Shock propagation and stability in causal dissipative hydrodynamics
  We studied the shock propagation and its stability with the causal dissipative hydrodynamics in 1+1 dimensional systems. We show that the presence of the usual viscosity is not enough to stabilize the solution. This problem is solved by introducing an additional viscosity which is related to the coarse-graining scale of the theory. 
G.S.Denicol, T. Kodama, T. Koide, and Ph. Mota