We study the large-time behaviour of the solutions u of the evolution equation involving nonlinear diffusion and gradient absorption
We consider the problem posed for \(x \in \mathbb R^N \) and t > 0 with non-negative and compactly supported initial data. We take the exponent p > 2 which corresponds to slow p-Laplacian diffusion, and the exponent q in the superlinear range 1 < q < p − 1. In this range the influence of the Hamilton–Jacobi term \( \vert\nabla u\vert^q\) is determinant, and gives rise to the phenomenon of localization. The large-time behaviour is described in terms of a suitable self-similar solution that solves a Hamilton–Jacobi equation. The shape of the corresponding spatial pattern is rather conical instead of bell-shaped or parabolic.
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Laurençot, P., Vázquez, J.L. Localized Non-diffusive Asymptotic Patterns for Nonlinear Parabolic Equations with Gradient Absorption. J Dyn Diff Equat 19, 985–1005 (2007). https://doi.org/10.1007/s10884-007-9093-y
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DOI: https://doi.org/10.1007/s10884-007-9093-y
Keywords
- Nonlinear parabolic equations
- p-Laplacian equation
- asymptotic patterns
- localization
- Hamilton–Jacobi equations
- viscosity solutions