The log canonical adjunction, effective log abundance, and effective adjunction conjectures
The log canonical adjunction, effective log abundance, and effective adjunction conjectures
Let be the fibre space and let , , , and be as in the paper's adjunction construction. Assume that and are -divisors, is -linearly trivial over , and is klt for every , where is the generic fibre. In particular, and are -divisors. Adjunction conjectures. The following assertions are expected: is b-semiample; if is the generic fibre of , then for an integer depending only on and the multiplicities of ; and is effectively b-semiample, meaning that there is a positive integer , depending only on the dimension of and the horizontal multiplicities of , such that is very b-semiample, namely for a base-point-free divisor on some model . These assertions concern the expected positivity and effective control of the moduli part in canonical bundle adjunction; the cited theorem preceding them establishes only b-nefness under different klt hypotheses, so the conjectural semiampleness and effective bounds remain open in the supplied text.
Sources & referencesView supporting material
Primary source
Yu. G. Prokhorov and V. V. Shokurov, “Toward the second main theorem on complements: from local to global”, arXiv:math/0606242 (2007).
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