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arXiv 2106.09062math.AP
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具有多项式衰减初值的超软势Boltzmann方程的局部适定性

Local well-posedness for the Boltzmann equation with very soft potential and polynomially decaying initial data

Christopher Henderson, Weinan Wang

摘要:

本文研究了当初始数据以速度为变量按多项式衰减时,空间非齐次非截断Boltzmann方程的局部适定性。我们考虑的情况下,非常软的潜力$γ+ 2s < 0$。我们的主要结果完成了图片的局部适定性在这个衰变类通过删除以前的作品的限制$γ+ 2s > -3/2$。我们的方法是完全基于碰撞算子的Carleman分解成一个较低的阶项和积分-微分算子类似的分数拉普拉斯算子。有趣的是,当$γ\in (-3,0]$和$s \in (0,1/2)$在一个我们也包含的加权$C^1$空间中时,这产生了一个非常简短的局部适定性的证明。

英文摘要:

In this paper, we address the local well-posedness of the spatially inhomogeneous non-cutoff Boltzmann equation when the initial data decays polynomially in the velocity variable. We consider the case of very soft potentials $γ+ 2s < 0$. Our main result completes the picture for local well-posedness in this decay class by removing the restriction $γ+ 2s > -3/2$ of previous works. Our approach is entirely based on the Carleman decomposition of the collision operator into a lower order term and an integro-differential operator similar to the fractional Laplacian. Interestingly, this yields a very short proof of local well-posedness when $γ\in (-3,0]$ and $s \in (0,1/2)$ in a weighted $C^1$ space that we include as well.

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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