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 46.1: Gruppenbericht
Mittwoch, 30. März 2022, 16:00–16:30, HK-H2
Regulator dependence of the chiral phase transition at high densitities — Konstantin Otto1, •Christopher Busch1,2, and Bernd-Jochen Schaefer1,2 — 1Institut für Theoretische Physik, Justus-Liebig-Universität Gießen — 2Helmholtz Forschungsakademie Hessen für FAIR (HFHF)
Functional methods like the functional renormalization group (FRG) provide a powerful tool for the study of non-perturbative phenomena such as the spontaneous breaking of chiral symmetry in QCD. Recent FRG investigations of the QCD phase diagram at low temperature and high densities show a strange back-bending of the chiral phase transition line combined with the appearance of a negative entropy density in the chirally symmetric phase. Among possible physical reasons for these observations technical artifacts caused by common FRG truncation schemes are part of ongoing discussions. In this talk we will focus on this issue and will elucidate the role played by different FRG regulator choices. First results of the regulator effects in this regime of the phase diagram will be given.