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arXiv 1707.07754math.APphysics.flu-dyn
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最优索伯列夫空间中MHD系统正则性的传播

Propagation of regularity for the MHD system in optimal Sobolev space

Mimi Dai

摘要:

研究了不可压缩粘性无阻磁流体动力学系统解的正则性传播问题。根据缩放,索伯列夫空间$H^{\frac n2-1}(\mathbb R^n)\times H^{\frac n2}(\mathbb R^n)$对于系统是关键的。我们证明了如果一个弱解$(u(t),b(t))$在某个时刻$t_0$与$s>\frac n2-1$处于$H^{s}(\mathbb R^n)\times H^{s+1}(\mathbb R^n)$中,那么它将在空间中停留很短的时间,只要初始速度为$u(0)\in H^s(\mathbb R^n)$。在已知$H^{s}(\mathbb R^n)\times H^{s+1}(\mathbb R^n)$弱解的唯一性的情况下,不需要$u(0)\in H^s(\mathbb R^n)$的假设。

英文摘要:

We study the problem of propagation of regularity of solutions to the incompressible viscous non-resistive magneto-hydrodynamics system. According to scaling, the Sobolev space $H^{\frac n2-1}(\mathbb R^n)\times H^{\frac n2}(\mathbb R^n)$ is critical for the system. We show that if a weak solution $(u(t),b(t))$ is in $H^{s}(\mathbb R^n)\times H^{s+1}(\mathbb R^n)$ with $s>\frac n2-1$ at a certain time $t_0$, then it will stay in the space for a short time, provided the initial velocity $u(0)\in H^s(\mathbb R^n)$. In the case that the uniqueness of weak solution in $H^{s}(\mathbb R^n)\times H^{s+1}(\mathbb R^n)$ is known, the assumption of $u(0)\in H^s(\mathbb R^n)$ is not necessary.

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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