Thermodynamics of the glueball resonance gas

We study the thermodynamic properties -- pressure, entropy and trace anomaly of a gas glueballs that includes glueball states obtained by various lattice simulations. show this model, called Glueball Resonance Gas (GRG) approach, describes well thermal Yang-Mills sector QCD below critical temperature $T_c$, provided $T_c$ is properly matched to corresponding determination masses, obtaining $T_c \sim 320 \pm 20$ MeV. The inclusion into GRG heavier not yet seen on lattice, assuming follow Regge trajectories as quark-antiquark do, leads only small correction. consider contribution pressure interactions between scalar-scalar tensor-tensor glueballs, which turn out be also negligible.