Generalized log minimal model and termination conjecture for lc pairs

Let (X/Z,B+A)(X/Z,B+A) be a log canonical pair, where B,A0B,A\ge 0 are Q\mathbb Q-divisors, AA is Q\mathbb Q-Cartier, and the morphism f ⁣:XZf\colon X\to Z is surjective. Assume

KX+B+AQ0/Z.K_X+B+A\sim_{\mathbb Q}0/Z.

Generalized log minimal model conjecture. The pair (X/Z,B)(X/Z,B) has either a Mori fibre space or a log minimal model (Y/Z,BY)(Y/Z,B_Y); if KY+BYK_Y+B_Y is nef/Z/Z, then it is semi-ample/Z/Z; and if (X/Z,B)(X/Z,B) is Q\mathbb Q-factorial dlt, then every LMMP/Z/Z on KX+BK_X+B with scaling of an ample/Z/Z Q\mathbb Q-divisor terminates.

This statement is a general form of conjectures related to singularities and is motivated by the existence of log flips for log canonical pairs. The paper proves that it follows from either the semi-ampleness conjecture recorded separately below or the ACC conjecture on log canonical thresholds.

Sources & referencesView supporting material

Primary source

Caucher Birkar, “Existence of log canonical flips and a special LMMP”, arXiv:1104.4981 (2012).

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