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arXiv 2103.07773math.APmath-phmath.MP
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热磁相对论Vlasov Maxwell系统经典解的一致寿命

Uniform Lifetime for Classical Solutions to the Hot, Magnetized, Relativistic Vlasov Maxwell System

Christophe Cheverry, Slim Ibrahim, Dayton Preissl

摘要:

本文研究磁约束等离子体的相空间动力学描述。它解决了相对论Vlasov Maxwell系统平衡点附近的稳定性问题。我们在密度函数$f(t,\cdot)$上的紧支持动量假设下工作。磁约束等离子体的特征在于存在强的外部磁场$ x \mapsto ε^{-1} \mathbf{B}_e(x)$,其中$ε$是与电子的逆回转频率相关的小参数。相比之下,自洽的内部电磁场$(E,B) $被认为是小的。在非磁化设置中,局部$ C^1 $解确实存在,但不排除在有限时间内对大数据爆破的可能性。因此,在强磁化的情况下,由于$ ε^{-1} $很大,标准结果预测,当$ ε$变为$ 0 $时,溶液的寿命$T_ε$可能会缩小到零。在这篇文章中,通过现场矫直,和时间平均程序,我们显示了一个统一的下限($0<T<T_ε$)的解决方案和统一的Sup-Norm估计的寿命。一个自举参数允许我们显示$f$保持在距离$ε$从线性化系统,而内部字段可以不同的顺序为1准备好的初始数据。

英文摘要:

This article is devoted to the kinetic description in phase space of magnetically confined plasmas. It addresses the problem of stability near equilibria of the Relativistic Vlasov Maxwell system. We work under the Glassey-Strauss compactly supported momentum assumption on the density function $f(t,\cdot)$. Magnetically confined plasmas are characterized by the presence of a strong external magnetic field $ x \mapsto ε^{-1} \mathbf{B}_e(x)$, where $ε$ is a small parameter related to the inverse gyrofrequency of electrons. In comparison, the self consistent internal electromagnetic fields $(E,B) $ are supposed to be small. In the non-magnetized setting, local $ C^1 $-solutions do exist but do not exclude the possibility of blow up in finite time for large data. Consequently, in the strongly magnetized case, since $ ε^{-1} $ is large, standard results predict that the lifetime $T_ε$ of solutions may shrink to zero when $ ε$ goes to $ 0 $. In this article, through field straightening, and a time averaging procedure we show a uniform lower bound ($0<T<T_ε$) on the lifetime of solutions and uniform Sup-Norm estimates. A bootstrap argument allows us to show $f$ remains at a distance $ε$ from the linearized system, while the internal fields can differ by order 1 for well prepared initial data.

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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