On the distortion of twin building lattices

Details On the distortion of twin building lattices On the distortion of twin building lattices

2009-08-23

arxiv.org/abs/0908.3309v1

Mathematics

Group Theory

Scientific paper

We show that twin building lattices are undistorted in their ambient group; equivalently, the orbit map of the lattice to the product of the associated twin buildings is a quasi-isometric embedding. As a consequence, we provide an estimate of the quasi-flat rank of these lattices, which implies that there are infinitely many quasi-isometry classes of finitely presented simple groups. In an appendix, we describe how non-distortion of lattices is related to the integrability of the structural cocycle.

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