The Type (1) face orbit conjecture for K3-fibered threefolds

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Let YY be a smooth projective 33-fold and let f:Y→P1f:Y\to\mathbb{P}^{1} be a K3 fibration such that −KY=f∗O(1)-K_Y=f^*\mathcal{O}(1). Let Mov⁡e(Y)\operatorname{Mov}^{e}(Y) denote the effective movable cone, and let Type (1) faces be the faces associated with the blowup of a smooth curve of genus gg.

Type (1) face orbit conjecture. The pseudoautomorphism group PsAut⁡(Y)\operatorname{PsAut}(Y) acts with finitely many orbits on the Type (1) faces of Mov⁡e(Y)\operatorname{Mov}^{e}(Y) for every genus g≥0g\geq 0.

This assertion concerns the finiteness of birational models arising from Type (1) extremal contractions. The supplied text gives no resolution status for this statement, so it is recorded as open.

References

Primary source

Jennifer Li, “On the cone conjecture for log Calabi-Yau mirrors of Fano 3-folds”, arXiv:2310.02962 (2023).

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