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arXiv math/0611496math.APnlin.AOq-bio.QM
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分数阶Keller-Segel模型

The fractional Keller-Segel model

Carlos Escudero

摘要:

Keller-Segel模型是模拟细胞系统中的趋化聚集的偏微分方程系统。这个模型在d ≥ 2的维度上有足够大的初始条件的解,但所有的解在一维上都是正则的;这是一个数学事实,对生物系统中可能形成的模式有着至关重要的影响。Keller-Segel模型的最强假设之一是细胞运动的扩散特性,已知在许多情况下是错误的。我们将此模型扩展到这样的情况下,其中的细胞扩散是更好地模拟分数算子。我们分析了这个分数阶Keller-Segel模型,发现所有的解在一维时间上又是全局有界的。这一事实表明了从Keller-Segel模型获得的主要生物学结论的稳健性。

英文摘要:

The Keller-Segel model is a system of partial differential equations modelling chemotactic aggregation in cellular systems. This model has blowing up solutions for large enough initial conditions in dimensions d >= 2, but all the solutions are regular in one dimension; a mathematical fact that crucially affects the patterns that can form in the biological system. One of the strongest assumptions of the Keller-Segel model is the diffusive character of the cellular motion, known to be false in many situations. We extend this model to such situations in which the cellular dispersal is better modelled by a fractional operator. We analyze this fractional Keller-Segel model and find that all solutions are again globally bounded in time in one dimension. This fact shows the robustness of the main biological conclusions obtained from the Keller-Segel model.

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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