Köln 2025 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 42: Heavy-Ion Collisions and QCD Phases VII
HK 42.1: Group Report
Thursday, March 13, 2025, 14:00–14:30, HS 3 Chemie
Universal critical dynamics in QCD — •Johannes Roth1, Yunxin Ye2, Sören Schlichting2, and Lorenz von Smekal1,3 — 1Institut für Theoretische Physik, Justus-Liebig-Universität, 35392 Giessen, Germany — 2Fakultät für Physik, Universität Bielefeld, 33615 Bielefeld, Germany — 3Helmholtz Research Academy Hesse for FAIR (HFHF), Campus Giessen
In this group report, I will give an overview of the universal critical dynamics at the chiral phase transition of two-flavor QCD in the chiral limit. I will review the argument by Rajagopal and Wilczek of the associated dynamic universality class being ‘Model G’ from the Halperin-Hohenberg classification. To extract dynamic universal quantities, we use a novel formulation of the functional renormalization group for dynamical systems with ‘reversible mode couplings’. I will show results for dynamic universal quantities such as the non-trivial value z=d/2 of the dynamic critical exponent at the ‘strong-scaling’ fixed point (where d is the number of spatial dimensions) and for dynamic universal scaling functions. Finally, I will outline how the same method can be used to study the universal dynamics at the QCD critical point, with the dynamic universality class being ‘Model H’ in this case.
Keywords: QCD phase diagram; chiral phase transition; QCD critical point; critical dynamics; functional renormalization group