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Cocompact lattices of minimal covolume in rank 2 Kac-Moody groups, Part II

Inna (Korchagina) Capdeboscq and Anne Thomas
Arxiv ID: 1005.5702Last updated: 1/21/2020
Let G be a topological Kac-Moody group of rank 2 with symmetric Cartan matrix, defined over a finite field F_q. An example is G = SL(2,F_q((t^{-1}))). We determine a positive lower bound on the covolumes of cocompact lattices in G, and construct a cocompact lattice \Gamma_0 < G which realises this minimum. This completes the work begun in Part I, which considered the cases when G admits an edge-transitive lattice.

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