Equation of state at non-zero baryon density based on lattice QCD

TL;DR

This paper extends the lattice QCD equation of state to finite baryon density using Taylor expansion coefficients, connecting it smoothly with the hadron resonance gas model at low temperatures.

Contribution

It introduces a parametrization of the lattice QCD equation of state at non-zero baryon density that accounts for lattice spacing and quark mass effects.

Findings

Taylor coefficients match hadron resonance gas at low T

Smooth connection between lattice QCD and HRG models

Enhanced understanding of QCD matter at finite density

Abstract

We employ the lattice QCD data on Taylor expansion coefficients to extend our previous parametrization of the equation of state to finite baryon density. When we take into account lattice spacing and quark mass dependence of the hadron masses, the Taylor coefficients at low temperature are equal to those of hadron resonance gas. Parametrized lattice equation of state can thus be smoothly connected to the hadron resonance gas equation of state at low temperatures.