科研之友
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摘要
The thermodynamical properties of a pure Yang-Mills theory SU(N) is described by a gas of gluonic quasiparticles with temperature-dependent mass m(T) and a bag function B(T). The analytic behavior of m(T) and the pressure p in the temperature range 2.5-5T(c) are derived and constraints on the parameters defining B(T) are discussed. 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 integration constant which does not depend on the bag function B(T). The quadratic rise of theta is in good agreement with recent lattice simulations.
