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arXiv 1807.04367physics.plasm-ph
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Vlasov-麦克斯韦方程组的微扰变分形式

Perturbative variational formulation of the Vlasov-Maxwell equations

Alain J. Brizard

摘要:

在微扰分析中,给出了Vlasov-麦克斯韦方程组的三阶微扰变分形式。分别从二阶和三阶拉格朗日密度出发,将一阶和二阶Vlasov-麦克斯韦方程组表示为规范不变和规范无关的形式。在导出线性非绝热旋动力学Vlasov-麦克斯韦方程组的约化二阶Vlasov-Maxwell拉格朗日量的基础上,导出了线性漂移波方程和线性混合动力学-磁流体动力学(MHD)方程的约化拉格朗日密度,并用Noether方法得到了相应的波作用守恒律.给出了线性混合动力学-MHD方程的精确波作用量守恒定律。推导出了三阶弗拉索夫-麦克斯韦拉格朗日量的新形式,其中有质动力效应起着至关重要的作用。

英文摘要:

The perturbative variational formulation of the Vlasov-Maxwell equations is presented up to third order in the perturbation analysis. From the second and third-order Lagrangian densities, respectively, the first-order and second-order Vlasov-Maxwell equations are expressed in gauge-invariant and gauge-independent forms. Upon deriving the reduced second-order Vlasov-Maxwell Lagrangian for the linear nonadiabatic gyrokinetic Vlasov-Maxwell equations, the reduced Lagrangian densities for the linear drift-wave equation and the linear hybrid kinetic-magnetohydrodynamic (MHD) equations are derived, with their associated wave-action conservation laws obtained by Noether method. The exact wave-action conservation law for the linear hybrid kinetic-MHD equations is written explicitly. A new form of the third-order Vlasov-Maxwell Lagrangian is derived in which ponderomotive effects play a crucial role.

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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