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In this talk, we present the recent development on the investigation of the deconfinement transition and QCD thermodynamics via the Landau gauge gluon and ghost propagators. The gluon and ghost propagators obtained by the lattice QCD simulation are fitted by the Gribov-Stingl form and then the thermodynamic potential of the gluonic sector is calculated. The Polyakov loop expectation value calculated by minimizing the thermodynamic potential shows a first and second order phase transitions for the pure SU(2) and SU(3) Yang-Mills theories, respectively. Then, thermodynamic quantities are quantitatively agreed with the lattice QCD data near the critical temperature with and without the dynamical quarks. Effects of the quark back reaction to the gluonic sector is also presented.

Polyakov loop and QCD thermodynamics from the Landau gauge gluon and ghost propagators