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On Hodge structures of quasitoric orbifolds. (English) Zbl 1367.57016

Quasitoric orbifolds are generalizations of smooth projective toric varieties. The class of quasitoric orbifolds contains orbifolds that are neither complex nor almost complex. In the paper under review the author provides a canonical Hodge structure for quasitoric orbifolds and defines their Hodge numbers. In particular, he is interested in the orbifold Hodge number conjecture, which states that the \((p,q)\)-th orbifold Hodge numbers of a Gorenstein (also known as \(\text{SL}\)) algebraic orbifold and its partial crepant resolution are equal. The main result of the paper says that the orbifold Hodge numbers of a quasi-\(\text{SL}\) quasitoric orbifold are preserved by crepant blowdowns and blowups, and hence also by crepant resolutions. The proof is motivated by the proof of the strong McKay correspondence in [V. V. Batyrev and D. I. Dais, Topology 35, No. 4, 901–929 (1996; Zbl 0864.14022)].

MSC:

57R18 Topology and geometry of orbifolds
58A14 Hodge theory in global analysis
55N32 Orbifold cohomology
55N10 Singular homology and cohomology theory
52B20 Lattice polytopes in convex geometry (including relations with commutative algebra and algebraic geometry)
32S35 Mixed Hodge theory of singular varieties (complex-analytic aspects)
14M25 Toric varieties, Newton polyhedra, Okounkov bodies

Citations:

Zbl 0864.14022