Long-time extinction of solutions of some semilinear parabolic equations Article - 2007

Yves Belaud, Andrey Shishkov

Yves Belaud, Andrey Shishkov, « Long-time extinction of solutions of some semilinear parabolic equations  », Journal of Differential Equations, 2007, pp. 64–86. ISSN 0022-0396

Abstract

We study the long-time behavior of solutions of semilinear parabolic equation of the following type ∂t u − ∆u + a0(x)u^q = 0 where a0(x) ≥ d0 exp(− [ω(|x|)]/|x|2 ), d0 > 0, 1 > q > 0, and ω is a positive continuousradial function. We give a Dini-like condition on the function ω by two different methods which implies that any solution of the above equation vanishes in a finite time. The first one is a variant of a local energy method and the second one is derived from semi-classical limits of some Schrödinger operators.

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