Abstract

The stacks of G-zips were introduced by Pink, Wedhorn and Ziegler in 2012. They play important roles in the study of Ekedahl-Oort strata and mod p automorphic forms on Shimura varieties. We will first explain properties of the G-zip stacks, and then introduce the zip-flag stacks, and discuss (as far as we can) works on mod p automorphic forms of Koskivirta-Wedhorn, Koskivirta, Goldring- Koskivirta, Goldring-Imai-Koskivirta, and Imai-Koskivirta.

Time

6.21 6.22 6.29 6.30 — 10:30-12:00