Abstract
We discuss the non-perturbative behavior of the U(1)_R symmetry in N=2 superconformal Chern-Simons theories coupled to matter in the (anti)fundamental and adjoint representations of the gauge group, which we take to be U(N). Inequalities constraining this behavior are obtained as consequences of spontaneous breaking of supersymmetry and Seiberg duality. This information reveals a web of RG flows connecting different interacting superconformal field theories in three dimensions. We observe that a subclass of these theories admits an ADE classification. In addition, we postulate new examples of Seiberg duality in N=2 and N=3 Chern-Simons-matter theories and point out interesting parallels with familiar non-perturbative properties in N=1 (adjoint) SQCD theories in four dimensions where the exact U(1)_R symmetry can be determined using a-maximization.
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