Analysis of the loss of boundary conditions for the diffusive Hamilton–Jacobi equation

Porretta, Alessio; Souplet, Philippe

Annales de l'I.H.P. Analyse non linéaire, Tome 34 (2017) no. 7, pp. 1913-1923.

We consider the diffusive Hamilton–Jacobi equation, with superquadratic Hamiltonian, homogeneous Dirichlet conditions and regular initial data. It is known from [4] (Barles–DaLio, 2004) that the problem admits a unique, continuous, global viscosity solution, which extends the classical solution in case gradient blowup occurs. We study the question of the possible loss of boundary conditions after gradient blowup, which seems to have remained an open problem till now.

Our results show that the issue strongly depends on the initial data and reveal a rather rich variety of phenomena. For any smooth bounded domain, we construct initial data such that the loss of boundary conditions occurs everywhere on the boundary, as well as initial data for which no loss of boundary conditions occurs in spite of gradient blowup. Actually, we show that the latter possibility is rather exceptional. More generally, we show that the set of the points where boundary conditions are lost, can be prescribed to be arbitrarily close to any given open subset of the boundary.

Mots clés : Diffusive Hamilton–Jacobi equation, Viscosity solution, Gradient blow-up, Loss of boundary conditions

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