Quark number susceptibility of high temperature and finite density QCD

TL;DR

This paper uses lattice simulations and analytic continuation to study quark number susceptibility in high-temperature and finite-density QCD, bridging perturbative and lattice results for better understanding of QCD thermodynamics.

Contribution

It introduces a combined lattice and analytic continuation approach to accurately determine quark number susceptibility across a range of temperatures and densities in QCD.

Findings

Results agree with perturbative expansion at very high temperatures

Extrapolation matches lower temperature lattice data

Provides insights into QCD behavior at finite density

Abstract

We utilize lattice simulations of the dimensionally reduced effective field theory (EQCD) to determine the quark number susceptibility of QCD at high temperature ($T>2T_c$). We also use analytic continuation to obtain results at finite density. The results extrapolate well from known perturbative expansion (accurate in extremely high temperatures) to 4d lower temperature lattice data