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QCD Thermodynamics at Intermediate Coupling

The weak‐coupling expansion of the QCD free energy is known to order gs6 log gs, however, the resulting series is poorly convergent at phenomenologically relevant temperatures. In this proceedings, I discuss hard‐thermal‐loop perturbation theory (HTLpt) which is a gauge‐invariant reorganization of the perturbative expansion for gauge theories. I review a recent NNLO HTLpt calculation of QCD thermodynamic functions. I show that the NNLO HTLpt results are consistent with lattice data down to temperatures ∼2Tc.