A gas of hard spheres expanding in Bjorken flow has a constant Knudsen number, which yields an exact analytical hydrodynamic attractor and the first convergent gradient expansion in an expanding relativistic system.
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Exact hydrodynamic attractor of an ultrarelativistic gas of hard spheres
A gas of hard spheres expanding in Bjorken flow has a constant Knudsen number, which yields an exact analytical hydrodynamic attractor and the first convergent gradient expansion in an expanding relativistic system.