Erlangen 2026 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 32: Heavy-Ion Collisions and QCD Phases V
HK 32.4: Talk
Thursday, March 19, 2026, 14:45–15:00, PHIL C 601
Universal scaling of transport coefficients near the QCD critical point — •Johannes Roth1, Yunxin Ye2, Sören Schlichting3, and Lorenz von Smekal1,4 — 1Institut für Theoretische Physik, Justus-Liebig-Universität, 35392 Giessen, Germany — 2Theoretisch-Physikalisches Institut, Abbe Center of Photonics, Friedrich-Schiller-Universität Jena, 07743 Jena, Germany — 3Fakultät für Physik, Universität Bielefeld, 33615 Bielefeld, Germany — 4Helmholtz Research Academy Hesse for FAIR (HFHF), Campus Giessen
Near a critical point, including the one conjectured in the QCD phase diagram at finite baryon chemical potential, the slow dynamics of long-wavelength modes is expected to become universal. I will review the argument for the associated dynamic universality class being that of Model H in the Halperin-Hohenberg classification, i.e., that of a liquid-gas critical point. Based on a novel real-time formulation of the functional renormalization group, I will present results for universal scaling functions of the thermal diffusivity and the shear viscosity, and discuss their relevance in the ongoing search for the QCD critical point.
Keywords: QCD phase diagram; QCD critical point; dynamic critical behavior; functional renormalization group; transport coefficients