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arXiv 2303.04094math.DS
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Banach空间中偏泛函微分方程吸引子的拓扑维数

Topological dimensions of attractors for partial functional differential equations in Banach spaces

Wenjie Hu, Tomás Caraballo

AI总结:

本文针对Banach空间中自治与非自治泛函微分方程,提出结合挤压性质与有限子空间覆盖的新判据,估计吸引子的Hausdorff与分形维数,并应用于两类方程获得仅依赖谱和Lipschitz常数的显式维数界。

摘要:

本文的主要目标是估计Banach空间中自治和非自治泛函微分方程(FDEs)的全局吸引子和拉回吸引子的Hausdorff维数以及分形维数。通过结合挤压性质和Banach空间有限子空间的覆盖,首次提出了Banach空间中吸引子有限Hausdorff维数和分形维数的新判据,推广了在Hilbert空间中建立的方法。为了克服缺乏有限秩正交投影(这是证明Hilbert空间中偏微分方程挤压性质的关键工具)所造成的障碍,我们采用基于所研究FDEs的指数二分性的相空间状态分解来获得类似的挤压性质。理论结果应用于自然相空间中的滞后非线性反应扩散方程和非自治滞后泛函微分方程,获得了不依赖于熵数而仅依赖于线性部分谱和非线性部分Lipschitz常数的维数显式界。

英文摘要:

The main objective of this paper is to obtain estimations of Hausdorff dimension as well as fractal dimension of global attractors and pullback attractors for both autonomous and nonautonomous functional differential equations (FDEs) in Banach spaces. New criterions for the finite Hausdorff dimension and fractal dimension of attractors in Banach spaces are firslty proposed by combining the squeezing property and the covering of finite subspace of Banach spaces, which generalize the method established in Hilbert spaces. In order to surmount the barrier caused by the lack of orthogonal projectors with finite rank, which is the key tool for proving the squeezing property of partial differential equations in Hilbert spaces, we adopt the state decomposition of phase space based on the exponential dichotomy of the studied FDEs to obtain similar squeezing property. The theoretical results are applied to a retarded nonlinear reaction-diffusion equation and a non-autonomous retarded functional differential equation in the natural phase space, for which explicit bounds of dimensions that do not depend on the entropy number but only depend on the spectrum of the linear parts and Lipschitz constants of the nonlinear parts are obtained.

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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