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On a quantum analog of the Caldero-Chapoton formula. (English) Zbl 1237.16013
Finding a closed formula for all cluster variables in a cluster algebra in terms of an initial cluster is a nontrivial task. A construction, due to Caldero and Chapoton, relates cluster variables to the representations of a related quiver, with the use of quiver Grassmannians.
The aim of the present paper is the computation of cluster variables in a quantum cluster algebra of finite type and of all cluster variables in an almost acyclic cluster. The result is achieved by considering the $$\mathbb F$$-valued representations of a quiver related to the quantum cluster algebra and by showing that an analog of the Caldero-Chapoton map holds when $$q$$ is specialized to the order of $$\mathbb F$$. Several examples illustrate the procedure.

##### MSC:
 16G20 Representations of quivers and partially ordered sets 13F60 Cluster algebras 16T20 Ring-theoretic aspects of quantum groups
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