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HK: Fachverband Physik der Hadronen und Kerne
HK 34: Heavy-Ion Collisions and QCD Phases VIII
HK 34.1: Group Report
Tuesday, March 12, 2024, 17:30–18:00, HBR 62: EG 18
Real-time methods for critical dynamics — Mattis Harhoff3, Frederic Klette3, Patrick Niekamp1, •Johannes Roth1, Sören Schlichting3, Leon Sieke1, Lorenz von Smekal1,2, and Yunxin Ye3 — 1Institut für Theoretische Physik, Justus-Liebig-Universität, 35392 Giessen, Germany — 2Helmholtz Research Academy Hesse for FAIR (HFHF), Campus Giessen — 3Fakultät für Physik, Universität Bielefeld, 33615 Bielefeld, Germany
In this group report, I will give an overview on the non-perturbative real-time methods we use to study the universal critical dynamics relevant for the chiral transition and the QCD critical point, following our general goal of bringing the phenomenology of heavy-ion collisions closer to the theory of the QCD phase diagram. In addition to the corresponding static universality classes, the relevant universal dynamics is believed to be given by that of a four-component Heisenberg antiferromagnet (Model G, in the classification by Halperin and Hohenberg) and of a single-component fluid (Model H). Our main calculational methods are the functional renormalization group, both directly formulated on the Schwinger-Keldysh contour or analytically continued from Euclidean spacetime, and ab-initio classical-statistical lattice simulations. I will show how our calculated real-time observables such as spectral functions can be used to gain insight into the universal dynamics of QCD matter close to a second-order phase transition.
Keywords: QCD phase diagram; chiral phase transition; QCD critical point; critical dynamics; functional renormalization group