Subgroup growth of lattices in semisimple Lie groups

Details Subgroup growth of lattices in semisimple Lie groups Subgroup growth of lattices in semisimple Lie groups

2004-06-09

arxiv.org/abs/math/0406164v1

Mathematics

Group Theory

34 pages

Scientific paper

We give very precise bounds for the congruence subgroup growth of arithmetic groups. This allows us to determine the subgroup growth of irreducible lattices of semisimple Lie groups. In the most general case our results depend on the Generalized Riemann Hypothesis for number fields but we can state the following unconditional theorem: Let $G$ be a simple Lie group of real rank at least 2, different than $D_4(\bbc)$, and let $\Gamma$ be any non-uniform lattice of $G$. Let $s_n(\Gamma)$ denote the number of subgroups of index at most $n$ in $\Gamma$. Then the limit $\lim\limits_{n\to \infty} \frac{\log s_n(\Gamma)}{(\log n)^2/ \log \log n}$ exists and equals a constant $\gamma(G)$ which depends only on the Lie type of $G$ and can be easily computed from its root system.

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