Refined indecomposability conjecture for varieties with positive irregularity

Let XX be a smooth projective variety, let KXK_X be nef and effective, and define the irregularity by q(X)=h1(OX)q(X)=h^1(\mathcal{O}_X). Refined indecomposability conjecture. If q(X)1q(X)\geq 1, then D(X)D(X) admits no nontrivial semi-orthogonal decompositions. This refines the preceding conjecture by imposing positive irregularity, equivalently requiring dimPic0(X)1\dim \operatorname{Pic}^0(X)\geq 1; its resolution is not indicated here.

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Primary source

Xun Lin, “On nonexistence of semi-orthogonal decompositions in algebraic geometry”, arXiv:2107.09564 (2021).

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