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arXiv 2007.15758math.AP
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具有径向对称性的多维欧拉动力学

Eulerian dynamics in multi-dimensions with radial symmetry

Changhui Tan

摘要:

我们研究了多维径向对称数据下无压欧拉动力学的整体适定性。与一维系统相比,多维欧拉动力学的一个主要区别是谱隙的存在,这是很难控制的。我们提出了一对新的标量,提供了一个显着的更好的控制的光谱间隙。两个应用程序。(i)的欧拉-泊松方程:我们显示了一个尖锐的阈值条件的初始数据,区分全球的正则性和有限时间爆破;(ii)欧拉对齐方程:我们显示了一个大的亚临界区域的初始数据,导致全球平滑的解决方案。

英文摘要:

We study the global wellposedness of pressure-less Eulerian dynamics in multi-dimensions, with radially symmetric data. Compared with the 1D system, a major difference in multi-dimensional Eulerian dynamics is the presence of the spectral gap, which is difficult to control in general. We propose a new pair of scalar quantities that provides a significant better control of the spectral gap. Two applications are presented. (i) the Euler-Poisson equations: we show a sharp threshold condition on initial data that distinguish global regularity and finite time blowup; (ii) the Euler-alignment equations: we show a large subcritical region of initial data that leads to global smooth solutions.

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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