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Diophantine properties of nilpotent Lie groups

Published online by Cambridge University Press:  13 January 2015

Menny Aka
Section de mathématiques, EPFL, Station 8 - Bât. MA, CH-1015 Lausanne, Switzerland email
Emmanuel Breuillard
Laboratoire de Mathématiques, Bâtiment 425, Université Paris Sud 11, 91405 Orsay, France email
Lior Rosenzweig
Department of Mathematics, KTH, SE-100 44 Stockholm, Sweden email
Nicolas de Saxcé
Einstein Institute of Mathematics, Givat Ram, The Hebrew University, Jerusalem, 91904, Israel email
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A finitely generated subgroup ${\rm\Gamma}$ of a real Lie group $G$ is said to be Diophantine if there is ${\it\beta}>0$ such that non-trivial elements in the word ball $B_{{\rm\Gamma}}(n)$ centered at $1\in {\rm\Gamma}$ never approach the identity of $G$ closer than $|B_{{\rm\Gamma}}(n)|^{-{\it\beta}}$. A Lie group $G$ is said to be Diophantine if for every $k\geqslant 1$ a random $k$-tuple in $G$ generates a Diophantine subgroup. Semi-simple Lie groups are conjectured to be Diophantine but very little is proven in this direction. We give a characterization of Diophantine nilpotent Lie groups in terms of the ideal of laws of their Lie algebra. In particular we show that nilpotent Lie groups of class at most $5$, or derived length at most $2$, as well as rational nilpotent Lie groups are Diophantine. We also find that there are non-Diophantine nilpotent and solvable (non-nilpotent) Lie groups.

Research Article
© The Authors 2015 


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