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arXiv 1210.4497math.AP
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任意空间维具有临界质量的半线性抛物-椭圆趋化系统

A semilinear parabolic-elliptic chemotaxis system with critical mass in any space dimension

Alexandre Montaru

摘要:

研究具有临界幂非线性灵敏度的半线性抛物椭圆Patlak-Keller-Segel系统在$\mathbb{R}^N$球中的径向解。对于$N = 2$,后者简化为经典的线性模型,众所周知的临界质量$8π$。我们发现,临界质量现象也发生$N \geq 3$,但具有强烈不同的定性行为。更准确地说,如果细胞的总质量小于或等于临界质量M,那么随着时间的推移,细胞密度会收敛到一个规则的稳定状态,并且严格地在球内部进行支撑。在临界质量的情况下,这个结果是不平凡的,因为存在一个连续的固定的解决方案,而且是在鲜明的对比的情况下,$N = 2$无限时间爆破发生。如果细胞的总质量大于M,则所有解在有限时间内爆破。这实际上是因为存在一个自相似的、在球内部有严格支持的爆破解族(与$N = 2$不同)。

英文摘要:

We study radial solutions in a ball of $\mathbb{R}^N$ of a semilinear, parabolic-elliptic Patlak-Keller-Segel system with a nonlinear sensitivity involving a critical power. For $N = 2$, the latter reduces to the classical linear model, well-known for its critical mass $8π$. We show that a critical mass phenomenon also occurs for $N \geq 3$, but with a strongly different qualitative behaviour. More precisely, if the total mass of cells is smaller or equal to the critical mass M, then the cell density converges to a regular steady state with support strictly inside the ball as time goes to infinity. In the case of the critical mass, this result is nontrivial since there exists a continuum of stationary solutions and is moreover in sharp contrast with the case $N = 2$ where infinite time blow-up occurs. If the total mass of cells is larger than M, then all solutions blow up in finite time. This actually follows from the existence (unlike for $N = 2$) of a family of self-similar, blowing up solutions with support strictly inside the ball.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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