A Cluster Character with Coefficients for Cluster Category

Abstract

We introduce a new cluster character with coefficients for a cluster category $\mathcal{C}$ and rather than using a Frobenius $2$-Calabi-Yau realization to incorporate coefficients into the representation-theoretic model for a cluster algebra, as done by Fu and Keller, we exploit intrinsic properties of $\mathcal{C}$. For this purpose, we define an ice quiver associated to each cluster tilting object in $\mathcal{C}$. In Dynkin case $\mathbb{A}_n$, we also prove that the mutation class of the ice quiver associated to the cluster tilting object given by the direct sum of all projective objects is in bijection with set of ice quivers of cluster tilting objects in $\mathcal{C}$.