Speaker
Description
We study the contribution to the equation of state from mesonic correlations in the Polyakov-loop Nambu--Jona-Lasinio model within the Beth-Uhlenbeck approach, with a focus on the spacelike region of the spectral function. We show that the inclusion of such excitations leads to a significant increase of the pressure of the model near the pseudocritical temperature of the chiral phase transition and a significant meson momentum cut-off dependence in the mesonic pressure and the QCD trace anomaly. By means of the Feynman-Hellmann theorem, we show that the off-shell meson contribution to the chiral condensate can lead to a lowering of the chiral pseudocritical temperature, which may be essential to reduce the tension between PNJL mean field and lattice QCD results.
Based on K. Maslov and D. Blaschke, Phys. Rev. D 107, 094010. Research supported by Polish National Science Centre (NCN) under grant No. 2019/33/B/ST9/03059.
| Category | Theory |
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