Abstract
The propagation of dust acoustic solitary waves (DASWs) in collisionless and unmagnetized plasma is investigated taking into account the effect of polarization and charge gradient forces. A Korteweg–de Vries equation and its stationary localized solution are obtained. Numerically, it is found that polarization force and charge gradient force have opposite effects on the amplitude and width of DASWs, i.e. polarization effect leads to an increase in the amplitude and a decrease in the width of DASWs, In contrast, the charge gradient effect enhances the amplitude of DASWs and weakens its width.
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