Speaker
Description
The shear viscosity of the quark-gluon plasma (QGP) is important ingredient for describing current measurements in heavy-ion collisions and are key inputs to hydrodynamical models. The interest in shear viscosity also lies in the fact that QGP is the most ideal fluid ever observed and has the shear viscosity to entropy ratio ($\eta / s$) close to the theoretical bound $\eta / s \geq 1/ 4 \pi$ in the strong coupling region within AdS/CFT formalism. We utilize the gradient flow method to renormalize the Energy-Momentum Tensor (EMT) and to suppress UV fluctuations in correlators on a lattice SU(3) gauge theory. We take the continuum limit and then the zero flow-time limit to extract shear viscosity in the pure-gauge theory. For spectral reconstruction from lattice correlators, we model the spectral function by combining perturbative UV part with the hydro-motivated infrared part. We also present the extension of quenched findings to full QCD, specifically the renormalization of EMT and determination of relevant coefficients for shear viscosity with $m_s / m_l = 20$ on the lattice.
