| HAL : hal-00004700, version 1 |
| arXiv : math.GR/0504291 |
| Fiche détaillée | Récupérer au format |
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| Annales Scientifiques de l'École Normale Supérieure. Quatrième Série 39, 6 (2006) 871-920 |
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| Group-theoretic compactification of Bruhat-Tits buildings |
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| Yves Guivarc'h 1Bertrand Rémy 2 |
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| (2006) |
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| Let GF denote the rational points of a semisimple group G over a non-archimedean local field F, with Bruhat-Tits building X. This paper contains five main results. We prove a convergence theorem for sequences of parahoric subgroups of GF in the Chabauty topology, which enables to compactify the vertices of X. We obtain a structure theorem showing that the Bruhat-Tits buildings of the Levi factors all lie in the boundary of the compactification. Then we obtain an identification theorem with the polyhedral compactification (previously defined in analogy with the case of symmetric spaces). We finally prove two parametrization theorems extending the BruhatTits dictionary between maximal compact subgroups and vertices of X: one is about Zariski connected amenable subgroups, and the other is about subgroups with distal adjoint action. |
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| 1 : | Institut de Recherche Mathématique de Rennes (IRMAR) |
| CNRS : UMR6625 – Université de Rennes 1 – École normale supérieure de Cachan - ENS Cachan – Institut National des Sciences Appliquées (INSA) : - RENNES – Université de Rennes II - Haute Bretagne | |
| 2 : | Institut Camille Jordan (ICJ) |
| CNRS : UMR5208 – Université Claude Bernard - Lyon I – Ecole Centrale de Lyon – Institut National des Sciences Appliquées (INSA) - Lyon | |
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| Domaine | : | Mathématiques/Théorie des groupes |
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| semisimple algebraic group – local field – Bruhat-Tits building – geometric convergence – polyhedral compactification – amenability – distality |
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| Liste des fichiers attachés à ce document : | ||||||||||
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| hal-00004700, version 1 | |
| http://hal.archives-ouvertes.fr/hal-00004700 | |
| oai:hal.archives-ouvertes.fr:hal-00004700 | |
| Contributeur : Marie-Annick Guillemer | |
| Soumis le : Jeudi 14 Avril 2005, 11:32:32 | |
| Dernière modification le : Lundi 15 Mars 2010, 14:32:00 | |