Equal diffusions and zero Dirichlet boundary conditions can induce blow-up

Pavol Quittner; Philippe Souplet

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arXiv · 2610.38542

Equal diffusions and zero Dirichlet boundary conditions can induce blow-up

Pavol Quittner·Philippe Souplet

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Abstract

For a class of systems of two parabolic equations with equal diffusion and homogeneous Dirichlet boundary conditions, we show the existence of finite time blow-up solutions, although the corresponding system of ODE's has only global, exponentially decaying solutions. Such a phenomenon of blow-up induced by equal diffusions, which originates in the works of Bebernes-Lacey [SIAM J. Math. Anal. 21 (1990), 1415--1425, and J. Differential Equations 95 (1992), 105--129] and Weinberger [J. Differ. Equations 154 (1999), 225--237], was previously known, for instance, in the case of homogeneous Neumann boundary conditions, but it had remained an open question whether it can happen in the homogeneous Dirichlet case. The latter, which corresponds to an absorption or cooling of the system at the boundary, that is a priori more stabilizing, requires nontrivial new ideas. As another new feature, we show that this can happen even if the nonlinearity acts only on a compact sub-region, and our proof actually covers the Neumann and Cauchy, as well as Dirichlet problems in a unified way.

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Pavol Quittner, Philippe Souplet. 2026-10-28. Equal diffusions and zero Dirichlet boundary conditions can induce blow-up. https://arxiv.org/abs/2610.38542

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