Monotone invariant conjecture for non-virtually-trivial circle bundles

For each dimension nn, let InI_n assign a numerical invariant to homotopy nn-manifolds. The invariant is required to satisfy, for every map f ⁣:MNf\colon M\longrightarrow N, the degree inequality

In(M)deg(f)In(N).I_n(M)\geq |\deg(f)|\cdot I_n(N).

Monotone invariant conjecture. In every dimension nn, there is such a homotopy nn-manifold numerical invariant InI_n that is positive and finite on every circle bundle over a closed aspherical manifold with hyperbolic fundamental group that is not virtually trivial.

The conjecture is motivated by the domination semi-norm and the Seifert volume, which provide monotone invariants in related settings. The source presents this as a suggestion, and no resolution is given.

Sources & referencesView supporting material

Primary source

Christoforos Neofytidis, “On a problem of Hopf for circle bundles over aspherical manifolds with hyperbolic fundamental groups”, arXiv:1712.03582 (2022).

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