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arXiv 2007.08580math.APphysics.plasm-ph
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$\mathbb R^3$中Vlasov-Poisson线性化消波结构

Linearized wave-damping structure of Vlasov-Poisson in $\mathbb R^3$

Jacob Bedrossian, Nader Masmoudi, Clement Mouhot

摘要:

本文研究了$\mathbb R^3_x \times \mathbb R^3_v$中无限均匀Maxwell背景分布局域扰动的线性化泊松方程。与封闭的情况下$\mathbb T^d _x \times \mathbb R_v ^d$,或无约束的情况下$\mathbb R^d_x \times \mathbb R^d_v$与屏蔽,动态的扰动不散射向自由运输$t \to \pm \infty$:我们表明,电场分解成一个非常弱阻尼克莱因-戈登型的长波和朗道阻尼演化。Klein-Gordon型波解决,领先的顺序,可压缩的欧拉-泊松方程线性化的恒定密度状态,尽管事实上,我们的模型是无碰撞的,即没有趋势的局部或全局热化的分布函数在强拓扑。我们证明分散估计的Klein-Gordon部分的动态。电场的朗道阻尼部分在低频下衰减得比自由输运快,在高频下衰减得与受限情况相同;事实上,它的衰减速率与屏蔽情况相同。因此,对电场的贡献都不像在真空情况下那样表现。

英文摘要:

In this paper we study the linearized Vlasov-Poisson equation for localized disturbances of an infinite, homogeneous Maxwellian background distribution in $\mathbb R^3_x \times \mathbb R^3_v$. In contrast with the confined case $\mathbb T^d _x \times \mathbb R_v ^d$, or the unconfined case $\mathbb R^d_x \times \mathbb R^d_v$ with screening, the dynamics of the disturbance are not scattering towards free transport as $t \to \pm \infty$: we show that the electric field decomposes into a very weakly-damped Klein-Gordon-type evolution for long waves and a Landau-damped evolution. The Klein-Gordon-type waves solve, to leading order, the compressible Euler-Poisson equations linearized about a constant density state, despite the fact that our model is collisionless, i.e. there is no trend to local or global thermalization of the distribution function in strong topologies. We prove dispersive estimates on the Klein-Gordon part of the dynamics. The Landau damping part of the electric field decays faster than free transport at low frequencies and damps as in the confined case at high frequencies; in fact, it decays at the same rate as in the screened case. As such, neither contribution to the electric field behaves as in the vacuum case.

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