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.

Topics
Free energy, Thermodynamics, Gauge theory, Gauge field theory, Perturbation theory
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© 2011 American Institute of Physics.
2011
American Institute of Physics
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