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LONG-TIME BEHAVIOR OF SOLUTIONS OF THE FAST DIFFUSION EQUATIONS WITH CRITICAL ABSORPTION TERMS

Published online by Cambridge University Press:  24 April 2006

PEIHU SHI
Affiliation:
Department of Mathematics, Southeast University, Nanjing 210018, People's Republic of Chinasph2106@yahoo.com.cn
MINGXIN WANG
Affiliation:
Department of Mathematics, Xuzhou Normal University, Xuzhou 221116, People's Republic of China and Department of Mathematics, Southeast University, Nanjing 210018, People's Republic of China
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Abstract

This paper is devoted to the long-time behavior of solutions to the Cauchy problem of the porous medium equation $u_t=\Delta(u^m)-u^p$ in $\mathbb{R}^n\times (0,\infty)$ with $(1-2/n)_{+}<m<1$ and the critical exponent $p=m+2/n$. For the strictly positive initial data $u(x,0)=O(1+|x|)^{-k}$ with $n+mn(2-n+nm)/(2[2-m+mn(1-m)])\leq k<2/(1-m)$, we prove that the solution of the above Cauchy problem converges to a fundamental solution of $u_t=\Delta(u^m)$ with an additional logarithmic anomalous decay exponent in time as $t\to \infty$.

Keywords

Type
Notes and Papers
Copyright
The London Mathematical Society 2006

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Footnotes

This work was supported by the National Natural Science Foundation of China 10471022, and the Ministry of Education of China Science and Technology Major Projects Grant 104090.