] to kz for a non-zero integer k. We find wide class of examples of such manifolds M^n among so-called small covers of simple polytopes. In particular, we find 4-dimensional hyperbolic manifolds possessing the URC property. As a consequence, we prove that for each 4-dimensional oriented closed manifold N^4, there exists a mapping of non-zero degree of a hyperbolic manifold M^4 to N^4. This was conjectured by Kotschick and Loeh.

Keywords

Cite

@article{arxiv.1201.4823,
  title  = {Universal Realisators for Homology Classes},
  author = {Alexander A. Gaifullin},
  journal= {arXiv preprint arXiv:1201.4823},
  year   = {2014}
}

Comments

20 pages, 1 figure; in version 2 minor corrections are made, 4 bibliography items and 1 figure are added

R2 v1 2026-06-21T20:08:37.400Z