Impact Factor4.994

DOI number:10.1140/epjc/s10052-023-11261-z

Journal:The European Physical Journal C

Abstract:By linearly parameterizing the QCD Landau free energy near the critical point in the baryon chemical potential and temperature plane, we study the fluctuations of the QCD chiral order parameter field (the σ field) in the equilibrium case and dynamical phase transition, respectively. By setting the system size to the typical size of the QGP fireball (≈10^3 fm^3), we show that in the equilibrium case, the discontinuity of the order parameter in the first order phase transition region is replaced by smooth crossover, and the corresponding fluctuations are broadened. Meanwhile, the quartic cumulant κ4 of the σ field is generally negative near the phase transition line. We further derive the dynamical evolution of the QCD Landau free energy in the Fokker–Plank framework, based on which we deduce the dynamical cumulants of the σ field. Assuming the temperature decreases as a known function of time, we numerically evaluate the dynamical cumulants and confirm that the cumulants present clear memory effects. Moreover, the memory effects on the first order phase transition side is stronger than that on the crossover side, and the dynamical cumulants at the hypothetical freeze-out line present rich non-monotonic structures.

Indexed by:Journal paper

Volume:83

Page Number:117

Translation or Not:no

Included Journals:SCI

Links to published journals:https://doi.org/10.1140/epjc/s10052-023-11261-z