A quasi-particle description of $(2+1)$- flavor lattice QCD equation of state

TL;DR

This paper employs a quasi-particle model to accurately describe the equation of state of (2+1)-flavor lattice QCD, revealing non-trivial dispersion relations and providing insights into interactions, screening, and thermodynamics of quark-gluon plasma.

Contribution

The study introduces an exact mapping of lattice QCD interactions to effective fugacities, leading to a novel quasi-particle description with non-trivial dispersion relations.

Findings

Exact mapping of interactions to effective fugacities.

Derived non-trivial dispersion relations for quasi-partons.

Analyzed Debye screening and trace anomaly in QGP.

Abstract

A quasi-particle model has been employed to describe the $(2+1)$-flavor lattice QCD equation of state with physical quark masses. The interaction part of the equation of state has been mapped to the effective fugacities of otherwise non-interacting quasi-gluons and quasi-quarks. The mapping is found to be exact for the equation of state. The model leads to non-trivial dispersion relations for quasi-partons. The dispersion relations, effective quasi-particle number densities, and trace anomaly have been investigated employing the model.A Virial expansion for the EOS has further been obtained to investigate the role of interactions in quark-gluon plasma (QGP). Finally, Debye screening in QGP has been studied employing the model.