ON MIXED PHASES IN GAUGE THEORIES

In many gauge theories at different values of parameters entering Lagrangian, the vacuum is dominated by coherent condensates of different mutually non-local fields (for instance, by condensates of electric or magnetic charges, or by various dyons). It is argued that the transition between these "dual to each other" phases proceeds through an intermediate "mixed phase", having qualitatively different features. The examples considered include: ordinary YM, N = 1 SYM, N = 1 SQCD, and broken N = 2 SYM and SQCD.