Generalised abundance conjecture for klt pairs with nef adjoint divisors

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Let (X,B)(X,B) be a projective klt pair over a field kk. Assume that KX+BK_X+B is pseudo-effective, and let MM be a nef Q\mathbb{Q}-Cartier Q\mathbb{Q}-divisor on XX. A divisor is num-semiample if it is numerically equivalent to a semiample Q\mathbb{Q}-Cartier Q\mathbb{Q}-divisor.

Generalised abundance conjecture. If KX+B+MK_X+B+M is nef, then KX+B+MK_X+B+M is num-semiample.

This extends abundance and the semiampleness conjecture to adjoint divisors involving a nef summand. The supplied text gives no resolution of the general statement, so it remains open.

References

Primary source

Fabio Bernasconi and Liam Stigant, “Semiampleness for Calabi–Yau surfaces in positive and mixed characteristic”, arXiv:2207.03002 (2022).

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