Conditions for confinement and freeze-out
Instituto Superior Técnico, Centro de Fisíca das Interacções Fundamentais (CFIF), Av. Rovisco Pais, 1049-001, Lisbon, Portugal
2 Fakultät fur Physik, Universität Bielefeld, Postfach 100 131, 33501, Bielefeld, Germany
Matter implies the existence of a large-scale connected cluster of a uniform nature. The appearance of such clusters as a function of hadron density is specified by percolation theory. We can therefore formulate the freeze-out of interacting hadronic matter in terms of the percolation of hadronic clusters. The resulting freeze-out condition as a function of temperature and baryo-chemical potential interpolates between resonance gas behavior at low baryon density and repulsive nucleonic matter at low temperature, and it agrees well with the data.
© Springer-Verlag, 2003