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arXiv 0906.4538math.AP
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具有分数扩散的一维Keller-Segel模型

The one-dimensional Keller-Segel model with fractional diffusion of cells

Nikolaos Bournaveas, Vincent Calvez

摘要:

研究了一维Keller-Segel模型中的扩散被一个非局部算子所代替,即指数为$0<α\leq 2$的分数阶扩散.我们证明了经典的二维Keller-Segel系统的一些特征:爆破可能会发生,也可能不会发生,这取决于初始数据。更确切地说,当$α<1$和细胞的初始构型充分集中时,在有限时间内出现奇点。相反,如果初始密度在$L^{1/α}$范数意义下足够小,则$α\leq1$的全局存在性成立。

英文摘要:

We investigate the one-dimensional Keller-Segel model where the diffusion is replaced by a non-local operator, namely the fractional diffusion with exponent $0<α\leq 2$. We prove some features related to the classical two-dimensional Keller-Segel system: blow-up may or may not occur depending on the initial data. More precisely a singularity appears in finite time when $α<1$ and the initial configuration of cells is sufficiently concentrated. On the opposite, global existence holds true for $α\leq1$ if the initial density is small enough in the sense of the $L^{1/α}$ norm.

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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