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arXiv 1107.2190physics.plasm-ph
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对“量子电子-正电子-离子等离子体中两个孤立波的相互作用”的评论[Phys. Plasmas \textbf{18},052301(2011)]

Comment on "Interaction of two solitary waves in quantum electron-positron-ion plasma" [Phys. Plasmas \textbf{18}, 052301 (2011)]

M. Akbari-Moghanjoughi

摘要:

最近,Yan-Xia Xu等人在文献[Phys. Plasmas \textbf{18},052301(2011)]中研究了非磁化三维电子-正电子-离子量子等离子体中各种等离子体参数对两个离子-声孤立波相互作用的影响。他们使用扩展的约化微扰技术,即所谓的扩展庞加莱-莱特希尔-郭(PLK)技术,从量子流体力学(QHD)模型中推导出导致孤立子动力学性质的微分方程,即Korteweg-de Vries演化方程(每个波一个)和描述二维碰撞引起的孤立子轨迹相移的耦合微分方程。计算出的碰撞相移的变化,然后在众多的等离子体分数参数的数值检查。在这篇评论中,我们给出了一些具体的说明,上述文章的结果的有效性,并提到重要的误解使用的费米温度在量子等离子体中,出现在这篇文章和许多其他最近发表的。

英文摘要:

Recently, Yan-Xia Xu, et al. in the article Ref. [Phys. Plasmas \textbf{18}, 052301 (2011)] have studied the effects of various plasma parameters on interaction of two ion-acoustic solitary waves in an unmagnetized three-dimensional electron-positron-ion quantum plasma. They have used the extended reductive perturbation technique, the so-called, extended Poincare'-Lighthill-Kuo (PLK) technique, to deduce from the model governing the quantum hydrodynamics (QHD) differential equations leading to the soliton dynamical properties, namely, Korteweg-de Vries evolution equations (one for each wave) and coupled differential equations describing the phase-shift in trajectories of solitons due to the two dimensional collision. The variation of the calculated collision phase-shifts are then numerically inspected in terms of numerous plasma fractional parameters. In this comment we give some notes specific to the validity of the results of above-mentioned article and refer to important misconceptions about the use of the Fermi-temperature in quantum plasmas, appearing in this article and many other recently published ones.

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