Abstract
In this article we associate to G, a truncated p-divisible \({{\mathcal {O}}}\)-module of given signature, where \({{\mathcal {O}}}\) is a finite unramified extension of \(\mathbb {Z}_p\), a filtration of G by sub-\({{\mathcal {O}}}\)-modules under the condition that its Hasse \(\mu \)-invariant is smaller than an explicit bound. This filtration generalise the one given when G is \(\mu \)-ordinary. The construction of the filtration relies on a precise study of the crystalline periods of a p-divisible \({{\mathcal {O}}}\)-module. We then apply this result to families of such groups, in particular to strict neighbourhoods of the \(\mu \)-ordinary locus inside some PEL Shimura varieties.
Résumé
Dans cet article, à G un groupe p-divisible tronqué muni d’une action d’une extension finie non ramifiée \({{\mathcal {O}}}\) de \(\mathbb {Z}_p\), et de signature donnée, on associe sous une condition explicite sur son \(\mu \)-invariant de Hasse, une filtration de G par des sous-\({{\mathcal {O}}}\)-modules qui étend la filtration canonique lorsque G est \(\mu \)-ordinaire. La construction se fait en étudiant les périodes cristallines des groupes p-divisibles avec action de \({{\mathcal {O}}}\). On applique ensuite cela aux familles de tels groupes, en particulier des voisinages stricts du lieu \(\mu \)-ordinaire dans des variétés de Shimura PEL.
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Appendice A. Quelques calculs
Appendice A. Quelques calculs
Lemme A.1
Soit p un nombre premier, et \(n,f \in \mathbb {N}^*\). Alors on a l’égalité,
Démonstration
Cela revient à l’équation,
donc,
c’est à dire,
mais comme \(2p^f \geqslant 3f+1\), on a bien la majoration voulue.
Proposition A.2
(Bijakowski [6] proposition 1.25) Soit \(D,C \subset G[p^n]\) deux sous-\({{\mathcal {O}}}\)-modules de \({{\mathcal {O}}}\)-hauteurs respectives \(d \leqslant c\). Supposons que
alors \(D \subset C\).
Démonstration
Notons \(h = {{\,\mathrm{ht}\,}}_{{\mathcal {O}}}(D\cap C)\). La \({{\mathcal {O}}}\)-hauteur de \(D+C\) est alors \(d + c - h \geqslant h\). On a alors,
On peut alors écrire,
où \(A = \{ \tau ' : np_{\tau '}< h\}, B = \{ \tau ' : h \leqslant np_{\tau '} < d + c - h\},\) et \(C = \{ \tau ' : np_{\tau '} \geqslant d + c - h\}\). Mais si \(D \not \subset C\), alors \(h \leqslant d - 1\), et on en déduit donc,
Ce qui contredit l’hypothèse de l’énoncé. \(\square \)
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Hernandez, V. La filtration canonique des \({{\mathcal {O}}}\)-modules p-divisibles. Math. Ann. 375, 17–92 (2019). https://doi.org/10.1007/s00208-018-1789-2
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DOI: https://doi.org/10.1007/s00208-018-1789-2