Beauville–Bogomolov decomposition conjecture for manifolds with nef anticanonical class

Let XX be a compact Kähler manifold with nef anticanonical class. Denote its universal cover by X~\widetilde{X}. Decomposition conjecture. The universal cover decomposes as a product

X~Cq×Yj×Sk×Z,\widetilde{X} \simeq \mathbb{C}^q \times \prod Y_j \times \prod S_k \times Z,

where the YjY_j are irreducible Calabi–Yau manifolds, the SkS_k are irreducible hyperkähler manifolds, and ZZ is a rationally connected manifold. This is an analogue of the Beauville–Bogomolov decomposition theorem. The conjecture has been proved under the stronger assumptions that TXT_X is nef, KX-K_X is hermitian semipositive, or the general fibre of the Albanese map is weak Fano.

Sources & referencesView supporting material

Primary source

Junyan Cao and Andreas Höring, “A decomposition theorem for projective manifolds with nef anticanonical bundle”, arXiv:1706.08814 (2017).

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