Disoriented Chiral Condensates in Hadron-Hadron Collisions
  We review recent progress in the description and understanding of disoriented chiral condensates. Certain important unsolved issues are underlined, and the preliminary results of our program of investigation of these issues in the framework of the classical linear sigma model are reported. We also briefly review a formalism which could be useful at the full non-equilibrium quantum field theory level of analysis. 
G. Amelino-Camelia, J.D. Bjorken, and S.E. Larsson