Shear viscosity of hadronic gas mixtures

TL;DR

This paper studies how baryon chemical potential influences the shear viscosity and the ratio of shear viscosity to entropy density in a pion-nucleon gas mixture, revealing temperature and chemical potential dependencies.

Contribution

It provides new insights into the behavior of shear viscosity and /s in hadronic gases under varying temperature and chemical potential conditions.

Findings

 increases with temperature and chemical potential

/_s decreases over a wide T- plane region

Minimum /_s value is about 0.3

Abstract

We investigate the effects of baryon chemical potential \mu on the shear viscosity coefficient \eta and the viscosity to entropy density ratio \eta/s of a pion-nucleon gas mixture. We find that \eta is an increasing function of T and \mu, while the ratio \eta/s turns to a decreasing function in a wide region of T-\mu plane. In the kinematical region we studied, the smallest value of \eta/s is about 0.3.