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一维磁流体力学模型的稳定性与不稳定性

Stability and instability of a one-dimensional MHD model

Università di Pisa(比萨大学);Capital Normal University(首都师范大学)

Nicola De Nitti, Jie Guo, Quansen Jiu

AI总结:

本文研究了一维磁流体力学模型的稳定性与不稳定性,通过分析第一激发态附近的线性和非线性系统,揭示了加权Sobolev空间中广泛初始数据下的不稳定性机制。

摘要:

我们考虑由Dai等人(2023)引入的一维磁流体力学模型,在参数域中,当不存在磁场时,系统退化为De Gregorio模型的欧拉方程模型。我们分析了在环面上第一激发态附近的稳定性与不稳定性,从而推广了Guo和Jiu(2025)对De Gregorio模型最近获得的结果。具体来说,我们建立了线性化系统的全局适定性,非线性系统的局部适定性,并证明了在Lai等人(2020)引入的加权Sobolev空间中,对于广泛初始数据,线性和非线性系统均表现出不稳定性。我们识别了主线性化算子,其结构等价于De Gregorio模型的算子,作为不稳定性的主要机制。此外,我们证明了在上述加权Sobolev空间的特定子空间中,线性和非线性系统的全局适定性和稳定性。

英文摘要:

We consider a one-dimensional magnetohydrodynamics model introduced by Dai \textit{et al.}~(2023), in a parameter regime where, in the absence of a magnetic field, the system reduces to the De Gregorio model for the Euler equations. We analyze stability and instability near the first excited state on the torus, thus generalizing the recent results obtained by Guo and Jiu~(2025) for the De Gregorio model. Specifically, we establish global well-posedness of the linearized system, local well-posedness for the nonlinear system, and demonstrate both linear and nonlinear instability for a broad class of initial data in the weighted Sobolev space introduced by Lai \textit{et al.}~(2020). We identify the principal linearized operator, which is structurally equivalent to that of the De Gregorio model, as the primary mechanism of instability. Moreover, we prove global well-posedness and stability of both linear and nonlinear systems for initial data in a particular subspace of the aforementioned weighted Sobolev space.

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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