Analytical study of a gas of gluonic quasiparticles at high temperature: effective mass, pressure and trace anomaly

摘要

The thermodynamical properties of a pure Yang-Mills theory SU(N) is describedby a gas of gluonic quasiparticles with temperature dependent mass $m(T)$ and abag function $B(T).$ The analytic behavior of $m(T)$ and the pressure $p$ athigh $T$ are derived and constraints on the parameters defining $B(T)$ arediscussed. The trace anomaly $\theta=\rho-3p$ is evaluated in the high $T$domain: it is dominated by a quadratic behavior $\theta =nKT^{2},$ where$n=2(N^{2}-1)$ is the number of degrees of freedom and $K$ is an integrationconstant which does not depend on the bag function $B(T)$. This is a generalresult which is in very good agreement with recent lattice simulations.