  There is mounting evidence suggesting that relativistic hydrodynamics becomes
relevant for the physics of quark-gluon plasma as the result of nonhydrodynamic
modes decaying to an attractor apparent even when the system is far from local
equilibrium. Here we determine this attractor for Bjorken flow in N=4
supersymmetric Yang-Mills theory using Borel summation of the gradient
expansion of the expectation value of the energy momentum tensor. By comparing
the result to numerical simulations of the flow based on the AdS/CFT
correspondence we show that it provides an accurate and unambiguous
approximation of the hydrodynamic attractor in this system. This development
has important implications for the formulation of effective theories of
hydrodynamics.

High Energy Physics - Theory;High Energy Physics - Phenomenology;Nuclear Theory