# Temperature Effect on Shear and Bulk Viscosities of QCD Matter

## TL;DR

This paper explores how shear and bulk viscosities of QCD matter change with temperature, using advanced theoretical methods to calculate related properties like pion mass, decay constant, and thermal width.

## Contribution

It introduces a novel analysis of the temperature dependence of viscosities in QCD matter using Dyson-Schwinger and Roy equations, highlighting new features of bulk viscosity behavior.

## Key findings

- Viscosities vary significantly with temperature.
- Bulk viscosity exhibits a unique temperature-dependent feature.
- The study provides detailed behavior of pion properties at finite temperature.

## Abstract

We investigate the temperature dependence of the shear and bulk viscosities and their ratios to the entropy density via a continuum QCD approach. We calculate the pion mass and decay constant in the framework of Dyson-Schwinger equations of QCD and the pion thermal width by combining with Roy equations. We obtain then the variation behaviors of the viscosities, especially a novel feature of the bulk viscosity, with respect to temperature.