On reduction of Hilbert-Blumenthal varieties

Details On reduction of Hilbert-Blumenthal varieties On reduction of Hilbert-Blumenthal varieties

2002-09-11

arxiv.org/abs/math/0209114v2

Mathematics

Number Theory

A shortened revised version

Scientific paper

Let $O_F$ be the ring of integers of a totally real field $F$ of degree $g$. We study the reduction of the moduli space of separably polarized abelian $O_F$-varieties of dimension $g$ modulo $p$ for a fixed prime $p$. The invariants and related conditions for the objects in the moduli space are discussed. We construct a scheme-theoretic stratification by $a$-numbers on the Rapoport locus and study the relation with the slope stratification. In particular, we recover the main results of Goren and Oort [GO, J. Alg. Geom. 2000] on the stratifications when $p$ is unramified in $O_F$. We also prove the strong Grothendieck conjecture for the moduli space in some restricted cases, particularly when $p$ is totally ramified in $O_F$.

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