Cluster algebras of finite type via Coxeter elements and principal minors

Abstract

We give a uniform geometric realization for the cluster algebra of an arbitrary finite type with principal coefficients at an arbitrary acyclic seed. This algebra is realized as the coordinate ring of a certain reduced double Bruhat cell in the simply connected semisimple algebraic group of the same Cartan-Killing type. In this realization, the cluster variables appear as certain (generalized) principal minors.

38 pages, 2 figures; v2: minor editorial changes, to appear in Transformation Groups