Effects of Non-Thermal Electrons and Non-Extensive Positrons on Solitary Waves in a Multi-Component Dusty Plasma
Abstract
In this study, we have investigated the existence and characteristics of solitons in an unmagnetized dusty plasma composed of cold ions, negatively charged dust grains , positively charged dust grains, non-thermal electrons and non-extensive positrons. The properties of solitons are usually studied through the Reductive Perturbation method and the Sagdeev Potential method. We have derived the energy integral equation using the Sagdeev Potential method. We have also discussed the variation of the Sagdeev potential for different values of the parameters involved in our plasma model. The non-extensive parameter (q), the non-thermal parameter (β), charge density ratio of positively charged dust (δ+) , charge density ratio of negatively charged dust (δ_ ), positron to ion density ratio (δp), electron to ion density ratio (δe), electron to positron temperature ratio (σp) and the Mach number (M) found to influence the amplitude of solitons. Our study reveals that non-thermality of electrons and non-extensivity of positrons significantly modify the soliton features. The results from our study can be useful for investigating plasma in space environments such as cometary tails and interstellar clouds.
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