Speed of sound in the QGP and an SU(3) Yang-Mills theory

Abstract

The speed of sound Cs in the SU(3) and (2+1) QCD is calculated within the field correlator method using the nonperturbative color magnetic confinement and Polyakov loop interaction in the deconfined region.The resulting Cs displays a discontinuity at T=Tc in the SU(3) case. It is shown numerically and analytically that Cs2 never exceeds 13 both for SU(3) and (2+1) QCD for vanishing chemical potential. A good agreement is found of our numerical results with the corresponding lattice data.