On the differentiability of the solution to the Hamilton-Jacobi equation with critical fractional diffusion
arXiv:0911.5147
Abstract
We prove that the Hamilton Jacobi equation for an arbitrary Hamiltonian (locally Lipschitz but not necessarily convex) and fractional diffusion of order one (critical) has classical solutions. The proof is achieved using a new Hölder estimate for solutions of advection diffusion equations of order one with bounded vector fields that are not necessarily divergence free.