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arXiv 2501.09679math.AP
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Yudovich类中不可压缩Euler--Maxwell方程的不适定性

Ill-Posedness of the Incompressible Euler--Maxwell Equations in the Yudovich Class

Haroune Houamed

AI总结:

本文针对二维不可压缩Euler--Maxwell系统,证明了Yudovich类中适定性所需的Normal Structure条件是紧的,不满足该条件时系统不适定,结果适用于全平面与二维环面及任意正光速。

摘要:

Arsénio与本文作者近期已证明,若电磁场满足包括Normal Structure(正规结构)在内的适当条件,二维不可压缩Euler--Maxwell系统在Yudovich类中是全局适定的。本文证明该假设是紧的,即当初始数据不满足Normal Structure条件时,Euler--Maxwell系统在Yudovich类中是不适定的。该证明既适用于全平面也适用于二维环面,且对任意光速$c\in (0,\infty)$均成立。证明通过将磁场在水平背景场附近展开,并证明洛伦兹力可分解为两部分:第一部分是作用于涡量的奇异算子形式,第二部分为“余项”,在特定时间区间内分析时具有更低阶数。

英文摘要:

It was shown recently by Arsénio and the author that the two-dimensional incompressible Euler--Maxwell system is globally well-posed in the Yudovich class, provided that the electromagnetic field enjoys appropriate conditions, including the Normal Structure. In this paper, we prove that this assumption is sharp, in the sense that the Euler--Maxwell system becomes ill-posed in the Yudovich class for initial data that do not obey the Normal Structure condition. The proof applies to both the whole plane and the two-dimensional torus, and holds for any value of the speed of light $c\in (0,\infty)$. This is achieved by expanding the magnetic field around a horizontal background and showing that the Lorentz force can be decomposed into two parts: the first is in the form of a singular operator acting on the vorticity, and the second, a "remainder", is of lower order when analyzed in a specific time regime.

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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