Supersingular O'Grady Varieties of Dimension Six. (8th February 2021)

• Record Type: Journal Article
• Authors: Fu, Lie; Li, Zhiyuan; Zou, Haitao
• Is Part Of: International mathematics research notices. Volume 2022:Number 11(2022)
• Page Start: 8769
• Page End: 8802
• Publication Date: 2021-02-08
• Subjects: Mathematics -- Periodicals; 510
• DOI: 10.1093/imrn/rnaa349
• Languages: English
• ISSNs: 1073-7928

Abstract

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 $p\neq 2$, called OG6 varieties. Assuming $p\geq 3$, 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.