Nonequilibrium Photons as a Signature of Quark-hadron Phase Transition

Abstract

We study the nonequilibrium photon production in the quark-hadron phase transition, using the Friedberg-Lee type solitons as a working model for quark-hadron physics. We propose that to search for nonequilibrium photons in the direct photon measurements of heavy-ion collisions may be a characteristic test of the transition from the quark-gluon to hadronic phases.

Comments: 16 pages, RevTex, including 4 eps figures