Glueballs, gluon condensate, and pure glue QCD below Tc
Abstract
A quasiparticle description of pure glue QCD thermodynamics at T<Tc is proposed and compared to recent lattice data. Given that a gas of glueballs with constant mass cannot quantitatively reproduce the early stages of the deconfinement phase transition, the problem is to identify a relevant mechanism leading to the observed sudden increase of the pressure, trace anomaly, etc. It is shown that the strong decrease of the gluon condensate near Tc combined with the increasing thermal width of the lightest glueballs might be the trigger of the phase transition.
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