Effective characterization of semi-abelian varieties
Let be an integer. For a smooth complex variety of dimension , let denote its logarithmic irregularity, let denote its -th logarithmic plurigenus, and let be its Albanese morphism to the universal semi-abelian variety.
Effective semi-abelian characterization conjecture. There exists an integer such that, whenever
then is an isomorphism away from a closed subset of of codimension at least .
This conjecture seeks an effective quasi-projective analogue of the Chen–Hacon characterization of varieties birational to abelian varieties, replacing projective irregularity and plurigenera by logarithmic invariants and describing the resulting semi-abelian Albanese morphism in codimension one. The supplied source gives no evidence of resolution.
References
Primary source
Jefferson Baudin and Sofia Tirabassi, “Effective characterization of semi-abelian varieties”, arXiv:2607.20296 (2026).
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