Thermodynamic Properties of Strongly Interacting Matter at Non-zero Baryon Number Density

TL;DR

This paper reports lattice QCD results on thermodynamics at non-zero baryon density, showing agreement with hadron resonance gas and quark-gluon gas models, and discusses phase transition signals via Taylor series convergence.

Contribution

It provides new lattice QCD data at finite baryon density using a 6th order Taylor expansion and analyzes the phase transition implications.

Findings

Thermodynamic observables match hadron resonance gas at low T.

Results align with ideal quark-gluon gas at high T.

Taylor series convergence suggests a possible critical point.

Abstract

We present recent lattice results on QCD thermodynamics at non-vanishing baryon number density obtained from a 6th order Taylor expansion in the chemical potential. Results for bulk thermodynamic observables, in particular for fluctuations in the baryon number density, are found to be well described by a hadron resonance gas model at low temperature and an ideal quark gluon gas at high temperature. We also analyze the radius of convergence of the Taylor series and discuss the information it provides on the occurrence of a second order phase transition point in the QCD phase diagram.