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arXiv 1902.04286math.AP
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Boltzmann和Landau方程解的Fisher信息的一致估计

Uniform estimates on the Fisher information for solutions to Boltzmann and Landau equations

Ricardo J. Alonso, Véronique Bagland, Bertrand Lods

摘要:

本文证明了在初始数据的某些最小正则性假设下,空间齐次硬势Boltzmann和Landau方程的解均匀传播Fisher信息.这个结果的证明是基于Boltzmann方程解的显式逐点下界和Landau方程的强扩散性质。我们包括一个应用程序的解决方案的梯度指数尾的出现和传播有关的结果。这些结果补充了文献中提供的估计数。

英文摘要:

In this note we prove that, under some minimal regularity assumptions on the initial datum, solutions to the spatially homogenous Boltzmann and Landau equations for hard potentials uniformly propagate the Fisher information. The proof of such a result is based upon some explicit pointwise lower bound on solutions to Boltzmann equation and strong diffusion properties for the Landau equation. We include an application of this result related to emergence and propagation of exponential tails for the solution's gradient. These results complement estimates provided in the literature.

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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