Quark-gluon plasma cooling through pion emission in a chiral bag model

A hypothetical quark-gluon plasma is described as a large bag, filled with quarks, antiquarks, and gluons, of radius R ∼ 2-6 fm and temperature T ∼ 100-250 MeV. We consider the cooling of this plasma through pion emission at the bag surface in a chiral-model approach. Comparison is made between results for a large, spherical bag and a model in the limit in which the plasma fills half of space and pion emission is across a planar interface. We find a rather low initial cooling rate per unit surface area for this mechanism, of roughly (10-100) × 1023 MeV/fm2.s. This rate per unit surface becomes independent of R for R ≥ 3 fm, and, because of the nature of the coupling in the chiral bag model, varies with temperature as T6. © 1985.

Duke Scholars

Author Berndt Mueller Physics