The $\eta /s$ of the LQCD-EoS complied hadron gas of different sizes approach common minimum near the crossover temperature

TL;DR

This paper investigates how the shear viscosity to entropy density ratio varies with temperature in finite-sized hadron gases modeled after lattice QCD, revealing a universal minimum near the QCD crossover temperature.

Contribution

It demonstrates that different system sizes of hadron gases exhibit a common minimum in η/s near the QCD crossover temperature, highlighting a universal behavior in the transport properties.

Findings

η/s reaches a minimum near T_c for all system sizes

The minimum value of η/s is approximately universal across sizes

Transport properties show critical behavior near T_c

Abstract

We study the temperature dependence of the ratio of the shear viscosity to entropy density for the LQCD-contrasted hadron resonance gas of different finite system-sizes, which may represent the final state hadronic matter, formed in systems of ultra-relativistic collisions. The transport coefficient reaches the lowest common value, for the systems of different sizes of thermalized hadron gas, near the critical temperature $T_{c}$ of the QCD crossover.