Qualitative behavior for flux-saturated mechanisms: Traveling waves,   waiting time and smoothing effects
  This paper is devoted to the analysis of qualitative properties of flux-saturated type operators in dimension one. Specifically, we study regularity properties and smoothing effects, discontinuous interfaces, the existence of traveling wave profiles, sub- and super-solutions and waiting time features. The aim of the paper is to better understand these kind of phenomena throughout two prototypic operators: The relativistic heat equation and the porous media flux-limited equation. As an important consequence of our results we deduce that solutions to the one-dimensional relativistic heat equation become smooth inside their support on the long time run. 
Juan Calvo, Juan Campos, Vicent Caselles, Oscar S\'anchez, Juan Soler
math.AP