Unexpected symmetries in classical moduli spaces

We analyze the structure of the moduli space of a supersymmetric SU(5) chiral gauge theory with two matter fields in the 10 representation and two fields in the bar 5 representation. Inspection of the exact Kaehler potential of the classical moduli space shows that the symmetry group of the moduli space is larger than the global symmetry group of the underlying gauge theory. As a consequence, the gauge theory has classical inequivalent vacua which yield identical low energy theories. copyright 1999 The American Physical Society