一类非齐次抛物型方程的适定性和爆破

IF 0.7 Q3 MATHEMATICS, APPLIED
M. Majdoub
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引用次数: 5

摘要

我们考虑非齐次方程$u_t-\Delta u=|x|^\alpha|u|^{p}+\zeta(t)\,{\mathbf w}(x)$在$(0,\infty)\times{\math bb{R}}^N$中的变号解的大时间行为,其中$N\geq3$,$p>1$,$\alpha>-2$,$\zeta,{\ mathbf w}$是连续函数,使得$\ze塔(t)\sim t^\sigma$为$t\到0$,$\ zeta(t)\sim t^m$作为$t\到\infty$。我们得到$\sigma>-1$的局部存在性。我们还展示了以下内容:$-$如果$m\leq0$,$p0$,则所有解都在有限时间内爆炸;$-$如果$m>0$,$p>1$和$\int_{\mathbb{R}^N}{\math bf w}(x)dx>0$,则所有解在有限时间内爆炸。本文的主要新颖之处在于,爆炸取决于$\zeta$在无穷大处的行为。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Well-posedness and blow-up for an inhomogeneous semilinear parabolic equation
We consider the large-time behavior of sign-changing solutions of the inhomogeneous equation $u_t-\Delta u=|x|^\alpha |u|^{p}+\zeta(t)\,{\mathbf w}(x)$ in $(0,\infty)\times{\mathbb{R}}^N$, where $N\geq 3$, $p>1$, $\alpha>-2$, $\zeta, {\mathbf w}$ are continuous functions such that $\zeta(t)\sim t^\sigma$ as $t\to 0$, $\zeta(t)\sim t^m$ as $t\to\infty$ . We obtain local existence for $\sigma>-1$. We also show the following: $-$ If $m\leq 0$, $p 0$, then all solutions blow up in finite time; $-$ If $m> 0$, $p>1$ and $\int_{\mathbb{R}^N}{\mathbf w}(x)dx>0$, then all solutions blow up in finite time. The main novelty in this paper is that blow up depends on the behavior of $\zeta$ at infinity.
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