Effect of trapping and reflection on dust acoustic solitary waves in nonthermal opposite polarity dust plasmas

Abstract

The study of resonant wave-particle interactions (WPIs) is crucial in plasma systems where
charged plasma particles interact via long-range electromagnetic. Our research focuses on exploring
the impact of trapping and reflection, along with the superthermality of Kappa resonance electrons
and ions, on the characteristics of dust acoustic waves (DAWs) in opposite polarity dust plasma
(OPDP). Both linear and non-linear analyses were conducted. Two distinct types of dust acoustic
modes, namely fast and slow, have been observed in the linear regime of two different instances of
WPIs. Moving on to the non-linear regime, the Schamel KdV (SKdV) equation has been derived
using the reductive perturbation technique. In both cases, a stationary solution in the form of a
dust acoustic double-layer wave (DADLW) has been successfully obtained. Our findings are highly
relevant to astrophysical plasma environments with non-thermally trapped and reflected particles.