Comparison results and steady states for the Fujita equation with fractional Laplacian

Details Comparison results and steady states for the Fujita equation with fractional Laplacian Comparison results and steady states for the Fujita equation with fractional Laplacian

2003-02-28

arxiv.org/abs/math/0302353v1

Mathematics

Analysis of PDEs

17 pages, 2 figures

Scientific paper

We study a semilinear PDE generalizing the Fujita equation whose evolution operator is the sum of a fractional power of the Laplacian and a convex non-linearity. Using the Feynman-Kac representation we prove criteria for asymptotic extinction versus finite time blow up of positive solutions based on comparison with global solutions. For a critical power non-linearity we obtain a two-parameter family of radially symmetric stationary solutions. By extending the method of moving planes to fractional powers of the Laplacian we prove that all positive steady states of the corresponding equation in a finite ball are radially symmetric.

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