Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2001-12-20
Nucl.Phys. A742 (2004) 165-181
Physics
High Energy Physics
High Energy Physics - Phenomenology
21 pages, 8 figures. Expanded version including a discussion of the asymptotic degrees of freedom and of the gluon mass
Scientific paper
10.1016/j.nuclphysa.2004.06.017
We interpret lattice data for the equation of state of pure gauge $SU(3)_c$ by an evaporation model. At low temperatures gluons are frozen inside the gluon condensate, whose dynamics is described in terms of a dilaton lagrangian. Above the critical temperature quasi-free gluons evaporate from the condensate: a first order transition is obtained by minimizing the thermodynamical potential of the system. Within the model it is possible to reproduce lattice QCD results at finite temperature for thermodynamical quantities such as pressure and energy. The gluonic longitudinal mass can also be evaluated; it vanishes below the critical temperature, where it shows a discontinuity. At very large temperatures we recover the perturbative scenario and gluons are the only asymptotic degrees of freedom.
Drago Alessandro
Gibilisco Marina
Ratti Claudia
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