Decomposable Iitaka fibration conjecture without the Q-factorial assumption

Let dd be a positive integer and let Γ[0,1]\Gamma\subset[0,1] be a DCC set. A (Γ0,Γ)(\Gamma_0,\Gamma')-decomposable Iitaka fibration is the decomposition notion defined for invariant Iitaka fibrations; its strong version additionally requires the relevant rounded linear systems to be birational.

Decomposable Iitaka fibration conjecture. There exist a positive integer mm, a finite set Γ0(0,1]\Gamma_0\subset(0,1], and a DCC set Γ[0,1]\Gamma'\subset[0,1], depending only on dd and Γ\Gamma, such that every lc pair (X,B)(X,B) of dimension dd with BΓB\in\Gamma, κι(X,KX+B)0\kappa_\iota(X,K_X+B)\ge0, and either finite Γ\Gamma or all components of BB Q\mathbb Q-Cartier, has both the weak and strong decomposable Iitaka fibration properties.

This is presented as a stronger variant of the earlier decomposable Iitaka fibration conjecture and remains open in the supplied context.

Sources & referencesView supporting material

Primary source

Guodu Chen, Jingjun Han and Jihao Liu, “On effective log Iitaka fibrations and existence of complements”, arXiv:2301.04813 (2023).

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