Horofunctions on the Heisenberg and Cartan groups

Autor:	Bodart, Corentin, Tashiro, Kenshiro
Rok vydání:	2024
Předmět:	Mathematics - Group Theory Mathematics - Metric Geometry
Druh dokumentu:	Working Paper
Popis:	We study the horofunction boundary of finitely generated nilpotent groups, and the natural group action on it. More specifically, we prove the followings results: For discrete Heisenberg groups, we classify the orbits of Busemann points. As a byproduct, we observe that the set of orbits is finite and the set of Busemann points is countable. Furthermore, using the approximation with Lie groups, we observe that the entire horoboundary is uncountable. For the discrete Cartan group, we exhibit an continuum of Busemann points, disproving a conjecture of Tointon and Yadin. As a byproduct, we prove that the group acts non-trivially on its reduced horoboundary, disproving a conjecture of Bader and Finkelshtein. Comment: 27 pages, 9 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2407.11943 Zobrazit plný text záznamu View this record from Arxiv