Mainz 2022 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 46: Heavy-Ion Collisions and QCD Phases X
HK 46.3: Vortrag
Mittwoch, 30. März 2022, 16:45–17:00, HK-H2
Phase structure and thermodynamics of QCD from Dyson–Schwinger equations — •Philipp Isserstedt1,3, Michael Buballa2,3, Christian S. Fischer1,3, Pascal J. Gunkel1,3, and Thorsten Steinert1 — 1Institut für Theoretische Physik, Justus-Liebig-Universität Gießen, 35392 Gießen, Germany — 2Technische Universität Darmstadt, Department of Physics, Institut für Kernphysik, Theoriezentrum, 64289 Darmstadt, Germany — 3Helmholtz Forschungsakademie Hessen für FAIR (HFHF), Germany
We summarize our recent results on the phase structure and thermodynamics of QCD obtained within the nonperturbative framework of Dyson–Schwinger equations. Our results are based on solutions to a truncated set of these equations for the quark and gluon propagators of (2 + 1)-flavor QCD in Landau gauge. First, we present baryon number fluctuations and ratios thereof, ranging from vanishing chemical potential up to the critical endpoint. In comparison with experimental data, our results are compatible with the scenario of a critical endpoint at large chemical potential and a freeze-out line that bends below the endpoint [1]. Second, we discuss a truncation-independent method to obtain thermodynamic quantities like the pressure, entropy density, energy density, and interaction measure across the QCD phase diagram from Dyson–Schwinger equations [2], which has been accomplished so far only within simple truncations of the rainbow-ladder type.
[1] Phys. Rev. D 100, 074011 (2019), arXiv:1906.11644 [hep-ph].
[2] Phys. Rev. D 103, 054012 (2021), arXiv:2012.04991 [hep-ph].