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arXiv 1404.0486math.AP
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分数阶磁扩散Hall-MHD方程的局部适定性

Local well-posedness for the Hall-MHD equations with fractional magnetic diffusion

Dongho Chae, Renhui Wan, Jiahong Wu

摘要:

霍尔磁流体动力学(Hall-MHD)方程是从动力学模型严格推导出来的,在天体物理学和天体物理学中有着广泛的应用。研究了由分数阶Laplacian算子$(-Δ)^α$给出的具有磁扩散的Hall-MHD方程经典解的局部适定性.由于霍尔-MHD方程中的霍尔项的存在,标准能量估计似乎表明,我们需要$α\ge 1$,以获得当地的适定性。本文突破了这一障碍,证明了分数阶Hall-MHD方程对任何$α>\frac12$都是局部适定的.这里的方法充分利用了耗散的平滑效应,并通过Besov空间技术建立了Sobolev范数的局部界。本文所提出的方法也适用于其它偏微分方程的类似情况。

英文摘要:

The Hall-magnetohydrodynamics (Hall-MHD) equations, rigorously derived from kinetic models, are useful in describing many physical phenomena in geophysics and astrophysics. This paper studies the local well-posedness of classical solutions to the Hall-MHD equations with the magnetic diffusion given by a fractional Laplacian operator, $(-Δ)^α$. Due to the presence of the Hall term in the Hall-MHD equations, standard energy estimates appear to indicate that we need $α\ge 1$ in order to obtain the local well-posedness. This paper breaks the barrier and shows that the fractional Hall-MHD equations are locally well-posed for any $α>\frac12$. The approach here fully exploits the smoothing effects of the dissipation and establishes the local bounds for the Sobolev norms through the Besov space techniques. The method presented here may be applicable to similar situations involving other partial differential equations.

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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