Electromagnetic Fields in the QCD Vacuum
  Quarks play an active role in shaping the QCD vacuum structure. Being dual carriers of both `color' and `electric' charges they also respond to externally applied electromagnetic fields. Thus, in principle, the vacuum of strong interactions influences higher order QED processes such as photon-photon scattering. We survey here the current status of the understanding of the vacuum structure of strong interactions, and take a fresh look at its electromagnetic properties. 
Johann Rafelski (Department of Physics, University of Arizona, Tucson,   AZ) and H.-Thomas Elze (Instituto de Fisica, UFRJ, ...