For a connected, reductive group $G$ over a finite field endowed with a cocharacter $μ$, we define the zip cone of $(G,μ)$ as the cone of all possible weights of mod $p$ automorphic forms on the stack of $G$-zips. This cone is conjectured to coincide with the cone of weights of characteristic $p$ automorphic forms for Hodge-type Shimura varieties of good reduction. We prove in full generality that the cone of weights of characteristic $0$ automorphic forms is contained in the zip cone, which gives further evidence to this conjecture. Furthermore, we determine exactly when the zip cone is generated by the weights of partial Hasse invariants, which is a group-theoretical generalization of a result of Diamond--Kassaei and Goldring--Koskivirta.

48 pages, appendix by Wushi Goldring

• 11F55 - Other groups and their modular and automorphic forms (several variables)
• 14D23 - Stacks and moduli problems
• 14G35 - Modular and Shimura varieties
• 20G40 - Linear algebraic groups over finite fields