The vanishing criterion for non-pseudo-effectivity of the canonical divisor

Let XX be a klt projective variety over \C\C. Suppose that

Hi(X,L)=0H^i(X,L)=0

for i>0i>0 and every semi-ample line bundle LL on XX. The vanishing criterion conjecture asserts that KXK_X is not pseudo-effective.

If true, this would provide a cohomological criterion forcing a klt projective variety outside the pseudo-effective range for the canonical divisor, with consequences for the birational geometry used in the paper's rational-chain-connectedness results. The source says that the conjecture would allow the non-vanishing assumption in one of its main results to be dropped; no resolution is given.

Sources & referencesView supporting material

Primary source

Emre Alp Özavcı, Zsolt Patakfalvi, Kevin Tucker, Joe Waldron and Zheng Xu, “On rational chain connectedness of globally +-regular varieties”, arXiv:2602.16945 (2026).

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