Correlations of conserved charges and QCD phase structure

Abstract

Correlations of conserved charges, i.e., the baryon number, electric charge and the strangeness, have been calculated at finite temperature and chemical potential up to the fourth order. The calculations are done in a 2+1 flavor low energy effective theory, where quantum and thermal fluctuations are encoded through the evolution of flow equations within the functional renormalization group approach. Strangeness neutrality and a fixed ratio of the electric charge to the baryon number density are implemented throughout the computation. We find that higher-order correlations carry more sensitive critical dynamics in comparison to the quadratic ones, and a non-monotonic dependence of the fourth-order correlations between the baryon number and strangeness, $-{\chi }_{31}^{BS}/{\chi }_2^S$ and ${\chi }_{22}^{BS}/{\chi }_2^S$, on the collision energy is found.

14 pages, 9 figures, 1 table; v2: discussion and Fig.5 added

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Cited by in corpus (5)

• QCD at finite temperature and density within the fRG approach: An overview
• Shocks and quark-meson scatterings at large density
• Ripples of the QCD Critical Point
• Real-time dynamics of the $O(4)$ scalar theory within the fRG approach
• Critical behaviors of the $O(4)$ and $Z(2)$ symmetries in the QCD phase diagram