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arXiv math/0604310math.AP
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关于磁流体力学方程中磁场和速度场的局部化

On the localization of the magnetic and the velocity fields in the equations of magnetohydrodynamics

Lorenzo Brandolese, François Vigneron

摘要:

研究了${\bf R}^d$中磁流体动力学方程的解在无穷远处关于空间变量的行为。我们证明,如果初始磁场衰减足够快,那么等离子体流的行为作为一个解决方案的自由nonstationnary斯托克斯方程时,$|x|\to +\infty$,磁场将支配等离子体的衰减,如果它是不良的本地化在开始的演变。我们的主要工具是加权空间中卷积算子的有界性准则。

英文摘要:

We study the behavior at infinity, with respect to the space variable, of solutions to the magnetohydrodynamics equations in ${\bf R}^d$. We prove that if the initial magnetic field decays sufficiently fast, then the plasma flow behaves as a solution of the free nonstationnary Navier--Stokes equations when $|x|\to +\infty$, and that the magnetic field will govern the decay of the plasma, if it is poorly localized at the beginning of the evolution. Our main tools are boundedness criteria for convolution operators in weighted spaces.

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