Properties of Breuil-Kisin modules inherited by $p$-divisible groups (2103.11837v3)

Abstract: In this paper, by assuming a faithful action of a finite flat $\mathbb{Z}_p$-algebra $\mathscr{R}$ on a $p$-divisible group $\mathcal{G}$ defined over the ring of $p$-adic integers $\mathscr{O}_K$, we construct a category of new Breuil-Kisin module $\mathfrak{M}$ defined over the ring $\mathfrak{S}:=W(\kappa)[![u]!]$ and study the freeness and projectiveness properties of such a module.