Modulational Instability of Dust Acoustic Waves in an Opposite Polarity Dusty Plasma in the Presence of Generalized Polarization Force with Superthermal Electrons and Ions

The modulational instability of dust acoustic (DA) waves propagating in a four-component dusty plasma system comprising negatively and positively charged dust grains as well as kappa-distributed electrons and ions has been studied in the presence of a generalized polarization force. The derivative expansion technique is used to derive a nonlinear Schrodinger equation (NLSE), which describes the nature of the modulational instability of DA waves. The conditions for the existence of the modulational instability of DA waves has been discussed. The results exhibit that the plasma system supports both a modulationally unstable domain and a stable domain, which are significantly modified by the related plasma parameters (viz., polarization force parameter $$R$$ , dust charge number ratio $$Z$$ , and superthermal parameters of electrons and ions). Moreover, the instability growth rate is found to be effectively modified by the presence of these parameters. Our results could be applicable for different space and astrophysical plasma environments.