Viscosity Effects in Hydrodynamics via AdS/CFT

Abstract
We consider holographic descriptions of Bjorken expansion of strongly coupled large-$N_{c}$ ${cal N}=4$ SYM fluid in the presence of shear viscosity. We find that the requirement of the regularity of the dual geometry makes a constraint on the time dependence of the shear viscosity. The constraint is consistent with the time evolution of the shear viscosity obtained by its temperature dependence.
Keywords: RHIC, AdS/CFT, Bjorken expansion, Hydrodynamics

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