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arXiv 2209.11206math.AP
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三维Keller-Segel系统稳定奇点的形成

Stable singularity formation for the Keller-Segel system in three dimensions

Irfan Glogić, Birgit Schörkhuber

摘要:

我们考虑了$d \geq 3$维的抛物-椭圆型Keller-Segel系统,这是质量超临界的情形。该系统具有丰富的动力学行为,包括通过自相似解形成奇点。二十多年前,Brenner等人在\cite{BCKSV99}中发现了一个明确的例子,并证明它是非线性径向稳定的。我们证明了$d=3$的这个猜想。我们的方法包括在相似变量中重新表述问题,并通过半群理论的方法研究相交索伯列夫空间中的柯西演化。为了解决潜在的光谱问题,我们非常依赖于我们最近在\cite{GloSch20}中开发的技术。据我们所知,这提供了第一个稳定的自相似爆破的Keller-Segel系统的结果。此外,我们的结果推广到任何更高的维度是直接的。我们指出,我们的方法是通用的和强大的,因此可以应用到广泛的一类抛物型模型。

英文摘要:

We consider the parabolic-elliptic Keller-Segel system in dimensions $d \geq 3$, which is the mass supercritical case. This system is known to exhibit rich dynamical behavior including singularity formation via self-similar solutions. An explicit example has been found more than two decades ago by Brenner et al. \cite{BCKSV99}, and is conjectured to be nonlinearly radially stable. We prove this conjecture for $d=3$. Our approach consists of reformulating the problem in similarity variables and studying the Cauchy evolution in intersection Sobolev spaces via semigroup theory methods. To solve the underlying spectral problem, we crucially rely on a technique we recently developed in \cite{GloSch20}. To our knowledge, this provides the first result on stable self-similar blowup for the Keller-Segel system. Furthermore, the extension of our result to any higher dimension is straightforward. We point out that our approach is general and robust, and can therefore be applied to a wide class of parabolic models.

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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