Gießen 2024 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 34: Heavy-Ion Collisions and QCD Phases VIII
HK 34.3: Vortrag
Dienstag, 12. März 2024, 18:15–18:30, HBR 62: EG 18
Dynamic critical behavior of the O(4) chiral transition — •Frederic Klette1, Sören Schlichting1, and Lorenz von Smekal2 — 1Bielefeld University, Bielefeld, Germany — 2Justus Liebig University, Gießen, Germany
Evidence suggest that in the chiral limit, the QCD phase transition becomes a second order phasetransition in the Op4q universality class. Since real world QCD is not too far from the chiral limit, it is thus interesting to explore the consequences for static and dynamic correlation functions. Since, in the vicinity of the critical point, the physics is governed by universal scaling exponents and scaling functions, we can exploit this universality to address this question. We employ classical-statistical realtime simulations to extract the dynamic critical behavior of an O(4) linear sigma model in the static and dynamic universality class of QCD in the chiral limit. By comparing results for the dynamics with and without a conversed energy and O(4) charges, we can realize the Model A and Model G dynamic universality classes in the classification scheme of Halperin and Hohenberg, for which we compute the dynamic critical exponent z of and further extract the relevant dynamic scaling functions for the spectral function of the order parameter. Furthermore, we explore the intricacies of the dynamics of the charges in model G, focusing on the difference in the diffusive behaviour between vector and axial components, caused by the coupling between axial charges and the O(3) symmetric pion components of the order parameter field.
Keywords: universality; criticality; classical; chiral; dynamics