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arXiv 1503.01651math.AP
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Besov空间中非电阻MHD方程解的局部存在性

Local existence for the non-resistive MHD equations in Besov spaces

Jean-Yves Chemin, David S. McCormick, James C. Robinson, Jose L. Rodrigo

摘要:

本文证明了在某些Besov空间(即$\boldsymbol{u}_{0} \in B^{n/2-1}_{2,1}$和$\boldsymbol{B}_{0} \in B^{n/2}_{2,1}$)中,对于无发散的初始数据,粘性无阻磁流体力学(MHD)方程$\mathbb{R}^{n}$,$n=2,3$整体解的存在性.先验估计值包括右侧的项$\int_{0}^{t} \| \boldsymbol{u}(s) \|_{H^{n/2}}^{2} \, \mathrm{d} s$,因此需要在$H^{n/2-1}$中设置辅助界限。在2D中,这是简单地实现使用标准的能量不等式;但在3D中,一个辅助估计在$H^{1/2}$是必需的,我们证明使用Calderón分裂方法(trans.Amer.Math.Soc.318(1),179- 200,1990)。相比之下,我们证明了这样的解决方案是唯一的在3D中,但在2D中的唯一性的证明是更困难的,仍然是开放的。

英文摘要:

In this paper we prove the existence of solutions to the viscous, non-resistive magnetohydrodynamics (MHD) equations on the whole of $\mathbb{R}^{n}$, $n=2,3$, for divergence-free initial data in certain Besov spaces, namely $\boldsymbol{u}_{0} \in B^{n/2-1}_{2,1}$ and $\boldsymbol{B}_{0} \in B^{n/2}_{2,1}$. The a priori estimates include the term $\int_{0}^{t} \| \boldsymbol{u}(s) \|_{H^{n/2}}^{2} \, \mathrm{d} s$ on the right-hand side, which thus requires an auxiliary bound in $H^{n/2-1}$. In 2D, this is simply achieved using the standard energy inequality; but in 3D an auxiliary estimate in $H^{1/2}$ is required, which we prove using the splitting method of Calderón (Trans. Amer. Math. Soc. 318(1), 179--200, 1990). By contrast, we prove that such solutions are unique in 3D, but the proof of uniqueness in 2D is more difficult and remains open.

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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