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arXiv 1009.2674math.AP
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凝聚方程和退化扩散Patlak-Keller-Segel模型的局部和整体适定性

Local and Global Well-Posedness for Aggregation Equations and Patlak-Keller-Segel Models with Degenerate Diffusion

Jacob Bedrossian, Nancy Rodríguez, Andrea Bertozzi

摘要:

近年来,具有退化扩散的聚集方程和Patlak-Keller-Segel(PKS)模型的研究引起了人们的广泛兴趣。本文的重点是统一和推广这些模型的适定性理论。我们证明了局部适定性有界域的尺寸$d\geq 2$和在所有的空间$d\geq 3$,唯一性是一个结果以前不知道PKS退化扩散。我们推广了PKS的临界性概念,并证明了次临界问题是全局适定性的。对于相当一般的一类问题,我们证明了存在一个临界质量,急剧划分有限时间爆破和整体存在的可能性。此外,我们计算的临界质量完全一般的问题,并表明具有较小的质量的解决方案存在的全球。对于一类超临界问题,我们证明了对于任意质量的初始数据,有限时间爆破是可能的。

英文摘要:

Recently, there has been a wide interest in the study of aggregation equations and Patlak-Keller-Segel (PKS) models for chemotaxis with degenerate diffusion. The focus of this paper is the unification and generalization of the well-posedness theory of these models. We prove local well-posedness on bounded domains for dimensions $d\geq 2$ and in all of space for $d\geq 3$, the uniqueness being a result previously not known for PKS with degenerate diffusion. We generalize the notion of criticality for PKS and show that subcritical problems are globally well-posed. For a fairly general class of problems, we prove the existence of a critical mass which sharply divides the possibility of finite time blow up and global existence. Moreover, we compute the critical mass for fully general problems and show that solutions with smaller mass exists globally. For a class of supercritical problems we prove finite time blow up is possible for initial data of arbitrary mass.

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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