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arXiv 2602.18155math.AP
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圆环涡旋线在非对称扰动下的稳定性

Stability of the Shape for Circular Vortex Filaments under Non-Symmetric Perturbations

Tokyo University of Science(东京科学大学);Kobe University(神户大学)

Masashi Aiki, Mitsuo Higaki

AI总结:

研究圆环涡旋线在非对称扰动下的非线性轨道稳定性,通过几何稳定性引理和等周不等式证明其形状在模去平移和旋转后保持稳定。

摘要:

我们建立了在局部诱导方程(LIE)框架下,圆环涡旋线在非对称扰动下的非线性轨道稳定性。这一结果扩展了第一作者最近的工作[Aiki, 2025],通过去除对扰动的对称性假设。虽然圆环涡旋线由于线性增长的平移模式而已知是Lyapunov不稳定的,但我们证明其形状在模去空间平移和绕对称轴旋转后仍能保持全局稳定。关键的组成部分是一个从向量流体动量守恒导出的几何稳定性引理,它约束了未被相对能量覆盖的低频调制。最后,我们将流体动量与等周不等式相关联,为闭合丝线提供了一个几何约束。

英文摘要:

We establish the nonlinear orbital stability of circular vortex filaments governed by the Localized Induction Equation (LIE) under non-symmetric perturbations, within the framework of [Tani-Nishiyama, 1997]. This result extends the first author's recent work [Aiki, 2025] by removing symmetry assumptions on perturbations. While the circular filaments are known to be Lyapunov unstable due to linear growth of the translational mode, we prove that their shape remains globally stable modulo spatial translations and rotations about the symmetry axis. The crucial ingredient is a geometric stability estimate derived from the conservation of vector fluid impulse, which constrains the low-frequency modulations that are not covered by the relative energy. Finally, we relate the fluid impulse to an isoperimetric inequality, yielding a geometric constraint for closed filaments.

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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