The product-cover conjecture for foliations with numerically trivial tangent bundle

Let X\mathsf{X} be a compact Kähler manifold, and let F\mathcal{F} be a regular foliation of X\mathsf{X} with c1(TF)=0c_1(\mathcal{T}_{\mathcal{F}})=0.

Product-cover conjecture. There exist possibly noncompact Kähler manifolds Y\mathsf{Y} and Z\mathsf{Z}, with ωY\omega_\mathsf{Y} trivial, and a covering map

f:Y×ZXf:\mathsf{Y}\times\mathsf{Z}\to\mathsf{X}

such that f1Ff^{-1}\mathcal{F} is induced by the projection to Z\mathsf{Z}.

This formulation combines the conjectured tangent-bundle splitting with Beauville's conjecture on universal-cover products. It would describe the foliation after a possibly infinite cover, but remains open.

Sources & referencesView supporting material

Primary source

Stéphane Druel, Jorge Vitório Pereira, Brent Pym and Frédéric Touzet, “Numerically flat foliations and holomorphic Poisson geometry”, arXiv:2411.08806 (2024).

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