Cocompact lattices of minimal covolume in rank 2 Kac-Moody groups, Part II
arXiv:1005.5702
Abstract
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 Γ_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.
This paper has been withdrawn by the authors since its results independent of an error in the previous version of arXiv:0907.1350 (Part I) are now incorporated into the replacement of arXiv:0907.1350