How spinodal decomposition influences observables at FAIR energies

FAIR NExt generation of ScientistS 2013

Herold, Christoph^1,2,3 ; Nahrgang, Marlene^3,4 ; Mishustin, Igor^3,5 ; Bleicher, Marcus^2,3

School of Physics, Suranaree University of Technology, 111 University Avenue, Nakhon Ratchasima 30000, Thailand^1

Institut für Theoretische Physik, Goethe-Universität, Max-von-Laue-Str. 1, 60438 Frankfurt am Main, Germany^2

Frankfurt Institute for Advanced Studies (FIAS), Ruth-Moufang-Str. 1, 60438 Frankfurt am Main, Germany^3

Department of Physics and CTMS, Duke University, Durham, NC 27708, United States^4

Kurchatov Institute, National Research Center, 123182 Moscow, Russia^5

关键词: Coordinate space;    Correlation lengths;    Coupled systems;    First-order phase transitions;    Heavy ion collision;    Non-equilibrium dynamics;    Spatial fluctuation;    Spinodal instability;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/503/1/012004/pdf
DOI  :  10.1088/1742-6596/503/1/012004

来源: IOP

【 摘 要 】

The FAIR facility will make the region of high net-baryon densities experimentally accessible, where a first-order phase transition is conjectured. We investigate the dynamics of chiral symmetry breaking and the onset of confinement during a heavy-ion collision at large baryochemical potentials within a nonequilibrium chiral fluid dynamics model including effects of dissipation and noise. The order parameters are explicitly propagated and coupled to a fluid dynamically expanding medium of quarks. We demonstrate that the coupled system is strongly influenced by the nonequilibrium dynamics, leading only to a weak growth of the correlation length near the critical point. At the first-order phase transition, spinodal instabilities create domains in the order parameters and large spatial fluctuations in the baryon density within single events. As a consequence we find a clear enhancement of higher flow harmonics in coordinate space at the first-order phase transition in comparison with transitions through the crossover or critical point.