Spinodal Instability and Confinement
  It is pointed out that inhomogeneous condensates or spinodal instabilities suppress the propagation of elementary excitations due to the absorptive zero mode dynamics. This mechanism is shown to be present in the scalar phi4 model and in Quantum Gravity. It is conjectured that the plane waves states of color charges have vanishing scattering amplitude owing to the color condensate in the vacuum. 
Janos Polonyi