论文标题
部分退化等离子体中的离子声音孤波
Ion-acoustic solitary waves in a partially degenerate plasma
论文作者
论文摘要
在未磁性的，无碰撞的，无碰撞的，同质的电子 - 峰值离子（E-P-I）等离子体中，研究了任意振幅离子声（IA）孤立波（SWS）的传播。从一组经典离子的流体方程式开始，而归化电子和正面的费米 - 迪拉克分布得出了IA波的线性分散关系。可以看出，由于正电子物种的存在以及电子和正电子的有限温度退化的影响，波散的分散体受到了显着修饰。在非线性方案中，采用Sagdeev的假能力方法来研究与有限温度退化的参数，背景数密度以及电子和基数的热能。发现与经典电子离子等离子相比，亚音速和超音速IA-SW可以在部分退化的E-P-I等离子体中存在。
The propagation of arbitrary amplitude ion-acoustic (IA) solitary waves (SWs) is studied in unmagnetized, collisionless, homogeneous electron-positron-ion (e-p-i) plasmas with finite temperature degeneracy of both electrons and positrons. Starting from a set of fluid equations for classical ions and Fermi-Dirac distribution for degenerate electrons and positrons, a linear dispersion relation for IA waves is derived. It is seen that the wave dispersion is significantly modified due to the presence of positron species and the effects of finite temperature degeneracy of electrons and positrons. In the nonlinear regime, the Sagdeev's pseudopotential approach is employed to study the existence domain and the evolution of nonlinear IA-SWs in terms of the parameters that are associated with the finite temperature degeneracy, the background number densities, and the thermal energies of electrons and positrons. It is found that in contrast to classical electron-ion plasmas both the subsonic and supersonic IA-SWs can exist in a partially degenerate e-p-i plasma.
