Criticality in a Hadron Resonance Gas model with the van der Waals interaction

TL;DR

This paper incorporates van der Waals interactions into a Hadron Resonance Gas model, successfully fitting lattice QCD data and revealing a phase transition with a specific critical point.

Contribution

It introduces a Hadron Resonance Gas model with van der Waals interactions that accurately describes lattice QCD data and identifies a phase transition with a critical point.

Findings

Model fits lattice QCD data well

Identifies a phase transition at T=62.1 MeV and μ_B=708 MeV

Determines van der Waals parameters a and r

Abstract

The van der Waals interaction is implemented in a Hadron Resonance Gas model. It is shown that this model can describe Lattice QCD data of different thermodynamical quantities satisfactorily with the van der Waals parameters $a = 1250 \pm 150$ MeV fm$^3$ and $r = 0.7 \pm 0.05$ fm. Further, a phase transition is observed in this model with the critical point at temperature, $T = 62.1$ MeV and baryon chemical potential, $\mu_B = 708$ MeV.