Abstract
Consider the diffusive Hamilton-Jacobi equation u t = Δu + |∇u|p, p > 2, on a bounded domain Ω with zero-Dirichlet boundary conditions, which arises in the KPZ model of growing interfaces. It is known that u remains bounded and that ∇u may blow up only on the boundary ∂Ω. In this paper, under suitable assumptions on \({\Omega\subset \mathbb{R}^2}\) and on the initial data, we show that the gradient blow-up singularity occurs only at a single point \({x_0\in\partial\Omega}\). This is the first result of this kind in the study of problems involving gradient blow-up phenomena. In general domains of \({\mathbb{R}^n}\), we also obtain results on nondegeneracy and localization of blow-up points.
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Communicated by P. Constantin
Supported in part by National Natural Science Foundation of China 10601012 and Southeast University Award Program for Outstanding Young Teachers 2005.
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Yuxiang, L., Souplet, P. Single-Point Gradient Blow-up on the Boundary for Diffusive Hamilton-Jacobi Equations in Planar Domains. Commun. Math. Phys. 293, 499–517 (2010). https://doi.org/10.1007/s00220-009-0936-8
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DOI: https://doi.org/10.1007/s00220-009-0936-8