Faculty of Physics, Lomonosov Moscow State University, Moscow, Russian Federation.
Department of Physics, G. C. University Lahore, Katchery Road, Lahore 54000, Pakistan and Faculty of Physics, Lomonosov Moscow State University, Moscow, Russian Federation.
Phys Rev E. 2016 Mar;93(3):033209. doi: 10.1103/PhysRevE.93.033209. Epub 2016 Mar 28.
We consider the separate spin evolution of electrons and positrons in electron-positron and electron-positron-ion plasmas. We consider the oblique propagating longitudinal waves in these systems. Working in a regime of high-density n(0) ∼ 10(27) cm(-3) and high-magnetic-field B(0)=10(10) G, we report the presence of the spin-electron acoustic waves and their dispersion dependencies. In electron-positron plasmas, similarly to the electron-ion plasmas, we find one spin-electron acoustic wave (SEAW) at the propagation parallel or perpendicular to the external field and two spin-electron acoustic waves at the oblique propagation. At the parallel or perpendicular propagation of the longitudinal waves in electron-positron-ion plasmas, we find four branches: the Langmuir wave, the positron-acoustic wave, and a pair of waves having spin nature, they are the SEAW and the wave discovered in this paper, called the spin-electron-positron acoustic wave (SEPAW). At the oblique propagation we find eight longitudinal waves: the Langmuir wave, the Trivelpiece--Gould wave, a pair of positron-acoustic waves, a pair of SEAWs, and a pair of SEPAWs. Thus, for the first time, we report the existence of the second positron-acoustic wave existing at the oblique propagation and the existence of SEPAWs.
我们研究了正负电子和正负电子离子等离子体中电子和正电子的自旋演化。我们研究了这些系统中斜向传播的纵向波。在高密度 n(0) ∼ 10(27) cm(-3) 和高磁场 B(0)=10(10) G 的条件下，我们报告了自旋电子声波的存在及其色散依赖性。在正负电子等离子体中，与正负离子等离子体类似，我们发现了一种在平行或垂直于外场传播的自旋电子声波（SEAW），以及两种在斜向传播的自旋电子声波。在正负电子离子等离子体中纵向波的平行或垂直传播中，我们发现了四个分支：朗缪尔波、正电子声波以及一对具有自旋性质的波，它们是 SEAW 和本文发现的波，称为自旋电子正电子声波（SEPAW）。在斜向传播中，我们发现了八个纵向波：朗缪尔波、特里维皮切-古尔德波、一对正电子声波、一对 SEAW 以及一对 SEPAW。因此，我们首次报告了在斜向传播中存在第二个正电子声波和 SEPAWs 的存在。
