准聚焦电荷近似(QLCA)理论中汤川流体激波的数值验证

IF 1.3 4区 物理与天体物理 Q3 PHYSICS, FLUIDS & PLASMAS
Prince Kumar, Devendra Sharma
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引用次数: 0

摘要

本文介绍了对汤川系统准局域态非线性激发的第一原理分子动力学(MD)模拟研究,以验证非线性准局域电荷近似(QLCA)模型的发现。与固体或气体不同,准局域态缺乏某些简化特征,例如无法假设固定的形状或体积,而且它们结合了大位移和强相互作用,使其行为的理论基础更加复杂。在最近的一篇论文[P. Kumar 和 D. Sharma,Physics of Plasmas 30 (2023)]中,非线性 QLCA 模型被应用于描述汤川系统准局域态的非线性激发,因为现有的连续模型在这一机制中显示出有限的成功。根据筛选和耦合参数得出的模拟数据显示,与 QLCA 模型的结论非常吻合。MD 模拟验证了 QLCA 模型的预测,即孤子的特性不受耦合参数变化的影响。MD 模拟数据还证实了 QLCA 预测的在较高筛选参数值下会形成多个孤子的情况。此外,还讨论了在 QLCA 模型中相对较高的屏蔽参数值下形成稀疏孤子的可能性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Numerical validation of Yukawa fluid excitations within the quasilocalized charge approximation (QLCA) theory

A first principle molecular dynamics (MD) simulation study on the nonlinear excitations in a quasi-localized state of a Yukawa system is presented to validate the findings of the nonlinear quasi-localized charge approximation (QLCA) model. Unlike solids or gases, quasi-localized states lack certain simplifying features, such as the ability to assume a fixed shape or volume, and they combine large displacements with strong interactions, further complicating the theoretical underpinnings of their behavior. In a recent paper [P. Kumar and D. Sharma, Physics of Plasmas 30 (2023)], the nonlinear QLCA model was applied to characterize the nonlinear excitations in a quasi-localized state of a Yukawa system, as existing continuum models have shown limited success in this regime. The simulation data presented with the screening and coupling parameters show a close agreement with the QLCA model findings. The MD simulations validate the prediction made by the QLCA model that the properties of a soliton remain unaffected by variations in the coupling parameter. The prediction made by QLCA regarding the formation of multiple solitons at higher screening parameter values has also been confirmed by the MD simulation data. The possibility of the formation of rarefactive solitons at relatively high screening parameter values within the QLCA model is also discussed.

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来源期刊
Contributions to Plasma Physics
Contributions to Plasma Physics 物理-物理:流体与等离子体
CiteScore
2.90
自引率
12.50%
发文量
110
审稿时长
4-8 weeks
期刊介绍: Aims and Scope of Contributions to Plasma Physics: Basic physics of low-temperature plasmas; Strongly correlated non-ideal plasmas; Dusty Plasmas; Plasma discharges - microplasmas, reactive, and atmospheric pressure plasmas; Plasma diagnostics; Plasma-surface interaction; Plasma technology; Plasma medicine.
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