Construction of quasi-canonical liftings of K3 surfaces of finite height in odd characteristic

Abstract

We construct a quasi-canonical lifting of a $K3$ surface of finite height over a finite field of characteristic $p\ge 3$. Such results are previously obtained by Nygaard-Ogus when $p\ge 5$. For this purpose, we use the display-theoretic deformation theory developed by Langer, Zink, and Lau. We study the display structure of the crystalline cohomology of deformations of a $K3$ surface of finite height in terms of the Dieudonné display of the enlarged formal Brauer group.

14 pages