Abstract

We construct a natural sequence of finite-covolume reflection groups acting on the complex hyperbolic spaces ℂH 13, ℂH 9 and ℂH 5, and show that the 9-dimensional example coincides with the largest of the groups of Mostow [11]. Our reflection groups arise as automorphism groups of certain Lorentzian lattices over the Eisenstein integers, and we obtain our largest example by using the complex Leech lattice in a manner inspired by Conway [5]. We also construct finite-covolume reflection groups on the quaternionic hyperbolic spaces ?H 7, ?H 5 and ?H 3, again using the Leech lattice, and apply results of Borcherds [4] to obtain automorphic forms for our groups.

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