Adjunction termination implies uniruledness

Let XX be a smooth projective variety of dimension nn over \a0C\a0\mathbb{C}, with canonical divisor KXK_X, and let LL be an effective divisor. Say that adjunction terminates in the classical sense for LL if there exists an integer m01m_0\geq 1 such that

H0(X,L+mKX)=0H^0(X,L+mK_X)=0

for every integer mm0m\geq m_0. Adjunction termination conjecture. If adjunction terminates in the classical sense for LL, then XX is uniruled. The condition implies that XX has negative Kodaira dimension, and the conjecture reflects the expectation that varieties of negative Kodaira dimension are uniruled; the statement is presented as an open question.

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Primary source

Camilla Felisetti and Claudio Fontanari, “On generalized nefness and bigness in adjunction theory”, arXiv:2202.11563 (2022).

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