Bulk viscosity of QCD matter near the critical temperature

By D. Kharzeev, K. Tuchin. 2007

177 citations recorded by the source corpus.

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.

Subfields: Nuclear and High Energy Physics, Physical and Theoretical Chemistry

View Paper: https://www.semanticscholar.org/paper/8ae71fbf240b5cd609b74dc4533627daa0daf5e8

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Citations in the corpus

Improved Holographic QCD (2010, methodology): “So far there have been two approaches that have calculated the bulk viscosity in YM/QCD, [29, 30, 31, 32] and have both indicated that the bulk viscosity rises near the phase transition as naive expectation would suggest.”
Bulk viscosity of strongly coupled plasmas with holographic duals (2008, background): “Recent interest has attached to the possibility of a dramatic rise in the bulk viscosity ζ near the cross-over temperature Tc of QCD where confinement and chiral symmetry breaking set in [2, 3].”
Transport properties of the quark-gluon plasma (2011, background): “ spectral function of the operator O⋆ (192), which is smooth at the origin. Using Eq. (193), one ﬁnds 2 Z ∞ 0 dω ω [ρ⋆(ω,T)−ρ⋆(ω,0)] = 3(1−3c2 s)(e+p)−4(e−3p). (194) Eq. (185) was already obtained in [95], but the presence of the ωδ(ω) term in ρθ was missed. In [57], a ﬁnite spatial momentum k was u”