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Finite time blow-up for the inhomogeneous equation
Authors:Ross G. Pinsky
Affiliation:Department of Mathematics, Technion-Israel Institute of Technology, Haifa, 32000, Israel
Abstract:We consider the inhomogeneous equation

begin{equation*}begin{split} & u_{t}=Delta u+a(x)u^{p}+lambda phi (x) text{in} R^{d}, tin (0,T), &u(x,0)=f(x),end{split}end{equation*}

where $a,phi gneqq 0$, $lambda >0$ and $fge 0$, and give criteria on $p,d,a$, and $phi $ which determine whether for all $lambda $ and all $f$ the solution blows up in finite time or whether for $lambda $ and $f$ sufficiently small, the solution exists for all time.

Keywords:Finite time blow-up   semilinear reaction-diffusion equations   critical exponent
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