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arXiv 2005.02734math.AP
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具有局部感觉的趋化性模型的时滞爆破

Delayed Blow-Up for Chemotaxis Models with Local Sensing

Martin Burger, Philippe Laurençot, Ariane Trescases

摘要:

本文的目的是分析一个模型的趋化性的基础上的局部传感机制,而不是梯度传感机制中使用的著名的最小Keller-Segel模型。我们研究的模型与最小Keller-Segel模型具有相同的熵,但不同的动力学来最小化这个熵。因此,对于稳定的解决方案或爆破存在的质量的条件是相同的,但我们做了有趣的观察,局部传感机制的情况下,超临界质量的爆破延迟到无限的时间。通过证明任意大质量和空间维数下的整体弱解的存在性,我们的观察从数学角度得到了严格的证明。我们的模型与最小Keller-Segel模型的关键区别在于,方程的结构允许对偶估计,这意味着解的$(H^1)'$ -范数上的界,它只能随时间的平方根律增长。这个额外的$(H^1)'$ -边界意味着熵的下界,这与最小Keller-Segel模型形成鲜明对比,在超临界情况下,它是从下面无界的。此外,还研究了解的正则性和唯一性。

英文摘要:

The aim of this paper is to analyze a model for chemotaxis based on a local sensing mechanism instead of the gradient sensing mechanism used in the celebrated minimal Keller-Segel model. The model we study has the same entropy as the minimal Keller-Segel model, but a different dynamics to minimize this entropy. Consequently, the conditions on the mass for the existence of stationary solutions or blow-up are the same, however we make the interesting observation that with the local sensing mechanism the blow-up in the case of supercritical mass is delayed to infinite time. Our observation is made rigorous from a mathematical point via a proof of global existence of weak solutions for arbitrary large masses and space dimension. The key difference of our model to the minimal Keller-Segel model is that the structure of the equation allows for a duality estimate that implies a bound on the $(H^1)'$-norm of the solutions, which can only grow with a square-root law in time. This additional $(H^1)'$-bound implies a lower bound on the entropy, which contrasts markedly with the minimal Keller-Segel model for which it is unbounded from below in the supercritical case. Besides, regularity and uniqueness of solutions are also studied.

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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