Some Phenomenological Properties of the Chiral Transition in QCD

On the basis of the NJL model as an effective theory of QCD and analogieswith condensed matter physics, we extract simple physical pictures of thechiral phase transition at finite temperature $T$ and/or chemical potential$\mu$ and predict interesting phenomena associated with the phase transitionwhich may be seen in relativistic heavy-ion collisions to be performed in RHICor LHC. We indicate that the macroscopic equation describing non-equilibriumphenomena of the chiral transition like DCC might be given by a diffusion-likeequation rather than a wave equation especially when the baryon density ispresent.Comment: LaTex 9 pages. No figure. Talk presented at YITP International Workshop on Physics of Relativistic Heavy Ion Collisions, 9-11 June 1997, Kyoto, JAPAN. To be published in Supplement of Prog. Theor. Phy