Vp. Nair, HARD THERMAL LOOPS, GAUGED WZNW ACTION, AND THE ENERGY OF HOT QUARK-GLUON PLASMA, Physical review. D. Particles and fields, 48(8), 1993, pp. 3432-3435
The generating functional for hard thermal loops in quantum chromodyna
mics is rewritten in terms of a gauged Wess-Zumino-Novikov-Witten acti
on by introducing an auxiliary field. This shows in a simple way that
the contribution of hard thermal loops to the energy of the quark-gluo
n plasma is positive.