Converse characterization of abelian duality spaces via the Albanese map

Let XX be an nn-dimensional smooth complex quasi-projective variety with proper Albanese map

alb:XAlb(X).\operatorname{alb}:X\to\operatorname{Alb}(X).

An abelian duality space of dimension nn is a space whose cohomology with coefficients in the group ring of its first homology is concentrated in degree nn and is nonzero there. Converse conjecture. XX is an abelian duality space of dimension nn if and only if alb\operatorname{alb} is semi-small and XX is homotopy equivalent to a finite nn-dimensional CW complex. The theorem preceding this conjecture proves that the abelian-duality property follows under the stated geometric conditions in one direction; the conjecture asserts the converse as well, but the source gives no resolution.

Sources & referencesView supporting material

Primary source

Yongqiang Liu, Laurentiu Maxim and Botong Wang, “Perverse sheaves on semi-abelian varieties”, arXiv:1804.05014 (2020).

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