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arXiv 2111.04792math.AP
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任意维趋化性流体模型的适定性

Well-posedness for chemotaxis-fluid models in arbitrary dimensions

Gael Yomgne Diebou

摘要:

研究了具有趋化性的Navier-斯托克斯方程和Keller-Segel-Navier-Stokes方程组的Cauchy问题。在适当的条件下,对$2$和高维的低正则性数据构造了满足质量守恒和非负性保持等基本性质的局部时间解和全局时间解.我们的初始数据类涉及一个新的规模的函数空间,即$\Y(\rn)$收集发散的向量场与组件在平方Campanato空间$\mathscr{L}_{2,N-2}(\rn)$,$N>2$(并可以确定与齐次Besov空间$\dot{B}^{-1}_{22}(\rn)$时,$N=2$),并被证明是最佳的在一定意义上。在一定的限制条件下,得到了整体解的唯一性准则。

英文摘要:

We study the Cauchy problem for the chemotaxis Navier-Stokes equations and the Keller-Segel-Navier-Stokes system. Local-in-time and global-in-time solutions satisfying fundamental properties such as mass conservation and nonnegativity preservation are constructed for low regularity data in $2$ and higher dimensions under suitable conditions. Our initial data classes involve a new scale of function space, that is $\Y(\rn)$ which collects divergence of vector-fields with components in the square Campanato space $\mathscr{L}_{2,N-2}(\rn)$, $N>2$ (and can be identified with the homogeneous Besov space $\dot{B}^{-1}_{22}(\rn)$ when $N=2$) and are shown to be optimal in a certain sense. Moreover, uniqueness criterion for global solutions is obtained under certain limiting conditions.

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