Fractional diffusion limit of a linear kinetic equation in a bounded   domain
  A version of fractional diffusion on bounded domains, subject to 'homogeneous Dirichlet boundary conditions' is derived from a kinetic transport model with homogeneous inflow boundary conditions. For nonconvex domains, the result differs from standard formulations. It can be interpreted as the forward Kolmogorow equation of a stochastic process with jumps along straight lines, remaining inside the domain. 
Pedro Aceves-Sanchez, Christian Schmeiser
math.AP