Journal or Book Title
Journal of High Energy Physics
Kubo's formula relates bulk viscosity to the retarded Green's function of the trace of the energy-momentum tensor. Using low energy theorems of QCD for the latter we derive the formula which relates the bulk viscosity to the energy density and pressure of hot matter. We then employ the available lattice QCD data to extract the bulk viscosity as a function of temperature. We find that close to the deconfinement temperature bulk viscosity becomes large, with viscosity-to-entropy ratio ζ/s ∼ 1.
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Kharzeev, Dmitri and Tuchin, Kirill, "Bulk viscosity of QCD matter near the critical temperature" (2008). Physics and Astronomy Publications. 134.