Four-dimensional QCD equation of state with multiple chemical potentials

TL;DR

This paper develops a four-dimensional equation of state model for hot, dense QCD matter, incorporating multiple chemical potentials, to improve relativistic hydrodynamic simulations of nuclear collisions.

Contribution

It introduces NEOS-4D, a novel EoS model that accounts for baryon, electric charge, and strangeness chemical potentials in relativistic QCD matter.

Findings

Enables multiple conserved charge evolution in relativistic fluids.

Integrates Lattice QCD and hadron resonance gas data.

Provides a numerical method for efficient implementation.

Abstract

We construct a four-dimensional version of the equation of state (EoS) model NEOS, NEOS-4D, as a function of the temperature and chemical potentials of baryon, electric charge, and strangeness for the hot and dense QCD matter created in relativistic nuclear collisions. This EoS enables multiple conserved charge current evolution in a relativistic fluid. Input from Lattice QCD simulations and a hadron resonance gas model is considered for constructing the equation of state. We investigate its applicability to the relativistic hydrodynamic description of nuclear collisions and present a method for efficient numerical implementation.