Finiteness and uniqueness of duality cascades in three dimensions for affine quivers

Abstract For three-dimensional circular-quiver supersymmetric Chern–Simons theories, the questions, whether duality cascades always terminate and whether the endpoint is unique, were rephrased into the question whether a polytope defined in the parameter space of relative ranks for duality cascades is a parallelotope, filling the space by discrete translations. By regarding circular quivers as affine Dynkin diagrams, we generalize the arguments into other affine quivers. We find that, after rewriting properties into the group-theoretical language, most arguments work in the generalizations. Especially, we find that, instead of the original relation to parallelotopes, the corresponding polytope still fills the parameter space but with some gaps. This indicates that, under certain restrictions, duality cascades still terminate uniquely.