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arXiv 2207.03497math.AP
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具有不规则初值的Boltzmann方程的经典解

Classical solutions of the Boltzmann equation with irregular initial data

Christopher Henderson, Stanley Snelson, Andrei Tarfulea

AI总结:

针对非截断Boltzmann方程,在弱正则初值下构造大初值经典解,并证明弱-强唯一性及平衡态附近全局存在性。

摘要:

本文研究空间非齐次、非截断的Boltzmann方程。我们针对有界可测且速度变量具有温和阶一致多项式衰减的初值,构造了大初值经典解。我们的结果不要求初值严格为正,除非在相空间中某个小球内局部成立。当放宽初值的衰减和正性假设时,我们还获得了弱解的存在性结果。由于解的正则性可能随$t \ ightarrow 0$退化,唯一性是一个具有挑战性的问题。我们在初值无真空区域且Hölder连续的额外假设下,建立了弱-强唯一性。作为我们短时间存在定理的一个应用,我们证明了在速度上以有限多项式速率衰减的有界可测初值在平衡态附近的全局存在性。

英文摘要:

This article considers the spatially inhomogeneous, non-cutoff Boltzmann equation. We construct a large-data classical solution given bounded, measurable initial data with uniform polynomial decay of mild order in the velocity variable. Our result requires no assumption of strict positivity for the initial data, except locally in some small ball in phase space. We also obtain existence results for weak solutions when our decay and positivity assumptions for the initial data are relaxed. Because the regularity of our solutions may degenerate as $t \rightarrow 0$, uniqueness is a challenging issue. We establish weak-strong uniqueness under the additional assumption that the initial data possesses no vacuum regions and is Hölder continuous. As an application of our short-time existence theorem, we prove global existence near equilibrium for bounded, measurable initial data that decays at a finite polynomial rate in velocity.

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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