Stable manifolds for a class of degenerate evolution equations and   exponential decay of kinetic shocks
  We construct stable manifolds for a class of degenerate evolution equations including the steady Boltzmann equation, establishing in the process exponential decay of associated kinetic shock and boundary layers to their limiting equilibrium states. Our analysis is from a classical dynamical systems point of view, but with a number of interesting modifications to accomodate ill-posedness with respect to the Cauchy problem of the underlying evolution equation. 
Alin Pogan and Kevin Zumbrun
math.DS