The effect of shear and bulk viscosities on elliptic flow

In this work, we examine the effect of shear and bulk viscosities on elliptic flow by taking a realistic parameterization of the shear and bulk viscous coefficients,. and., and their respective relaxation times, tau(pi) and tau(Pi). We argue that the behaviors close to an ideal fluid observed at RHIC energies may be related to the non-trivial temperature dependence of these transport coefficients.