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arXiv 2602.09293math.APphysics.plasm-ph
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离子-电子态用于双组分Vlasov-Poisson方程

Ions-electrons-states for the two-component Vlasov-Poisson equation

Università degli Studi di Milano(米兰大学)

Emeric Roulley

AI总结:

该研究通过动态演变双组分离子和电子,建立了Vlasov-Poisson方程的旅行周期解分支,并揭示了与Euler-Poisson系统的关系。

摘要:

我们建立了单维双物种Vlasov-Poisson方程旅行周期解的局部和全局分支结果。这些解由相空间中的条带状离子和电子区域组成,这些区域能够相干地传播,并从空间上均匀、速度依赖的平衡层中出现。根据底层平衡的几何形状和所选傅里叶模式,分支图谱显示要么有两个要么有四个解分支。在所有情况下,分支都是pitchfork型;在对称配置中,平衡附近局部结构具有双曲几何。我们进一步证明这些局部构造的分支可以扩展到全局。这项工作扩展了作者之前对纯电子情况的研究,其中离子被建模为中性化背景。允许两种物种动态演变导致了更复杂、更高维的分析。最后,通过仿射变量变换,我们揭示了与一维双组分Euler-Poisson系统之间的联系,这使得该模型也能构造出小振幅和大振幅的旅行周期波。

英文摘要:

We establish both local and global bifurcation results for traveling periodic solutions of the one-dimensional two-species Vlasov-Poisson equation. These solutions consist of strip-like regions of ions and electrons in phase space that propagate coherently and emerge from spatially homogeneous, velocity-dependent equilibrium layers. Depending on the geometry of the underlying equilibrium and on the selected Fourier mode, the bifurcation diagram exhibits either two or four solution branches. In all cases, the bifurcation is of pitchfork type; in symmetric configurations, the local structure near the equilibrium has a hyperbolic geometry. We further show that these locally constructed branches extend globally. This work extends the previous study by the same author of the purely electronic case, where the ions were modeled as an immobile neutralizing background. Allowing both species to evolve dynamically leads to a more intricate, higher-dimensional analysis. Finally, by means of an affine change of variables, we reveal a connection with the one-dimensional two-component Euler-Poisson system, which in turn enables the construction of traveling periodic waves of both small and large amplitude for that model as well.

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