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We explore the influence of a temperature-dependent shear viscosity overentropy density ratio $\eta/s$ on the azimuthal anisotropies v_2 and v_4 ofhadrons at various rapidities. We find that in Au+Au collisions at full RHICenergy, $\sqrt{s_{NN}}=200$ GeV, the flow anisotropies are dominated byhadronic viscosity at all rapidities, whereas in Pb+Pb collisions at the LHCenergy, $\sqrt{s_{NN}}=2760$ GeV, the flow coefficients are affected by theviscosity both in the plasma and hadronic phases at midrapidity, but thefurther away from midrapidity, the more dominant the hadronic viscosity is. Wefind that the centrality and rapidity dependence of the elliptic andquadrangular flows can help to distinguish different parametrizations of$(\eta/s)(T)$. We also find that at midrapidity the flow harmonics are almostindependent of the decoupling criterion, but show some sensitivity to thecriterion at back- and forward rapidities.

Influence of temperature dependent shear viscosity on elliptic flow at back- and forward rapidities in ultrarelativistic heavy-ion collisions