2020/09/30 by Lie Fu, Zhiyuan Li, Haitao Zou
Mathematics · #Abelian group #Abelian variety #Advanced Algebra and Geometry #Algebra over a field #Algebraic Geometry and Number Theory #Algebraic geometry #Cohomology #Conjecture #Dimension (graph theory) #Geometry and complex manifolds #Group cohomology #Mathematics #Moduli space #Pure mathematics #Symplectic geometry #Variety (cybernetics) #math.AG #msc:14C15 #msc:14C25 #msc:14D22 #msc:14G17 #msc:14J28 #msc:14J42 #msc:14M20 #Étale cohomology
paper · pdf · doi:10.1093/imrn/rnaa349
Final version. To appear in I.M.R.N
openalex publication_date 2020/11/10 · arxiv created 2020/11/27 · arxiv updated 2020/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Abstract O’Grady constructed a 6-dimensional irreducible holomorphic symplectic variety by taking a crepant resolution of some moduli space of stable sheaves on an abelian surface. In this paper, we naturally extend O’Grady’s construction to fields of positive characteristic p≠ 2, called OG6 varieties. Assuming p≥ 3, we show that a supersingular OG6 variety is unirational, its rational cohomology group is generated by algebraic classes, and its rational Chow motive is of Tate type. These results confirm in this case the generalized Artin–Shioda conjecture, the supersingular Tate conjecture and the supersingular Bloch conjecture proposed in our previous work, in analogy with the theory of supersingular K3 surfaces.