Estimates for the transport coefficients of the quark gluon plasma produce in Au+Au collisions at RHIC

There is now compelling evidence that the quark gluon plasma (QGP) is produced in a rapid crossover phase transition in heavy ion collisions at the Relativistic Heavy Ion Collider (RHIC). However, the properties of the QGP still require more detailed study. I will present state-of-the-art scaling techniques which provide important constraints for estimates of the sound speed ($c_s$), mean free path ($\lambda$), viscosity ($\eta/s$) and stopping power ($\hat{q}$). I will also discuss their implication for the coupling strength of the plasma.