Generalized Cluster Algebra Homomorphisms Induced by Cluster Tube Embeddings

Abstract

We relate multiplication formulas for regular modules in coefficient-free acyclic affine cluster algebras with skew-symmetric exchange matrices to the imaginary exchange relations of Reading-Stella. Introducing a parameter $z$ into the construction of Zhou-Zhu, we define a weighted cluster character on cluster tubes that satisfies generalized exchange relations of type $C_{n-1}$ and yields a bijection between indecomposable rigid objects and cluster variables. Using the multiplication formulas and difference property of Ding-Xiao-Xu, we show that non-homogeneous tube embeddings induce injective homomorphisms into ordinary affine cluster algebras under $z\mapsto X_δ$. Comparison with Reading-Stella's relations identifies $X_δ$ with the corresponding theta function, giving a representation-theoretic interpretation of the generalized exchange parameter.