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The quasi-particle model of quark gluon plasma (QGP) is revisited here withthermodynamically consistent formalism, different from earlier studies, withoutthe need of temperature dependent bag constant as well as other effects such asconfinement effects, effective degrees of freedom etc. Our model has only onesystem dependent parameter and surpraisingly good fit to lattice results forgluon plasma, 2-flavor and 3-flavor QGP are obtained. The basic idea is toevaluate energy density $\epsilon$ first from grand partition function ofquasi-particle QGP and then derive all other thermodynamic functions from$\epsilon$. Quasi-particles are assumed to have temperature dependent massequal to plasma frequency. Energy density, pressure and speed of sound areevaluated and compared with available lattice data. We further extend the modelto finite chemical potential, without any new parameters, to obtain quarkdensity, quark susceptibility etc. and fits very well with the lattice resultson 2-flavor QGP.Comment: 7 pages (LaTex), 6 figures, revised with correction and new result

Revisiting the quasi-particle model of the quark–gluon plasma