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arXiv 1206.1963math.AP
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抛物-椭圆型Keller-Segel模型在平面上的渐近估计

Asymptotic estimates for the parabolic-elliptic Keller-Segel model in the plane

Juan Campos Serrano, Jean Dolbeault

摘要:

研究了自相似变量的二维Keller-Segel系统解的大时间行为,当总质量为亚临界时,即经过适当的无量纲化后,总质量小于小于π.从以前的工作中可以看出,当质量较小时,所有解都以指数速率收敛到稳态解。在这里,我们删除这个限制,并表明,在相对熵测量的收敛速率是指数的任何质量在亚临界范围内,和独立的质量。该证明依赖于对称化技术,该技术改编自J. I. Diaz,T. Nagai和J. - M. Rakotoson,并允许我们建立统一的估计Lp范数的解决方案。指数收敛是通过在一个空间中线性化得到的,该空间定义为与相对熵估计一致,并且线性化的演化算子是自伴的。证明的核心依赖于几个新的光谱间隙估计是独立的利益。

英文摘要:

We investigate the large-time behavior of the solutions of the two-dimensional Keller-Segel system in self-similar variables, when the total mass is subcritical, that is less than 8πafter a proper adimensionalization. It was known from previous works that all solutions converge to stationary solutions, with exponential rate when the mass is small. Here we remove this restriction and show that the rate of convergence measured in relative entropy is exponential for any mass in the subcritical range, and independent of the mass. The proof relies on symmetrization techniques, which are adapted from a paper of J.I. Diaz, T. Nagai, and J.-M. Rakotoson, and allow us to establish uniform estimates for Lp norms of the solution. Exponential convergence is obtained by the mean of a linearization in a space which is defined consistently with relative entropy estimates and in which the linearized evolution operator is self-adjoint. The core of proof relies on several new spectral gap estimates which are of independent interest.

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