Séminaires : Séminaire Groupes Réductifs et Formes Automorphes

Equipe(s) : fa, tn,
Responsables :Alexis Bouthier, Francesco Lemma
Email des responsables : alexis.bouthier@imj-prg.fr, francesco.lemma(at)imj-prg.fr
Salle :
Adresse :

Orateur(s) Urs HARTL - Université de Fribourg,
Titre On Period Spaces for $p$-divisible Groups
Horaire14:00 à 15:00
RésumeFix a $p$-divisible group over an algebraically closed field of characteristic $p$ and consider its deformations to characteristic zero. In 1970 Grothendieck posed the question to determine the set of all Hodge filtrations which can occur as the Hodge filtration of such a deformation. It is a subset of a Grassmannian. As a first step Rapoport and Zink constructed in their book a rigid-analytic period space $F_{wa}$ inside this Grassmannian which contains all these Hodge filtrations. In my talk I show that however, almost always $F_{wa}$ contains Berkovich points which do not correspond to Hodge filtrations, and I construct a Berkovich open subspace $F_a$ of $F_{wa}$ which I conjecture to be the answer to Grothendieck's question. (Preprint on arXiv:math.NT/0605254 )