Semiprimitive local action finiteness conjecture for tree groups

Let TdT_d be the dd-regular tree, let Ω\Omega be a finite set, and let FSym(Ω)F\leq\operatorname{Sym}(\Omega) be semiprimitive, meaning that every normal subgroup of FF is either transitive or semiregular on Ω\Omega. Consider discrete subgroups of Aut(Td)\operatorname{Aut}(T_d) which locally act like FF and contain an involutive inversion. Semiprimitive local action finiteness conjecture. There are only finitely many conjugacy classes of such subgroups. The conjecture is presented as the converse to a necessary condition proved by Potočnik, Spiga, and Verret; the source mentions partial results but gives no resolution of this strengthened formulation.

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Primary source

Stephan Tornier, “Groups Acting on Trees With Prescribed Local Action”, arXiv:2002.09876 (2021).

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