Shokurov's effective log adjunction conjecture
Shokurov's effective log adjunction conjecture
Let be a log klt pair and let be a surjective morphism such that the Kodaira dimension of restricted to the general fibre is zero. Assume
where is the discriminant divisor and is the moduli divisor. Shokurov's effective log adjunction conjecture. (1) There exists a birational contraction such that, after base change, the induced moduli divisor on is semiample. (2) If is the generic fibre of , then
where depends only on and the horizontal multiplicities of . (3) There exists a positive integer depending only on the dimension of and the horizontal multiplicities of such that is base point free on some model . These assertions concern semiampleness and effective bounds for the moduli part in the canonical bundle formula; the cited source does not provide evidence resolving them.
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Sources & referencesView supporting material
Primary source
Gueorgui Todorov, “Effective log Iitaka fibrations for surfaces and threefolds”, arXiv:0805.3494 (2008).
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