Paul Ziegler (Technical University of Munich): A Tannakian formalism for Bruhat-Tits buildings

Abstract: By Goldman-Iwahori, the Bruhat-Tits building of the general linear group GL_n over a local field k can be described as the set of non-archimedean norms on the vector space k^n. I will explain how via a Tannakian formalism this can be generalized to a concrete description of the Bruhat-Tits building of an arbitrary reductive group. This also gives a description of the functor of points of Bruhat-Tits group schemes.

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https://uni-frankfurt.zoom.us/j/62173091959?pwd=eVFsaE5ndm1hVGdXQk5XTHZKWHBRZz09