Journal
PHYSICAL REVIEW D
Volume 84, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.84.025006
Keywords
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Funding
- Natural Sciences and Engineering Research Council of Canada
- Helmholtz International Center for FAIR
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Hydrodynamics predicts long-lived sound and shear waves. Thermal fluctuations in these waves can lead to the diffusion of momentum density, contributing to the shear viscosity and other transport coefficients. Within viscous hydrodynamics in 3 + 1 dimensions, this leads to a positive contribution to the shear viscosity, which is finite but inversely proportional to the microscopic shear viscosity. Therefore the effective infrared viscosity is bounded from below. The contribution to the second-order transport coefficient tau(pi) is divergent, which means that second-order relativistic viscous hydrodynamics is inconsistent below some frequency scale. We estimate the importance of each effect for the quark-gluon plasma, finding them to be minor if eta/s 0.16 but important if eta/s = 0.08.
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