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arXiv 2410.09035math.AP
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Landau方程Fisher信息的耗散估计

Dissipation estimates of the Fisher information for the Landau equation

Sehyun Ji

AI总结:

针对具有极软势的空间齐次Landau方程,本文建立了Fisher信息耗散的先验估计,并以此证明了Fisher信息的瞬时有界性及光滑解的全局存在性。

摘要:

我们针对具有极软势的空间齐次Landau方程,建立了Fisher信息耗散的先验估计。本研究受Guillen和Silvestre近期突破的启发,该突破证明了Fisher信息单调递减。作为直接推论,我们证明Fisher信息会瞬间有界,即使初始时无界。在给定初始数据 $f_0 \in L^1_{2-γ} \cap L \log L$ 的情况下,这导出了具有极软势的空间齐次Landau方程光滑解全局存在性的证明。该结果包含Coulomb势的情况。

英文摘要:

We establish an a priori estimate for the dissipation of the Fisher information for the space-homogeneous Landau equation with very soft potentials. This work is motivated by the recent breakthrough by Guillen and Silvestre, which proves that the Fisher information is monotone decreasing. As a direct consequence, we show that the Fisher information becomes instantaneously bounded, even if it is not initially bounded. This leads to a proof of the global existence of smooth solutions for the space-homogeneous Landau equation with very soft potentials, given initial data $f_0 \in L^1_{2-γ} \cap L \log L$. This result includes the case of the Coulomb potential.

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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