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# Exponential growth of Lie algebras of finite global dimension

Abstract : Let $X$ be a finite simply connected CW complex of dimension $n$. The loop space homology $H_*(\Omega X;\mathbb Q)$ is the universal enveloping algebra of a graded Lie algebra $L_X$ isomorphic with $\\pi_{*-1} (X)\otimes \mathbb Q$. Let $Q_X \subset L_X$ be a minimal generating subspace, and set $\alpha = \limsup_i \frac{\log\mbox{\scriptsize rk} \pi_i(X)}{i}$. Theorem: If $\mbox{dim}\, L_X = \infty$ and $\limsup (\mbox{dim} ( Q_X)_k)^{1/k} < \limsup (\mbox{dim} (L_X)_k)^{1/k}$ then $\sum_{i=1}^{n-1} \mbox{rk} \pi_{k+i}(X) = e^{(\alpha + \varepsilon_k)k} \hspace{1cm} \mbox{where} \varepsilon_k \to 0 \mbox{as} k\to \infty.$ In particular $\displaystyle\sum_{i=1}^{n-1} \mbox{rk} \pi_{k+i}(X)$ grows exponentially in $k$.
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https://hal.archives-ouvertes.fr/hal-00008857
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Submitted on : Monday, September 19, 2005 - 12:08:15 PM
Last modification on : Wednesday, October 20, 2021 - 3:18:42 AM
Long-term archiving on: : Thursday, April 1, 2010 - 10:28:04 PM

### Citation

yves Félix, Steve Halperin, Jean-Claude Thomas. Exponential growth of Lie algebras of finite global dimension. 2005. ⟨hal-00008857⟩

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