Effect of Viscosity on Highly Relativistic Ion Acoustic Shock Waves in an Electron–Positron-Ion Plasma with the Pressure Variation Equation

IF 1.5 4区 物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY
R. Das, M. Das, E. Hincal, K. Hosseini, F. Alizadeh
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引用次数: 0

Abstract

The Korteweg-de Vries–Burgers (KdV–B) equation is developed using the reductive perturbation method (RPM) to investigate the propagation properties of ion acoustic shock waves (IASHWs) in a highly relativistic plasma containing relativistic thermal ions, thermal positrons, and non-thermal electrons. Only fast mode is found to exist in the electron–positron-ion (epi) plasma of IASHWs. The impact of varying plasma parameters on the shock wave amplitude is examined. The behaviour of nonlinear and dispersion coefficients under the influence of relativistic factor \((\nu )\) and ion to electron temperature ratio \((\alpha )\) has been examined. Shock waves are produced by increasing the values of the relativistic factor, positron concentration \((\delta )\), and electron to positron temperature ratio \((\sigma )\). It is also found that the presence of the kinematic viscosity \(({\eta }_{i0})\) generates shock wave structures. Moreover, the shock wave amplitude reduces with a higher order relativistic impact and increases with a lower order relativistic effect. As a result, shock waves appear to have a significantly bigger amplitude in a non-relativistic environment. The findings might be applicable to both inertial confinement fusion plasmas and astrophysical plasmas.

粘度对电子-正电子-离子等离子体中高相对论性离子声激波的影响及压力变化方程
利用约化微扰法(RPM)建立了Korteweg-de Vries-Burgers (KdV-B)方程,研究了离子声激波(IASHWs)在含有相对论性热离子、热正电子和非热电子的高度相对论性等离子体中的传播特性。在IASHWs的电子-正电子-离子(epi)等离子体中只存在快模式。研究了不同等离子体参数对激波振幅的影响。考察了非线性系数和色散系数在相对论性因子\((\nu )\)和离子电子温度比\((\alpha )\)影响下的行为。冲击波是通过增加相对论系数、正电子浓度\((\delta )\)和电子与正电子温度比\((\sigma )\)的值来产生的。还发现运动粘度\(({\eta }_{i0})\)的存在会产生激波结构。激波振幅随高阶相对论性影响而减小,随低阶相对论性影响而增大。因此,在非相对论性环境中,激波的振幅明显更大。这些发现可能适用于惯性约束聚变等离子体和天体物理等离子体。
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来源期刊
Brazilian Journal of Physics
Brazilian Journal of Physics 物理-物理:综合
CiteScore
2.50
自引率
6.20%
发文量
189
审稿时长
6.0 months
期刊介绍: The Brazilian Journal of Physics is a peer-reviewed international journal published by the Brazilian Physical Society (SBF). The journal publishes new and original research results from all areas of physics, obtained in Brazil and from anywhere else in the world. Contents include theoretical, practical and experimental papers as well as high-quality review papers. Submissions should follow the generally accepted structure for journal articles with basic elements: title, abstract, introduction, results, conclusions, and references.
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