Transport coefficients of hot and dense hadron gas in a magnetic field: a relaxation time approach

TL;DR

This paper calculates the thermal, electrical, and shear viscosity transport coefficients of hot, dense hadronic matter under magnetic fields using a relaxation time approach, revealing anisotropic effects and dependencies on temperature and chemical potential.

Contribution

It introduces a relaxation time method to estimate anisotropic transport coefficients of hadronic matter in magnetic fields within the hadron resonance gas model.

Findings

Transport coefficients are anisotropic in magnetic fields.

Perpendicular transport coefficients are smaller than isotropic values.

Transport coefficients depend on temperature and baryon chemical potential.

Abstract

We estimate various transport coefficients of hot and dense hadronic matter in the presence of magnetic field. The estimation is done through solutions of the relativistic Boltzmann transport equation in the relaxation time approximation.We have investigated the temperature and the baryon chemical potential dependence of these transport coefficients. Explicit calculations are done for the hadronic matter in the ambit of hadron resonance gas model. We estimate thermal conductivity, electrical conductivity and the shear viscosity of hadronic matter in the presence of a uniform magnetic field. Magnetic field, in general, makes the transport coefficients anisotropic. It is also observed that all the transport coefficients perpendicular to the magnetic field are smaller compared to their isotropic counterpart.