# American Institute of Mathematical Sciences

July  2009, 8(4): 1351-1371. doi: 10.3934/cpaa.2009.8.1351

## Asymptotic behavior of solutions for some semilinear heat equations in $R^N$

 1 Mathematical Institute, Tohoku University, Aoba, Sendai 980-8578, Japan, Japan

Received  January 2008 Revised  November 2008 Published  March 2009

We consider the Cauchy problem of the semilinear heat equation,

$\partial_t u = \Delta u +f(u)$ in $R^N \times (0,\infty),$

$u (x,0) = \phi (x) \ge 0$ in $R^N,\quad\quad$

where $N \geq 1$, $f \in C^1([0,\infty))$, and $\phi \in L^1(R^N) \cap L^{\infty}(R^N)$. We study the asymptotic behavior of the solutions in the $L^q$ spaces with $q \in [1,\infty]$, by using the relative entropy methods.

Citation: Kazuhiro Ishige, Tatsuki Kawakami. Asymptotic behavior of solutions for some semilinear heat equations in $R^N$. Communications on Pure & Applied Analysis, 2009, 8 (4) : 1351-1371. doi: 10.3934/cpaa.2009.8.1351
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