Cone theorem for generalized log canonical pairs

Let (X,B+M)(X,B+M) be a generalized log canonical pair. The cone of curves is denoted by NE(X)\overline{\operatorname{NE}}(X), and NE(X)(KX+B+M)0\overline{\operatorname{NE}}(X)_{(K_X+B+M)\geq 0} is its part on which KX+B+MK_X+B+M is nonnegative.

Cone theorem for g-lc pairs. There are countably many curves CjXC_j\subset X such that 0<(KX+B+M)Cj2dimX0<-(K_X+B+M)\cdot C_j\leq 2\dim X and

NE(X)=NE(X)(KX+B+M)0+R0[Cj].\overline{\operatorname{NE}}(X)=\overline{\operatorname{NE}}(X)_{(K_X+B+M)\geq0}+\sum\mathbb{R}_{\geq0}[C_j].

Moreover, every (KX+B+M)(K_X+B+M)-negative extremal face FF has a unique contraction morphism with the stated properties, and numerically trivial line bundles on FF descend to the contraction.

This is the expected cone theorem for generalized log canonical pairs and forms part of the anticipated generalized minimal model program. Its status is not resolved in the supplied text.

Sources & referencesView supporting material

Primary source

Jingjun Han and Zhan Li, “Weak Zariski decompositions and log terminal models for generalized polarized pairs”, arXiv:1806.01234 (2019).

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