Abstract
In this article, the authors establish conditions for the extinction of solutions, in finite time, of the fast diffusion equation \({u_t=\Delta u^m+a\int_\Omega u^p(y,t)\,{d}y,\ 0 < m < 1,}\) in a bounded domain \({\Omega\subset R^N}\) with N > 2. More precisely speaking, it is shown that if p > m, any solution with small initial data vanishes in finite time, and if p < m, the maximal solution is positive in Ω for all t > 0. For the critical case p = m, whether the solutions vanish in finite time or not depends on the value of aμ, where \({\mu=\int_{\Omega}\varphi(x)\,{d}x}\) and \({\varphi}\) is the unique positive solution of the elliptic problem \({-\Delta\varphi(x)=1,\ x\in \Omega; \varphi(x)=0,\ x\in\partial\Omega}\) .
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The project is supported by Key Lab of Symbolic Computation and Knowledge Engineering of Ministry of Education, by the 985 program of Jilin University and by Graduate Innovation Fund of Jilin University (20111034).
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Han, Y., Gao, W. Extinction for a fast diffusion equation with a nonlinear nonlocal source. Arch. Math. 97, 353–363 (2011). https://doi.org/10.1007/s00013-011-0299-1
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DOI: https://doi.org/10.1007/s00013-011-0299-1