Sphere conjecture for coregularity-zero Fano type varieties

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Let XX be an nn-dimensional Fano type variety of coregularity zero. A 22-complement (X,B)(X,B) is a complement with (X,B)(X,B) log canonical and 2(KX+B)∼02(K_X+B)\sim 0. Let (Y,BY)(Y,B_Y) be the log pull-back of (X,B)(X,B) to a finite cover Y→XY\rightarrow X. Sphere conjecture for coregularity-zero Fano type varieties. There exists a 22-complement (X,B)(X,B) and a finite cover Y→XY\rightarrow X such that (Y,BY)(Y,B_Y) is a log Calabi–Yau pair and

D(Y,BY)≃Sn−1.\mathcal{D}(Y,B_Y)\simeq S^{n-1}.

This predicts that coregularity-zero Fano type varieties admit complements whose dual complexes become spheres after finite covers, extending the toric picture. The source presents this as an open conjecture.

References

Primary source

Joaquín Moraga, “Coregularity of Fano varieties”, arXiv:2206.10834 (2022).

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