Effective adjunction conjecture for lc-trivial fibrations

Let (X,B)(X,B) be an lc pair such that KX+BK_X+B is a QQ-Cartier divisor, and let f:(X,B)Zf:(X,B)\to Z be an lc-trivial fibration. Let D\mo{\mathbf D}_{\mo} denote its moduli b-divisor. Effective adjunction conjecture. There exists a positive integer mm, depending only on the dimension of XX and the horizontal multiplicities of BB, such that mD\mom{\mathbf D}_{\mo} is a base-point free b-divisor. This is a conjecture about effectivity in the canonical bundle formula; the paper studies a variant suitable for induction and real coefficients, while the general assertion is not stated as resolved here.

Sources & referencesView supporting material

Primary source

Zhan Li, “A variant of the effective adjunction conjecture with applications”, arXiv:2007.04107 (2020).

Additional references

2 papers in this index state this conjecture (2020). The statement above is taken from the most recent of them; the others are arXiv:2002.06565.

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