Effective adjunction threshold conjecture for quasi polarized manifolds

Let (X,L)(X,L) be a quasi polarized manifold of dimension nn, meaning that XX is a projective manifold and LL is a nef and big Cartier divisor. Let s>0s>0. Effective adjunction threshold conjecture. One has

H0(X,KX+tL)=0H^0(X,K_X+tL)=0

for every integer tt with 1ts1\leq t\leq s if and only if KX+sLK_X+sL is not pseudo-effective. Equivalently, the first reduction (X,L)(X”,L”) is one of the pairs (X,L)(X,L) listed in the cited adjunction theorems. The paper presents the case s=n2s=n-2 as the next step after proving the corresponding result for s=n1s=n-1; the general assertion is left as a conjectural program.

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Primary source

Marco Andreatta and Claudio Fontanari, “Effective Adjunction Theory”, arXiv:1703.00758 (2018).

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