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

JOURNAL OF DIFFERENTIAL EQUATIONS

卷:264

Article

Quaas, Alexander¹  Rodriguez, Andrei¹ 

[1] Univ Santa Maria, Dept Matemat, Casilla 5-110,Avda Espana 1680, Valparaiso, Chile

关键词: Loss of boundary conditions;    Viscosity solutions;    Gradient blow-up;    Fully nonlinear parabolic equations;    Viscous Hamilton-Jacobi equations;    Nonlinear eigenvalues;   

DOI  :  10.1016/j.jde.2017.11.008

来源: Elsevier

【 摘 要 】

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 C-1 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. (C) 2017 Elsevier Inc. All rights reserved.

【 授权许可】

Free