Geodesic
Canonical subgroups of Barsotti-Tate groups
Yichao Tian1
1Department of Mathematics, Princeton University, Princeton NJ 08544, United States
Annals of mathematics, Tome 172 (2010) no. 2, pp. 955-988
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Let $S$ be the spectrum of a complete discrete valuation ring with fraction field of characteristic $0$ and perfect residue field of characteristic $p\geq 3$. Let $G$ be a truncated Barsotti-Tate group of level $1$ over $S$. If “$G$ is not too supersingular”, a condition that will be explicitly expressed in terms of the valuation of a certain determinant, then we prove that we can canonically lift the kernel of the Frobenius endomorphism of its special fiber to a subgroup scheme of $G$, finite and flat over $S$. We call it the canonical subgroup of $G$.

DOI : 10.4007/annals.2010.172.955

Yichao Tian  1

1 Department of Mathematics, Princeton University, Princeton NJ 08544, United States 
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Yichao Tian. Canonical subgroups of Barsotti-Tate groups. Annals of mathematics, Tome 172 (2010) no. 2, pp. 955-988. doi: 10.4007/annals.2010.172.955

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