Generalized log nonvanishing and abundance conjecture for movable divisor cones

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Let (X,Δ)(X,\Delta) be a projective klt pair of dimension nn, and fix an integer kk with 0≤k≤n−10\leq k\leq n-1. Let Mov⁡k(X)\operatorname{Mov}^k(X) be the cone generated by numerical classes of effective Cartier divisors whose stable base locus has codimension at least k+1k+1, and let Mov⁡‾k(X)\overline{\operatorname{Mov}}^k(X) be its closure in N1(X)RN^1(X)_\mathbb{R}. Generalized log nonvanishing and abundance conjecture. If

KX+Δ∈Mov⁡‾k(X),K_X+\Delta\in\overline{\operatorname{Mov}}^k(X),

then

KX+Δ∈Mov⁡k(X).K_X+\Delta\in\operatorname{Mov}^k(X).

This simultaneously generalizes the log nonvanishing and log abundance conjectures, corresponding to k=0k=0 and k=n−1k=n-1, respectively. The source does not state a resolution status for this generalized conjecture.

References

Primary source

Gilberto Bini, Maria Chiara Brambilla, Claudio Fontanari and Elisa Postinghel, “Nonvanishing and Abundance for cones of movable divisors”, arXiv:2405.14553 (2024).

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