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arXiv · 2611.09352

On the existence of automorphisms acting expansively on the space of one-parameter subgroups of connected Lie groups

Himanshu Lekharu·Riddhi Shah
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Abstract

For a connected Lie group $G$, we consider the action of Aut$(G)$ on Sub$_G$, the set of all closed subgroups of $G$ endowed with the Chabauty topology. We study the action of automorphisms of $G$ on Sub$^p_G$, the closure of the set of all closed one-parameter subgroups of $G$ in Sub$_G$, in terms of expansivity. We show that a nontrivial connected Lie group $G$ with dim$(G)\geq 2$ does not admit any automorphism which acts expansively on Sub$^p_G$. We also show that a certain class of subgroups of Aut$(G)$, which include all one-parameter groups of automorphisms in Aut$(G)$, do not act expansively on Sub$^p_G$. These results generalise a results of Chatterjee, Lekharu and Shah on tori and those of Prajapati and Shah on connected Lie groups of dimension greater than $1$.

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Himanshu Lekharu, Riddhi Shah. 2026-11-06. On the existence of automorphisms acting expansively on the space of one-parameter subgroups of connected Lie groups. https://arxiv.org/abs/2611.09352

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