Overtaking collisions of oblique isothermal ion‐acoustic multisolitons are studied in an ultra‐relativistic degenerate dense magnetoplasma, containing non‐degenerate inertial warm ions and ultra‐relativistic degenerate inertialess electrons and positrons. A non‐linear Korteweg‐de Vries (KdV) equation describing oblique isothermal ion‐acoustic solitons (OIIASs) in such a plasma model is derived. By applying Hirota's bilinear method (HBM), the overtaking collisions of oblique isothermal ion‐acoustic multisoliton solutions are investigated. An in‐depth discussion shows that the amplitude, the width, and the phase shift of isothermal ion‐acoustic multisolitons increase as the obliqueness and the chemical potential of electrons increase. The deviation of the trajectories decreases with increasing concentration of fermions and the ion cyclotron frequency. The present finding of this study is applicable in compact objects, such as white dwarfs and neutron stars, having degenerate ultra‐relativistic dense electrons and positrons.

中文翻译：

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超相对论简并稠密磁致等离子体中斜等温离子声多孤子的超车碰撞

在超相对论简并的致密磁等离子体中研究了斜等温离子-声多孤子的超车碰撞，其中包含非简并惯性温离子和超相对论简并的无惯性电子和正电子。推导了描述这种等离子模型中的非线性等温离子声孤子（OIIAS）的非线性Korteweg-de Vries（KdV）方程。通过应用Hirota的双线性方法（HBM），研究了斜等温离子-声多孤子溶液的超车碰撞。深入的讨论表明，等温离子声多孤子的振幅，宽度和相移随电子的倾斜度和化学势的增加而增加。轨道的偏差随着费米子浓度和离子回旋频率的增加而减小。这项研究的当前发现适用于具有退化的超相对论致密电子和正电子的紧凑物体，例如白矮星和中子星。