Beauville–Bogomolov decomposition conjecture for manifolds with nef anticanonical class

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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.

References

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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