Abstract
We provide new arguments to see topological Kac-Moody groups as generalized semisimple groups over local fields: they are products of topologically simple groups and their Iwahori subgroups are the normalizers of the pro-p Sylow subgroups. We use a dynamical characterization of parabolic subgroups to prove that some countable Kac-Moody groups with Fuchsian buildings are not linear. We show for this that the linearity of a countable Kac-Moody group implies the existence of a closed embedding of the corresponding topological group in a non-Archimedean simple Lie group, thanks to a commensurator super-rigidity theorem proved in the Appendix by P. Bonvin.
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Rémy, B., Bonvin, P. Topological simplicity, commensurator super-rigidity and nonlinearities of Kac-Moody groups (appendix by P. Bonvin). Geom. funct. anal. 14, 810–852 (2004). https://doi.org/10.1007/s00039-004-0476-5
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DOI: https://doi.org/10.1007/s00039-004-0476-5