Аннотация:
We study oriented closed manifolds Mn
possessing the following universal realisation of cycles (URC) property: For each topological space X
and each homology class z∈Hn(X,Z), there exists a finite-sheeted covering ˆMn→Mn
and a continuous mapping f:ˆMn→X
such that f∗[ˆMn]=kz
for a non-zero integer k. We find a wide class of examples of such manifolds Mn
among so-called small covers of simple polytopes. In particular, we find 4–dimensional hyperbolic manifolds possessing the URC property. As a consequence, we obtain that for each 4–dimensional oriented closed manifold N4, there exists a mapping of non-zero degree of a hyperbolic manifold M4 to N4. This was earlier conjectured by Kotschick and Löh.
The work was partially supported by RFBR (projects 11-01-00694 and 12-01-31444), by a grant of the President of the Russian Federation (project MD-4458.2012.1), by a grant of the Government of the Russian Federation (project 2010-220-01-077), and by a grant from Dmitry Zimin's "Dynasty" foundation.
Поступила в редакцию: 07.04.2012 Принята в печать: 04.03.2013