Photon Production from Nonequilibrium Disoriented Chiral Condensates in a Spherical Expansion

Abstract

We study the production of photons through the non-equilibrium relaxation of a disoriented chiral condensate formed in the expanding hot central region in ultra-relativistic heavy-ion collisions. It is found that the expansion smoothes out the resonances in the process of parametric amplification such that the non-equilibrium photons are dominant to the thermal photons over the range 0.2-2 GeV. We propose that to search for non-equilibrium photons in the direct photon measurements of heavy-ion collisions can be a potential test of the formation of disoriented chiral condensates.

13 pages, 3 figures

References in corpus (4)

• Direct Photons from Relativistic Heavy-Ion Collisions
• Hard Thermal Photon Production in Relativistic Heavy Ion Collisions
• Localized Charged-Neutral Fluctuations in 158 A GeV Pb+Pb Collisions
• Direct photons: a nonequilibrium signal of the expanding quark-gluon plasma

Cited by in corpus (5)

• Disoriented Chiral Condensate: Theory and Experiment
• Influence on electron coherence from quantum electromagnetic fields in the presence of conducting plates
• Nonequilibrium dynamics of moving mirrors in quantum fields: Influence functional and Langevin equation
• Nonequilibrium Effects and Baryogenesis
• Photon production from non-equilibrium disoriented chiral condensates in a longitudinal expansion : A theoretic framework