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arXiv 2607.06910math.AP
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具有各向异性耗散的三维可压缩磁流体动力学方程背景磁场的非线性稳定性

Nonlinear stability of a background magnetic field for the 3D compressible MHD equations with anisotropic dissipation

Sun Yat-sen University(中山大学);The Hong Kong Polytechnic University(香港理工大学);University of Notre Dame(圣母大学)

Jincheng Gao, Xianpeng Hu, Lianyun Peng, Jiahong Wu

AI总结:

研究三维可压缩MHD方程在强各向异性状态下背景磁场平衡态的非线性稳定性,通过背景磁场增强耗散及非线性抵消机制,证明对接近平衡态的初值系统有唯一全局解及定量耗散估计。

摘要:

我们研究了全空间\(\mathbb{R}^3\)中三维可压缩磁流体动力学(MHD)方程在强各向异性状态下具有背景磁场的平衡态的非线性稳定性,此时速度仅在水平方向耗散,磁场沿单一方向扩散。我们证明,对于Sobolev空间中充分接近平衡态的初值,该系统存在唯一的全局时间解,该解保持接近平衡态并具有定量耗散估计。证明通过两种机制克服了严重的耗散不足:背景磁场对磁场和密度产生增强耗散,同时设计了一种非线性抵消机制来解决可压缩耦合导致的垂直导数损失。

英文摘要:

We study the nonlinear stability of an equilibrium with a background magnetic field for the three-dimensional compressible magnetohydrodynamic (MHD) equations in the whole space $\mathbb{R}^3$, in the strongly anisotropic regime where the velocity is dissipated only in the horizontal directions and the magnetic field is diffused in a single direction. We prove that for initial data sufficiently close to the equilibrium in a Sobolev space, the system admits a unique global-in-time solution that remains close to the equilibrium and enjoys quantitative dissipation estimates. The proof overcomes the severe lack of dissipation through two mechanisms: the background magnetic field is shown to generate enhanced dissipation for the magnetic field and the density, while a nonlinear cancellation mechanism is devised to resolve the loss of vertical derivatives caused by the compressible coupling.

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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