Interface Effect in QCD Phase Transitions via Dyson-Schwinger Equation Approach

TL;DR

This paper investigates the phase diagram of QCD matter using Dyson-Schwinger equations, focusing on interface effects and entropy changes during first order phase transitions, providing new insights into the inhomogeneity and entropy puzzle.

Contribution

It introduces a method to incorporate interface effects into the QCD phase diagram within the Dyson-Schwinger framework, addressing the entropy puzzle in hadronization.

Findings

Interface tension and entropy density are calculated.

Total entropy density increases during phase transitions.

The entropy puzzle in hadronization is resolved.

Abstract

With the chiral susceptibility criterion we obtain the phase diagram of strong-interaction matter in terms of temperature and chemical potential in the framework of Dyson-Schwinger equations (DSEs) of QCD.After calculating the pressure and some other thermodynamic properties of the matter in the DSE method, we get the phase diagram in terms of temperature and baryon number density. We also obtain the interface tension and the interface entropy density to describe the inhomogeneity of the two phases in the coexistence region of the first order phase transition. After including the interface effect, we find that the total entropy density of the system increases in both the deconfinement (dynamical chiral symmetry restoration) and the hadronization (dynamical chiral symmetry breaking) processes of the first order phase transitions and thus solve the entropy puzzle in the hadronization process.