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math.GR2026
Critical-exponent spectra and rank two inverse realization on biregular trees
Sanghoon Kwon
We study the critical-exponent, or equivalently entropy, spectrum arising from free type-preserving actions on the biregular tree . For an action with a nonem…
math.GR2023
Zeta functions of geometrically finite graphs of groups
Soonki Hong, Sanghoon Kwon
In this paper, we explore the properties of zeta functions associated with infinite graphs of groups that arise as quotients of cuspidal tree-lattices, including all non-uniform ar…