Shear Viscosities of Photons in Strongly Coupled Plasmas
arXiv:1507.04232 · doi:10.1016/j.physletb.2016.07.034
Abstract
We investigate the shear viscosity of thermalized photons in the quark gluon plasma (QGP) at weak coupling and super Yang-Mills plasma (SYMP) at both strong and weak couplings. We find that the shear viscosity due to the photon-parton scattering up to the leading order of electromagnetic coupling is suppressed when the coupling of the QGP/SYMP is increased, which stems from the blue-shift of the thermal-photon spectrum at strong coupling. In addition, the shear viscosity rapidly increases near the deconfinement transition in a phenomenological model analogous to the QGP.
7 pages, 5 figures, the title and context are modified, journal version accepted by Physics Letters B
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