Exact results on the space of vacua of four-dimensional SUSY gauge theories

Four-dimensional quantum field theories which have a continuous manifold of inequivalent exact ground states a moduli space of vacua are considered, finding that singularities can be smoothed out and new massless states appear there.

Abstract

We consider four dimensional quantum field theories which have a continuous\nmanifold of inequivalent exact ground states -- a moduli space of vacua.\nClassically, the singular points on the moduli space are associated with extra\nmassless particles. Quantum mechanically these singularities can be smoothed\nout. Alternatively, new massless states appear there. These may be the\nelementary massless particles or new massless bound states.\n