Radial symmetry of solutions to diffusion equations with discontinuous nonlinearities

Joaquim Serra

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arXiv · 1101.5094

Radial symmetry of solutions to diffusion equations with discontinuous nonlinearities

Joaquim Serra

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Abstract

We prove a radial symmetry result for bounded nonnegative solutions to the $p$-Laplacian semilinear equation $-\Delta_p u=f(u)$ posed in a ball of $\mathbb R^n$ and involving discontinuous nonlinearities $f$. When $p=2$ we obtain a new result which holds in every dimension $n$ for certain positive discontinuous $f$. When $p\ge n$ we prove radial symmetry for every locally bounded nonnegative $f$. Our approach is an extension of a method of P. L. Lions for the case $p=n=2$. It leads to radial symmetry combining the isoperimetric inequality and the Pohozaev identity.

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Joaquim Serra. 2011-01-26. Radial symmetry of solutions to diffusion equations with discontinuous nonlinearities. https://arxiv.org/abs/1101.5094

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