Compactification de Chabauty de l'espace des sous-groupes de Cartan de SLn(R)

Details Compactification de Chabauty de l'espace des sous-groupes de Cartan de SLn(R) Compactification de Chabauty de l'espace des sous-groupes de Cartan de SLn(R)

2012-01-20

arxiv.org/abs/1201.4274v1

Mathematics

Geometric Topology

29 pages, 2 figures, in french

Scientific paper

Let G be a real semisimple Lie group with finite center, with a finite number of connected components and without compact factor. We are interested in the homogeneous space of Cartan subgroups of G, which can be also seen as the space of maximal flats of the symmetric space of G. We define its Chabauty compactification as the closure in the space of closed subgroups of G, endowed with the Chabauty topology. We show that when the real rank of G is 1, or when G=SL3(R) or SL4(R), this compactification is the set of all closed connected abelian subgroups of dimension the real rank of G, with real spectrum. And in the case of SL3(R), we study its topology more closely and we show that it is simply connected.

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