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Propagation of nonlinear excitations of dust acoustic waves by a moving charged object in superthermal plasmas

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Abstract

We present the nonlinear propagation dynamics of dust acoustic wave (DAW) excitations due to charged moving object in a dusty plasma consisting of inertial dust fluid with electrons and ions having kappa velocity distribution. In the small amplitude limit, it is revealed that moving charge-induced plasma fluid equations are reduced to a forced Korteweg–de Vries (fKdV) equation. Time-dependent numerical simulation reveals the formation of precursor waves ahead of the forcing disturbance in the upstream region propagating at a faster speed with trailing wakes in the downstream region. The effects of superthermality of charged particles on nonlinear excitations are also investigated. Additionally, for arbitrary amplitude waves, the analysis is performed for stationary wave frame moving at the same velocity of the charged object to elucidate rich variety of soliton-like solutions: single peak soliton, the so-called W-shaped and pinned solitons depending on the variation of relevant plasma parameters.

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Authors and Affiliations

  1. Department of Mathematics, West Bengal State University, Barasat, Kolkata, 700 126, India

    Shubhra Bhowmick & Biswajit Sahu

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  1. Shubhra Bhowmick
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  2. Biswajit Sahu
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Correspondence to Biswajit Sahu.

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Bhowmick, S., Sahu, B. Propagation of nonlinear excitations of dust acoustic waves by a moving charged object in superthermal plasmas. Indian J Phys 96, 3023–3030 (2022). https://doi.org/10.1007/s12648-021-02224-9

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  • DOI: https://doi.org/10.1007/s12648-021-02224-9

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