Fluid dynamics of out of equilibrium boost invariant plasmas

Abstract

We establish a set of equations for moments of the distribution function. In the relaxation time approximations, these moments obey a coupled set of equations that can be truncated order-by-order. Solving the equations of moments, we are able to identify an attractor solution that controls a transition from a free streaming fixed point to a hydrodynamic fixed point. In particular, this attractor solution provides a renormalization of the effective value of the shear viscosity to entropy density ratio, $\eta /s$, taking into account off-equilibrium effects.

Comments: 2 figures and 4 pages; Proceedings of the 27th international conference on ultra-relativistic nucleus-nucleus collisions (Quark Matter 2018)