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On the Lau group scheme
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abstract
In a 2013 article, Eike Lau constructed a canonical morphism from the stack of $n$-truncated Barsotti-Tate groups over $F_p$ to the stack of $n$-truncated displays. He also proved that this morphism is a gerbe banded by a commutative group scheme. In this paper we describe the group scheme explicitly. The stack of $n$-truncated Barsotti-Tate groups over $F_p$ has a generalization related to any pair $(G,\mu)$, where $G$ is a smooth group scheme over $Z/p^n$ and $\mu$ is a 1-bounded cocharacter of $G$. The same is true for the stack of $n$-truncated displays. We conjecture that in this more general situation the first stack is a gerbe over the second one banded by a commutative group scheme, and we give a conjectural description of this group scheme. We also give a conjectural description of the stack of $n$-truncated Barsotti-Tate groups over the formal spectrum of $Z_p$ and of its $(G,\mu)$-generalization.
Forward citations
Cited by 3 Pith papers
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Sheared displays and $p$-divisible groups
Over p-nilpotent rings, p-divisible groups are equivalent to sheared displays, resolving Drinfeld's conjecture and giving a Dieudonné theory for all p-divisible groups.
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The Shimurian BT stack is a gerbe over truncated displays
The mod p Shimurian BT stack is a gerbe over the stack of truncated displays, confirming Drinfeld's gerbe conjecture.
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Ring stacks conjecturally related to the stacks $BT_n^{G,\mu}$
This paper defines the ring stacks sRn and sR⊕n from the ring space of sheared Witt vectors and builds several explicit quasi-isomorphic models for them.
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