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arXiv 1805.02151math.AP
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线性化Boltzmann碰撞算符从角截断到非截断的渐近分析

Asymptotic analysis of the linearized Boltzmann collision operator from angular cutoff to non-cutoff

Ling-Bing He, Yu-Long Zhou

摘要:

给出了线性化玻尔兹曼碰撞算符及其方程从角截断到非角截断的渐近性的定量估计。一方面,结果揭示了由格拉德截断假设产生的双曲性质和由长程相互作用产生的光滑性质之间的联系。另一方面,借助相空间中的局部化技术,我们观察到了渐近极限过程中的一些新现象。因此,对于中等软势,有截断的碰撞算符不具有谱隙,而无截断的碰撞算符具有谱隙的性质,我们给出了肯定的回答.

英文摘要:

We give quantitative estimates on the asymptotics of the linearized Boltzmann collision operator and its associated equation from angular cutoff to non cutoff. On one hand, the results disclose the link between the hyperbolic property resulting from the Grad's cutoff assumption and the smoothing property due to the long-range interaction. On the other hand, with the help of the localization techniques in the phase space, we observe some new phenomenon in the asymptotic limit process. As a consequence, we give the affirmative answer to the question that there is no jump for the property that the collision operator with cutoff does not have the spectrum gap but the operator without cutoff does have for the moderate soft potentials.

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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