Modular Symmetry and Fractional Charges in N = 2 Supersymmetric Yang-Mills and the Quantum Hall Effect


The parallel rôles of modular symmetry in N = 2 supersymmetric SU(2) Yang-Mills and in the quantum Hall effect are reviewed. In both cases modular symmetry implies a fractal structure for the vacuum with an infinite hierarchy of related phases connected by quantum phase transitions. Infra-red fixed points at strong coupling correspond to θ-vacua… (More)


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