A van der Waals description with temperature-dependent degeneracy g(T) and effective chemical potential μ(T) reproduces the trace anomaly and its peak near the QCD crossover.
and Satarov, Leonid M
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Trace anomaly, effective degrees of freedom, and chemical potential effects near the QCD crossover
A van der Waals description with temperature-dependent degeneracy g(T) and effective chemical potential μ(T) reproduces the trace anomaly and its peak near the QCD crossover.