Temperature effect on shear and bulk viscosities of QCD matter

Fei Gao, Yu Xin Liu

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

With developing a scheme to determine the thermal width of a pion in a medium, we investigate the shear and bulk viscosities and their ratios to entropy density. We calculate the temperature (T)-dependence of the pion mass and decay constant via the Dyson-Schwinger equations of QCD and get the pion thermal width with the QCD approach. We obtain then the T-dependence of the viscosities, especially a novel feature of the bulk viscosity, via the continuum QCD approach. The novel concavo-convex behavior of the bulk viscosity to entropy density ratio against the temperature is a demonstration of the QCD phase transitions.

Original languageEnglish
Article number054026
JournalPhysical Review D
Volume97
Issue number5
DOIs
Publication statusPublished - 1 Mar 2018
Externally publishedYes

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