Translation-like actions of nilpotent groups
Translation-like actions of nilpotent groups
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幂零群的类翻译行为
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发表时间:
2017
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通讯作者:
Mark Pengitore
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作者:
D. Cohen;Mark Pengitore
We give a new obstruction to translation-like actions on nilpotent groups. Suppose we are given two finitely generated torsion-free nilpotent groups with the same degree of polynomial growth, but non-isomorphic Carnot completions (asymptotic cones). We show that there exists no injective Lipschitz function from one group to the other. It follows that neither group can act translation-like on the other. As Lipschitz injections need not be bi-Lipschitz embeddings, this is a strengthening of a classical result of Pansu in the context of groups of the same homogeneous dimension.