AMPLIFICATION OF PIONIC INSTABILITIES IN HIGH-ENERGY COLLISIONS

Considering a variety of dynamical scenarios within the linear a model , we examine the conditions for pionic modes to be amplified as the ch iral field relaxes towards the normal vacuum following the transient r estoration of approximate chiral symmetry in a high-energy collision. While Bjorken-type longitudinal expansions appear to be insufficient f or amplification for occur, analogous expansions in two or three dimen sions may enhance the low-energy power spectrum by up to an order of m agnitude.