Manifolds counting and class field towers

Details Manifolds counting and class field towers Manifolds counting and class field towers

2009-05-12

arxiv.org/abs/0905.1841v2

Mathematics

Group Theory

27 pages, a small change in title, final revision, to appear in Adv. Math

Scientific paper

In [BGLM] and [GLNP] it was conjectured that if $H$ is a simple Lie group of real rank at least 2, then the number of conjugacy classes of (arithmetic) lattices in $H$ of covolume at most $x$ is $x^{(\gamma(H)+o(1))\log x/\log\log x}$ where $\gamma(H)$ is an explicit constant computable from the (absolute) root system of $H$. In this paper we prove that this conjecture is false. In fact, we show that the growth is at rate $x^{c\log x}$. A crucial ingredient of the proof is the existence of towers of field extensions with bounded root discriminant which follows from the seminal work of Golod and Shafarevich on class field towers.

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