title: Effects of nonthermal ions and polarization force on dust-acoustic waves in a density-varying dusty plasma.
abstract: A rigorous theoretical investigation has been made of the effects of nonthermal ions and polarization force (which arises due to the dust density inhomogeneity) on the propagation of dust-acoustic (DA) waves in a density-varying unmagnetized dusty plasma (consisting of nonthermal ions, Maxwellian electrons, and negatively charged mobile dust) by the normal mode analysis. It has been shown that the dispersion properties of the DA waves are significantly modified by the presence of nonthermal ions and polarization force. It has been also found that the phase speed of the DA waves, as well as the dust density perturbation, increases (decreases) with the increase of nonthermal ions (polarization force), and that the potential associated with the DA waves decreases with the increase of the equilibrium dust number density. The implications of our results in the specific situation of space environments (dust-ion plasma situation) are also briefly discussed.
authors.affiliation: Department of Physics, Jahangirnagar University, Savar, Dhaka-1342, Bangladesh.
authors.forename: M
authors.initials: M
authors.lastname: Asaduzzaman
authors.forename: A A
authors.initials: AA
authors.lastname: Mamun
mesh_terms: D003198:Computer Simulation; D004391:Dust; D006358:Hot Temperature; D008956:Models, Chemical; D058626:Plasma Gases / Q000737:chemistry* / Q000528:radiation effects*; D011829:Radiation Dosage; D012212:Rheology / Q000379:methods*; D013016:Sound
chemical_list: D004391:Dust; D058626:Plasma Gases