Loss of boundary conditions for fully nonlinear parabolic equations with superquadratic gradient terms

We study whether the solutions of a fully nonlinear, uniformly parabolic equation with superquadratic
growth in the gradient satisfy initial and homogeneous boundary conditions in the classical sense, a problem we refer to as the classical Dirichlet problem. Our main results are: the nonexistence of global-in-time
solutions of this problem, depending on a specific largeness condition on the initial data, and the existence
of local-in-time solutions for initial data C1 up to the boundary. Global existence is know when boundary conditions are understood in the viscosity sense, what is known as the generalized Dirichlet problem.
Therefore, our result implies loss of boundary conditions in finite time. Specifically, a solution satisfying
homogeneous boundary conditions in the viscosity sense eventually becomes strictly positive at some point
of the boundary.