Department of Nuclear Engineering, Pakistan Institute of Engineering and Applied Sciences, P.O. Nilore, Islamabad 45650, Pakistan.
Center for Mathematical Sciences, Pakistan Institute of Engineering and Applied Sciences, P.O. Nilore, Islamabad 45650, Pakistan.
Phys Rev E. 2019 Jan;99(1-2):017201. doi: 10.1103/PhysRevE.99.017201.
Saberian and Esfandyari-Kalejahi [Phys. Rev. E 87, 053112 (2013)10.1103/PhysRevE.87.053112] have discussed Langmuir oscillations in a q-nonextensive electron-positron plasma. However, some of the results obtained and the conclusions drawn in this paper are not appropriate. In Fig. 3 of the above mentioned paper, the authors have claimed that for certain values of nonextensivity parameter q the imaginary part of the frequency becomes positive, resulting in unstable oscillations. In this Comment we shall discuss the fact that the Landau damping rate of Langmuir oscillations in a q-nonextensive electron-positron plasma is negative and results in damped oscillations. We hope that this Comment will be helpful in providing a better picture of Langmuir oscillations in nonextensive electron-positron plasma.
萨伯里安和埃斯凡迪亚里-卡莱加希[Phys. Rev. E 87, 053112 (2013)10.1103/PhysRevE.87.053112]讨论了 q-非广延电子-正电子等离子体中的朗缪尔振荡。然而，本文得到的一些结果和得出的结论并不恰当。在上述论文的图 3 中，作者声称对于某些非广延参数 q 的值，频率的虚部变为正，导致不稳定的振荡。在这篇评论中，我们将讨论这样一个事实，即在 q-非广延电子-正电子等离子体中朗缪尔振荡的朗道阻尼率为负，导致阻尼振荡。我们希望这篇评论有助于更清楚地了解非广延电子-正电子等离子体中的朗缪尔振荡。
