Existence of good minimal models for klt adjoint foliated structures

From papers

Let (X,F,t)(X,\mathcal{F},t) be a projective klt adjoint foliated structure, and set

K:=tKF+(1t)KX.K:=tK_{\mathcal{F}}+(1-t)K_X.

Assume that KK is pseudo-effective and t<1t<1. Existence of good minimal models. The structure (X,F,t)(X,\mathcal{F},t) has a good minimal model: there exists a KK-negative birational contraction ϕ ⁣:XXmin\phi\colon X\dashrightarrow X_{\min} such that ϕK\phi_*K is semi-ample. If KK is big, then (X,F,t)(X,\mathcal{F},t) has a canonical model: there exists a KK-non-positive birational contraction ψ ⁣:XXcan\psi\colon X\dashrightarrow X_{\operatorname{can}} such that ψK\psi_*K is ample. Moreover, XcanX_{\operatorname{can}} is unique, and if tt is rational, then

Xcan=Projm=0+H0(X,OX(m(tKF+(1t)KX))).X_{\operatorname{can}}=\operatorname{Proj}\bigoplus_{m=0}^{+\infty}H^0\left(X,\mathcal{O}_X\left(\left\lfloor m\left(tK_{\mathcal{F}}+(1-t)K_X\right)\right\rfloor\right)\right).

This is a conjectural BCHM-type statement for adjoint foliated structures, strengthening the theorem discussed immediately beforehand. It predicts existence of good minimal models in the pseudo-effective case and canonical models in the big case, including uniqueness and the stated Proj description for rational tt.

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Primary source

Paolo Cascini, Jingjun Han, Jihao Liu, Fanjun Meng, Calum Spicer, Roberto Svaldi and Lingyao Xie, “On finite generation and boundedness of adjoint foliated structures”, arXiv:2504.10737 (2025).

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