Loss of boundary conditions for fully nonlinear parabolic equations with superquadratic gradient terms |
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Authors: | Alexander Quaas Andrei Rodríguez |
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Affiliation: | Departamento de Matemática, Universidad Técnica Federico Santa María, Casilla: V-110, Avda. España 1680, Valparaíso, Chile |
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Abstract: | 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 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. |
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Keywords: | 35D40 35K55 35K20 35P30 Loss of boundary conditions Viscosity solutions Gradient blow-up Fully nonlinear parabolic equations Viscous Hamilton–Jacobi equations Nonlinear eigenvalues |
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