The QCD phase transition in a fully dynamical model of heavy-ion collisions

14th International Conference on Strangeness in Quark Matter

Herold, Christoph^1,2 ; Nahrgang, Marlene^2,3 ; Mishustin, Igor^2,4 ; Bleicher, Marcus^1,2

Institut für Theoretische Physik, Goethe-Universität, Max-von-Laue-Str. 1, 60438 Frankfurt am Main, Germany^1

Frankfurt Institute for Advanced Studies (FIAS), Ruth-Moufang-Str. 1, 60438 Frankfurt am Main, Germany^2

Department of Physics and CTMS, Duke University, Durham, NC 27708, United States^3

Kurchatov Institute, National Research Center, 123182 Moscow, Russia^4

关键词: Critical slowing down;    Dynamical model;    First-order phase transitions;    Heavy ion collision;    Long wavelength;    Non equilibrium;    Non-equilibrium dynamics;    Order parameter;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/509/1/012065/pdf
DOI  :  10.1088/1742-6596/509/1/012065

来源: IOP

【 摘 要 】

Experimental signals for a possible QCD critical point and first-order phase transition are strongly influenced by the rapid nonequilibrium dynamics during a heavy-ion collision. In order to estimate and understand these effects we study the cooling through the phase transition within a nonequilibrium chiral fluid dynamics model. The order parameters for the chiral and deconfinement transition are explicitly propagated, taking into account dissipation and fluctuation stemming from the interaction with a quark-antiquark fluid. In studies of single events, we demonstrate how the formation of domains in net-baryon density at the first-order phase transition leads to a clear enhancement of higher flow harmonics. For the detection of the critical point it is crucial that the relevant signal survives the rapid dynamics. We observe critical slowing down and long-wavelength fluctuations in the vicinity of the critical point.